Heres a question for you
The Mugen motor mounts will not work on the PRP XR8 or the XR 80
Contact Happy time Hobbies in Ca, and order the one piece motor mount, and then use the Mugen clutch system<clutch flywheel, clutch bell,complete assembly> The PRP clutch bells are prone to split into because they are aluminum.
PRP does make a two piece motor mount, but if you are going to change it out, the one piece is much better.
Both motor mounts allow the engine to sit lower in the chassis, and this will allow the flywheel to make contact with the starter box.
For a little more fuel capcity, us the Kyosho Evolva fuel tank. The top chassis plate will need a little dremmel work<very little> but the Kyosho tank will then drop right in.
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