I'd be grateful for advice please on what pullers/special tools are needed to replace the crank seals on a 1978 Bultaco 199a.

Edited October 30, 20232 yr by 340bulltaco
wrong number

17 hours ago, 340bulltaco said:

I'd be grateful for advice please on what pullers/special tools are needed to replace the crank seals on a 1978 Bultaco 199a.

Magneto side requires a puller for the magneto flywheel. The magneto flywheel will have ID on it so you will be able to buy the right puller.

The drive side seal requires you to take the clutch off and to get to the clutch nut, you may need a clutch spring tool if you have the spring pins that have a cross-pin retainer. If you have threaded clutch spring posts then you wont need any special tool to get to the clutch nut. The clutch nut is 22mm (from memory) and requires a thin-wall socket because the nut is recessed. I machined the OD of a standard 22mm socket down for this.

To unto the crankshaft drive sprocket nut it is helpful but not totally necessary to have a clutch holding tool. This sprocket is on a parallel shaft with key drive. It may need a puller to get it off. A standard industrial two leg or three leg puller will do for that. The clutch basket and crankshaft sprocket come off together with the primary chain in place.

Bultaco clutch holding tool (helpful if the motor is out of the bike)

Bultaco clutch spring tool (unlikely needed on a 199A)

Thin wall 22mm socket (definite)

Large two or three leg puller (maybe)

Bultaco magneto flywheel puller (definite)

 

Very many thanks feetupfun. Sorry for late reply, I had a quite bad reaction to this years covid/flu combuined jag.☹️