Massimo 500 secondary spring

[Swampdonkey]

Gonna be putting on an orange secondary clutch spring to try and help the underpower issue. Fun machine but is a turd when you need to spin the tires quick. Anyone else done any clutch work. Was also thinking about a new machined sheave later.

[Swampdonkey]

Got secondary spring on went for test ride. I'm guessing Primary wasn't all the way on the splined shaft and the nut worked itself off and ground the grooves away inside the sheave. Time to upgrade to a machined sheave from rhino

[Swampdonkey]

Also put heat cracks in back

[strike250]

Yes, it is very important to have those splines in place before tightening the nut, this is the result. I have seen it on many yamahas as well.

[Danny T]

SwampDonkey,  I know this is an old thread, but, I'm wondering what results you got from the orange secondary clutch spring.  I have found that there are several different weights of the orange spring.....which did you go with ?  I'm also looking at putting heavier slug weights in and another shim to help performance.

[Swampdonkey]

Orange springs are the same. You can get different od weight's to go in sheave. Did hot rod sheave drpulley lighter weights and orange secondary spring. Pretty sure it helped but the car that holds clutch in place sheared off in crankcase so not enough riding to tell for sure. Can't find the crankcase so thinking of swapping in a grizzly 660 I have