Can Idle Speed=Fouled Plug???

3 replies to this topic
  • Sparky_So_Cal

Posted March 05, 2002 - 09:51 AM


Last night i changed my oil and went through the procedure of starting my bike in my garage for a few minutes to make sure all the cavities had no air in them (I know i am anal). I let my bike warm up enough to turn off the choke, but never cleaned it out riding down the street. When I was done, i increased the idle a bit and then killed the bike. This a.m. i went to my local track and the bike started 2nd kick and w/ choke and ran for about 10 seconds before fouling the plug. I have had the bike for 2 months and never had a problem and was wondering if i have my idle up to high can cause it foul when cold??? Or do you think because i didn't warm it up properly and maybe there was some residue oil left over from last night which caused it to foul the next day??

Any info would be greatly appreciated..

Dave (Sparky)

  • ldan

Posted March 05, 2002 - 04:40 PM


I had the same problem. I did the BK Mod and haven't fouled one since, but now I always make it a point to ride it if I start it. Not much, just enough to tear up some grass in the yard! No more problems. Good luck.

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

Posted March 05, 2002 - 09:26 PM


Try starting the engine cold without using the choke. I simply turn the idle knob about one turn in and then kick it through about 10 times or so with the compression released and then see if it starts within one or two kicks. I think I've used the choke maybe three times in the two years I've had my 426. It has never fouled a plug.

  • sirthumpalot

Posted March 06, 2002 - 01:17 AM


There are many threads on here about fouling plugs, I think it's worth doing a search to get some info. It seems that there are many fixes. For me it was changing brands of gas (from Mobil to Chevron). Good luck!

Related Content


Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Wilson the Blue Privateer by jetfuel

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies

05 yz450f not fast enough by RedeyeYZ

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  38 replies

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.