10-30 for 20 weight in chaincase?

For a '72 Triumph T100R Daytona, the manual calls for SAE 20 weight oil in the primary chaincase. You just can't find straight 20 weight oil anymore. Is it o.k. to substitute 10-30 oil in the chaincase?
Bill
 
Due to what the Triumph manual said, I initially wasn't aware that the two oils might intermingle, and wasn't sure a multi grade would be o.k. with the clutch plates. The bike hasn't run for almost 20 years and I'm now thinking of using the thinner mineral 10-30 in the engine for a few short running cycles to flush it out, dump it, then put in what it would regularly run with. Since I'm a big fan of motorcycle specific full synthetic motor oils, I'm now wondering if there are any problems with using something like Klotz in this Triumph?
 
pantah_good said:
Due to what the Triumph manual said, I initially wasn't aware that the two oils might intermingle, and wasn't sure a multigrade would be o.k. with the clutch plates.

If you use a "motorcycle" 20w-50 then you shouldn't have any problems (unless there's an existing problem with the clutch).



pantah_good said:
The bike hasn't run for almost 20 years and I'm now thinking of using the thinner mineral 10-30 in the engine for a few short running cycles to flush it out, dump it, then put in what it would regularly run with.

Well, if you only intend to run it for a short time then it probably won't do any harm although I think I'd rather use a cheap 20w/50 myself, but I would clean the primary case and clutch plates regardless as it's not a difficult job on a Triumph.
 
Re; “Since I'm a big fan of motorcycle specific full synthetic motor oils, I'm now wondering if there are any problems with using something like Klotz in this Triumph? “

You could use this synthetic motor oil in your engine, but avoid at ALL costs using anything synthetic where there is a wet plate clutch, as you will find out to your cost, it will tend to slip. :(
 
Sounds like a motorcycle specific multi-grade mineral oil is the way to go with this bike. The bikes owner can't bring himself to spend any extra for synthetic anyway.
 
Was common to run A.T.F. ( dextron III ) in chaincases .

Even in Trans. at Daytona , for an extra mph or two .

FRICTION MODIFIED Oils , as they called them , in the 70 on Triumphs , with the Combined Oil System - could ( did ) lead to clutch slip , at the time .

A weekend bike , as opposed to everyday , Id run 40 monograde in the engine , and run it 5 minutes before heading out . Theory is circulate the Oil Twice , minimum . Anyway
before engageing gear . Aston before the plastic ones , were 15 min. before full wellie . Thats so engines at full operating temperature & stabilised , so clearances as required .
 
Matt Spencer said:
A weekend bike , as opposed to everyday , Id run 40 monograde in the engine , and run it 5 minutes before heading out . Theory is circulate the Oil Twice , minimum . Anyway
before engageing gear . Aston before the plastic ones , were 15 min. before full wellie . Thats so engines at full operating temperature & stabilised , so clearances as required .

Just start up and ride away.
 
I have 2 79 T140D. The past 2 years, I've been using 20W 60 with nice results. Less consumption, the one minor primary leak almost disappeared, tranny feels shifts like hot rubber.
 
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