Countershaft Nut Stuck

I have an 03 YZ450 and want to put a new front sprocket on. Problem is I cannot get the damn nut off. I assume (probably my first mistake) that it is not reverse threaded. I also assume that it is probably a bad place to apply heat. I've tried all I know to do. You guys have any ideas?

The nut is a normal, right hand thread. If you don't have access to an impact wrench, try putting the bike in a higher gear with the chain still on, and place a piece of wood or a hammer handle across the swing arm through the wheel spokes, as close to the rim as possible. Then crank away with a good fitting socket on a long breaker bar.

I put my foot on the rear brake as well

Use the above mentioned methods to retorque, but get your hands on an impact to take that thing off.

You can use a small amout of heat too. Just don't get carried away, you don't want to melt the countershaft seal.

I put my foot on the rear brake as well

Damn you are much more flexible than I am! :devil: Good idea - I have done that as well. I usually have my son or wife stand on the brakes and jam a wrench wrapped with a rag between the chain and sprocket. I would be very leary about torquing it in gear. Just me.

Thanks guys, I had my son standing on the brake and had it in gear, with a breaker bar on the socket wrench and it still would eventually push the sprocket forward. I'll give a go with some of your suggestions.

Thanks guys, I had my son standing on the brake and had it in gear, with a breaker bar on the socket wrench and it still would eventually push the sprocket forward. I'll give a go with some of your suggestions.

You did push the lock washer down didn't you?

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