Mark III Lay Shaft play?

dirtymartini · May 31, 2015

I was out on my Mark III on Friday and made a 5 min stop. I came back out and the kickstarter wouldn't engage...it just kept slipping. I bump started and made it home. Today I had time and pulled of the outer and inner gearbox covers, The kickstarter pawl looked worn and I just replaced it a couple thousand miles ago.
I moved the layshaft around and it seems to have a lot of play...is this normal? Does this have something to do with wearing the pawl prematurely?

I took a little video of the lay shaft play. http://vid248.photobucket.com/albums/gg ... a46wcb.mp4

Torontonian · May 31, 2015

Well you probably have multiple issues. Not all pawls were/are created equal. Some break up easier than others , find a good hard one from earlier years pre- 75 is my advice for what it's worth. Once it starts slipping upon kickings then the inner cuts of 1 st gear can start to round and lose their edge to grab a bit too. Do not continue to use a slipping ratchet kick , just pull the covers and replace the pawl first. And plunger spring. Also if/when you do this you should consider the roller layshaft conversion.

dirtymartini · May 31, 2015

Torontonian said:
Also if/when you do this you should consider the roller layshaft conversion.

I have heard this said before...can you point me to more info?

Torontonian · May 31, 2015

Try the search feature upper right corner of the page. The bearing you need is NJ 203 E (C3) . Heat the box to get the old one out then drop in the frozen new one into the hot box.

batrider · Jun 1, 2015

Hi Paul -

I found this link helpful when doing mine 2 years ago: http://www.doov.com/apps/nortoncompanio ... ng-upgrade.

(I didn't go with the roller but went with the Mick Hemmings TB ball bearing. )

Did you replace the layshaft bushing in the K/S shaft also?

Russ

dirtymartini · Jun 1, 2015

batrider said:
Hi Paul -

I found this link helpful when doing mine 2 years ago: http://www.doov.com/apps/nortoncompanio ... ng-upgrade.

(I didn't go with the roller but went with the Mick Hemmings TB ball bearing. )

Did you replace the layshaft bushing in the K/S shaft also?

Russ

Thanks Russ! Looks like just the info I need...as long as I am this far I am as well do the upgrade.

Torontonian · Jun 1, 2015

There's no need to replace the timing side layshaft bush. Most of the acceleration/ decelleration forces involved are on the drive side and that's where a quality bearing is needed. :!:

batrider · Jun 1, 2015

Torontonian said:
There's no need to replace the timing side layshaft bush. Most of the acceleration/ decelleration forces involved are on the drive side and that's where a quality bearing is needed. :!:

Well it's your choice whether to do a half-assed job or not. It should at least be looked at carefully.

Torontonian · Jun 1, 2015

That's half-assed ? I suppose you fitted a new bush when you did yours or even a needle type roller :roll:

batrider · Jun 1, 2015

My TS layshaft bushing was worn (sloppy on the layshaft) so I replaced it with a new one. It isn't easy to get the old one out. Had to tap it inside and make a nut and bolt puller to get it out. I just figure the layshaft should have all the support it can get. There are a lot of opportunities for slop on the kickstart side.

You are kind of saying don't worry about it. Sorry I'm a little grumpy this AM.

Torontonian · Jun 1, 2015

Instantly forgiven. I'm well aware that removing that bush is so difficult that few owners actually do it. :shock:

dirtymartini · Jun 2, 2015

I found a Superblend roller bearing at Old Britt's for $73 and at British Cycle Supply a Roller bearing for $48.96 Neither on give much info about the bearing.

Mark III Lay Shaft play?

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