3 replies [Last post]
Grant R26
Grant R26's picture
 Offline
VBMWMO #8145
Toronto Canada and Long Island, Nova Scotia
Joined: 03/28/2011
Posts: 178

My buddy Tonis has just acquired his first “vintage bike”. He had the good judgement to buy a very nicely kept R27.

We got it started today but I noticed an odd quirk with the kick start. If allowed it to return to the very top of its travel the kickstart pedal would often lock very solidly in place.

With my various R26, R27 bikes and R51 I do find when right on compression I don’t have the power to get the pedal moving….and pulling in the clutch and dropping the kick start an inch changes the leverage and it swings through easily.
But this is a very different feel. It is absolutely locked in place. It takes a two or three tweaks of the clutch alternating with foot pressure to jiggle the kick-start pedal out of this locked position. Then it works normally for two or three kicks before it locks up again… if I allow it return to the top of its swing.

Tonis is taller than me and found it locked up almost every kick.

Everything else feels normal and it appears to shift through gears though we have not done a road test yet.

What might be the problem here ? I’ve got a bad feeling this means the first tooth or two of the kick-start segment is worn or chipped allowing it to lock to the idler gear.

For the short term he can start this bike provided he does not let the pedal return all the way to the top. If Tonis is willing to put up with this locking-up problem is there any reason why he needs to fix it immediately or can he enjoy the bike for a while first ?

Any insight as to what might be the issue would be gratefully received.

Thanks !
Grant MacNeill
Toronto.

Twocams
Twocams's picture
 Offline
VBMWMO #8750
Joined: 03/16/2014
Posts: 698
I had the same problem with

I had the same problem with my R69S when I first got it. It would lock up and I played with it. It hasnt locked up for ages (knock on wood).
The only thing I did was put a new rubber stop on the frame under the kick peddle. I guess that made the kicker not travel down so far.
Not sure if this was the problem....but Ill blame it on the rubber stopper anyway.

twocams

__________________

Twocams
69 R69S 03 K1200GT
92 R100RT

comet
comet's picture
 Offline
VBMWMO #33
Joined: 10/27/2006
Posts: 160
You are correct, it's an

You are correct, it's an expensive fix. The kick start quadrant has a small piece of spring steel on the end that acts as a locater to align the starting gear. If this piece is worn or bent the gear teeth will not mesh properly. The top of one gear hits the top of the other gear and stops. I don't know of any fix for this problem other than replacing the entire quadrant gear. You can learn to live with it, nothing will break or wear out because of this. It is very irritating.

Grant R26
Grant R26's picture
 Offline
VBMWMO #8145
Toronto Canada and Long Island, Nova Scotia
Joined: 03/28/2011
Posts: 178
yes, I've looked at the parts

yes, I've looked at the parts diagram and see exactly what you are talking about. The worn first tooth must be perched on top of a tooth on the idler gear which explains why it feels so solid when locked.

I'll suggest to Tonis that he just put up with it for the time being. I see now that it should not cause damage to anything else in the gearbox.

I suspect that the local company we use for resurfacing cams and valve lifters could easily build up a little metal on that last tooth and re-contour. Probably FAR cheaper than buying a new quadrant (quadrant segment)

thanks for the help

Grant

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.