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Cb 550 ss spain

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murdock:
the kick start no longer offered any resistance, it did not exceed 120 k / h on the highway, I know it was a bit rich but not much, with 100 jets, velocity stacs and quite open exhaust, maybe it was because of the gap in the rings , or reverse rings,
now it doesn't matter
It will be very entertaining to rebuild the engine, I guess this week I'll open it

Thank you very much for your assistance

K2-K6:
As Bryan has said,  you need to measure piston skirt to bore clearance at front or back of piston, not at the side underneath rist pin.

Also, put the barrel upside down and let the piston go all the way down to the end of bore. If you measure them right at the bottom of the barrel,  then it won't show much wear as the piston rings don't travel that far down. 

Likely with velocity stacks that the rings will be worn as no dust is filtered very effectively.  Just depends whether bores are too.  If it runs rich as well that won't help the rings as it washes oil from the bores to increase wear.

Bryanj:
I dont doubt your proficience in tool use but to get a proper reading you need a short hose on the compression tester as a long hose increases the final volume by a marked amount reducing the max compression figure. A better diagnostic test for a small petrol engine is a leak down test where you put the piston on tdc compression and force air invia the plug hole then measure the % pressure drop listening for where the air leaks

murdock:

ok, that sounds good, I'll try next time, thanks for the tip

murdock:
maybe this is the way to do it ???

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