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My son has a 89 550 which he picked up as a poor running project. We did a top and bottom rebuild on the motor and just put on a new 44 SBN. The add on's are OP head, Coffman half pipe, West Coast waterbox, OP intake and the 44 SBN I mentioned. The compression is an equal 150 lbs. Let me say...

I had posted this in the 550 section without any replies. We were hoping to order our SBN right away and were hoping to have a better understanding of what we need before we order it. We're looking at adding a Mikuni SBN to our 89 JS550 which currently has the BN. We just can't get that BN to...

We're looking at adding a Mikuni SBN to our 89 JS550 which currently has the BN. We just can't get that BN to tune no matter how much we tinker with it and we want some more reliability. The motor has a fresh complete rebuild. The ski has the following mods. Ocean Pro head Ocean Pro intake...

I had previously posted this in the 550 area but got no response and very few views. I'm hoping someone in the General area can guide me a bit. Thanks, My son saved up his money and bought a real nice 86 550. The motor had been previously built up. It has a Ocean Pro head (my previous post I...

My son saved up his money and bought a real nice 86 550. The motor had been previously built up. It has a Westcoast head, Coffman half pipe, Westcoast waterbox, aftermarket intake (unknown brand), as well as all the handling goodies (plate, grate, etc etc...). The carb is a BN44 We just had the...

We just picked up the ski from the engine rebuilder yesterday and were heading north in a few hours. As we were re-assembling this morning we find that were missing the exhaust gasket for the "U" shaped exhaust pipe which runs from the manifold to the upper pipe. I contacted the builder and he...

After a complete rebuild (including new needles) the carb on our 95 750sx just won't tune. I think the L needle seat may have been damaged during the rebuild which may account for the inability to get it to run properly. I'm leaning toward scrapping the original carb and replacing it with...