Motorcycle Repair: some power, valve spring retainers, coil ignition system

Question
Hi, Bill
This is not exactly a repair question. I own a 1965 Honda ca110. I had some trouble getting it jetted properly and I have to do so every couple of months, which is fine. I have seen and read a little bit about these little things being raced, along with other 50cc bikes. I was wondering, do you have any tips on getting a little extra power out of it? I'm not trying to take it on the freeway, I just thought a little more would be fun.
Thanks
Billy.

Answer
Billy....  First, be sure that you have a sound engine to work with. Check valve clearances and compression readings. If within specs, check the ignition timing. The points rubbing block wears down and retards the timing. Always check timing FIRST before fiddling with the carburetor settings.

It took awhile to find a file that was buried in my computer, but here is an extract of the C110 racing section:

RACE PREPARING THE C110
     Here are the racing preparations for the C110, which
have proven quite successful for road racing and will reach speeds of 65 m.p.h. with proper tuning.
  1. Install a CB92 carb..
It will be necessary to fabricate a 20 m.m. distance piece to mount the carb to the frame. Then fabricate an adaptor for the carb flange to fit the rubber intake tube. If at approximately sea level, use a #100 main jet as a starting point in your carburetion tests.
2. Use the new separate coil ignition system. Change
to a 40 degree full advance.
3. Remove the lighting system.
4. For road racing use spark plug C12H or C13H
5. Use the heavy duty valve springs.
6. Use the aluminum valve spring retainers.
7. Use high compression racing piston (CY1101361 and rings C1001364)
8. Use an SAE 30 non-detergent oil.
9. Use the C100 exhaust pipe. C1003941B
10. Use a megaphone. C1003901
11. Gear for your weight and the course.
12. Tire pressures, front 22 p.s.i., rear 26 p.s.i. .
13. Your horsepower range should be from 6,000 to 10,500

Bill Silver