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YFZCentral > :::General Discussion::: > Other Yamaha quads!
YFZS=MYBABY
So my little bro who is 12 got a blaster this past summer and we have already had to rebuild it 2 times. And now just the last time we rode it, (first 4 hours of second rebuild) it made a weird noise in the engine and stalled when he was going up the hill. It would barely idle. Then brought it home started it up and it idled fine. I really hope the engine isn't blown again but what does it seem like it is. I know I didn't specify to good but based on your knowledge. I know it's a 2 stroke but it seems to have a lot of blueish smoke out the pipe. Is that too rich you think? let me know. And then if so do I change the main jet? 1 clip? or what exactly do you do again to make it run more lean or rich?

let me know what you guys thinks

thanks
YFZS=MYBABY
QUOTE (YFZracer61 @ Apr 3 2009, 10:57 PM) *


whoops my bad dude I forgot there was a other yamaha quads section
08yfz45031
well if your blowing motors like that take it to a shop to get rebuilt or somewhere else cause your not doing something right, second maybe he rides the clutch or over revs it. i beat my blasters and they lasted, and when i say beat im talking i did whatever to get where ever(over rev, ride the clutch, no clutch shifts) and it still lasted
cwright#26
Yeah somethings not right, just take it to a shop. I've had mine since the winter of '02, raced it for 3 years and absolutely beat the living hell out of it everytime I rode it and it blew up once. It was a highly modded engine too. What oil have you been using (including crankcase)? Is the oil injector still intact or are you premixing?
masterbaeten
if its the first 4 hours of a rebuild you should really think of breaking it in first lol. did the motor get hot? it could have siezed the piston, mine did that in pismo after riding it for a few hours
08yfz45031
theres no such thing as a break in time on blasters, my buddy used to put pistons in and then go out and run a race. and the bike would go forever
06yfzvc
check to see if your reeds are ok might have broken one
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