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I have what I believe to be a Coffman rocket exhaust system on my 701 62t superjet. The system looks a lot like the Protec system or Riva but mine has the head pipe/expansion chamber silicone coupler. I'm look for a place to buy the 4 bolt gasket that goes between the exhaust manifold and head...

I'm looking to purchase a 90 superjet with the OEM 650 engine. It is suppose to have port work done, head milled, rejetted carb(not sure of size), prop, ride plate and intake grate. It has the Riva red exhaust system on it and I'm wondering if Riva offered two versions, (1) for the 650 and (1)...

I currently have a limited SN superjet that has a Coffman pipe, intake/single 44mm carb pkg, interchangeable head w/165psi domes, lite flywheel, aluminum water box and stock aluminum prop. Due to low speed cavitation issues upon wide open throttle acceleration I ordered both a solas I and J...

I have a 90 superjet with upgrades including 62t case and cylinder with aftermarket head. It has GroupK ported cylinder, single 44 sbn carb with Coffsman exhaust and aluminum water box. Previously had a Dale's bad attitude CDI with stock Yamaha coil. I've only ridden it a few times since...