Cylinder compression

[Hunter]

Hey Guys

Have you tried testing the compression on your bikes? I have an NSR RK and get a reading of about 8 bar (approx 112 psi) which seems a little too low! But the bike seems to run okayish and Its been like that since I bought it (have done 10000 miles). Wonder If I could get away with just changing the piston + rings?

Cheers for any help!

[Hunter]

Nobody checked their pistons for compression rates?

Just put all things back together again on my bike.. and its actually started the first time around.. heheh.. sorted!

[Robby]

the nsr has a relatively low compression - they had it a while back in superbike with a 125 test, the NSR was about 8.4 and the RS was about 9.6 i think. which is part of whys RSs pop more.
your reading is fine, so dont open the engine up its an expensive process.

[Hunter]

Cheers Robby for the response! I was a little concerned though cause the work shop manual says 10 bar (+- 2 bar), and mine was just 7.75 to 8 bar. hmmmm.. well it is an old engine (about 9 years old) and the mileage is 10000 miles!

Anyway.. I thought i'll keep the engine intact until something else crops up.

I was a little worried that too much piston slap can cause the nikasil plating to get wasted. Just don't have much experience with performance bikes or 2 strokes yet! Any ideas? :)

[Kickstart]