1150 flywheel removal

[rodneya]

Trying to get the flywheel off a 1150 motor and it does not want to budge. They usually pop off after tightening the puller and giving it a bit of a whack, but this one is not interested.

How much heat can I use on the taper area without ruining the flywheel?

[Gixer1460]

If you use a good torch so you can keep the indirect heat away from the rotor and in particular the magnets / glue, a pretty much good amount of heat can be used - but heat it hot and heat it quick then stop - continual heat soaking will eventually get to the magnet glue, then its toast. I've known flywheels to take 24+hrs under extreme puller torque - patience is required!

[coombehouse]

You could try one of those freeze spray aerosols. It's a bit safer for the magnets. An induction heater would be ideal too but they are expensive 

Edited January 3, 2023 by coombehouse

[Arttu]

One trick that has worked for very stubborn flywheels is filling the puller with water and then freezing the whole thing. But naturally that's somewhat complicated with a complete engine or even a bike...

[Gixer1460]

2 hours ago, Arttu said:

One trick that has worked for very stubborn flywheels is filling the puller with water and then freezing the whole thing. 

Ingenious !, never heard about that one !, but practicality . . . . . hmmm LOL!

[gsxwill]

As said above put the puller back on and leave it under pressure, pop out every few hours give it a whack, will come eventually 

[Arttu]

11 hours ago, Gixer1460 said:

Ingenious !, never heard about that one !, but practicality . . . . . hmmm LOL!

First time I tried this was kind of desperate attempt after all "normal" tricks including non-sensible hammering and heating had failed. And it shifted the flywheel at first try. But it was a loose crank with a flywheel so it was relatively easy to pour water in and then throw the whole package into freezer. Like said, gets more complicated if the crank is attached on the bike...

[rodneya]

I have not had time to get back at it, but the puller was left on. My garage is almost cold enough to freeze water at the moment.

If I can not get it to move with more heat,  I will take the entire crank out and try the freezer thing.

[ral]

Not sure if your heating first then applying the puller, I would try fitting the puller and tightening it up before applying any heat. Use a wet cold out the freezer tea towel around the rotor to reduce heat spread, the ones I’ve done pop off without twatting the puller hard, freezer spray is also a good shout as the shock from heating to fast cooling might persuade the bugger off, good luck