KTM 990 Cam Timing Specs

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by BillyD, Jan 19, 2011.

  1. BillyD

    BillyD Been here awhile

    Joined:
    Jun 17, 2007
    Oddometer:
    648
    Location:
    San Mateo County Coast, CA
    I did a search and reviewed the service CD, but to no avail...

    Can anyone point me to cam timing specs for the 990 Adventure?

    Specifically, I'm looking for timing clearance and open/close degrees. Lift would be nice too, but not required.

    Thanks.

    Bill
    #1
  2. tahoeacr

    tahoeacr Long timer

    Joined:
    Jan 7, 2007
    Oddometer:
    2,223
    Location:
    Lake Tahoe
    Good luck on that. I couldn't get that info out of KTM. My Yamaha manuels have it for them but try to get anything out of KTM is impossible. I finally measured it but I can't find were I wrote it down. My bad memory remembers about .333 intake lift and duration was less than 212. Exhaust duration something like 242. If you need this you probably need exact figures so this isn't any good for ya. Found the specs on the cam I'm running now:evil. Lot of room for more lift.
    #2
  3. BillyD

    BillyD Been here awhile

    Joined:
    Jun 17, 2007
    Oddometer:
    648
    Location:
    San Mateo County Coast, CA
    Hmmmm, if full timing specs aren't readily available, would you happen to remember where the lobe centers should be set?
    #3
  4. cpmodem

    cpmodem Orange Caveman

    Joined:
    Nov 29, 2004
    Oddometer:
    7,103
    Location:
    masa yee yah tee 59° 14' 9" N / 135° 26' 42" W
    Pretty easy to check next time you do a valve check.
    #4
  5. nomad guy

    nomad guy A legal alien

    Joined:
    Oct 5, 2008
    Oddometer:
    914
    Location:
    Stranded in Berkeley, CA
    its good to see you are back on this forum, haven't seen your posts for very long time :wave
    #5
  6. BillyD

    BillyD Been here awhile

    Joined:
    Jun 17, 2007
    Oddometer:
    648
    Location:
    San Mateo County Coast, CA
    True, but that alone will only tell me what they are which might not necessarily be what they should be...

    This falls into the "Trust, but Verify" catagory.
    #6
  7. BillyD

    BillyD Been here awhile

    Joined:
    Jun 17, 2007
    Oddometer:
    648
    Location:
    San Mateo County Coast, CA
    Interesting how only the rear intake cam has a blue dot. All other cams have an orange dot... I wonder why this is so?

    [​IMG]
    Front Exhaust


    [​IMG]
    Front Intake


    [​IMG]
    Rear Intake

    [​IMG]
    Rear Exhaust
    #7
  8. Head2Wind

    Head2Wind MotorcycleMayhem

    Joined:
    Mar 13, 2006
    Oddometer:
    2,662
    Location:
    NorthWet Washington
    QC shift markings?

    In general we know that 990 SD cams will fit and run in the 990 ADV heads. I think that there are several 950 engines running 990 SD cams too (flanny i think is running SD cams in his 950 ADV)
    #8
  9. BillyD

    BillyD Been here awhile

    Joined:
    Jun 17, 2007
    Oddometer:
    648
    Location:
    San Mateo County Coast, CA
    Maybe I have one cam from each: 950, 990A, 990SD, and RC8. :huh
    #9
  10. K2m

    K2m ....58....

    Joined:
    Feb 27, 2005
    Oddometer:
    2,238
    Location:
    Sydney Australia
    I'm running 07 SD cams in my 04'S'

    Also 39 FCR's with TPS, and copy's of Africa Queen extractors.
    #10
  11. nomad guy

    nomad guy A legal alien

    Joined:
    Oct 5, 2008
    Oddometer:
    914
    Location:
    Stranded in Berkeley, CA
    does anyone have the the sd cams on a 950 with the regular carbs ?.
    btw i think the sd cams are the same cams as all the newer 990s.
    #11
  12. BillyD

    BillyD Been here awhile

    Joined:
    Jun 17, 2007
    Oddometer:
    648
    Location:
    San Mateo County Coast, CA
    What do the KTM 990 Adventure, a Honda 3-wheeler from the late 1980’s and the lowly stock Kawasaki KLR 650 all have in common?

    They all use almost exactly the same cam profiles…

    <table class="MsoNormalTable" style="width: 350pt; margin-left: 4.65pt; border-collapse: collapse;" border="0" cellpadding="0" cellspacing="0" width="467"> <tbody><tr style="height: 24.75pt;"> <td style="width: 49.3pt; padding: 0in 5.4pt; height: 24.75pt;" nowrap="nowrap" valign="bottom" width="66">
    </td> <td style="width: 70pt; padding: 0in 5.4pt; height: 24.75pt;" nowrap="nowrap" valign="bottom" width="93">
    CAM LIFT (in)
    </td> <td style="width: 54.3pt; padding: 0in 5.4pt; height: 24.75pt;" valign="bottom" width="72">
    DURATION AT .040"
    </td> <td style="width: 44.4pt; padding: 0in 5.4pt; height: 24.75pt;" valign="bottom" width="59">
    LOBE CENTER
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 24.75pt;" nowrap="nowrap" valign="bottom" width="25">
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 24.75pt;" nowrap="nowrap" valign="bottom" width="44">
    OPEN
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 24.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 24.75pt;" nowrap="nowrap" valign="bottom" width="51">
    CLOSE
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 24.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> </tr> <tr style="height: 15.75pt;"> <td colspan="4" style="width: 218pt; padding: 0in 5.4pt; height: 15.75pt;" nowrap="nowrap" valign="bottom" width="291"> STOCK KTM 990 ADVENTURE CAMS
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 15.75pt;" nowrap="nowrap" valign="bottom" width="25">
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 15.75pt;" nowrap="nowrap" valign="bottom" width="44">
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 15.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 15.75pt;" nowrap="nowrap" valign="bottom" width="51">
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 15.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> </tr> <tr style="height: 12.75pt;"> <td style="width: 49.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="66">
    INTAKE
    </td> <td style="width: 70pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="93">
    0.354
    </td> <td style="width: 54.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="72">
    224
    </td> <td style="width: 44.4pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="59">
    103
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="25">
    atc
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="44">
    9
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    btc
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="51"> 35
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    abc
    </td> </tr> <tr style="height: 12.75pt;"> <td style="width: 49.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="66">
    EXHAUST
    </td> <td style="width: 70pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="93">
    0.354
    </td> <td style="width: 54.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="72">
    223
    </td> <td style="width: 44.4pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="59">
    101
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="25">
    btc
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="44">
    32
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    bbc
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="51">
    11
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    atc
    </td> </tr> <tr style="height: 12.75pt;"> <td style="width: 49.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="66">
    </td> <td style="width: 70pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="93">
    </td> <td style="width: 54.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="72">
    </td> <td style="width: 44.4pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="59">
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="25">
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="44">
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="51">
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> </tr> <tr style="height: 12.75pt;"> <td colspan="4" style="width: 218pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="291"> HONDA ATC-200X, TRX-200SX (1986&#8212;1988)
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="25">
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="44">
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="51">
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> </tr> <tr style="height: 12.75pt;"> <td style="width: 49.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="66">
    INTAKE
    </td> <td style="width: 70pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="93">
    0.355
    </td> <td style="width: 54.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="72">
    222
    </td> <td style="width: 44.4pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="59">
    106
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="25">
    atc
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="44">
    5
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    btc
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="51">
    37
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    abc
    </td> </tr> <tr style="height: 12.75pt;"> <td style="width: 49.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="66">
    EXHAUST
    </td> <td style="width: 70pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="93">
    0.355
    </td> <td style="width: 54.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="72">
    222
    </td> <td style="width: 44.4pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="59">
    106
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="25">
    btc
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="44">
    37
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    bbc
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="51">
    5
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    atc
    </td> </tr> <tr style="height: 12.75pt;"> <td style="width: 49.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="66">
    </td> <td style="width: 70pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="93">
    </td> <td style="width: 54.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="72">
    </td> <td style="width: 44.4pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="59">
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="25">
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="44">
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="51">
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> </tr> <tr style="height: 12.75pt;"> <td colspan="8" style="width: 329pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="439"> KAWASAKI KLR-600 single (1984&#8212;1986) and KLR-650 (1987&#8212;1992)
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> </tr> <tr style="height: 12.75pt;"> <td style="width: 49.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="66">
    INTAKE
    </td> <td style="width: 70pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="93">
    0.345
    </td> <td style="width: 54.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="72">
    227
    </td> <td style="width: 44.4pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="59">
    ?
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="25">
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="44">
    ?
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="51">
    ?
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> </tr> <tr style="height: 12.75pt;"> <td style="width: 49.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="66">
    EXHAUST
    </td> <td style="width: 70pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="93">
    0.355
    </td> <td style="width: 54.3pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="72">
    222
    </td> <td style="width: 44.4pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="59">
    ?
    </td> <td style="width: 19pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="25">
    </td> <td style="width: 33pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="44">
    ?
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> <td style="width: 38pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="51">
    ?
    </td> <td style="width: 21pt; padding: 0in 5.4pt; height: 12.75pt;" nowrap="nowrap" valign="bottom" width="28">
    </td> </tr> </tbody></table> Source: MegaCycle Cams and Poster measurements.

    In other words, the cams in the 990 Adventure are very mild in almost every aspect. Compared to cams used in many motorcycles today, the 990 Adventure cams have short duration, little overlap and do not much valve lift. The design is even more pedestrian than those used in mid-1980&#8217;s universal Japanese motorcycles.

    Procedure

    I measured cam timing at .040&#8221; (1mm) valve lift since this is what MegaCycle Cams and most Japanese motorcycle manufacturers use as their standards.

    [​IMG]

    Since I didn&#8217;t have the right shims to set lash to zero, I measured timing and lift using running lash and with lash set to .040&#8221;. When using running lash, I deducted the running lash from .040" to obtain the correct checking lift. For example, if the running lash was .006", I checked opening and closing points at .034" valve lift (.040" minus .006" = .034"). To double check the results, I then set the lash as close as possible to .040&#8221; and checked opening and closing points just as the lobe contacted the valve bucket.

    To get consistent readings, I had to remove three cams while measuring one. With a total of only eight lobes on four cams for two cylinders, valve spring pressure causes the motor to suddenly rotate forward each time any lobe went over center and start to close.

    Also, to get consistent closing point readings, I had to temporarily replace the spring-loaded cam chain tensioners with solid pieces snugged down to take up any cam timing chain slop. The force exerted by the cam lobe as the closing point would over power the spring-loaded tensioners and induce as much as 4 degrees crank variation.

    Conclusions

    By all measures, the stock KTM 990 Adventure cams are very mild. They are low lift, short duration cams. Other motorbikes that have very similar cam specs the lowly KAWASAKI KLR-600 single (1984&#8212;1986) and KLR-650 (1987&#8212;1992) and the CPSA-banned HONDA ATC-200X, TRX-200SX (1986&#8212;1988).

    [​IMG]
    Figure 1. Psst, Hey Buddy, Wanna Race?

    BTW, these cam specs are also very close to another off-road monster, the Honda XR200.
    #12
  13. Head2Wind

    Head2Wind MotorcycleMayhem

    Joined:
    Mar 13, 2006
    Oddometer:
    2,662
    Location:
    NorthWet Washington
    Excellent work BillyD! Now I need to get busy with the 950 measuring. I wonder if they are going to be any different.... My brother seems to think that the EFI designed cams are going to be more mild and different overlap (less) that a carb'd bike. Time will tell on this one and who owes who a beer.

    Nice chrome header on that banned three wheeler!
    #13
  14. cyborg

    cyborg Potius Sero Quam Numquam

    Joined:
    Jun 7, 2004
    Oddometer:
    5,415
    Location:
    Pacific NorthWet
    Hey Bill, my stock 990 cams are paperweights! :lol3 Good sleuthing :thumb

    Love those SD cams. :beer
    #14
  15. Head2Wind

    Head2Wind MotorcycleMayhem

    Joined:
    Mar 13, 2006
    Oddometer:
    2,662
    Location:
    NorthWet Washington
    Hey Clif, did you replace the buckets at the same time as putting in the SD cams or leave'm and run it?
    #15
  16. tahoeacr

    tahoeacr Long timer

    Joined:
    Jan 7, 2007
    Oddometer:
    2,223
    Location:
    Lake Tahoe
    How about Intake .452 lift w/duration 254
    Exhaust .435 lift w/duration 250
    #16
  17. Geek

    Geek oot & aboot

    Joined:
    Jun 8, 2003
    Oddometer:
    33,294
    Location:
    8000ft.
    forgive the stupid question but what's the pink stuff?

    [​IMG]
    #17
  18. Head2Wind

    Head2Wind MotorcycleMayhem

    Joined:
    Mar 13, 2006
    Oddometer:
    2,662
    Location:
    NorthWet Washington
    assembly lube. Im not sure what brand BillyD uses but I use Redline, post valve adjust.

    #18
  19. BillyD

    BillyD Been here awhile

    Joined:
    Jun 17, 2007
    Oddometer:
    648
    Location:
    San Mateo County Coast, CA
    Now that's more like it....
    At what clearance? Timing?
    #19
  20. tahoeacr

    tahoeacr Long timer

    Joined:
    Jan 7, 2007
    Oddometer:
    2,223
    Location:
    Lake Tahoe
    Webb cams builds them for someone racing in Europe. They couldn't tell me if it would clear the pistons without valve relief. Then I bought a Husaberg and lost interest in my 990:cry.
    #20