2006 CRF 250r stock piston compression? -CRF's Only Forums

Nstyle · by **Nstyle** » Sun Dec 04, 2011 5:26 pm

I just did a compression test on my 06 CRF 250R and it read at 60 psi on the dot...I don't have the manual yet so is that a good compression?

dirtae · by **dirtae** » Sun Dec 04, 2011 6:57 pm

I'm not 100% sure on this, but a regular compression test won't tell you much on your bike because of the auto decompressor. It won't be an accurate reading. If you are looking to diagnose a problem you need to perform a leak down test. I'm pretty sure the Clymer tells you how to do the test. I don't have my manual handy so I can't say for sure.

Nstyle · by **Nstyle** » Sun Dec 04, 2011 7:00 pm

Okay thanx I was going to order the clymer this Monday but when I was doing the test I also noticed some engine oil on the spark plug but no smoke when running the bike...could this be bad rings?

dirtae · by **dirtae** » Sun Dec 04, 2011 7:06 pm

Definitely order the manual you can get it from this site! As for the oil on the plug I can't answer your question as to whether it bad rings or not. One of the more experienced wrenches in here will be able to answer it for you sooner or later though!

Is there something wrong with the bike? Or are you just do maintenance? Was the plug full of carbon, or actually oily?

Nstyle · by **Nstyle** » Sun Dec 04, 2011 7:10 pm

Bike runs very well I was just doing monthly maintinence....first compression test though...the spark plug had small carbon as usuall but up before the threads was real unburnt engine oil.I never saw this before.

Nstyle · by **Nstyle** » Mon Dec 05, 2011 4:37 pm

Would anybody have an idea?

Nstyle · by **Nstyle** » Tue Dec 06, 2011 2:24 pm

Can anybody help cuz I have no clue y there would be a pool of oil on my plug.

by **crfsonly** » Wed Dec 07, 2011 11:21 am

check your thread on this question. that oil is coming from the valve cover spark plug seal...it is either damaged or installed incorrectly.

ken

Nstyle · by **Nstyle** » Wed Dec 07, 2011 4:43 pm

Awesome thanx Ken! I will check that tomorrow. I'm just glad it's nothing too bad..should I replace it anyway?

by **crfsonly** » Wed Dec 07, 2011 4:48 pm

definitely replace it if it's damaged or warn. if not and it's just not installed correctly fix that and you'll be set.

Ken

Nstyle · by **Nstyle** » Wed Dec 07, 2011 5:00 pm

This is under my valve cover right?

Nstyle · by **Nstyle** » Wed Dec 07, 2011 5:22 pm

Sorry very stupid question I work on my bike all the time I should know were that is.. Just wanted to be safe ..any way thanx Ken u just saved me a lot of work to figure it out my self

dirtae · by **dirtae** » Wed Dec 07, 2011 5:22 pm

Not a stupid question, I always ask questions like that when I'm unfamiliar with what I'm working on. I never worked on a 4 stroke before I bought my CRF 250r. This site and the clymer has been an amazing help. Better safe than sorry!

Yes, pull the cover and look under it, there should be a black rubber seal where the plug goes through. If its not there it might have stuck on the spark plug tower on the head (where the spark plug goes through). When I pulled my head it stayed on the valve cover though.

Hope you've ordered the manual by now! Torque bolts back down to spec when replacing the valve cover.

by **crfsonly** » Wed Dec 07, 2011 5:54 pm

dirtae brings up a good point...when torquing the valve cover bolts make sure not to over torque them. they are known to snap or strip.

ken

Nstyle · by **Nstyle** » Wed Dec 07, 2011 6:00 pm

Awesome thanx guys And deffinetly ordered the manual. Also thanks for the warning on the bolts that would be a whole new head

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