QuestionHi from OZ Bill , after setting an Australian land speed record on a Honda CT110 (71 MPH) I'm toying with the idea of coaxing some performance out of a pushrod C102 honda 50 engine, and I was wondering if you knew the rocker ratio of these engines (it looks to be 1/1)
Also , If you have any experience in cub performance improvements you could share with me, it would be appreciated.
I plan on measuring the piston/valve clearance with the view of increasing comp ratio, reshaping the cam lobes without putting the power band too far past the auto clutch take up (unavoidable , I think)along with a bit of inlet porting, replacing the soggy valve springs, and maybe an ex CT110 carb?
Any sugestions Bill
Bob (52 y/o)
AnswerBob, congratulations on your record! The C102 is pretty much the same as the C100-105s, but for the electric starter equipment and the different ignition system.
I actually have a copy of a 1962 article of some suggestions as how to modify these engines in various ways.
For one thing the C110 head is alloy, which may be helpful for your project. Early bikes had alloy valve spring retainers, too.
Contact me through my website: www.vintagehonda.com and I will try to scan as jpegs and email the pages or run OCR and extract the info to you in a doc file.
I haven't measured the rocker ratio, but I think it is 1:1, too. WEBCO had a lot of racing cams for Hondas and some of the old-time cam grinders may still have the masters for them... like MegaCycle.
Bill Silver
