FactoryPro Jet Kit...cure for what ails your carbs!

Discussion in 'Dakar champion (950/990)' started by Gixxer2go, May 16, 2005.

  1. wsmc99

    wsmc99 Been here awhile

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    Jan 9, 2004
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    SD, CA.
    So my understanding is that with the ethanol fuel you need to typically run one size larger jet.
    So to my original question: Did you find 172 leanish with ethanol fuel or non-ethanol?
  2. wsmc99

    wsmc99 Been here awhile

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    SD, CA.
    As a follow up, I dyno'd the 175/178 set up and it was way rich like 12.0 most of the time.
    Dropped to 170/172 - Beauty!
    I have FMF Q's which are pretty restrictive with spark arrestors.
  3. MortimerSickle

    MortimerSickle Semi-Adventurer

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    What reading did you get with that?
  4. mousitsas

    mousitsas Long timer

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    Which needles at what position?
    With 182/180 jets mine was spot on at 13.2 (sea level) on the road at wot with a wideband.
    It sounds as if you have rich needles and lean mains now.
    Also do not trust dynos for afr, they cannot put down the correct load and carbs go richer the greater the load is.
  5. wsmc99

    wsmc99 Been here awhile

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    Stock needles at 2.5, floats at 3.25mm.
    This was a resistance drum dyno. Maybe not 100% accurate afr, but with no wideband this is the way I can confirm direction.
    I don't think my exhaust can move the amount of air others can do to the very restrictive spark arrestors.
    The bike feels really good now though.
    My dyno guy is a good friend and former Pro Race Crewchief, he knows his shit.
  6. wsmc99

    wsmc99 Been here awhile

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    Haven't re-run on the dyno, but my calculations were about .7 afr per jet step so that should put me right around 13.4.
  7. STANIMAL

    STANIMAL SUPPORT THE SECOND

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    Anybody figure anything out for sea level with full TI Akro , intake , FP kit , SAS and canister removed ?
  8. mousitsas

    mousitsas Long timer

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    If by intake you mean something like itg then try
    180 185 mains
    42 pilots
    Fp needle @3
    Floats around 3.5-4mm measured upside down.
    All else stock.
  9. Rcrx21

    Rcrx21 06 KTM 950SM, 04 WR250F

    Joined:
    Dec 4, 2005
    Oddometer:
    599
    Location:
    Collegeville, PA
    2006 950SM
    I installed my factory pro kit 8 months ago. High flow filter, leo vince cans with db killers at sea level SAS and canister removed. It was winter when I did this and noticed the cruising surge once summer arrived. I turned in the fuel mixture screw in from 2.5 to 1.75. everything was good till my low fuel light failed and I ran out of gas(190 miles of mostly commuting) at the end on the following tank of fuel after coming out of the grocery store the bike would start and idle fine but bog when trying to accelerate. I limped it to the gas station and topped it off but no good. After replacing the fuel pump and taking the carbs off twice I finally gave in and took it to the dealer. first they said the battery was out of spec and replaced, no change. tested for compression and spark all good, but no change in bog. they disassembled the carbs and told me it had the wrong jetting that leo vince recommended. I have found out that they ordered new jets. My question is that if the factory pro jets were wrong it wouldn't have been fine for 8 months and then all of a sudden be so wrong that the bike is unridable, would it? MY bill so far is $600 and they haven't fixed anything and I'm somewhat confident that changing the jets isn't going to fix it either just add another $200-$300 to the bill.
    Opinions?

  10. MortimerSickle

    MortimerSickle Semi-Adventurer

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    My bike started bogging badly during acceleration, but still ran fairly well at steady throttle, regardless of speed.

    I found that one of the diaphragms had developed cracks.

    [​IMG]
  11. motoman250f

    motoman250f Been here awhile

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    833
    I agree with your take that the jets shouldn't all of a sudden be a problem. But you cant just do nothing. You have to get on a path to finding out the problem and you are on the path of removing variables. sounds like floats to me or the diaphragms as mentioned but it could be a lot of things. If you can spray bottle gas into the intake while its bogging and it takes off you would at least know its fuel related. I guess its fuel supply,, pump, float stick, plugged filter, etc. Good luck!
  12. Rcrx21

    Rcrx21 06 KTM 950SM, 04 WR250F

    Joined:
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    599
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    Dealer put the stock idle jets in (42) and dropped the mains to 155/160. Problem fixed. I'm still not sure why but so far so good.
    On another note the low fuel light doesn't come on till 160 miles now instead of the 115-120 when I got it.

  13. Rcrx21

    Rcrx21 06 KTM 950SM, 04 WR250F

    Joined:
    Dec 4, 2005
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    599
    Location:
    Collegeville, PA
    The dealer fix lasted 3 weeks. I now have an intermittent popping stumble just as you crack the throttle. I replaced the FP needle with the stock one 3 notch from the top, no change. I replaced the K&N filter with a new stock filter and refitted the snorkel, lasted 1 week and now its back. I don't know what else to try.
  14. Head2Wind

    Head2Wind MotorcycleMayhem

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    1. Make sure the FP is delivering enough fuel flow and correct pressure.
    2. Make sure float needles are not leaking
    3. Make sure float heights are 3-3.5MM
    4. Make sure float bowl vents are 2 hoses, 10 and 11" with longer one on front carb, down through bottom of AirBox, terminate next to starter motor
    5. Remove airfilter bell adaptors (black plastic bits at intake, where velocity stack attach), 3 air jets here.. pull them and clean them, verify going counter clockwise ACV,IAJ,MAJ: 80,50,40 (stock ADV), some of the SE had a 60 @ IAJ. These jets get clogged with oil/dust/goop, especially the MAJ
  15. Rcrx21

    Rcrx21 06 KTM 950SM, 04 WR250F

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    Dec 4, 2005
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    599
    Location:
    Collegeville, PA
    It seems to be rear cylinder involved. When dealer rejetted rear plug was black. I just limped home from work today and the rear header was barely hot. I’m thinking maybe bad needle and seat dumping too much fuel? I looked at the parts breakdown and couldn’t find one listed
  16. Head2Wind

    Head2Wind MotorcycleMayhem

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  17. Rcrx21

    Rcrx21 06 KTM 950SM, 04 WR250F

    Joined:
    Dec 4, 2005
    Oddometer:
    599
    Location:
    Collegeville, PA
    How do I test to see if float needles are leaking?
  18. Rcrx21

    Rcrx21 06 KTM 950SM, 04 WR250F

    Joined:
    Dec 4, 2005
    Oddometer:
    599
    Location:
    Collegeville, PA
    I have to source or make a spark plug socket till I can get the plug out. Assuming it will be black like the last one, is there any chance it might be a bad coil stick? would that be something that would work sometimes and sometimes not? Just getting together a parts order and trying to cover what I might need in one shot.
  19. Rcrx21

    Rcrx21 06 KTM 950SM, 04 WR250F

    Joined:
    Dec 4, 2005
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    599
    Location:
    Collegeville, PA
    This is an 06 supermoto desmogged. the vents come to a T and then the single hose goes outside the airbox
  20. Rcrx21

    Rcrx21 06 KTM 950SM, 04 WR250F

    Joined:
    Dec 4, 2005
    Oddometer:
    599
    Location:
    Collegeville, PA
    Plug as expected
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