Hi all,
Recently my M21 is skipping his 3rd gear and going directly from 2nd to 4th gear.
Any idea what might be causing this problem?
And can i adjust it somehow?
At my BSA A10 there's a indent plunger underneath the gearbox which allows me to adjust the gear setting. Bust on my M21 there isn't a adjustment like that.
Kind regards,
Nick
Hi P J
Your M20 gearbox has a different shifter mechanism from your A10. On the M20 gearbox there is an adjustable length link arm, but you need to remove the outer gearbox cover to get access. Service Sheet 306 fig B12 is a view with the outer cover removed showing the link arm.
However, I had a similar problem getting into 3rd gear on my B33 which has the same gearbox. Adjusting the link arm was not successful. I had to replace the 3rd/4th gear dogged wheel and the associated shifter fork had to have a weld repair and remachining on the faces.
Service Sheet 608 covers the disassembly and assembly. I didn't remove the gearbox from the frame to do this work.
Jim
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