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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)...

Do you have a website that I can go to to look at them?

Yes and yes. Thanks

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 separated the ebox yesterday and ohmed the stator assembly. Everything was in spec. What are the chances that the components would fail while hot and pass when cold? Engine seams to run a little bit better when cold than hot but still has weak spark at any temperature. I tried ohming the coil...

I'm new to the site how do I include him into this thread or contact him for pricing. Thanks

Ok thanks. I'll separate the electrical box box again this week and ohm it. Do you remember if you used a genuine Yamaha stator for replacement? They are about 5-6 times the cost of the aftermarket ones listed on eBay.

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...