SOHC.co.uk Forums > CB350/400
compression test.
THUNDERDOWNUNDER:
When I checked my compression not long back it wasn’t in the 150s you got me worried now ! And my 400/4 is just standard . No fancy bits Agh !
Andych:
The manual says it should be 170.7 psi with 9.4:1 Compression ratio. I couldnt find the upper and lower limits in the quick look I had.
I am sure it will be in there.
SteveD CB500K0:
One for the scientists:
If compression ratio is 9.4:1 and sea level air pressure is 14.7psi
Why do they specify 170psi?
14.7x9.4 = 138
Sent from my iPhone using Tapatalk
Bryanj:
If anybody remembers the C50L, it was a C50 restricted to 29mph to make it a moped, single saddle etc. I had one in the workshop, bout 30,000 and would not tickover. Compression on that was 115 which i considered ok but Honda said 140 so took it apart and found burnt exhaust valve due to the restriction method being a washer welded into the exhaust pipe at the head. New valve comp about 145 and tickover ok
ka-ja:
Thanks for the ideas, will go through the basics again, the engine should run and tickover judging from replies.
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