Loud Pops & Sputters until motor is Hot?

3 replies to this topic
  • hsstar

Posted December 17, 2002 - 06:09 AM


I Know my bike is cold natured, but something is not right.

Recently started poping and sputtering for the first 10 minutes of riding. I already warm the motor up for a few minutes before hiting the woods. Once the motor gets hotter it runs fine. I never had this problem until a few weeks ago.

I took the carb apart and found no dirt or anything clogged, the float measured in corect at 9mm.

I checked the valves 2 months ago and all was in spec.

I have the WR carb gutted to YZ specs. I dont think I should change any jetting because the motor ran fine for 3 years with the jetting I have.

I tried cr9e and have always run the cr8e. Same popping

Should I hook the grey wire back up?

Could it be muffler packing????

If anybody has had the same problem Please advise me of the cure.

  • Dan_Lorenze

Posted December 17, 2002 - 06:29 AM


Star, Did the bike all of the sudden start doing this or did you pull the carb apart and when you got it back together it started doing this?


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

Posted December 17, 2002 - 06:54 AM


All of a sudden.

Pulled carb apart to try and fix.

Thanks for asking.

  • waynewr

Posted December 17, 2002 - 08:04 AM


Just a couple considerations:
Hope your not having valve trouble, that repair is challenging.I know sometime a worn exhaust valve seat can cause this noise as combustion leaks into the header.

Is there a possiblity of bad gas causing pre ignition?


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.