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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Gearbox Problem 1950 Twin
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<blockquote data-quote="greg brillus" data-source="post: 36976" data-attributes="member: 597"><p>I am going to have a stab in the dark and say that....possibly what may have happened is....uppon removing and changing/ replacing the G40 shaft, on the earlier engines ( not sure when this changed ) the bevel gear G39 AS in the roof of the gearbox had a piece of tube brazed to the outer right hand end of it, which you can see in the parts book page M 003. I have found on some engines that this tube has come loose and on odd occasions it ends up in the bottom of the gearbox where it doesn't seem to do no harm, this holds the G40 shaft in place, but can fall out if the shaft is removed, it is better to replace the early G40 shaft with the far better later type with a pin on its inner end to locate in the hole in the middle of the G39 AS bevel gear.....i'm wondering if in your case, the piece of tube has landed on top of the gear cluster, and is causing the problem you are having, perhaps it's jamming the camplate/ selector forks etc. I would pull out the G40 shaft and have a good look down the hole....perhaps find a magnet that will fit through the hole and see if you can pick it up, and shift it to a place where..as i said earlier it will do no harm untill the day you open the box and remove it....sounds extreme, but highly possible...Cheers for now....Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 36976, member: 597"] I am going to have a stab in the dark and say that....possibly what may have happened is....uppon removing and changing/ replacing the G40 shaft, on the earlier engines ( not sure when this changed ) the bevel gear G39 AS in the roof of the gearbox had a piece of tube brazed to the outer right hand end of it, which you can see in the parts book page M 003. I have found on some engines that this tube has come loose and on odd occasions it ends up in the bottom of the gearbox where it doesn't seem to do no harm, this holds the G40 shaft in place, but can fall out if the shaft is removed, it is better to replace the early G40 shaft with the far better later type with a pin on its inner end to locate in the hole in the middle of the G39 AS bevel gear.....i'm wondering if in your case, the piece of tube has landed on top of the gear cluster, and is causing the problem you are having, perhaps it's jamming the camplate/ selector forks etc. I would pull out the G40 shaft and have a good look down the hole....perhaps find a magnet that will fit through the hole and see if you can pick it up, and shift it to a place where..as i said earlier it will do no harm untill the day you open the box and remove it....sounds extreme, but highly possible...Cheers for now....Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Gearbox Problem 1950 Twin
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