421 Cheetah - need info?

[docbones]

I just picked up my bike with a Trinity 421 powervalve (cheetah). What size jets do you run in powervalves? What is a good compression for all around duning? I prefer to use 100 octane gas. Also, I ate up an aluminum rear sprocket every 2-4 hours. Any recommendations on a good rear sprocket? Has anyone experienced this? What is good all around gearing for the dunes using 20" Sand stars?

Thanks,

Doc

[RNBRAD]

I just picked up my bike with a Trinity 421 powervalve (cheetah).  What size jets do you run in powervalves?  What is a good compression for all around duning?  I prefer to use 100 octane gas.  Also, I ate up an aluminum rear sprocket every 2-4 hours.  Any recommendations on a good rear sprocket?  Has anyone experienced this?  What is good all around gearing for the dunes using 20" Sand stars?

Thanks, 

Doc

445835[/snapback]

 

Can't answer the jet ? but for 100 octane gas I'd run around 165/170 compression. Try the sidewinder tool steel or Timoly sprockets. They should last years. Stock gearing should be a good start with those size tires.

[sandslinger]

i have a 421 cheetah and run 38 pwk's for carbs and use a 145 main jet . i ride mostly at sand mtn., nv which is about 4000 ft.

[lonestar]

I just picked up my bike with a Trinity 421 powervalve (cheetah).

Edited December 8, 2005 by lonestar