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Discussion Starter · #1 ·
Greetings,

I have just completed a rebuild of a 69 T100R. I am running one amal 26mm concentric carb and was wondering what the performance difference be between the cam angle of of a 100C and a 100R. I am just curious what I might gain (or lose) if I set it up as a 100C.

Thanks for all replies, if I receivce any.
 

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I've been waiting to see an answer to this question myself. When I did the top end, I did not pull the cam gears and only recently realized that there are different cam timing settings for 'single carb' and 'dual carb' setups. I'm considering going in later this year and re-timing the cams for the 'R' setup to see if I gain anything.
 

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I am pretty sure the c and the r have different cam numbers and different cam followers so not sure what you would get if you set up a r cam system to a c.
 

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Discussion Starter · #4 ·
I'm not sure if there are different cam shafts or the cams are just postioned to a different keyway on the cam pinions. I'd like to know what the performance difference would be.

Surely someone on this forum has expiremented with this in the past.
 

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There were different exhaust cams for a while, can't remember if they eventually became the same ... My bike (technically a 'C') runs Daytona cams and R radius followers. It's single carb, but it's a 928, not a 626. I'm tempted to re-time the cams and see.
 

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I going to take a shot in the dark here. My experience with cam timing(engines in general) leads me to believe the single carb/100C models have the cams slighlty advanced compared to the dual carb /100R models. The reason why. Advancing the cams will move the power and torque curve to the low and middle rpm range. This would be better for the C (off road) model.
As for the "R" model ,according to the factory specs, makes its peak horsepower at a higher RPM.
 
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