HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
yamasaki

06 yz450f countersprocket.. how-to remove?

23 posts in this topic

i know, it's a silly question. did i just forget? i'm replacing my chain/sprockets and i just can't get the countersprocket to budge. i didnt want to start applying insane amounts of pressure or put the torch to it to start heating it up just yet.

my manual doesnt say anything about it being reverse threaded or anything in particular about removing it. do i just need to apply more pressure?

i've still got the chain/sprockets on the bike, i was just trying to loosen the front countersprocket before removing the chain/rear wheel. i put a large screwdriver between the rear sprocket/swingarm.

i'm almost embarrassed to post this.. but, figured better to ask before really doing some damage..

i was riding yesterday and felt my bike make a weird jump/skip coming out of a corner.. i thought it was about to pop out of gear or something. i got off the track and we saw this... looks like i somehow ripped off a few teeth of the rear..

sprocketb.jpg

Share this post


Link to post
Share on other sites

Put the bike in 4th or 5th gear, and place a board across the swing arm, through the spokes, so it lays across both sides of the arm as near the rim as possible. Then crank the sprocket off. It's a right hand thread, so turn it counter-clockwise to loosen.

Share this post


Link to post
Share on other sites
Impact gun.

Definitely the impact gun. You should know somebody that has one if you don't. Perhaps if your on good terms with a local dealership one of the mechanics could blast it off real quick for you..Only takes a second. On some countershaft sprockets i have tried to remove, like a couple WR's that were ridden in BAJA <Salt water> along the beach............An impact and PB blaster and heat were required.

Share this post


Link to post
Share on other sites

You really should replace the sprockets before they get that worn. Your losing a lot of hp with worn sprockets like those.

Share this post


Link to post
Share on other sites

I had the same problem - the factory must have a sumo wrestler put them on. Don't put anything through the spokes - you'll bend them - take it from me. Use a strong air impact and even still it won't be easy.

Also - when removing the rear sprocket - use a hex head wrench only to hold the sprocket. Use a box-end wrench to loosen and remove the nut from behind the sprocket. You'll never turn (loosen) the sprocket bolt with the hex head - only ruin it.

Share this post


Link to post
Share on other sites

ok, good responses... just popped back on here to update... lol

first things first.. it is NOT reverse threaded!!! mine came off counter-clockwise!! this was after i finally was able to make it budge (clockwise) using my breaker bar. i'm glad i 2nd guessed that instead of continuing to tighten it.

i used a little 1/2" rachet + 30mm socket + pipe homemade contraption.. just using constant pressue, nothing too crazy.. i was pushing hard consistently, but not jerking it or freaking out.

breakerbar.JPG

Share this post


Link to post
Share on other sites
I had the same problem - the factory must have a sumo wrestler put them on.

for real!!!

also, no way i was putting anything through my spokes.. i used a big fat screwdriver jammed in the sprocket butted up against the swingarm

Share this post


Link to post
Share on other sites

Air gun is the easiest way IMHO. If you've got a strong one and good air supply you can leave the bike in neutral and the shock from the gun alone should pop it right off.

Share this post


Link to post
Share on other sites
Air gun is the easiest way IMHO. If you've got a strong one and good air supply you can leave the bike in neutral and the shock from the gun alone should pop it right off.
It will, indeed, and that's what I do when at home. Don't need the bike in gear, or anything.

But trust me on the board through the spokes thing. You do it in 5th like I said, with the board all the way up against the rim, works perfectly.

Share this post


Link to post
Share on other sites

i have a mickey mouse compressor, a hose rated for 90psi, and no impact gun, so i had to mcgyver it. :excuseme:

one day i'll have nicer tools.. i swear!! :confused:

Share this post


Link to post
Share on other sites

90 psi is workable, the key is big fat air hose (1/2" ID), big fat quick connects and a good wrench. :confused:

Share this post


Link to post
Share on other sites

in my manual if you have someone to help you it says to drop the rear tyre on the ground (if you have it on the stand) put foot on rear brake and do your thing.... cant see it possible doing it by yourself though.

Share this post


Link to post
Share on other sites
in my manual if you have someone to help you it says to drop the rear tyre on the ground (if you have it on the stand) put foot on rear brake and do your thing.... cant see it possible doing it by yourself though.

i tried that, with the amount of pressure needed, there was no way. the wheel would still skip, even on the ground with the brake pedal mashed hard.

i'm telling you, this thing was ON THERE.

when i took my cylinder off my '06 i noticed the same thing, no way it was torqued to spec, they had the same sumo guy crank down the head/cylinder bolts too. maybe this is yamaha 's secret to reliability? screw the manual! theyre using german specs for all their bolts "gutandtight"

Share this post


Link to post
Share on other sites

there are several ways to get the CS off - you found one, Grey has another, others use impact wrenchs and I have my own method (Top Secret).....more importantly, please tell me you are replacing both sprockets and chain as a group.......:confused:

Share this post


Link to post
Share on other sites
please tell me you are replacing both sprockets and chain as a group.......:confused:

why? the rear is fine. i'm gonna change the front sprocket with a new one, and i still have the stock chain i took off after having the bike for a month, i think it'll be a sweet setup!

Share this post


Link to post
Share on other sites
why? the rear is fine. i'm gonna change the front sprocket with a new one, and i still have the stock chain i took off after having the bike for a month, i think it'll be a sweet setup!

the rear looks great my friend, keep telling yourself this.....then

not the way most of us would do it

the stock chain is junk

any sprocket wear will ruin any new chain:naughty:

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0