Rear Main Seal

[Deleted User 287]

Brad - you might want to replace the o-ring on the front side of the flywheel, if your bike has one.

No o-ring here:

I'll bet it was one of those improvements they trial-tested in on the Type-248 series.

[ME 109]

A redhead in cowboy boots - the stuff of dreams!

In your dreams!

[Deleted User 72]

A redhead in cowboy boots - the stuff of dreams!

In your dreams!

AMAZING! And all the way from Australia, too!

[bbelk]

I have it back with a new RMS and oil pump o-ring. I put the flywheel back on and torqued the old bolts to 80 Ft Pounds. The book says to do it with new bolts only and that they must be dry. They don't say what to toruque it to. Then in itallics, they say the factory has revised this and says using the old bolts is ok, and they should have engine oil on them and they should be torqued to 92 foot pounds. My wrench only goes to 80 pounds and that seemed pretty damn tight so I quit. If someone thinks it is critical to go up to 92, please let me know.

I put the clutch plate back in using a couple long bolts and then started the old proper bolts. Before tightning it down, I stabbed the transmission and things seem to line up, so I went round and round until there was no more give in the spring, but I have not tourqued it yet. I have ordered new bolts for this and they have not come in yet. They are allan head. Anyone know how to put a tourqe wrench on that and how critical is it to get them right. These came out without much effort.

Lastly, I thought I would share this. I have taken so much crap off this bike it floats:

[bbelk]

I have it back with a new RMS and oil pump o-ring. I put the flywheel back on and torqued the old bolts to 80 Ft Pounds. The book says to do it with new bolts only and that they must be dry. They don't say what to toruque it to. Then in itallics, they say the factory has revised this and says using the old bolts is ok, and they should have engine oil on them and they should be torqued to 92 foot pounds. My wrench only goes to 80 pounds and that seemed pretty damn tight so I quit. If someone thinks it is critical to go up to 92, please let me know.

I put the clutch plate back in using a couple long bolts and then started the old proper bolts. Before tightning it down, I stabbed the transmission and things seem to line up, so I went round and round until there was no more give in the spring, but I have not tourqued it yet. I have ordered new bolts for this and they have not come in yet. They are allan head. Anyone know how to put a tourqe wrench on that and how critical is it to get them right. These came out without much effort.

Lastly, I thought I would share this. I have taken so much crap off this bike it floats:

[the quinner]

I have it back with a new RMS and oil pump o-ring. I put the flywheel back on and torqued the old bolts to 80 Ft Pounds. The book says to do it with new bolts only and that they must be dry. They don't say what to toruque it to. Then in itallics, they say the factory has revised this and says using the old bolts is ok, and they should have engine oil on them and they should be torqued to 92 foot pounds. My wrench only goes to 80 pounds and that seemed pretty damn tight so I quit. If someone thinks it is critical to go up to 92, please let me know.

There was a bulletin released that applies to the 1981+ models...it revised the torque spec from 72 ft-lbs to 90 ft-lbs. The 1981+ models have 11mm bolts and the later 'clutch carrier' that sandwiches three separate pieces where the earlier bikes just had a solid flywheel...

Does your bike have 10mm or 11mm flywheel bolts? (various sources have the crossover date as 9/74...others 9/75)...

If you have 10mm bolts, you over torqued them...the spec for the /6 10mm bolts is 55 ft-lbs. (the /5 10mm bolts is even less). If you have the 11mm bolts, you are just fine.

***NOTE: the re-using bolts only applies to the 11mm bolts. There are enough instances of the smaller bolts breaking that I would not re-use them.***

[the quinner]

[bbelk]

There was a bulletin released that applies to the 1981+ models...it revised the torque spec from 72 ft-lbs to 90 ft-lbs. The 1981+ models have 11mm bolts and the later 'clutch carrier' that sandwiches three separate pieces where the earlier bikes just had a solid flywheel...

Does your bike have 10mm or 11mm flywheel bolts? (various sources have the crossover date as 9/74...others 9/75)...

If you have 10mm bolts, you over torqued them...the spec for the /6 10mm bolts is 55 ft-lbs. (the /5 10mm bolts is even less). If you have the 11mm bolts, you are just fine.

***NOTE: the re-using bolts only applies to the 11mm bolts. There are enough instances of the smaller bolts breaking that I would not re-use them.***

My bike is an "early" 1975 R90/6 - however the bolts looked bigger than 10mm, but I am not sure I can see the difference between 10 and 11 mm. The socket was 19mm if that helps.

The clutch assembly is a three piece set up that looks just like my 1979 R65 did.

Thanks

[mattcfish]

My 8/75 R90/6 has 11mm bolts and the o-ring on the flywheel.

[the quinner]

Okay...sounds like 9/74 is the crossover date...you are fine at 80 ft-lbs...

By 3 pieces...I was talking about the construction of the 1981+ flywheel assembly (1, piece that slips over end of crank and does the sealing...2, the clutch carrier (flywheel) itself...3, the "washer" that sits under the bolt heads)...completely independent of the clutch. Point being, I suspect THAT is what led to the upping of the torque spec on the 1981+ bikes.