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Discussion Starter · #1 ·
So I just bought a 1991 250x with a somke problem for cheap. I figured it was the rings, not to terrible fix, right? So I ripped it apart, and found metal shavings in the screen in the bottom of hte engine. I looked, And the cam has flat spots on it. I figure while Im replacing it, upgrade it. What cam should I get? When I replace the piston and rings, Should I raise the compression? Will the enging be able to keep itself cool enough?:confused:
 

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if you have metal in your oil strainer , youll want to check the oil pump pick-up. hot cams makes an incredible aftermarket cam , and if you raise the compression , the engine wont overheat , it just wont have to work as hard
 

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I personally have a WebCam in my 250X along with a 76mm 12:1 Wiseco piston, I agree I would check the oil pump as well.
 

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i agree with the oil pump check..most cam's get flat spots on them..simply becasue they were not getting enough oil pumped to it..sooo..check your oil pump..i bet it's either bad..or dead !..lol.
 

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Discussion Starter · #5 ·
Thanks for the info! Moose, can you run just premium gas in the quad? I know it starts to get iffy when you run that high of compression. Do they make higher flow oil pumps? I cant find any.
 

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Also check the oil passages to the head could be stopped up.
 

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I run VP Racing fuel in mine but according to some piston manufacturers they recomend 108 for anything 12:1 and up and higher for larger CR pistons for optimum performance, but I do occasionally run 93 octane and it seems to run ok. As far as the high volume oil pumps I don't think there are any for our quad but to be honest you really won't need one.
 
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