fed up with no good inforamtion


35 replies to this topic
  • ganja772006

Posted January 27, 2010 - 01:17 PM

#1

got 2000 yahama yz426 with white bros series exhaust.....valves and carb rejetted by dealership....it runs good with choke on but when its off it dies...got a lil bog and hestation to it ....bascailly wont stay runnin without choke .....was told i have an air boot leak or rubber joints for the carb needs to be replaced....any help would be highly appreaicated....HELP before i junk this amazing machine

  • Ztard

Posted January 27, 2010 - 02:14 PM

#2

Did it stall before the dealership worked on it?

Is the idle turned waaay down?

What is the current jetting?

More info will net you more info.

  • grayracer513

Posted January 27, 2010 - 02:20 PM

#3

It's normal for a carbureted engine to act lean and not idle for a time between when the choke is pushed in and when it finally reaches operating temperature. With everything right, it may be as much as 10 minutes before it will idle correctly. Are the guys at the shop telling you that they can't make it idle, either?

  • mkporn

Posted January 27, 2010 - 02:27 PM

#4

plugged pilot????? sounds familiar to the 10th degree...

  • cowboyona426

Posted January 27, 2010 - 02:58 PM

#5

My guess... the metal plate in the carb slide is in upside down.

  • spdnjoe

Posted January 27, 2010 - 03:27 PM

#6

my CRF did that and it was a plugged pilot. cleaned it out with some carb spray and ran great. This could be a possibility.

  • grayracer513

Posted January 27, 2010 - 03:34 PM

#7

My guess... the metal plate in the carb slide is in upside down.

That would normally have the opposite effect, making it richer at low throttle openings. BUT, you could be onto something, too. The seal in the slide plate could be damaged or missing, or the plate could be cracked.

  • cowboyona426

Posted January 27, 2010 - 05:15 PM

#8

That would normally have the opposite effect, making it richer at low throttle openings. BUT, you could be onto something, too. The seal in the slide plate could be damaged or missing, or the plate could be cracked.

Gray, when my 00 426 was almost new to me, I pulled the carb as completely apart as I could... mostly because I like doing stuff like that, and partly because I was either re-jetting or cleaning it. I managed to put the plate in the slide upside-down, because it actually looks correct installed that way. The bike would only run with the choke pulled out, and ran horribly. Push the choke in and it would die almost instantly. I freaked out, posted on TT, then went back out and flipped the plate around after someone suggested it. Bike fixed!

  • myoung

Posted January 27, 2010 - 06:14 PM

#9

got 2000 yahama yz426 with white bros series exhaust.....valves and carb rejetted by dealership....it runs good with choke on but when its off it dies...got a lil bog and hestation to it ....bascailly wont stay runnin without choke .....was told i have an air boot leak or rubber joints for the carb needs to be replaced....any help would be highly appreaicated....HELP before i junk this amazing machine



This is the way the dealer gave it back to you?

Did they try to fix it and found the air leak and told you to fix it?

Seems strange for them to claim they jetted something if it wasn't running right. What you described sounds like a clogged pilot circuit, but you'd think they would have cleaned that while they were in there. It could also be an air leak like they say.

If they gave it back to you like this, it probably still isn't jetted correctly. They may have even tried to compensate with the jetting for an air leak and now it's way off from where it should be. Or even worse, they tried compensating for a clogged pilot circuit instead of cleaning it, but I kinda doubt that.

Did this bike sit for a long time after you got it back from the dealer? If it did, it could have clogged up since you got it back from them.

Do you have a hanging idle when it's running? When you hit the throttle, does the RPM's hang high, then finally come down and it dies?

Did you turn your idle adjustment screw(black knob) all the way in trying to keep the idle up?

How many turns out on the pilot/fuel screw?

Do you have a receipt that says what size jets they installed?

Do a search for 'FCR hanging idle' or 'FCR pilot circuit', you will find a ton of information on fixing pilot circuits and air leaks. I just recently had to go through this and it drove me insane till I finally fixed it. Searching through all the info on this site sent me in the right direction to find the problem. :ride:

  • ganja772006

Posted January 27, 2010 - 06:30 PM

#10

thanks everyone ....gona take the carb apart and see if the slide cover is on upside down.....clean the carb once again and try that....im thinkin the cover is messed up ...gona replace the rubber intake too cuz it does got a lil leak ....but im new to this thumper talk ......its been real helpful!!!!! thanks everyone!!!:ride::thumbsup::lol:

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  • cowboyona426

Posted January 28, 2010 - 07:47 AM

#11

thanks everyone ....gona take the carb apart and see if the slide cover is on upside down.....clean the carb once again and try that....im thinkin the cover is messed up ...gona replace the rubber intake too cuz it does got a lil leak ....but im new to this thumper talk ......its been real helpful!!!!! thanks everyone!!!:ride::thumbsup::lol:

Just check it before you disassemble the carb... the flat side goes down.

  • ganja772006

Posted January 29, 2010 - 12:12 PM

#12

will do ....what is the differnce between the right way or the wrong way?? any clues??

  • ganja772006

Posted January 29, 2010 - 12:24 PM

#13

hey cowboyona426.....you just saved me a few bucks cuz i found the problem the throttle slide was upside and i put ti like u say and it runs like a bat outta hell.....thanks buddy so much for losing 300 bucks on 20 yr old mechanic at the yahama dealer...what a dumbass

  • ganja772006

Posted January 29, 2010 - 12:41 PM

#14

Thanks cowboyona426.....finally solved the problem after three months of headache never wouldve thought anything bout the slide i took it off and behold the 20 yr old dumbass that worked at the yahama dealer mess my shit up.....youre a lifesaver....what i owe ya??

  • myoung

Posted January 29, 2010 - 12:43 PM

#15

hey cowboyona426.....you just saved me a few bucks cuz i found the problem the throttle slide was upside and i put ti like u say and it runs like a bat outta hell.....thanks buddy so much for losing 300 bucks on 20 yr old mechanic at the yahama dealer...what a dumbass


Wow, that's just sad, you should have taken the carb back to them and showed them before you fixed it. I'm glad I can work on my own stuff, I wouldn't have thought a dealer mechanic would have made that mistake. But then I was having a hard time getting my head around them giving you a non running bike after they were supposed to have fixed it, I guess I shouldn't be surprised. :lol:

Glad you got it fixed though! :ride:

  • ganja772006

Posted January 29, 2010 - 12:44 PM

#16

The problem is solved and anyone whoever ....listen to cowboyona426 hes pretty damn smart.....saved me a trip and a few bucks ....see ya everyone im gona go out and play!!!!

  • ganja772006

Posted January 29, 2010 - 12:45 PM

#17

IT WAS A 20 year old kid that worked on it....i even called and told them you guys got a dumbass workin for ya......lol

  • myoung

Posted January 29, 2010 - 12:58 PM

#18

IT WAS A 20 year old kid that worked on it....i even called and told them you guys got a dumbass workin for ya......lol


Nice! :ride: :lol:

  • grayracer513

Posted January 29, 2010 - 01:02 PM

#19

It's an easy mistake to make. The throttle plate looks for all the world logically as if it should go in rounded side down, but it doesn't.

As far as Cowboy being smart, he's not too bad, but it's one of those things that's probably better if you don't ask how he knows about that particular problem. :lol: :ride:

  • ganja772006

Posted January 29, 2010 - 01:08 PM

#20

yea how did u run into that problem??? had to ask .......lol





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