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Ok so RPM is another thing that makes me go huh. Currently the (standard) 2200 RPM engagement speed is lower than my li’l engine’s peak TQ which is listed as 3000 or 3250 RPM depending on which spec sheet you go by. Unfortunately I’ve never found a graph anywhere that actually shows the torque...

I’ve found that is a really handy quick calculator Hellion, I use this one too. Speed, RPM, Ratio Calculator. You can manually plug in the high or low 6” or 7” driven CVT ratios in place of sprocket teeth to get theoretical results.

Pretty sure the bearings aren’t stopping the driver from shifting into high gear. You can watch the belt climb to the top when free revving with the rear wheel in the air (cringe), I know I know. So again, if 10/60t on a 13” dia. tire is fine will 10/83t on an 18” tire net the same or similar...

I get sprockets made any pitch and number of teeth I need, Azusa, ESP, Rebel Sprockets etc. Due to price increases these past few years I’ve taken up using adapters so that I can utilize what sprockets I have, for trial anyways just to see what works best.

My 3 horse was only turning 6400 RPM with the centrifugal clutch & jackshaft setup. I weigh a buck fifty and the little bike another 70.

So if 10/60t on a 13” dia. tire is fine wouldn’t 10/83t on an 18” tire net the same or similar results? Not those big floaty dune buggy tires but narrower low rolling resistance tire using higher air pressure.

As I understand it the low and high speed ratios are the beginning and end points for the continuously varying ratios in between. Can anyone tell me what the ‘overall speed’ ratio is, how it’s determined or calculated and what the importance of it is or how it’s used in CVT tuning?

I’m currently running a 7” driver and 8t on the jackshaft with 415 chain. I still need to go larger on the rear sprocket as I’m still over geared and unable to take full advantage of the tallest CVT ratio. What I’m looking for is someone who knows what a good jackshaft to rear wheel ratio is...

They are actually two individual narrow shielded bearings. I think the original idea was to replace the thin brass bushing which people had problems with on the really low grade 3/4” China clone drivers. When the busing on genuine Comet drivers are properly maintained and lubricated they seem...

Uhhh yeah… precisely why I’m searching for leads on small bore resources. Thanks again

Thanks Denny, GoKart Suppy is where my learning curve started, there and GoKartNerds which helped increase my knowledge. There’s a lot of info in the groups and forums as well as YouTube that cover CVT tuning for the 212 as well as big blocks but virtually nothing on the 3hp engines. I’ve found...

I’m looking for any help locating a site, forum thread or experienced person to share knowledgeable information on 30 Series CVT setup and fine tuning on a 3hp engine, primarily drive ratio(s) & RPM. I would be happy to share what I learned about cheap n easy shaft adapters that will work vs...