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Re: How to improve oil flow to T100 rocker boxes? [Re: highway] #325973
08/02/10 12:29 am
08/02/10 12:29 am
Joined: Aug 2001
Posts: 918
hampshire, england
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t120mike Offline
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Posts: 918
hampshire, england
Unfortunately, the leakage you see when loosening the acorn nuts only indicates that the oil is getting that far. When they are tightened again, how much is getting all the way in?

Last edited by t120mike; 08/02/10 12:30 am. Reason: typo

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Re: How to improve oil flow to T100 rocker boxes? [Re: t120mike] #325988
08/02/10 1:51 am
08/02/10 1:51 am
Joined: Jul 2009
Posts: 3,549
Vic. Australia
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Pete R - R.I.P. Offline
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Joined: Jul 2009
Posts: 3,549
Vic. Australia
Originally Posted by t120mike
When they are tightened again, how much is getting all the way in?


The only way I can see involves measuring the pressure head with the engine running.Obviously at higher engine speeds there will be a higher pressure,so say we measure it at 3000 rpm.
Run a T-piece off the rocker feed line with a clear hose coming off vertically.See how high the oil level rises in the clear hose.That will give you the pressure head on both rocker spindles.
If you apply that pressure head to one spindle at a time,that should show how much oil each one consumes.

The only catch is that for a given pressure there will be more oil flow when the oil is hot.There is also less pressure in the return line with hot oil,so it should balance out.
I would test the pressure head with the engine cold,then do the consumption test with cold oil.

Re: How to improve oil flow to T100 rocker boxes? [Re: Pete R - R.I.P.] #325993
08/02/10 2:18 am
08/02/10 2:18 am
Joined: Sep 2006
Posts: 398
hamilton on. can.
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highway Offline
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Posts: 398
hamilton on. can.
I'm of the opinion that the pressure to lift the oil to the rockers is so low that it is little more than drip feed. I,ve got the 500 that had the extended forks I was talking about, at my shop now. I'll experiment with the feed tomrrow and get back.

Re: How to improve oil flow to T100 rocker boxes? [Re: highway] #326120
08/02/10 7:28 pm
08/02/10 7:28 pm
Joined: Feb 2006
Posts: 1,098
Toronto, Ontario, Canada
Matthew in TO Offline OP
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Matthew in TO  Offline OP
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Posts: 1,098
Toronto, Ontario, Canada
I went for a 35 km run at 60+ mph yesterday and when I got home I removed the rocker caps. BTW, I have those tall, optional hex caps with the deep internal cavity within the cap. All four caps all oil splashed about on the inside, and all four rockers had some oil sheen. One cap had a lot more oil than the other three.


1982 Suzuki GS650G
Re: How to improve oil flow to T100 rocker boxes? [Re: Matthew in TO] #326139
08/02/10 8:54 pm
08/02/10 8:54 pm
Joined: Mar 2005
Posts: 10,251
Boston, Massachusetts
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John Healy Online content

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Joined: Mar 2005
Posts: 10,251
Boston, Massachusetts
And Matthew you have a stock oil tank? There are issues with after market chopper tanks often seen on bikes with extended fork tubes. But that is only a small part of the problem!

Look at your rocker arms and then the rocker shaft spindle, if the light doesn't go on you will have to wait for the next issue of Vintage Bike.

Last edited by John Healy; 08/02/10 10:02 pm.

Re: How to improve oil flow to T100 rocker boxes? [Re: John Healy] #326184
08/03/10 2:14 am
08/03/10 2:14 am
Joined: Feb 2006
Posts: 1,098
Toronto, Ontario, Canada
Matthew in TO Offline OP
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Matthew in TO  Offline OP
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Toronto, Ontario, Canada
Yep, standard oil tank. You won't see any chopper parts on the bike while I own it.

The rocker arms and spindles all have some oil sheen, at least as seen through the top caps. Perhaps I'll open up the side rocker caps and have a look. I replaced one of the spindles last year as it was very loose (the other was fine - within spec), so I don't want to wreck the replacement.


1982 Suzuki GS650G
Re: How to improve oil flow to T100 rocker boxes? [Re: Matthew in TO] #328369
08/16/10 1:51 am
08/16/10 1:51 am
Joined: Feb 2006
Posts: 1,098
Toronto, Ontario, Canada
Matthew in TO Offline OP
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Matthew in TO  Offline OP
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Toronto, Ontario, Canada
Okay, I've got my cotter pin, but how do I stick in onto the oil tank return? I look into my tank and do not see a pipe outlet.


1982 Suzuki GS650G
Re: How to improve oil flow to T100 rocker boxes? [Re: Matthew in TO] #328376
08/16/10 2:25 am
08/16/10 2:25 am
Joined: Mar 2005
Posts: 10,251
Boston, Massachusetts
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John Healy Online content

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Posts: 10,251
Boston, Massachusetts
We did an article on this in the next Vintage Bike which is at the printer. It should be mailed in the next week. The answer to this vexing problem isn't cured with a cotter pin.


Re: How to improve oil flow to T100 rocker boxes? [Re: John Healy] #328434
08/16/10 4:32 pm
08/16/10 4:32 pm
Joined: Feb 2006
Posts: 1,098
Toronto, Ontario, Canada
Matthew in TO Offline OP
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Matthew in TO  Offline OP
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Toronto, Ontario, Canada
Excellent, I look forward to receiving my issue.

I'd like something more than just a recommendation to install a Morgo rotary pump in place of the standard plunger pump, as that's out of my budget right now.


1982 Suzuki GS650G
Re: How to improve oil flow to T100 rocker boxes? [Re: Matthew in TO] #333166
09/12/10 9:16 pm
09/12/10 9:16 pm
Joined: Feb 2006
Posts: 1,098
Toronto, Ontario, Canada
Matthew in TO Offline OP
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Matthew in TO  Offline OP
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Posts: 1,098
Toronto, Ontario, Canada
Went for a good run this weekend. Took off the rocker box caps and could clearly see a collection of fresh oil at the end of each spindle at the outside edge of the spindle. Since the oil starts at the centre top of the spindle, I assume the oil is making its way along the spindle, and then drops down to the push rod tubes.


1982 Suzuki GS650G
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