SOHC.co.uk Forums > CB350/400

compression test.

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ka-ja:
Hi,
    Having carburation trouble with the old 460 Yoshy, are compression readings on a cold engine I to 4 cyls readings show  as 150,140,150,150 any good.

Bryanj:
Less than I would expect for HC piston but testers vary ideally check a good standard motor and compare

ka-ja:
 thanks Bryanj, sorry but no standard motor to check against, the big bore is 6,000 miles and 35 years old, and new rings seem unobtainable, unless cruzin image rings will go on Yoshi pistons.

ka-ja:
Compression test done cold using electric starter, no oil down the bores, all plugs out and carbs removed from the engine

Bryanj:
It does depend on the tester for example it it has a long lead from head to gauge it increases the "closed" volume by a significant amount on a small bore, thats why i suggested testing on another engine for comparison. Rings shouldnt be worn out yet but stranger things have happened.
Was it just the yoshi bore or did it get a cam and other stuff?

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