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Yeah, I re-read your first post about Yamaha Blasters being noise machines and wanted to double check my suspicions. Now that it's confirmed I'm not going to start it until I fix the problem.

Wow never though of all of that. Makes sense though. So I just ran it real quick to make sure I was hearing it right. At idle I can't hear any knocking but when I get it revving high for a few seconds is when I hear a knocking. It isn't consistent one after another, it's more of every 5-10...

Ok great, I really appreciate the help. I won't run it until I get that test done and I will try to ask the previous owner for any other mods.

I don't believe the carb has been jetted. I recently purchased the ATV about a week ago so my information is limited. Foam Filter: Should I replace the size of the jets for the foam filter? I will open it up today and see if I can get a brand/model of the filter Leak Down Test: I just ordered...

Just did some searching and I will be getting a kit. What are signs to look for when determining the bore. And if I need to bore the cylinder, how much does that go for?

Hello, This is my first time owning an ATV personally. Growing up I had a dirtbike and a 350 Rancher atv, but my father did most of the maintenance on them. I've never had a 2-stroke ATV before and noticed some noise coming from the engine and would love if anyone had an idea if it is piston...