wont run right


6 replies to this topic
  • hende

Posted September 07, 2011 - 10:05 AM

#1

I have a 98 yz400f was out riding started cutting out then ran really rough. Cleaned the carb found a bad acc pump dyaphram put in a new one. now bike will start right up and idle all day as soon as i try to give it gas it dies.:) should I still be looking at the carb as the problem or think it could be the tps or any thing else elctical? or valves?

  • 1991CR250RBEAST

Posted September 08, 2011 - 08:59 PM

#2

Unplug the tps and see if that helps,if it doesn't help try other stuff.Process of elimination and persistance usually turns up the issue.

  • QuietFlight

Posted September 09, 2011 - 09:31 AM

#3

Still a carb issue. give it another good cleaning. maybe a pilot circut issue. check and reset your screw. maybe replace the pilot jet as they can become varnished over time.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • hende

Posted September 09, 2011 - 04:33 PM

#4

Cant belive I didnt check sooner all this time it was the gas. Flushed my tank put different gas and runs like a top again:banana:

  • 1991CR250RBEAST

Posted September 09, 2011 - 05:58 PM

#5

Cant belive I didnt check sooner all this time it was the gas. Flushed my tank put different gas and runs like a top again:banana:


Ive done that before :)

  • hende

Posted September 09, 2011 - 09:51 PM

#6

Ive done that before :)


Main reason I didnt change out the gas is the same race can it came out of is what the kids have been running in there go kart problem free.

  • 1991CR250RBEAST

Posted September 09, 2011 - 10:05 PM

#7

Main reason I didnt change out the gas is the same race can it came out of is what the kids have been running in there go kart problem free.



I'd imagine that tiny little piston in that tiny little combustion chamber takes a lot less inertia to turn an engine than it takes our thumpers from hell.We need all the gas we can get.I have noticed after two weeks with the same gas in my bike,it doesn't like it.I guess I'd feel the same if someone tried to shove three week or more old nasty food in my mouth.EEEEWWWW!!!:)





Related Content

Forums
Photo

First Hare scramble tips by dhend8


Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies
Forums
Photo

YZ450F 03 Sparks driving me crazy by SirAttard


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.