Transmission oil weight

usafwx
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usafwx
So I bought a used CRF250R and the guy was running Bel-ray 80w-85 transmission gear saver oil in there and wanted to switch back to factory spec GN4 10w-40, is it okay to just do a change, worried a bit about the residual 80w-85 in there with the 10w-40, or am I overthinking it. Thanks in advance, especially Paw Paw as I'm sure he'll chime in.
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Pirate421
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Pirate421 4/15/2017 12:50pm
4/15/2017 12:50pm
You'll be fine. ive done it plenty of times with no ill effects. Especially since it's just the clutch and tranny. If it was the engine you might flush it with some fresh oil first but I wouldn't for the clutch.
usafwx
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usafwx 4/15/2017 12:57pm
4/15/2017 12:57pm
Pirate421 wrote:
You'll be fine. ive done it plenty of times with no ill effects. Especially since it's just the clutch and tranny. If it was the engine...
You'll be fine. ive done it plenty of times with no ill effects. Especially since it's just the clutch and tranny. If it was the engine you might flush it with some fresh oil first but I wouldn't for the clutch.
Thanks, figured I was being paranoid. I'm a OCD maintenance freak with stuff, torque everything, etc. Thanks man.

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rmoto003
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rmoto003 4/15/2017 10:39pm
4/15/2017 10:39pm
"transmission" specific oil is rated different than motor/trans oil. So 85w transmission oil is pretty close to the same viscosity as 10w40.
mxb2
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mxb2 4/16/2017 6:34am
4/16/2017 6:34am
usafwx wrote:
So I bought a used CRF250R and the guy was running Bel-ray 80w-85 transmission gear saver oil in there and wanted to switch back to factory...
So I bought a used CRF250R and the guy was running Bel-ray 80w-85 transmission gear saver oil in there and wanted to switch back to factory spec GN4 10w-40, is it okay to just do a change, worried a bit about the residual 80w-85 in there with the 10w-40, or am I overthinking it. Thanks in advance, especially Paw Paw as I'm sure he'll chime in.
Gn4, both sides.
usafwx
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usafwx 4/16/2017 6:38am
4/16/2017 6:38am
mxb2 wrote:
Gn4, both sides.
That was my plan. Wink Guy ran bel ray different stuff in each.
usafwx
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usafwx 4/16/2017 6:39am
4/16/2017 6:39am
rmoto003 wrote:
"transmission" specific oil is rated different than motor/trans oil. So 85w transmission oil is pretty close to the same viscosity as 10w40.
Did not know that! Thanks, learn something new everyday.
slipdog
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slipdog 4/16/2017 7:34am
4/16/2017 7:34am
This is the part where someone comes in and says "Rotella, Bro!"
mxb2
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mxb2 4/16/2017 9:10am
4/16/2017 9:10am
mxb2 wrote:
Gn4, both sides.
usafwx wrote:
That was my plan. Wink Guy ran bel ray different stuff in each.
Did it in my 07 crf 450, now 15 crf 450, no problems at all. For what it's worth Mxa. Posted using gn4 both sides long time ago.
usafwx
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usafwx 4/16/2017 9:12am
4/16/2017 9:12am
mxb2 wrote:
Did it in my 07 crf 450, now 15 crf 450, no problems at all. For what it's worth Mxa. Posted using gn4 both sides long...
Did it in my 07 crf 450, now 15 crf 450, no problems at all. For what it's worth Mxa. Posted using gn4 both sides long time ago.
Yep. I did my homework and saw that seems to be the best choice, previous owner I guess thought he knew better, good thing bike has only 6 hours on it. Thanks man and happy easter.
mxb2
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mxb2 4/16/2017 9:17am
4/16/2017 9:17am
mxb2 wrote:
Did it in my 07 crf 450, now 15 crf 450, no problems at all. For what it's worth Mxa. Posted using gn4 both sides long...
Did it in my 07 crf 450, now 15 crf 450, no problems at all. For what it's worth Mxa. Posted using gn4 both sides long time ago.
usafwx wrote:
Yep. I did my homework and saw that seems to be the best choice, previous owner I guess thought he knew better, good thing bike has...
Yep. I did my homework and saw that seems to be the best choice, previous owner I guess thought he knew better, good thing bike has only 6 hours on it. Thanks man and happy easter.
Thanks man, same to you.

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