Jump to content
Sign in to follow this  

HELP W/2003 cr85r

Recommended Posts

Need some help..my sons 85 with just rebuilt(top end -everything), while he has been breaking it in..it has been fauling plugs like crazy. The mix is 32-1,going to change to 40-1. see if that helps..but here is the prob

if I put a new plug in.....it fires right up..runs for about an hour or more then "bogs" down and quits...Put another new plug in..same thing..

The plugs come out a little oily...try to clean them and use again but now it wont fire or do anything.

Should I pull the top end apart again???

Share this post


Link to post
Share on other sites

ive been having the same problem with my 2004 cr 125. ive heard some people mixing 50:1. it could also be the carburator might want to try difforent needles.

Share this post


Link to post
Share on other sites

What type of mix are you using? If your using something like Mutol(like I use), you will have that same problem because you can go up to 52:1(I go to 42:1). So something like 32:1 will make the plug is very oily. I do know that the 1st 2 hours of a new top-end is the most important. If the bike has never been fauling plugs before the rebuild, then most likely your okay. It is for sure better to see a little oil on plug then to see it white and dry.

Also, for those oily plugs..........a little gas on them and blow them off with air compressor does wonders. :applause:

Just a thought.......use a hotter plug. :bonk:

Share this post


Link to post
Share on other sites

The solution is when I had my cr85 it would do the same thing. They ask for a br10eg I think and I put a br9eg and u can even use an br8eg. If its bad then use the 8 it will not hurt.

Share this post


Link to post
Share on other sites
.......use a hotter plug.....

i did this with my 04 . we went up to a mx shop and the dude gave us a hotter plug and it worked perfect

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×