DR350 Thread

Discussion in 'Thumpers' started by leonphelps, May 16, 2007.

  1. Frankdozer

    Frankdozer Adventurer

    Joined:
    Dec 6, 2012
    Oddometer:
    21
    Location:
    Bridgton, Maine
    ! have a 1990 Suzuki DR350S dualsport and I am about to change the engine oil and filter. The bike only has under 1500 miles on it. I normally use 10W-40 regular oil and am considering changing to 10W-40 synthetic oil. I've heard both pros and cons about synthetic. What do you guys think? Thanks, Frank
  2. Bonerov

    Bonerov Damned dirty ape

    Joined:
    Nov 25, 2008
    Oddometer:
    590
    Location:
    San Francisco Bay Area
    There are about a billion threads about oil. My two cents: for this bike I run 15-40 Delo (dino oil). Works like a champ.
  3. jeep8

    jeep8 Been here awhile

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    Feb 19, 2009
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    Florence, Al
    Why not use Suzuki 10w40, that is what i use.
  4. jmderyke

    jmderyke Miner

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    Dec 19, 2012
    Oddometer:
    43
    Location:
    State of Jefferson
    Lucas motorcycle 10w 40 syn blend has worked good in my street bikes, and you can get it at just about any auto parts place and isnt crazy expensive. Ive used royal purple motorcycle oil and it will lowered engine temp very slightly but I noticed the clutch needed to be adjusted a few days after putting it in and is expensive.
    I believe the syn blends are the way to go just my two cents.
  5. VooDooDaddy

    VooDooDaddy Been here awhile

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    Mar 15, 2009
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    SW Iowa
    Hey Frank,

    Don't over-think the oil issue. Use any high-quality, name-brand 10w-40 dino oil. The bike doesn't hold much oil, so change it often (every 1,000) miles or so, and the engine in your bike will outlast your ownership of the bike itself.
  6. jmderyke

    jmderyke Miner

    Joined:
    Dec 19, 2012
    Oddometer:
    43
    Location:
    State of Jefferson
    Im getting my parts list going to bring my 91 350s back to life and since I havent riden it yet I want to know whats the best gearing for highway and dirt roads mix? And oil cooler Ive seen some stock ones but anyone fabricate a universal or a donor from other bikes onto the dr?Ive seen the jagg one on a build here but thats about it any others :1drink
  7. plugeye

    plugeye unforgiven

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    May 11, 2007
    Oddometer:
    4,897
    Location:
    Garland, Texas
    cant have both without swapping CS sprockets
    16t for road, 14t for dirt?
  8. DrKrisz

    DrKrisz n00b

    Joined:
    Nov 1, 2012
    Oddometer:
    4
    Location:
    Hungary
    Helló Bikers!
    I m new here.I have a Dr350 Se.
    (Sorry,I learn english....I have basic english....)

    [​IMG]
  9. 2old2Bbold

    2old2Bbold was 2bold2getold

    Joined:
    Dec 10, 2011
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    2,555
    Location:
    DFW TX
    From an old post ... http://www.advrider.com/forums/showpost.php?p=19671242&postcount=13123
  10. 2old2Bbold

    2old2Bbold was 2bold2getold

    Joined:
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    Oddometer:
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    DFW TX
    Welcome DrKrisz, What part of the world are you from? Do not worry about english. Some of us in english speaking countries are not very good at it either. If we do not understand, we will ask you to explain. Welcome and ride safe.:D
  11. walkbar

    walkbar n00b

    Joined:
    Feb 25, 2010
    Oddometer:
    8
    Location:
    UK
    I THOUGHT that adding gas and re-routing the fuel pipes had done the trick but I had it running in the garage after changing the oil today and it cut out again and wouldn't start easily.

    Took the fuel cap off and it started!......got me wondering how Acerbis tanks vent...it's got a plastic screw on cap with a valve on the end of 2 inches of plastic pipe.

    Took a closer look at the valve and it's got a little arrow pointing up (to release excess pressure?)

    Pulled the valve out and turned it over so the arrow points down.

    At the moment I'm thinking that the valve ISN'T to release pressure....It's the VENT and it let's air in so you don't get a vacuum as you use fuel and it stops fuel coming out when you have a lay down.

    It all seems so f**king obvious now....:eek1

    We'll see......:ear......I must change these drugs...:huh
  12. dav_dman

    dav_dman Been here awhile

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    louisville ky/southern indiana
    pretty sure my tank vent lines on other bikes are not one way valves. If they were I'd agree with you...fuel pressure from a hot tank is not going to hurt anything, but lack of suction will leave u stranded.
  13. Canadian FJR

    Canadian FJR Been here awhile

    Joined:
    Nov 9, 2008
    Oddometer:
    129
    Location:
    Nova Scotia, Canada
    1999 DR-350 SE

    Just checked the valves and they are as follows;

    Intake .003 / .004
    Exhaust .006 / .006 (both are a tight .006)

    I know that a loose valve is better than a tight valve and I'm thinking about leaving them as is. Any thoughts?

    EDIT: Found the notes on the '99 model - Intake are now both at .003 and the exhaust are at .008

    Canadian FJR
  14. MiteyF

    MiteyF Long timer

    Joined:
    Jul 23, 2010
    Oddometer:
    2,117
    Location:
    Michigan... temporarily
    Well I sold my '93 S about a year and a half ago (after I bought my Wee) but wanted something to go explore the local FS roads. I didn't want to get an extra set of wheels for the SM so I found another DR on CL, this time a '95 SE.

    She needed a valve adjustment and fresh gas (read; running poorly = cheap), and she needs tires, but she runs great after an hour or so of tinkering. Damn these are good bikes!

    [​IMG]

    [​IMG]
  15. plugeye

    plugeye unforgiven

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    Location:
    Garland, Texas
    with a vacuum petcock the diaphram can vent when its not supposed to
  16. philp38

    philp38 Long timer

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    Mar 25, 2006
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    3,257
    Location:
    Decatur TN
    Noob DR350 Question.... Are you short shifting your 350 or running up to let's say 6 or 7k then shifting? I seem to like shifting at around 3 or 4k. Having never owned one before and wondering if high RPM is a good thing or not for these bikes? I don't want to blow the damn thing up...I kinda like it..
  17. MiteyF

    MiteyF Long timer

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    Location:
    Michigan... temporarily
    Depending on conditions, I will shift anywhere between 3k and redline. These engines are pretty much bulletproof (why I like 'em) and so long as you do your maintenance, redline won't hurt them.
  18. markk900

    markk900 Been here awhile

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    Oct 13, 2012
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    660
    Location:
    Ontario, Canada
    Two things - my (admitted very old) Acerbis tank doesn't have any valves on the vent - I just run a plastic hose from the cap over the bars and down again.....I realize the valve might keep gas from spilling if you dump but I've fallen a few times (ha!) over the years and never lost enough out the vent that it mattered - I'd get rid of the valve altogether and go without.

    Second - obviously the drugs are working well - why change? :)
  19. walkbar

    walkbar n00b

    Joined:
    Feb 25, 2010
    Oddometer:
    8
    Location:
    UK
    Haha....who needs shrinks!

    Yeah...I've seen a few now with just a long tube....takes an confusion away.....as well as pranksters!:D

    Just have to find the headlight adjuster and she's ready to retest bar a couple of little bits arriving in the post.
  20. TopDeadCenter

    TopDeadCenter Been here awhile

    Joined:
    Dec 7, 2009
    Oddometer:
    385
    Location:
    NE of New Paris, WI
    OK. Finally got some time to work on the bike this morning. It has been very much screwed with by previous oners. Missing engine mount bolts, loose fasteners, and missing crap. Looks as if there was a top end replacement with an earlier dirt model head without the auto decomp. Reason I say this is there is the decomp mechanism on the head and the head has factory black paint on it. Every other 94 se I have seen is all silver.

    [​IMG]

    So my next question is: Do I need to run a decomp lever with this head? Will I mess things up if I test run it without it? I am close to firing it up for the first time and just need to fit the carb fuel/vent lines and the tank.


    BTW: I have violated my rule of never buying a non running bike, but I somehow felt I needed to resque this one

    TDC