Alright. I'm not a newby to using tools, but I sure feel like one.

I'm going to try a 15 tooth front sproket to increase my acceleration as well as to see if it will move the "dead zone" I sometimes have between 2nd and 3rd gear while riding some trails. I don't like reving it so high in 2nd, but 3rd just dosent have quite the punch I want to keep up with my mototcycle friends.

I flattened out the lock ring on the nut, and attached a 1 1/2 foot long 1/2" breaker bar. Parking break is on, wheel chocks under all wheels, and it's in 1st gear. For the life of me, that nut would not come off. I borrowed my friends dual hammer, 350lbs torque, 1/2" impact wrench, and the nut still won't budge. While protecting the chain with a wet rag, I alternated heating and cooling the nut a couple of times with a propane torch. I warmed up the nut and melted in some candle wax, hoping it would seep into the threads. I also have tapped on the nut many times with a hammer in hopes of loosening any built up rust (not much, as the bike has lived in AZ it's whole life) After all this, I considered it might be reverse threads, but the maintenance manual did not point this out. I alternated loosening and tightening with the impact multiple times (the last time, it made the air adjustment screw fall out of my carb and I had the search around for all the parts!)

I've got PB Blaster soaking on it overnight, so we will see if that helps. I contenplated wedging the breaker bar up against the foot peg, me holding on to the socket, and my son starting it up and slipping the clutch to see if that might do it, but better judgement prevailed and I decided not to risk his life....

It looks to be the origional 16 tooth sproket. A foolish previous owner might have taken it off and mistakenly put red loctite on it (it takes 500 deg F heat to remove it!)

I'm not against cutting the nut off with a dremel tool, but I want that to be the last measure. I'm assuming the nut is a standard metric thread like a M16 x 2, but I won't know until i get it off.

Any other suggestions?

 

just use a nut splitter and crack it off- should be able to pick up a new nut on the cheap at any cycle parts supply. nothing is worse then wasting a day trying to remove a stupid nut!

 

Cheap nut splitters don't work, and good nut splitters are not cheap. That's a M20 nut (30mm or 1.2 inches across the flats). I'm finding nut splitters online for $150+. Only two times in my life I could have use one that big, and last time was 15 years ago. I think I just use an air cutoff wheel and a Dremel.

 

goto town and have a shop zip it off with a 3/4 " gun with a good air supply.... its standard thread not reverse... also look it might have a few spots of the lockwasher bent onto the nut. Im guessing this is on a ds650?

 

It is for a DS650. I only see one side of the lock washer that has been folded down. I think I will take it to a shop. Much easier that cutting it off.