GUIDE
This guide is designed to provide a list of common faults and the best course of action to fix those faults on a CPR GT Clutch.

Please note that recent gt clutches are a gold/copper colour, not the silver colour as pictured.  The other components will look identical though (such as the springs and shoes).

CONTENTS


1. Grabbing at idle

2. Clunking/Hammering/Clinking noise

3. No engagement until very high rpm

1. Grabbing at idle

a. Drive sprocket bush failure -> Replace clutch

b. Springs stretched or broken -> Replace springs

c. Warped (out of round) drum -> Replace clutch

d. Glazed drum (inside of drum will be polished in places) -> roughen glazed areas with sandpaper / replace clutch

e. Glazed / overheated shoes (usually these are discoloured like titanium when it’s heated) -> Clean with brake fluid, roughen with sandpaper -> replace shoes

f.  Contaminated shoes (by oil/chainlube/dirt/rocks/debris) -> Clean with brake fluid / service as per our guide https://cutpriceracing.com.au/store/GUIDE-Disassembling-Servicing-Assembling-CPR-SR-Clutch/ -> replace shoes (Be careful not to over-lubricate your chain and to make sure there are no leaks from your side-cover gasket on your engine to avoid grease/oil from entering the clutch from the rear)

2.Clunking/Hammering/Clinking noise at idle

See C to F above. If the clutch is operating correctly otherwise, most of the time using the clutch will rectify these issues over time.

3. Not engaging until extremely high rpm

a. Shoes binding/stuck -> Disassemble, clean, re-assemble as per our guide https://cutpriceracing.com.au/store/GUIDE-Disassembling-Servicing-Assembling-CPR-SR-Clutch/

Ensure the surfaces between the shoes and the core are clean and slide in and out without too much force required.  They can be tight enough that the shoe will not fall out, but not too tight that a strong tug is needed to break the shoe free from the core without springs installed.

b. Wrong springs installed -> Replace with lower RPM springs