Primary gear cog removal- advice needed please

[knickbee]

Hi Everyone,

Pleased to meet you!

I have used this forum a lot and have usually found what I need, but I have a problem that I cannot find the answer to. Chances are the answer is simple, the solution not so much...

I have recently picked up my first smallframe, a Malossi kitted Primavera, and I love it  However the gap between 3rd and 4th gear is too big to hold it in the power band. The primary cog is 29 tooth, and I have bought a 27 tooth replacement which by my reckoning will work fine.

However, after having a nighmare getting the clutch out (retrieval thread was stripped and woodruff key sheared and smeared- 4 hours I will never get back) I now find the small gear is also stuck on the end of the crank.

The new gear has two threaded holes for a puller, but the one on the scoot has none.

I cannot find any videos, etc of anyone putting this on or removing, but what I have found suggests it should slip on and off. 

Please could anyone confirm if this 'should' be the case?

As I thought this was suppposed to be easy, the engine is still in the frame, but TBH, other than ease of access I dont see that removing it will make much difference. There is no gap under the gear to get a lever. I've tried some heat, but again, have no lever point.

My next attempt will involve JBwelding a puller directly to the gear and seeing if the bond is stronger than the gear fit- I dont have a lot of confidence in this working, but still easier than stripping down the engine and hammering the crank through...

Even better if someone has a tip or method I can use instead 

I was going to add a pic, but got an error saying the forum has exceeded its maximum space allocation!

EDIT- seems I can add a link-

photos.app.goo.gl/VsucRQwXwtnCigVR8

-and made the subject title more polite!!

Thanks for any advice -
Cheers,
Nick






 

[jbcollier]

Hmm, I don't recall primary gear removal being much of an issue.

In oyur case, you have a replacement gear so you don't need toto save the old one. Tack weld on two nuts and use a puller to remove it.

[knickbee]

Thanks.
Unfortunately I have no welding gear, and my attempt with JBWeld was as unsuccessful as I expected...

Had to split casings in the end- but that damn stuck gear made that an absolute pig as the flyside bearing was also stuck on shaft (it had been converted to a ball, not a roller). Had to use the percussive persuader in the end. All apart now. Good I did as I've found some other problems which need fixing.

Jobs just gone from a £20 cog to ££££££

No suprise there- all part of classic scooter ownership...!