Doing a full restoration on my 1978 TY175. Someone who has owned the bike before me has kindly (said with sarcasm) drilled out the threaded nut which is welded onto the bottom engine mount at the rear of the engine. Could someone please tell me the size of the thread (i.e. M7, M8, etc)which should be in this engine mount. For some reason the hole in the engine which this particular bolt slides through looks bigger than the other two. Is this the case ? Also, the top mount at the rear of the engine has a bush which goes through the crank case. Should the other two mounting holes in the engine have this also ?

Your advice would be much appreciated.

Gareth

Edited April 1, 200917 yr by gazzaecowarrior

Front mount bolt is M8 and has no bush in the motor

Top rear bolt is M8 and has a rubber bush and steel sleeve inside the rubber bush. Both go right through the motor casings and the frame lugs should clamp to the steel sleeve.

Bottom rear with welded on nut - I couldn't see with the motors is situ if they are M8 or M10, but there is no bush in this lug.

I wouldn't be surprised if someone had made some of the holes a bit oversize because the TY175 frame does move out of shape with use and unless it gets pushed back in shape after taking the motor out, the holes don't line up when reinstalling the motor in the frame.

Front mount bolt is M8 and has no bush in the motor

Top rear bolt is M8 and has a rubber bush and steel sleeve inside the rubber bush. Both go right through the motor casings and the frame lugs should clamp to the steel sleeve.

Bottom rear with welded on nut - I couldn't see with the motors is situ if they are M8 or M10, but there is no bush in this lug.

I wouldn't be surprised if someone had made some of the holes a bit oversize because the TY175 frame does move out of shape with use and unless it gets pushed back in shape after taking the motor out, the holes don't line up when reinstalling the motor in the frame.

Thanks feetupfun for your info