DR650 Stalling out on me

Discussion in 'Thumpers' started by packtramp, Mar 23, 2014.

  1. packtramp

    packtramp n00b

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    4
    All,
    I have been digging all over to see how to best tune my carb. Read through MXRob's stuff, Laramie's have a beer and clean your carb post, etc. and I still can't quite figure out my problem. Any suggestions would be greatly appreciated.
    Setup:
    Was running fairly well last year, bike setup over the winter.
    Symptoms:
    Went out to crank it and when choked it will crank after numerous tries. However, if I try to give it throttle it dies. If I remove the choke it dies. The only way to keep it running is to "feather" it back and forth quickly while the choke is on and once it is at higher rpms, it is fine. But if I slow down at a light it will stall unless I feather it. It would seem that it isn't getting enough gas.
    What I have tried:
    I tightened the stenhouse fuel screw all the way closed, then opened it 1.25 turns. Same thing. I opened it up to about 3-4 turns. Same thing.
    Thinking maybe the float was stuck, I removed the carb and it is still really clean. I bought the bike last year and first thing I did was replace many of the o-rings and clean the carb. I have been running higher octane gas and sea foam to try and keep it from gumming up.
    I am at a loss and we are heading on a trip to Tellico this Friday to do a portion of the TAT.

    Thanks again if anyone has anything to try.

    Oh yea..A few other quick questions.

    1) I also found that I have a twin air filter on. Can I use mineral spirits as I don't have any kerosene handy?
    2) My throttle valve slide only has a total of 2 holes, not the 3 as shown in laramie's photos that he said to bore out to 0.125". Do I just make another one?
    3) I was planning on just getting this thing to work again and probably not make the throttle valve slide mod + the space on the jet needle + removing snorkle unless it is a low risk and worthwhile to do while I have the thing apart.

    (I live in the Huntsville, AL area if that matters as far as recommendations for settings on the carb, etc.)

    Thanks!!!
    =Roby=
    #1
  2. rpet

    rpet Awesometown

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    Replace pilot jet with oem. Check float height.
    #2
  3. Sandbogg

    Sandbogg Been here awhile

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    Clogged pilot jet. Take out the pilot jet and run a wire pulled from a stainless steel wire brush through all the holes. It should run like new after that. Might as well clean the main jet while you are at it.
    #3
  4. oldirtyrider

    oldirtyrider Long timer

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    Every everything I had this problem with be it a car bike or otherwise the solution is always get it running and quickly run the throttle back and fourth like you're doing to achieve RPMs and then everytime you get the RPMs up try to hold the throttle longer and longer and eventually it will blow the obstruction through itself. I just did this with a car the other day . took me about a half hour but I eventually got the RPMs to hold with throttle applied steadily now the car runs fine.
    #4
  5. Foot dragger

    Foot dragger singletracker

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    Try to abstain from reading internet tuning tips and it will run better once you clean the pilot,drilling of slides,hacking up the airbox,changing needles and other jets isnt necessary to have it run just fine and can all be regretted later,sometimes.
    #5
  6. Foot dragger

    Foot dragger singletracker

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    R U serious?

    That's been called a Hispanic tuneup on old previous PC days,there is no pressure at the pilot or main jet that will "blow" an obstruction out of it,you may run dirty gas out of the carb that way maybe but wont clean jets.

    Ive heard kids doing this with bikes and cars but its a wishful thinking thing.
    #6
  7. slacker83

    slacker83 Adventurer

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    This^, I just went through the same symptoms you had and cleaned the carb and cleaned the jets and it is running great now.
    #7
  8. cyberdos

    cyberdos Easy Bonus Loop

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    How do you know the OP isn't Hispanic? It may work.
    #8
  9. oldirtyrider

    oldirtyrider Long timer

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    Well it worked with a car thatd been sitting for a couple months having the same issue the other day . I've done it on COUNTLESS engines with 100% success rate without ever disassembling a carb so what you call wishful thinking I call reality .
    #9
  10. vintagespeed

    vintagespeed fNg

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    plugged pilot. as i'm sure you've been told. :D
    #10
  11. vintagespeed

    vintagespeed fNg

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    :rofl:rofl:1drink:rofl:rofl:ear:rofl
    #11
  12. rpet

    rpet Awesometown

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    Oem pilots are cheap. Buy 2 or 3 and don't bother poking wire through it, IMHO.
    #12
  13. exoff-roadgoat

    exoff-roadgoat Will ride for food

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    Mineral spirits? Yes.
    #13
  14. acesandeights

    acesandeights Asperger

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    #14
  15. Kommando

    Kommando Long timer

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    What's the saying that somebody here (ER) has in their sig?

    "If it's stupid and it works, it isn't stupid."

    I don't know that it would hurt anything to try it, and you shouldn't knock something like that until you try it.
    #15
  16. packtramp

    packtramp n00b

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    Alright...So it was that pilot jet or whatever. Like everyone advised.
    I took out the carb, dumped it in some carb gunk cleaner for a few hours. Then used the spray carb cleaner on everything also so i could spray out where the jets sat. Put it all back together and it is running like a champ. Nothing looked worn out, so I just cleaned and replaced.

    I decided to save the mods for after my trip. I am not that experienced of a rider so I probably wouldn't notice the added gains yet anyway, plus, if I screwed up I am out of luck. So, it is back in (minus the snorkel) and running great.

    Thanks again for a great forum with great members!!! What a $$ saver and good to know info!!
    #16
  17. vintagespeed

    vintagespeed fNg

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    ...so just ignore all that mechanical mumbo jumbo and years of experience and just go with voodoo & witchcraft?

    :huh





    ok! sounds good to me!








    are you an engineer by chance? :lol3
    #17
  18. oldirtyrider

    oldirtyrider Long timer

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    No , it's definitely dumb. Doesn't matter that it works . If people like taking carbs apart for nothing than who be I to tell them any different. Every motor with that problem I could get started I cleared using that method and thats cars trucks motorcycles weedwackers leaf blowers lol . But At the end of the day I suppose atleast you gain experience doing it the hard way .
    #18
  19. vintagespeed

    vintagespeed fNg

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    you didn't follow the advice and remove the jets to clean them, and then you dunked the carb with all its rubber bits still attached in a can of caustic solution?

    very interesting..
    #19
  20. Foot dragger

    Foot dragger singletracker

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    Have you ever seen a plugged carburetor jet? Its a piece of brass with a small hole in it and once they're plugged no amount of running the engine is going to get that plug out. Theres no pressure in a carb to blow the dried up crap out of the jet. What your doing is slowly running dirty gas out of a carb by running it until it works.

    If jets could be cleaned by revving the engine a long time everybody would do it.
    #20