There seems to be very little discussion on Burman gearboxes in MPH or this forum and very little in FYO/KTB/Richardson etc...... I'm too stingy to have purchased ATY yet and try and utilise my failing memory of MPH technical articles which are now getting very scarce and intermittant. I thought I would share (for posterity) some of my recent Burman gearbox practice.
My Comet assembly was coming along well until I hit more problems with the gearbox during the last few days.
After Charlie Cannon's problems in France in 2006 (rescued by a very talanted Comet rider from Germany) when his Burman outer cover worked loose I decided to do a thorough overhaul pending my European planned rides this year on my new machine. I replaced all the studs (per KTB) with threads for the nuts changed to BSF and had a bit of welding done to repair some stripped studes. I also fitted a sealed bearing from Peter Barker. With minimal trouble I reassembled it over the winter.
It joined my beautifully restored engine (carried out by Maughan's on time and on budget) with a cleaned out UFM (thanks Andy) and the front and back wheels.
Chains all nicely adjusted (clutch looks a little wonky though) and I tried changing gear..... it worked ok on the bench but not now. I had repalaced the cracked mezac spring box with a new one from VOCSC after a second hand one from a Matchless spares company proved faulty. I put in the stronger springs from this latter one..... I found they seemed to pop out when changing gear so had to put the old smaller gauge ones (rather knackered as well) back...... what a palava putting the spring mechanism back ......grovelling a round on the floor (must invest in a stand one day)..... grease all over the place and no Vintech Wellseal this time!
Then I found the nut, just behind the selector knurled axle, loose..... anyone know what this does (it is unclear from the drawings)??.....anyway I tightened it up and it all works...... I did not want to remove the cover for the umpteenth time!
Has anyone else experienced problems with the selector springs popping out......is there a mod? Cannot find anything in the literature. Thanks in anticipation for any advice.
Vic
PS On the plus side I now feel confident I could compete with my old colleague from Germany when assembling a Burman gearbox and kick start spring!!
PPS Oh I forgot to mention that I left out the push rod ball bearing and had to take the cover off again..... more lost grease and oil!! Then the push rod was too short and even the VOCSC push rod is shorter than that specified in KTB..... the VOCSC length appears to be the right one though.... about 1/8 inch shorter.
Vic
My Comet assembly was coming along well until I hit more problems with the gearbox during the last few days.
After Charlie Cannon's problems in France in 2006 (rescued by a very talanted Comet rider from Germany) when his Burman outer cover worked loose I decided to do a thorough overhaul pending my European planned rides this year on my new machine. I replaced all the studs (per KTB) with threads for the nuts changed to BSF and had a bit of welding done to repair some stripped studes. I also fitted a sealed bearing from Peter Barker. With minimal trouble I reassembled it over the winter.
It joined my beautifully restored engine (carried out by Maughan's on time and on budget) with a cleaned out UFM (thanks Andy) and the front and back wheels.
Chains all nicely adjusted (clutch looks a little wonky though) and I tried changing gear..... it worked ok on the bench but not now. I had repalaced the cracked mezac spring box with a new one from VOCSC after a second hand one from a Matchless spares company proved faulty. I put in the stronger springs from this latter one..... I found they seemed to pop out when changing gear so had to put the old smaller gauge ones (rather knackered as well) back...... what a palava putting the spring mechanism back ......grovelling a round on the floor (must invest in a stand one day)..... grease all over the place and no Vintech Wellseal this time!
Then I found the nut, just behind the selector knurled axle, loose..... anyone know what this does (it is unclear from the drawings)??.....anyway I tightened it up and it all works...... I did not want to remove the cover for the umpteenth time!
Has anyone else experienced problems with the selector springs popping out......is there a mod? Cannot find anything in the literature. Thanks in anticipation for any advice.
Vic
PS On the plus side I now feel confident I could compete with my old colleague from Germany when assembling a Burman gearbox and kick start spring!!
PPS Oh I forgot to mention that I left out the push rod ball bearing and had to take the cover off again..... more lost grease and oil!! Then the push rod was too short and even the VOCSC push rod is shorter than that specified in KTB..... the VOCSC length appears to be the right one though.... about 1/8 inch shorter.
Vic