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I did my homework. Found a thread on here that said the oil plug threads for a 87 trx250r should be m14x1.25. I ordered a plug for my wheeler and it didn’t fit. Mine is smaller. I also tried a m12. Didn’t fit. I don’t have any taps that size otherwise I would have tried running a tap through it to determine the size. Any ideas what size plug I need to get? I wouldn’t be going through all this trouble but my wheeler didn’t have an oil plug in it when I bought it. Thanks for any help.
 

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I did my homework. Found a thread on here that said the oil plug threads for a 87 trx250r should be m14x1.25. I ordered a plug for my wheeler and it didn’t fit. Mine is smaller. I also tried a m12. Didn’t fit. I don’t have any taps that size otherwise I would have tried running a tap through it to determine the size. Any ideas what size plug I need to get? I wouldn’t be going through all this trouble but my wheeler didn’t have an oil plug in it when I bought it. Thanks for any help.
Just a thought, but someone could of drilled and tapped it to a different size completely.
 

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Just a thought, but someone could of drilled and tapped it to a different size completely.
That’s what I guessed. But the stock plug is supposed to be a m14. The Hole I have is smaller than a m14 and larger than a m12. There is no sign of an insert or heliecoil so I don’t know why my drain hole is smaller?
 

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That’s what I guessed. But the stock plug is supposed to be a m14. The Hole I have is smaller than a m14 and larger than a m12. There is no sign of an insert or heliecoil so I don’t know why my drain hole is smaller?
I'd grab my "can o bolts" lol , and start trying till I find a perfect fit. Then if need be go to the parts/hardware store or whatever and get the proper bolt and crush washer.
Again just a thought..
I don't know the exact size of the factory drain plug, but if needed I can pull ming tomorrow and report that size in the morning.
 

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I'd grab my "can o bolts" lol , and start trying till I find a perfect fit. Then if need be go to the parts/hardware store or whatever and get the proper bolt and crush washer.
Again just a thought..
I don't know the exact size of the factory drain plug, but if needed I can pull ming tomorrow and report that size in the morning.
If nobody else chimes in that would be much appreciated. I tried my spare bolts couldn’t find the right one. Going to try a buddies set of bolts tomorrow if I can’t find the right size on here.
 

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is it possible that your cases were welded? just a thought because when i had mine welded Arlan put in a smaller hole. but that would be pretty obvious other than that i got no idea
 

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is it possible that your cases were welded? just a thought because when i had mine welded Arlan put in a smaller hole. but that would be pretty obvious other than that i got no idea
If it was welded the person did a hell of a job. No there’s no paint that looks out of place. No sign of it being welded.
 
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