Was very excited to try this clutch. The engineering is awful. The thing is just too big. There is just not enough clearance for it to work well. The whole thing should have been .020 narrower. The clutch material sits so far on that it rubs on the radius on the bell where the fluid release holes are. Tried it on 4 different bells and it rubbed on even the smoothest spot welds. Even dremeled down the inner arbor of the clutch sits wayyy too close to the bell for comfort. And for whatever reason once the clearance issue are fixed it makes the transmission very loud. There is no signs of rubbing or contact now with a modified and smoothed clutch bell but swap it out with a stock clutch and the transmission is 10x quieter. This is no more than a paperweight.
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Tons of potential-make your bike a wheelie machine
June 20, 2021
taco eater :
Puck from FL, United States
Heaviest springs included fully engage around 5400rpm...but pro tip: Malossi Maxi springs (https://www.treatland.tv/ProductDetails.asp?ProductCode=malossi-springs-2911326) work and will give you even more RPM for dig ripping. Around 6k on the whites, 6300ish on the yellows, and 6500+ with the reds. Really helps get on the pipe quickly if you have a big boy kit and high RPM pipe setup, and reduces the 1-2 shift delay if you're on a 2sp. Not as good as a vari, but gotta take what you can get. Using on a Gila kitted Tomos on a 90s GT Dyno that goes way too fast way too quickly. Note that low speed cruising (~20mph and under) is pretty much impossible with the yellows and reds, slips too much and makes a ton of heat, so be prepared to blast-n-coast around slow neighborhoods.
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A35 Frankenstein
June 20, 2019
taco eater :
Bogdan Balagurak from Ephrata, PA United States
This clutch... this clutch is excellent! smooth shift into second and keeps the power, hills are really nice too, very torquey. Only issue I had was putting it on, the included shim did not let the crank spin so I ground the spot welds on the bell and the 3 bolts on the clutch with a dremel and all is fine. Solid
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niiiice
March 5, 2019
taco eater :
James olson from burnaby, BC Canada
so the clutch works great,, no lag off the line, straight power... one thing is though, now the gear clicking sound has become at least twice as loud,,,not sure why as i didnt touch the gears. but clutch is awesome
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Bolt Issues
February 13, 2018
taco eater :
Casey E. from Washington, DC United States
If you're having problems getting the clutch to spin freely in the clutch bell like I did, you're going to need to buy some shims or file down the bolts on the back of the Jammer. The bolts stick out slightly and catch the clutch bell which was a pain in the arse for a novice mechanic to diagnose. Hope the next batch of Jammers come without this issue.
Very very poor engineering 
Tons of potential-make your bike a wheelie machine 
Bolt Issues