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Front sprocket nut help

  • Thread starter Thread starter Scott
  • Start date Start date
S

Scott

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I'm trying to get the front sprocket nut off to drop the engine out of my gsx 750 S katana but just cant ive folded back the washer and cant understand why its so tough to budge it.

Ive tried lube, heat extended bars for extra leaverage but all to no avail. I'm sitting on the bike with my foot firmly on the rear brake.

It is a standard thread right? I'm trying to move it in an anti clockwise direction.


Please help.
 
You need an impact gun for those. It's good yours is so tight, mine was finger loose when I went to take it off. Scary... thank goodness for lock washers.

You don't have to stand on the brake, use a 2x4 wedged between the wheel spokes and the swingarm. I used an old wooden baseball bat and it was able to take way over 75 ft-lbs. of torque. If you live near a service garage wheel the bike over and have them take to it with an impact gun, then slip the guy a fiver. Maybe Autozone rents air compressors and impact wrenches, or good-quality electric impact wrenches. You could also try an impact driver, there are always a bunch of cheap ones on e-bay for 5 dollars or so. But that seems like it would take forever to get enough whacks in on it.

Now that you are using a piece of wood you can use something like a 10-foot breaker bar, just make sure you don't torque the bike off of the centerstand!
 
I had the same problem on mine. The solution required having a second person hold the front brake so I wouldn't torque it off the stand while I put my entire body into a 3 foot extension on a ratchet (I broke the first ratchet I tried). Once it was off, the rest was very straightforward, although it took me a few weeks since I only managed to spend 15-20 minutes on it every 3 or 4 days.
 
An impact wrench is a bad idea. If there is thread damage the impact wrench will strip the shaft entirely. You probably need to jam the rear wheel with a piece of wood or have someone else hold the brake. Once you've turned it slightly it should come off with very little resistance. If if doesn't than get it to someone who knows how to handle damaged threads. In these very high torque situations I use a 24" breaker bar situated so that I can use my foot for some pressure and tap the end of the wrench with a hammer.

I'm not totally negative on impact wrenches. They are great for speed and volume. They can however stip threads with ease. They are best used olny when you're sure you won't damage anything or can fix it easily.
 
Eh? The sudden breaking torque of an impact wrench is less likely to strip threads than the load applied through an extended wrench/socket system.
 
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