Engine Casting info for early CT70

J

Jukey3

New Member
Hello, Can anyone point me towards a reference that describes the casting marks on early (serial numbers under 200) Honda CT70 heads and cylinders. I have some early bikes and am trying to confirm if the heads and jugs are original to the engines. Thanks, Keith
 
Jukey3 said:
Hello, Can anyone point me towards a reference that describes the casting marks on early (serial numbers under 200) Honda CT70 heads and cylinders. I have some early bikes and am trying to confirm if the heads and jugs are original to the engines. Thanks, Keith
Click to expand...


The earliest CT70's have head castings with a diamond, and lines. 3 or 4 lines I think...not sure.
I'm also not really sure about the cylinder #'s. Maybe A1? "HM-A1" would be my guess for a bike THAT early. And it would have "72cc" cast in...no cmsquared stamp on the early parts.
If you post pictures....it's a much better way to get some opinions here on lilhonda.
 
Thanks for the info. I have a several early bikes, and the casting markings seem a bit confusing relative to the serial numbers. I could imagine that these were commonly switched around from engine to engine during servicing over the years. I do have a head with 1 diamond and 1 slash mark. I assume it is very early. I have seen heads with the diamond and both 3 and 4 slashs. Seems like other heads are then marked Ex where x is single digit number. I also have a couple of cylinders (jug) with HM-A1 on them, then others with HM-B3. Has there been any chart compiled that shows the approximate serial numbers vs. head & cylinder markings?
 
Back
Top