Hey guys,

I over torqued the sight hole flange bolt for the clutch oil on a 2011 Honda CRF 250R and stripped the threads on the crank case......not the bolt      

Any ideas to reinforce my thoughts would be greatly appreciated. I really don't want to take it out of service or pay for a new crank case cover.

I am thinking heli-coil, or tap it and use a 5/16 ( it is a 6M ), I don't want to go 7M or 8M because I think it will affect the correct level of oil.

Will aluminum filings get in the crank if i tap it and damage my clutch ?

Any better Ideas

Thanks

remove it and heli coil it, ive done a bunch and had zero problems. some people say no to helicoils, but they have been good to be

just do the heli coil they work great and next time use an in/lb torque wrench or something dont kill the bolt lol

Edited by Chris Hammer, 03 May 2012 - 07:11 PM.

Chris Hammer, on 03 May 2012 - 07:11 PM, said:

I was using in/lbs.....had it set on 11 instead of 9 on hot aluminum and she just turned right around. Gonna turn it in by hand next time till it's snug and just change out the washers more frequently.

Anyhow, thanks guys for the advice. Such a small shitty little problem that has kept me off the track for days over something so stupid. One little bolt hole. Gonna tap it to 1/4 for a quick fix then use the heli coil when it comes in. ( had to order one ).

Thumper35, on 03 May 2012 - 08:20 PM, said:

Got yah....its happened to me before too...thankfully just not on either of my bikes.

How about this. Don't use the friggin' check hole. If you have any doubt about the oil level, drain and refill it with the correct amount. Problem permanently solved. You ought to be changing the oil often anyways.

I do change it often and i do measure out the correct amount in a measuring cup. I have been experimenting. On the wheels and on the stand. Had the valves checked and the mechanic said it was too full, this was filled to the recommended amount from the shop manual. SOO, i use the sight window.

So overfill it 50cc's or so. The clutch will run cooler with the additional oil. Plus you don't have to worry about stripping the hole. Look at the bikes with a sight window. They have a oil height variance of almost 1/2" and still be within specs. Why does it have to be within 5mm?