83 xlr600 detonating

3 replies to this topic
  • 83xlr600

Posted August 14, 2004 - 09:46 PM


hi there

my 83 xlr600 detonates when under heavy load as in trying to accelerate from cruising in a higher gear or when pulling wheelies does anybody know wat the problem may be i run it on 91 octane fuel and it has a dpr8ea-9 which is the best ive tryed with it, it also starts and runs perfectly except under heavy load the noise is a heavy knocking like the piston trying to slap and was wondering if anyone had experienced this and had a fix for it thanks

Casey lyons

'83 xlr600

  • targetdrone

Posted August 15, 2004 - 09:31 PM


My first thought is to check your timing.

Has the bike just started doing this?

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

Posted August 15, 2004 - 10:24 PM


I'd check the jetting first, sounds lean. You're on the right track a cooler spark plug does help.

  • 83xlr600

Posted August 16, 2004 - 10:04 PM


i have checked both cam and ignition timing and are all fine, it may be the mixture but would usualy lean out all the time not just under extreme load ill put a gas analyser on it to check jetting also i was going to run some avgas(avaiation fuel) in it to see if it runs better on a higher octane fuel as the head could have been machined before i bought it any other help or ideas would be much appreciated

casey lyons

Related Content


Post Apocalypse, ThumperTalk style! by Justin Pearson

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  35 replies

FCR40 Tuning Woes- XR600R by aTuWitty

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  37 replies

Can anyone identify this xr600 piston? by ms_mtn24

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 4 replies

Engine Loping/Sputtering by tcaldwell

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 2 replies

Cle Elum Sunday 5/29: Looking for dual sport tips by TigerTanker

Dirt Bike   Dirt Bike Regional Discussion   Northwest
  • Hot  32 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.