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Brst Pipe adn Clutch Kit Combo?????
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Posted by: jread14

We are buliding a Apex 90 with a ported cylinder and decked head and are not real sure what the best pipe is out in the market. Also, what clutch springs/toque spring/rollers would you recomend? Last thing, is there any reason to replace the ignition? Thank for the help.. JR

Posted by: wrhracing

Whom ever is porting your cylinder could tell you which pipe. If they don't know you can call me and I can recommend one. It will be use ful to know what duration the transfers and exhaust are.

Roller weight and torque spring tend to vary due to the roller ramp angle in your variator.
Roller weights will vary due to exhaust port size,and the exhaust pipe.
At least a 1000 KOSO rear spring which is a 100 LB. spring , or the 105 lb malossi red spring.
With shallow roller weight channels, (NOT STEEP), probably 4.0 to 5.0 gram roller weights.
With steep roller weight channels, 5.5's, 6.0's, 6.5's.
Some more info and people will start to chime in on what they run.