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DT2 and RT2 oil pump drive

13 Aug 2019 13:31
run103
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DT2 and RT2 oil pump drive #1
I am putting a RT2 engine into a DT2 frame but I am using the oil pump from the DT2. The RT has a coarse thread worm gear to drive the pump and the DT has a fine thread Can you use the fine thread on the RT as long as you make sure it pumps enough.
Doug

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13 Aug 2019 14:17
DEET
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DT2 and RT2 oil pump drive #2
"Can you?" yes
"Should you?" No

It won't deliver enough oil at the right time.
That is why they are different.

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Where the Yamaha Enduro is still a current model...

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13 Aug 2019 15:01
RT325
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DT2 and RT2 oil pump drive #3
I never realized all that but i've never tried swapping pumps around either. All good info.

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13 Aug 2019 15:28
run103
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DT2 and RT2 oil pump drive #4
Deet
So the coarse thread causes the pump to turn faster
Doug

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13 Aug 2019 15:31
run103
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DT2 and RT2 oil pump drive #5
Deet So do all the big bores have the coarse thread worm gear and 250's and down have the fine thread
Doug

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13 Aug 2019 16:20
DEET
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DT2 and RT2 oil pump drive #6
I have not compiled a list that would provide data on that.
The pitch of the ring gear has to match the pitch of the worm gear.
There was a service bulletin for the RT1 stating they needed to change the pitch because it wasn't oiling properly. You would have to measure the pitch to determine which ring gear matches which worm gear.

If a DT1 pump was OK for a RT1, why would Yamaha make a separate one for the RT?
When the early RT1 pump wasn't providing enough oil, they made a change. They knew what they were doing.


I tend to stay with proven engineering.

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Where the Yamaha Enduro is still a current model...
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13 Aug 2019 16:23
DEET
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DT2 and RT2 oil pump drive #7
Not only is the pump gear different, but the pulley is different.


All those things have to work together.

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14 Aug 2019 00:32
Gr8uncleal
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DT2 and RT2 oil pump drive #8

DEET wrote: I have not compiled a list that would provide data on that.
The pitch of the ring gear has to match the pitch of the worm gear.
There was a service bulletin for the RT1 stating they needed to change the pitch because it wasn't oiling properly. You would have to measure the pitch to determine which ring gear matches which worm gear.

If a DT1 pump was OK for a RT1, why would Yamaha make a separate one for the RT?
When the early RT1 pump wasn't providing enough oil, they made a change. They knew what they were doing.


I tend to stay with proven engineering.


This was probably the one and I probably got it from the Tech Library.

Does anyone know if Yamaha issued an updated schedule?

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14 Aug 2019 08:12
run103
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DT2 and RT2 oil pump drive #9
Well this started people thinking..Anyhow I have connected a coarse thread pump and when i get the clutch working I will test the pump according to the bulletin listed here. I have 4 pumps and all 4 have different pulleys Thanks again guys for all the reply's
Doug

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14 Aug 2019 13:53
1971DT250
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DT2 and RT2 oil pump drive #10
The pulleys have different markings depending on the model. Maybe this will help:

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The hours spent riding my Enduros is not deducted from my life span.

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