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1973 RT3 Oil Pump Output

  • Pinbill
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1973 RT3 Oil Pump Output was created by Pinbill

Hello,

I am refreshing my RT3. The bottom end had a bit of noise so I parked it two years ago. The build is moving along. I haven't been able to find RT3 oil output specs for the auto lube pump.

Can anyone tell me the flow for a 1973 RT3?

Thank you,

Bill
12 Apr 2024 08:23 #1

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Replied by MarkT on topic 1973 RT3 Oil Pump Output

I have never found the exact specs in Yamaha Literature.  I've seen up to 1971 specs and then 1974 and beyond.  The 1971 RT1b and then the 1974 DT360 have the exact same same specs so "best guess" is the RT2 and RT3 had those same specs. 

Idle 0.95 to 1.2 cc per 200 strokes.
Full Throttle 8.8 to 9.7 cc per 200 strokes.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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12 Apr 2024 11:45 #2

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Replied by Pinbill on topic 1973 RT3 Oil Pump Output

Thank you for the help.

Here is another question: Maybe someone knows the answer. The book says the clutch springs should be no less than 36.4mm. My springs are 34.5mm +/-. I bought a new set of OEM Yamaha clutch springs. They measure 34.5. Is this a mistake in the book?

 
12 Apr 2024 12:26 #3

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Replied by MarkT on topic 1973 RT3 Oil Pump Output

This thread might answer your spring question.
yamaha-enduros.com/index.php/forums/1968...spec-question#143851
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
12 Apr 2024 14:27 #4

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Replied by Pinbill on topic 1973 RT3 Oil Pump Output

Thanks man. I can't wait to have this bike reliable. It is one of my favorites. It fits me perfectly and still has the original seat. The new seats aren't quite the same.
12 Apr 2024 14:52 #5

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Replied by Pinbill on topic 1973 RT3 Oil Pump Output

Ok, ready to fire it tomorrow. Waiting on a kick start seal. One more question:

The exhaust string gasket.... Seems like there is a reason they don't use this design anymore. I am not sure if I should pack it in the manifold or try to wrap it around the pipe before installing it. Any tips on how to use it?

Thanks for the help,

Bill
17 Apr 2024 06:20 #6

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Replied by Gr8uncleal on topic 1973 RT3 Oil Pump Output

Whilst it's not immediately obvious, the manifold is actually two piece.

I took all of mine apart by resting the outer parts of the manifold (where the bolt holes are) between two pieces of wood and then knocking the inner part out with a wooden hammer (rubber should do just as well).

I gave both parts a thorough cleaning and then reassembled.

The string gasket fits, I believe, between the inner and outer parts of the manifold - some folks just fit one diameter's worth of gasket, others two (you will have some left over).

The exhaust fits between the inner and outer parts of the manifold and pushes up against the gasket. Make sure that the retaining springs aren't tired!
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17 Apr 2024 06:34 #7

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