Starts, Then Won't Stay Running (Sort Of)
Close
    
    
Page 1 of 3 123 LastLast
Results 1 to 10 of 21
Like Tree30Likes

Thread: Starts, Then Won't Stay Running (Sort Of)

  1. #1
    Member Oldad's Avatar
    Join Date
    Apr 2013
    Location
    Shawnee National Forest (Harrisburg), IL
    Posts
    85
    This seems to be a familiar problem on the forum, but after searching numerous posting here, I have yet to find one that offered a solution that solved my problem. My appologies if I missed one.



    Here's the deal. Bought an 05 dub about two weeks ago. It had sat through at least part of last winter. Barely got it started at the seller's place but bought it anyway. (Not the best decision.)



    Anyway, once home, got it to run but mostly with the choke on, and still had trouble keeping it running. Assumed carb dirty, so jerked it off, dismantled, cleaned with carb cleaner and compressed air, reassembled with original parts, installed, ran better, but still had trouble keeping it running. Actually drove it about four miles here around the farm. I also drained all the old fuel and replaced with fresh and installed a new spark plug.



    Okay, today I pull the carb off again and rebuilt with an aftermarket carb kit purchased from the local Yamaha dealer. Result: engine starts and idles fine, but when the throttle is opened, it dies as if it is running out of fuel. This is pretty much the way it has always been dying.



    At times you can start, open the throttle and it rev's up, but after less than a minute, sometimes seconds, it sputters and dies, as if running out of fuel. Yes, I've check the fuel flow from the tank.



    I'm beginning to wonder if my problems isn't fuel.



    Could it be that the ignition system is capable of maintaining a spark at low rpm's but breaks down as soon as engine speed increases? Of course, I've run across references here on the forum to problems with older CDI units, but none seems to match my problem exactly.



    I did take a look at the coil, testing it in accordance with repair manual. Its resistance on primary and secondary coil did not match exactly the manual's specs, but how far off spec do you have to be to be a bad coil? Primary coil resistance measured 0.5 ohms vs. 0.18-0.28 spec, and secondary coil measured 17.3 ohms vs. 6.32-9.48 spec.



    Since it's not exactly in spec, I plan to replace the coil, but may try testing with another multi tester first.



    If that doesn't work, I guess I'll look at the CDI unit. How to do that, though, I'm not really sure.



    Does any of this make sense? Am I going down the right path? All suggestions would be greatly appreciated.



    I hate the thought of taking the dub to the dealer for service, with all of the vast knowledge here on this site.



    I got the TW to ride here in the Shawnee National Forest, but so far, all I've done is work on the darn thing. Help! Please!
    jtomelliott49 likes this.

  2. #2
    Senior Member FortPayne's Avatar
    Join Date
    Nov 2011
    Location
    Alabama
    Posts
    326
    It could be the cdi but pretty unlikely. Bike's just not that old.



    It screams carb problem doesn't it? So...



    Float getting stuck or adjusted wrong? Lets in plenty of fuel for idle but when it needs more there just isn't any there.

    Check the carb boots for air leaks. Lean condition would require choke yada yada.

    Next, verify the carb rebuild kit was correct. Many times on here rebuild kits cause problems, wrong year or jet size.

    The vent tubes aren't clogged are they? Heck new ones might not have them for all I know.

    Crank it up, let it warm up 3 or 4 minutes. Can you rev it? How about if you baby it and increase idle slowly? Back off before it dies and try again.



    Your coil sounds fine to me. Mine was also out of spec but fully functional.

    Before I would buy a new cdi I would swap one out if I had access to see if that clears it up. They're expensive and ya can't really test them to see if they're bad due to the nature of their malfunction.
    jtomelliott49, Tweaker and Fred like this.
    Tenaciously Deviant Unwittingly Brilliant

  3. #3
    Senior Member assquatch20's Avatar
    Join Date
    Jul 2010
    Location
    Tennessee
    Posts
    1,285
    I'll second float adjustment, improper jets from the dealer, and clogged venting. Try it with the gas cap off as well, as that's a vent that can get clogged. If it's a Cali model the tank vents differently, but the procedure to check is the same.
    Fred and jtomelliott49 like this.

  4. Remove Advertisements
    TW200Forum.com
    Advertisements
     

  5. #4
    rbm
    rbm is offline
    Senior Member rbm's Avatar
    Join Date
    Jan 2011
    Posts
    4,300
    Did you remove or replace the pilot jet? Mine acted the same way you're describing, the pilot jet was partially blocked.
    goldenhtr and jtomelliott49 like this.

  6. #5
    Member Oldad's Avatar
    Join Date
    Apr 2013
    Location
    Shawnee National Forest (Harrisburg), IL
    Posts
    85
    Quote Originally Posted by rbm View Post
    Did you remove or replace the pilot jet? Mine acted the same way you're describing, the pilot jet was partially blocked.


    Yes, the kit did include a new pilot jet. And it had a new air idle adjuster which I changed out too, after pulling the aluminum cap off the old one. I noted that the original adjuster screw was only backed out 1 1/4 turns, but I set the new one at 2 1/2 turns per recommendations on this forum.



    If anything the float was set slightly low. But since the carb is inverted when this measurement is taken, would that not result in a slightly fuller bowl?



    I'll check for venting as well, but it seems like it would take quite a while to create a vacuum in the fuel tank, for no more fuel is being drawn.



    It's raining all day here so I might as well go back into the carb again today. I'll try to check out all your suggestions.



    Thanks so far.
    jtomelliott49 likes this.

  7. #6
    Senior Member Leisure Time Larry's Avatar
    Join Date
    Jul 2012
    Location
    Wet-ern Washington
    Posts
    1,404
    Did you change out the gas? If it's over a month old, change it out and use some fresh stuff. Also, make sure you installed all of the carb parts properly. I lost the silvery nozzle that goes under the main jet holder once. Ran fine at idle using the pilot jet, but once I gave it throttle, it ran like crap and died.
    jtomelliott49 likes this.
    - Leisure Time Larry -
    Hidden Content
    Hidden Content

    2004 TW200, 13-54 gearing, Shinko 241, Race Tech Emulators, Procycle front springs, Works Performance rear shock, Emgo handguards, Luckybike mirror risers, Ken Sean DS foldable mirrors, 30mm Tusk bar risers, Seat Concepts, Kick Starter kit, Plasti-dip camo coat, Cycle Pumps, Ricochet Skid Plate, flood and spot LED pod lights, Sena, Garmin etrex 20 GPS, IMS 313114folding shifter

  8. #7
    Member Oldad's Avatar
    Join Date
    Apr 2013
    Location
    Shawnee National Forest (Harrisburg), IL
    Posts
    85
    lrppcer,



    You nailed it. I didn't leave the silvery main jet nozzle out. I just put it in the wrong place.



    Went ahead and adjusted the float and put the nozzle in right. Fired right up. Runs like a champ.



    Thanks to everyone that steered me back on course. You guys are great!



    Jeff Jones

    Shawnee National Forest, IL
    jtomelliott49 and Fred like this.

  9. #8
    Member Oldad's Avatar
    Join Date
    Apr 2013
    Location
    Shawnee National Forest (Harrisburg), IL
    Posts
    85
    Actually, I was a bit premature on that celebration. Idle problems persisted, but finally resolved yesterday.



    FINALLY. It's fixed. Hallelujah! After removing, dismantling, reassembling, installing the carb four more time last evening, I think I figured it out.



    Assuming I still had a passage still blocked on the carb somewhere, I was going to tear it down again for another cleaning and inspection, but at the last minute I thought I ought to recheck the float level. I'd checked it before with the clear plastic tube connected to the float drain, but had considered that my symptoms might be caused by low fuel level in the bowl. Hooked up the tube again. Opened the drain screw and low and behold the fuel level came up about 8mm lower than spec.



    It took four tries but finally got the float set right, or at least right enough. Each time I'd try to set the float height with a caliper, then install and check again with the clear tube method. It's not as easy as it seems it should be. I'm still a bit confused by the instructions regarding when the "float needle contacts the seat but does not compress the needle spring". You definitely cannot just turn the carb upside down and measure. The needle spring will compress for sure. I had to tilt the carb more than 45 degrees for the needle to contact the seat and still not compress the needle spring.



    Anyway, since then, she fires up, idles smooth and seems to have more power at all speeds.



    I know this account does not lend great insight into carb adjustment, thought I'd pass it on anyway, considering the number of carb tuning inquiries posted here.



    I guess my advice is: Be thorough. Check everything.



    Oh, and one more revelation. If you put in a new idle air adjuster, be sure to use the right size o-ring ahead of the steel washer in front of the spring.
    jtomelliott49, Fred and Tweaker like this.

  10. #9
    Junior Member TomGleinser's Avatar
    Join Date
    Sep 2016
    Posts
    2
    I had the same problems exactly after a few months of light use. I thought the carb might be gummed up with Ethanol so bought a new carb since the bowl is not removable. It is riveted together. I'll have to drill out rivets, I guess. The new carb ran fine for about 20 minutes and then went back to idle only with choked fully. Push in the choke it dies, give it any gas, it dies.

    Thanks for any help.
    Tom
    jtomelliott49 and littletommy like this.

  11. #10
    Senior Member Tweaker's Avatar
    Join Date
    Dec 2015
    Location
    San Diego
    Posts
    1,857
    Tom your problem sounds like dirt or junk getting into the carb. Did you drain and flush your tank? Do you have a fuel filter between your tank and carb? I ordered some 90 degree filters to put on my bikes because I found a small particle in my pilot jet along with bad running from old gas.

    Quote Originally Posted by TomGleinser View Post
    I had the same problems exactly after a few months of light use. I thought the carb might be gummed up with Ethanol so bought a new carb since the bowl is not removable. It is riveted together. I'll have to drill out rivets, I guess. The new carb ran fine for about 20 minutes and then went back to idle only with choked fully. Push in the choke it dies, give it any gas, it dies.

    Thanks for any help.
    Tom
    ”Everything You Know is Wrong”

    ” How Can You Be in Two Places at Once When You Are Nowhere at All?”




    Twin 2014 TW200's made side by side on the assembly line, Moose rear racks, Protaper ATV high bars, DG oval pipes, kick starters, rejetted carbs, 130 main jets, 2 -3 -.020 shims on the needles and @ 2 1/2 turns on the pilot screw, #34 pilot jets, Acerbis hand guards, Shinko 241 front tires, modified Krator foot pegs, 14-55t sprockets, Ricochet skid plates and 90 degree fuel filters.

Page 1 of 3 123 LastLast

Sponosred Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. Place to stay in Tellico Plains
    By Xracer in forum Trails, Off-road, and Adventure Riding
    Replies: 2
    Last Post: 05-17-2013, 05:56 AM
  2. Stuff it sort of twice
    By Stromper in forum General Discussion
    Replies: 9
    Last Post: 03-26-2012, 01:01 AM
  3. Newbie here (sort 0f)
    By jrdavis in forum General Discussion
    Replies: 8
    Last Post: 07-18-2011, 07:39 PM
  4. Hello Newbie here sort of
    By RisingSun in forum General Discussion
    Replies: 2
    Last Post: 06-10-2011, 05:53 PM
  5. Stay-n-Ride Palm Springs area Nov. 19,20,21
    By JS5owner in forum Trails, Off-road, and Adventure Riding
    Replies: 27
    Last Post: 11-21-2010, 11:54 AM

Search tags for this page

parts break down of tw200 carberator
,

trail wagon tw200

,
trail wagone tw200 engine
,
tw 250 wont hardly run
,

tw200 starts then dies

,

tw200 wont idle

,
tw200 wont run for more than 30 seconds
,

tw200 wont stay running

,
why does my yamaha tw200 die out when throttle is quickly opened at idle
,

yamaha tw 200 wont idle

,

yamaha tw200 hard to start and idle

,
yamaha tw200 starts idles but doesnt rev
Click on a term to search for related topics.