Comfirm torque specs for motor mounts

[Hawkinspickle]

Hi folks,
Just installed a 1980 motor into my 79 frame. It all fit perfectly except I need to confirm the following torque specs. Any help would be much appreciated as there seems to be some contradictions between my Clymer manual for a ’79 special and a Yamaha service manual for the same year. For example, the manuals seems to conflict for the 4 bolt connecting the drive flange u-joints. One said 79 Ft. Lbs and the other 31 Ft. Lbs. I figured the 31 was correct. Weird? Can some please confirm the following torques (see attached) for the motor mounts as shown. Hate to bugger them up!

Thanks all,

[LAB3]

I'd go with what the Yamaha manual calls for before Clymer.

[bikerphil]

From the Yamaha Service Manual...

Front engine mounting bolts upper and lower 48.5 ft/lb (10MM bolts)
Rear engine mounting bolt 72.3 ft/lb (12MM bolt}
U-Joint 31.8 ft/lbs

[Hawkinspickle]

Thank you gentlemen. The Clymer manual I have is way off then. So when you say upper and lower mounting bolts Bikerphil, you mean #2 and #4 on my picture, not #3 which do not have any torques specs. The manual talked about "through bolts" being 72ft/lbs which #1 and #2 are. ...but it appears that only #1 should be torqued to 72ft/lbs.
Dan

[Hawkinspickle]

[bikerphil]

#1- 72 ft/lb

#2,3,4- 48 ft/lb

The front thru bolt is smaller diameter than the rear, that is why it would be 48

[Hawkinspickle]

As an aside, looking at a few posts and Bikerphil’s response to me, I just noticed my faux pas in terminology, i.e., motor vs engine. While people use both interchangeably, the difference is that motors run on electricity and engines run on combustion. I now know better.

[DiverRay]

Actually, I was told in school years ago that a motor is self starting, and an engine needs something to start it turning. But, we're splitting hairs at this point! I hope you get that engine/bike running soon. The wet and cold is on it's way.

[bikerphil]

Well. It's called a motorcycle for a reason, because of it's motor, right?

[red bandit]

I was told 45 years ago that a motor is an electric motor. An engine is a gasoline engine. I'm just glad it goes varooom.

[bikerphil]

Don't forget about the original engine powered by steam.