G80 CP Burman mainshaft problem
Posted: Fri Nov 17, 2017 4:23 pm
I got the '47 G80 fired up today after its rebuild, despite our garage having been demolished and not yet rebuilt.
A crisp and easy start up and tickover settled down nicely, I thought I'd check gear selection before going out for a short trial run.
But then, "Where has the cluch action gone?"
An unbelievable amont of slack has suddenly appeared in the operating mechanism and I was imagining that the clutch actuating lever's pivot pin could be broken.
Particularly as its a grease lubed gearbox, I was a little shy of popping the outer cover off the gearbox to see, with no roof over its head, no work bench and only limited tools as most have been stored away until the new garage is up. But it was a nice sunny day so "au plein air" with an ex army catering tray to catch the drips, I got cracking.
Amid the dollops of semi fluid grease I was surprised to find the operating lever and its pivot all in order. But then amongst the grease, behind the kickstart quadrant, "Whats that?"
The clutch operating plunger and ball bearing, the kick start ratchet, retaining collar and nut lying where they should not be.
Once the gease was mopped up I tried refitting them. This went well, excepth that only two and a half threads of the mainshaft end protruded and the nut did not easily thread onto it.
Over a cup of tea to consider, I conclude that some previous owner sheared the end of the shaft, leaving just a few threads and put the nut back, hoping it would do. The surprizing thing is that it has been ridden quite a bit in this state, and held together just long enough for me to start it today.
If anybody knows better and can explain that its Ok to have so few threads for the nut, I'll be glad to hear.
I do have spare, later oil filled box, but that is buried in a box deep among other boxes in a confined space until the new, super dooper garage is available, and until then I have nowhere to check that box and make sure it has no secret horrors of its own.
A crisp and easy start up and tickover settled down nicely, I thought I'd check gear selection before going out for a short trial run.
But then, "Where has the cluch action gone?"
An unbelievable amont of slack has suddenly appeared in the operating mechanism and I was imagining that the clutch actuating lever's pivot pin could be broken.
Particularly as its a grease lubed gearbox, I was a little shy of popping the outer cover off the gearbox to see, with no roof over its head, no work bench and only limited tools as most have been stored away until the new garage is up. But it was a nice sunny day so "au plein air" with an ex army catering tray to catch the drips, I got cracking.
Amid the dollops of semi fluid grease I was surprised to find the operating lever and its pivot all in order. But then amongst the grease, behind the kickstart quadrant, "Whats that?"
The clutch operating plunger and ball bearing, the kick start ratchet, retaining collar and nut lying where they should not be.
Once the gease was mopped up I tried refitting them. This went well, excepth that only two and a half threads of the mainshaft end protruded and the nut did not easily thread onto it.
Over a cup of tea to consider, I conclude that some previous owner sheared the end of the shaft, leaving just a few threads and put the nut back, hoping it would do. The surprizing thing is that it has been ridden quite a bit in this state, and held together just long enough for me to start it today.
If anybody knows better and can explain that its Ok to have so few threads for the nut, I'll be glad to hear.
I do have spare, later oil filled box, but that is buried in a box deep among other boxes in a confined space until the new, super dooper garage is available, and until then I have nowhere to check that box and make sure it has no secret horrors of its own.