engine problems

yamaha blaster

New Member
Jun 15, 2008
1,193
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Michigan
So this weekend we went to out cabin and I was messing around in a swamp in 1st gear barley on the throttle and I am getting a knock sound coming from the engine. Hmmmmmmmm what could it be let me know. Oh ya it stayed when I would rev it up.
 
could be that.. mine makes one to but it has been doing it since day 1 after my rebuild.. how long has it been since your rebuild?
 
I drove it today a few times around the yard and it didn't do it so if it does it again I guess I will just have to tear the motor down.