850g 1100g angle drive, secondary gears, bevel??

[nert]

Does anybody know if the (2) secondary drive gears (shaft drive, transmission end) are the same for an 850 and an 1100? I got a broken bevel gear, these things are harder to find then hens teeth. I guess cause they usually stay with the engine case. I have an 1100. located gears for an 850. Don't know if they will fit?
thanks

[Nessism]

Did you go to one of the various OE parts resellers to see if the part numbers match?

[nert]

i did. they are "off" by one number. Wasn't sure if that means they are not the same?? The ratio 16/17 is the same. I guess i could check the part numbers of the housings and such. The final drives (differential) work for either 850 or 1100. Thought i might get lucky. Thought some one on the forum would know for sure.

[Zooks]

Someone will know for sure. There have been a lot of shaft questions lately. Where did the gear brake? I had one brake on me recently and had an engineer repair it for me. I took lots of pics and am planning on writing up a bit of a 'how to' guide as soon as I have the time.

[psyguy]

just been reading something on the subject - apparently parts are interchangable 850-1100 if both parts are pre '82 or post '82
'82 obviously being the year of a change in design

would be interested in what you find

so, what years are your parts?

[psyguy]

I got a broken bevel gear, these things are harder to find then hens teeth. I guess cause they usually stay with the engine case.

the drive and driven gears wear together so ideally you want to get a set (they are also shimmed as a set from factory, although that can be sorted with a bit of measuring etc)

[Zooks]

You can also have them (odd cogs) 'lapped' together at an engineering shop that specialises in diffs and gearboxes. Not very expensive.

[psyguy]

You can also have them (odd cogs) 'lapped' together at an engineering shop that specialises in diffs and gearboxes. Not very expensive.

can you elaborate plz, i'm keen to learn :-D

[Zooks]

They do this when they build diffs. They match together a crown wheel & pinion and then place them in a special machine.
This machine makes them run together at relatively low revs. Whilst they are spinning they put an abrasive paste on the teeth which helps to bed them together. I think the paste is similar to valve grinding paste (but I'm not sure).

This is a typical set up in a car diff -




In the pic on the left the 'ring gear' is the crown wheel. It is the same principle in the gearbox of a shaft drive bike.

[Zooks]

In a bike this is what the bevel gears look like -



you can see that it is the same principle as a car diff. One cog has angled teeth and (spins one way) and causes the other to spin through a different plane.

Edit: In this pic both cogs are angled. Sometimes only one cog will be angled. It depends on the application.

[Zooks]

This is two gears being lapped together in a machine. You can see the paste on the teeth of the gears. It looks like grease in these pics.

[nert]

unfortunately, i have an 82. The output pinion snapped the threaded section off the gear. Still operated as it is splines that transmit the torque. The thread shaft end holds the bearings, spacers and preload all together.

[Zooks]

I have a fix for you. Can you post a pic of the damaged part? I think what you are talking about is one of the most common problems that happens with these shaft drives.

I haven't got the time now but tomorrow I will post up some pics of how I repaired that same problem.

[nert]

I don't have the broken bevel gear out of the bike. I pulled the side bevel gear, remove the swing arm and driveshaft. Thats when i found the broken bevel gear shaft. The rear gear housing won't come out of the case whil;e the engine is in the chassis. I put the swingarm, etc back together so i could move the bike around. I knew this would be a hard (expensive) part to get. The threaded nub broke off the bevel gear shaft right at the spline section. As fate would have, i have (3) other bikes in pieces. Wanted to get the parts first before making (4)

[bwringer]

I have an '83 GS850 engine with a seized crank but good bevel gears. They're not doing me any good sitting under my workbench, so I'll make you a killer deal.

PM if you're interested!