Hello
Yesterday came a fault in starter,the motor runs but does not turn the engine,what do you think is the fault.The starter has been running previously poorly but the engine has go to run.My bike is -81 years model.
The best driving season is just underway, I have to move to the another bike,Sarolea 24 T 1929.

      Markku

Hi,

does the starter run really fast? With a singing, hissing sound?
Then it should be the starter clutch (german: Anlasserfreilauf), left side of the engine / crank case, looks like a tin can. If You can turn it in both directions, it's rotten inside. Notice: As this part is actually not important (!!), many people here block it by welding. If You have no equipment for welding, You may drill some holes in there and put some screws (use loctite) in to prevent the clutch from running free. The part can also be fixed, but this means You would have to open the can and replace the tiny bolts in there, as they are not round any more. It does't take more than that. I have done this before and would do it again but it requires some patience ... .

Cheers,

Stefan

Hello

Thank you.A couple of supplementary questions.
The starter runs really fast but nothing special sound.
Do You mean the part number 1?
Do the starter get out easy or whether to extract the left side of the engine?

Yes, the starter clutch is part no. 1 in this picture. The part is not meant to be opened, but one can do it with hammer and chisel or some strong screw drivers used as chisels.
Sounds: You should hear the starter running free, because it's much faster and sounds somehow different, as it doesn't have to move the engine but only the starter drive and this clutch.
To get to this part, You have to remove the crank case cover on the left side. You find it just behind the gears/wheels of the starter drive.

Good luck,

Stefan

Hello
Thank you so much for your advice.
Renovation seems to remain for the winter, I think that the cover does not fit out because the lower part of the cover and body pipe space is only about 1,5 cm.
It is intended to take the engine out of the chassis in the winter and to renovate and clean the engine and perhaps to paint the cylinders.

There is a fast alternative carried out with a shim (hopefully still available! Yamaha no .: 1J7-17537-YO-30 see technical info => miscellaneous => "Eppo Karsijns"). Works without motor cover to dismantle.
Good luck, Werner

The shim is only helpfull if the planetary gear in the starter motor is slipping, but usually the starter clutch under the left engine cover is slipping. The left cover must be taken away, then the starter clurch can be removed and welded together, as Stefan said correctly.

Hello
What are the dimensions of that shim 1J7-17537-YO-30 and why should it mount.

sorry the dimensions I do not know  - my repair is already > 20 years back (last century!).
http://www.tr1.de/technics/misc/starter.htm
I think it's worth a try if you have failed please follow the recommendation of horn schorsch.
greetings, Werner

In an earlier post for the repair of the planetary gearing, the mass have been identified:
Rolling bearing shim with dimensions 62 X 50 X 0.1 mm. I have not measured it. Another Yamaha Part Number: 156-11563-00

greetings, Werner

There are youtube videoes concerning the starter assembly for the 81-82 USA version. Not the diagram posted above, I think.
For my USA XV920RH I had to replace the starter.  
The planetary gear slipping is a known issue, simpler fix.  Shim, Loctite, or weld.
I would remove the left case cover and examine mechanism there.