Just wondering what the spring holes mean on a cat secondary clutch. I know the middle is netural/standard, but what does one way or the other way do? Please help...just curious...

actually the holes are numbered 1 to 5 and the middle is 3. the higher the number of the hole the tighter the tention on the spring , the lower position the lesser tention is on the spring. the more spring tention the higher you peak rpm will be . its aprovimately 150 rpm per hole either way

The holes in the secondary cover provides you fine tuning settings. Nominal set-up would be in the 3rd (middle) hole. Going clockwise to the 4th or 5th hole would give you a torsion increase, RAISING the shift rpms about 150 for each hole moved. Likewise, going counter-clockwise to the 2nd or 1st hole, you will DECREASE tension, therefore lowering shifting rpm by about the same 150 rpms per hole moved. Big-bore,hi-torque motors can run stiffer springs in a stiffer setting to prevent belt slippage,,smaller sleds (500/600) can be tuned with lighter springs in a softer setting as they make less torque and use lighter weights, as using a stiff spring or too much secondary preload will cause lack of top-end from incomplete clutch shiftout. snap

:div20: Right on!! never can figure out why some guys like putting heavy springs in small sleds, that back shift is hurting somewhere else, good for a couple hundred feet,,,R2R