SOHC.co.uk Forums > CB500/550
Cb 550 ss spain
Trigger:
It doesn't matter what rings you use, if the piston to bore clearance is out of spec, the engine will smoke ;) And if you have honed it, it will be out and new rings would not work .
McCabe-Thiele (Ted):
--- Quote from: Erny on April 06, 2021, 10:12:02 PM ---If I can ask - where did you buy that tool?
I'll be working on my engine probably next winter so I want to prepare myself ;)
--- End quote ---
I used a tool like that in the late 1970's on an A series engine - the bores were brilliant afterwards - trouble was it would only tow start afterwards so had to take the engine out again to getr it rebored! Never touched a glaze breaker since!
royhall:
My GS1000 top end was "rebuilt" by that toss*r so called mechanic at RapSuberbikes. They re-honed the bores and fitted new rings, lasted 600 miles before it was smoking badly. On measuring the bore to piston clearance was over 7 thou, that's about four times as much as it should be. Gentle deglaze by hand with some oil on 1200 grit wet and dry at the most. Then check the sizes are in spec before rebuilding or you will be doing it again.
Bryanj:
Thats why i suggested the flapwheel, its same as using wet n dry
murdock:
well, ok, they have convinced me, I will change the whole kit, pistons and rings, at first that was the idea, leave the engine as best as possible within my possibilities. I love that motorcycle since I was 8 years old, the older brothers of My friends had some and I died of envy, so when I could after many years I got one, it is very fast and docile for traffic and small walks, I use it to go to work.
well, now determine how much will go up?
0.25 or more? What improvements can I make above to improve performance without changing barrels? I'm talking about jobs that can be done at home, when I find someone to enlarge my barrels, what tolerance should be respected?
thank you very much for your help
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