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1965 Honda CP77 — Ulsan Metro City, Rep. Korea
Restored with original parts — Owner: J. Doe

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jensen
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Post by jensen » Tue Aug 24, 2010 10:14 am

Hi,
If you want to be absolutely sure about the engine, pull the head, pull the cylinder and see if it is a 8 hole cylinder and crankcase. Nothing is 100 % sure in life, but a 10 mm spark plug head always goes with the 8 hole cylinder. I have never seen it in a different way (but that doesn't mean that it is a fact).


Wrong again, thanks to the people who pointed out that this info is indeed not 100 % correct. It seems to be possible to find a 12 mm spark plug hole head on a 8-hole cylinder.

Thanks for sharing the info,

Jensen
assembly of Japanese motorcycles requires great peace of mind (Pirsig)

LOUD MOUSE
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Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Post by LOUD MOUSE » Tue Aug 24, 2010 3:03 pm

Ya don't need to take the engine apart to tell if the cylinder assy. is 8 or 9 holes.
Just look at the lower front where the cylinder assy. fits to the top case.
Tis visible for sure. ......................lm

jensen wrote:Hi,

If you want to be absolutely sure about the engine, pull the head, pull the cylinder and see if it is a 8 hole cylinder and crankcase. Nothing is 100 % sure in life, but a 10 mm spark plug head always goes with the 8 hole cylinder. I have never seen it in a different way (but that doesn't mean that it is a fact).

Jensen

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