Blown Blaster

[TWIZDdirtRIDER]

my blaster blew up, i pulled it apart and its all white insode (normal signs of over heating) but the piston is still oiled. did it just over heat and blow, or did my oil injection go?

[Snafoow]

White usually means too much air. Should be brown inside. May have run lean on fuel and over heated.

[tattoo]

I had an 87 blaster and it fried a few pistons before I realized that the oil injection didnt work anymore. I would make sure before you spend more money.

[toofast4uu]

Take the injector off...They are worthless...Just premix the fuel....32:1....it's very simple, and you'll never have to worry again.

I have a cylinder and hed if you need one...

[rpyfz450]

Originally posted by TWIZDdirtRIDER@Apr 18 2005, 09:00 PM
i pulled it apart and its all white insode (normal signs of over heating) but the piston is still oiled. did it just over heat and blow, or did my oil injection go?
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If your cylinder liner is mirror glazed and it's dusty in there, it sounds like a lubrication problem. It's possible you have oil on the piston crown since poor lubrication doesn't raise combustion temps quite like a lean condition would. A lean fuel condition would have likely done a better job of burning oil off the piston and melted it's exhaust edge or even "holed" the piston crown.

If this engine was very recently rebuilt, then you may have a problem with not enough piston clearance when the cylinder was bored.

Converting to premix could potentially cause your ATV to run slightly leaner because you're now displacing 1/32nd of your fuel with oil. I've only performed one OI-to-Premix converison and in that circumstance I was simultaneously changing to a new carburetor and starting all new on the jetting. I never had "before" premix jets to compare with. I would tend to think you probably don't need to worry much about this since the 1/32nd

[TWIZDdirtRIDER]

im not premixin it, i rather buy a new injector, if i have to pre mix then it becomes a pain in my ass, and i can't roll right up to the gas station where i ride and fill it up.

[toofast4uu]

I have an injector pump...$20 and it's yours....

[rpyfz450]

Originally posted by TWIZDdirtRIDER@Apr 19 2005, 06:04 PM
im not premixin it, i rather buy a new injector, if i have to pre mix then it becomes a pain in my ass, and i can't roll right up to the gas station where i ride and fill it up.
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You should test your oil injectin pump to ensure that's what failed. I';ve done this many times before using a reversable cordless drill to run the pump.

[TWIZDdirtRIDER]

im gonna try that, if i don't work, i want that pump lol