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This is my js300. You might have seen it in my previous posts. It had always had one of those rock and roll type motors that when running look like they are ready to jump off the motor mounts. The bad vibrations were due mostly to the little end of the rod being a bit worn out and having some...

I set out to do the stock waterbox modd for my 300 but gave up when i measured the cast outlet pipe and found that the internal diameter was only 34mm. The carb is a 38mm the exhaust manifold outlet is 38mm and the end of the kerker pipe is 38mm and also the inside diameter for the inlet pipe to...

Here are some pictures of the 300 i have just finished putting together. Im running a bn38 at the moment which went really good with the stock pipe but now after i put the kerker pipe on it seems to be running too lean. I have just drilled the main jet out by .1mm but havn't tested it yet. Has...

I have a js300 with almost every bolt on accessory available for them. I love these skis so much just to spite the haters really. At the moment im running a bn38 on my 300. I have a sbn38 that I would prefer to run but cant seem to get the jetting right. Has anyone ever had any luck with...