TAPP x Evolution Clutching Instructions

We have found the best way to install the TAPP clutch is by the “valve lapping” technique between the clutch to the engine crank shaft. This should be done every time you remove the clutch from the engine crank shaft to ensure there is a perfect mate between clutch tapper and crank shaft taper not allowing the clutch to spin on the crank. We recommend Permatex™ fine grit.

If you are using the Can Am OEM bolt, you will need to torque the primary bolt down to 89 ft/lbs and drive the car up to 4000rpms, then re-torque to 89 ft/lbs. Repeat this process while slowly raising the RPMs each time. Do this until you are able to make a few wide-open pulls without the bolt losing torque to ensure the primary bolt is torqued completely or it can come off.

EVP designed and built a primary clutch bolt specifically for the TAPP clutch that outperforms anything else on the market [X3 XR Series Primary Clutch Bolt, TAPP (SKU:404FC0039)]. If you are using our recommend XR Series Clutch Bolt, you will need to follow the same process, but torque to 110 ft/lbs. instead. It usually does not take more than 3 re-torque cycles before our bolt stops losing torque.

2022+ Pro R: Reuse OEM clutch bolt with supplied spacer.

2020+ Can Am X3: You must remove the clutch cover liner for the or the Tapp clutch cover will rub.

2020+ Pro XP/ Turbo R: You must purchase EVP clutch cover shim over the clutch cover or the Tapp will rub on the outer cover.

2017-2021 XP Turbo/S: EVP also has a clutch cover shim kit allowing more room for the Tapp.

There are (4) main adjustable components on the TAPP primary clutch: Ramp Profile, Ramp Angle, Roller Size, Adjustable Weights. Always use Blue Loctite when adjusting the weights.

The ramp angle in your TAPP Clutch is adjustable from the outside via the use of the Quick Shift Bolts. As with other clicker style clutches the higher the number, the higher the RPM. This will mainly affect the full shift speed but also affects the engagement and low speed slightly. On the TAPP clutch each ramp has its own quick clicker adjustments. Each clicker has (6) adjustments. Each click will add or subtract 25rpm but they need to be done in opposite pairs actually adding/subtracting 50rpm.

Your TAPP clutch comes with a set of (4) pre-chosen ramps that have been tested in many scenarios and are calibrated for your vehicle setup. Each ramp has an “A” profile side and “B” profile side. “A” side will always be lower engagement, “B” side will be higher engagement. Changing the profile of the ramp will have many effects on the shift profile including engagement rpm and back shift. This should only be done by an experienced tuner.

If you’re needing to make drastic changes to your engagement RPM, for example if you were changing from trail riding to drag racing, you’re going to need to flip your ramps around. This can be done with the clutch on the car and the cover still on. Every TAPP ramp has two sides, side A and side B. Side A is always the lower engagement. With the 1335 ramps, you will be at 2000-2500rpm engagement on side A, and 3000-3500rpm engagement on side B. You can also set two ramps to side A and two ramps to side B to meet somewhere in the middle. The 1335 ramps do not require any other changes to be made to the weight setup as the profile is very similar on both sides. Other ramps such as the 1336 or 1328 may require further clutching adjustments to be made when you flip your ramps around. Please contact us for further assistance if needed.

There are 3 sizes of rollers available: standard, 1mm oversize, and 2mm oversize. Bigger rollers make the low end "quicker RPM's" but shift out quicker and lower the full shift RPM. Smaller rollers make the engine slower shift and raise the full shift RPM. This has to do with the angle of the arms combined with the weight difference of the rollers. The roller assembly consist of a roller, axel, and two washers.

The weight in the arms can be adjusted in two ways: set screws in the arms, and washers on the roller thru bolt. Your clutch was shipped with a standard tuning kit. As with all other clutches add weight to lower RPM, remove weight to raise RPM.

A good rule of thumb when choosing how much weight to add or remove from your clutch is that 1 gram per arm equals just under 100rpm. For example, if you’re targeting a 9000rpm shiftout and you’re only hitting 8600 at WOT, you would want to remove roughly 5 grams of weight per arm as a starting point. Adjust this as needed for your application.

Allen screws must be added in pairs opposite to one another. Allen screws are .500” weighing 2.7 grams. Adding two Allen screws will add 5.2 grams. Added all eight Allen screws will add 20.8 grams.

The TAPP clutch includes a roller weight kit with the following parts.