This project is coming along nicely. I decided to take Ed's advice and convert the reed 100cc cylinder to a piston port 100. Question - Which piston to use that doesn't have holes? Stock 76 rt 100 cylinder and head.

We have found that if it's jetted properly at sea level, you will need to go 2 sizes leaner on the main, 1 groove leaner on the needle, and adjust the air screw accordingly to run well at 7500 feet. That assumes you are using the same fuel and ratio.

Here is another question, with regard to the 125 crank. Is the 125 a longer stroke, or just a longer rod mounted to the same crank as the 100?

Edit - I found the stroke is the same, 50mm.

Great info all, thanks. Since the rt 100 motor is fresh and runs great, I may go the 125 motor route if the $$ isn't too much. If anyone knows where an engine, or wombat cylinder/crank sits, please let me know.

John Zazella

Great info Ed, and thanks. The purpose is to be able to race it in the euro 125 class. It would not need to be a rocketship, just get around the track and make it through a season.

John Zazella

All,
Is it possible to fit a piston port cylinder and piston to a 1976 rt 100 engine? If so, which year and model cylinder should I be looking for? Thanks.

John Zazella

Thanks for the help guys, got it running. The timing of the points was not correct, now I have to take the clutch unstuck. This toad has been sitting for a long time.

Victor,
Thanks, I do get a break in continuity when the points open, so that circuit is good. I will check the other items today, how to check the condenser? It may be cooked, but I am pretty good at soldering and didn't apply excess heat.

Hi All, I am new on here, and I need a little help with a 76 Road Toad. This one has no electrical equipment other than an ignition coil (no main switch, wiring harness, battery etc). Should I get a spark with just the blue and black wires connected to the coil? It has new points and condenser, stil...