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It fires up and runs but seems to want to slowly continuously accelerate and within moments there's a knocking but not regular enough to be the chain. The knocking is there when not running but peddling and as sun as you cut it off the chain Seizes. It is also backfiring some. Best way I can...

Appreciate I actually am using the trufuel pre mix at the 50:1 ratio. Especially after I drained the tank from sitting and replaced the fuel lines and filter.

It runs on mix and I can't find any where to add oil or a reserve. Under a friends suggestion I've been running it at a 50:1 ratio. I get its not good, just not sure how the issues might be related and how to diagnosis and fix it. The chain was loose but I fixed the tension and the issue is...

Hi my name is Chris, I just got back my 80cc gas powered bike. It ran fine when I last had it but sat for a year. I drained the tank, replaced fuel lines and filter. Lubed chains and cables, as well as checked the spark plug. It fires up fine and runs but there's a knocking in the engine and...