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Straight cut drive gears

12 Dec 2019 16:44
MarkT
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Straight cut drive gears #11
High RPM is easy on the gear teeth in terms of strength. The faster the gear is spinning, the more HP the teeth can handle.

Curious if you used to run ATF? I know a lot of people use and recommend it but my experience is excessive gear wear in a bike trans.

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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13 Dec 2019 05:59
Pillsbury
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Straight cut drive gears #12
I do not run ATF in trannys, I was running Valvoline R 30. I'm not the only one that has had problems with the 1st year gears :) It seems like I was the only one running Dino oil, most use synthetic.

1970 DT1-C Grand Prix race bike
1970 DT1-C Street tracker
1968 Honda CL90
1973 Honda CR250
1974 Honda MR-50
1966 Triumph Tiger Cub
1970 Suzuki TC90
1947 Mustang
1974 Suzuki TC185

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15 Jan 2020 20:42
jcarr
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Straight cut drive gears #13
Sort of related,
how important is it to use a shielded bearing next to first gear, Looks like it keeps oil on the gear side and helps with first gear lube.
I got a set of generic bearings from the Buzzard and it came with an unshielded bearing.

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16 Jan 2020 06:23
MarkT
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Straight cut drive gears #14

jcarr wrote: Sort of related,
how important is it to use a shielded bearing next to first gear, Looks like it keeps oil on the gear side and helps with first gear lube.
I got a set of generic bearings from the Buzzard and it came with an unshielded bearing.


Which model? Behind the clutch? There are Yamaha service bulletins for some models warning that a) the shield is critical and b) the shield needs to be installed a on the "outside" or the bearing will be starved for oil.

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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16 Jan 2020 13:33
jcarr
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Straight cut drive gears #15
That's the one behind the clutch, for a DT1-f.
Thanks for the confirmation.

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16 Jan 2020 14:51
MarkT
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Straight cut drive gears #16
DT1f is a serial number... not the model... probably a DT2 or DT3? Some models have a "retainer plate" that screws on to the case and over the bearing and acts as a shield...



If yours doesn't, then best to use the shielded bearing. And good catch noticing the shield was missing!

:Buds

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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