• Husqvarna Motorcycles Made In Sweden - About 1988 and older

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Transmission oil weight again

joe vanella

joe vanella

Husqvarna
A Class
I am just getting my 78 250 CR and 80 390 OR ready to go for the first time. An old manual said to use 20 wt. It seems light compaired to my vintage honda that uses 40 wt. What are people currently using? Thanks for the help. My last Husky was in 1982.
 
many here use atf type f which is a little light being just under 10wt...the clutches like it tho
others use a motorcycle motor oil, i use amsoil 10w30 motorcycle oil..other use a straight weight non detergent oil..
 
Hi
I am using a Briggs n Stratten engine oil which is a SAE 30 and easy to get.
Works fine.
Any heavier and I think you might have a clutch drag problem.
Cheers.
 
ATF - F, the ford early borg warner fluid is good, they will survive on bel ray lite weight gear oil as well, just paying for it is a drama
 
We use Mobil1 0W40 oil in our 2 stroke transmissions. It allows light shifting like the ATF with a viscosity improvement when heated.
 
I was told by Rick at Vintage Iron to use the cheapest oil you can find in vintage bikes. He says if you use synthetic oil the clutch may slip. So I go to costco and get the Chevron 10-30W oil and never had a problem. After tearing down many of these vintage motors, I find many people let them sit for years in the garage/barn and moisture collects at the bottom of the case and causes the magnisum to corrode. In some cases I have found holes caused from corrosion. Holes can be repaired with JB Weld.
 
Synthetic oil does not make older clutches slip, that is a myth. Friction modifiers, such as molybendum disulfide and other particulate pressure additives are what cause the slipping.
 
Tinken,
I'm rebuilding a '74 250WR. Do you think the Mobil 1 0-40 would be ok in that tranny? I run it in my TE449 and have had great results so far. No clutch drag or slippage.
 
If the clutch stack measures 26mm or more, and the clutch springs are ok, and the clutch lever adjustment is between 7-11mm and the clutch slips, you gotta look at the type of oil used.
 
toolguy1 said:
Tinken,
I'm rebuilding a '74 250WR. Do you think the Mobil 1 0-40 would be ok in that tranny? I run it in my TE449 and have had great results so far. No clutch drag or slippage.
Click to expand...

Yes, we use it in everything from our large 4 strokes to our 50cc 2 smokes. My family owns 12 vintage bikes from 1968 to 81 and I have never had an issue with M1 0W40, but I have with other oils, including those rated as "Jaso correct".

Puckerbush said:
If the clutch stack measures 26mm or more, and the clutch springs are ok, and the clutch lever adjustment is between 7-11mm and the clutch slips, you gotta look at the type of oil used.
Click to expand...


I agree with checking the clutch specifications as well as physically checking the plates for past build up. I have seen moly build ups on engines running Amsoil as well as other popular branded Jaso ma based oils which took lots of elbow grease and our parts washer to clean up. Also I prefer detergent based oils because debris tends to stay suspended in the solution rather than adhering to the engine surfaces.
 
DSCN0596.JPGDSCN0600.JPGDSCN0597.JPG I opened this engine and found this black muck that had the consistancy of hard plastic covering all the transmission. I began cleaning this residue off with lacquer thinner and wondered what in the world caused it. The motor didn't have any oil in it when I got it but I still couldn't figure it out. Then I looked at the clutch basket and discovered the rubber buffers were missing. Someone had put something in the case that dissolved the buffers to this plastic muck. Watch what you put in your case.
 
Puckerbush said:
View attachment 39606View attachment 39607View attachment 39608 I opened this engine and found this black muck that had the consistancy of hard plastic covering all the transmission. I began cleaning this residue off with lacquer thinner and wondered what in the world caused it. The motor didn't have any oil in it when I got it but I still couldn't figure it out. Then I looked at the clutch basket and discovered the rubber buffers were missing. Someone had put something in the case that dissolved the buffers to this plastic muck. Watch what you put in your case.
Click to expand...
I have seen this happen on the 250/310s a lot, but not because of chemicals. The shear high oil heat melts the rubber clutch bushings and our bushing kit is the only resolve without having to purchase a new oem basket.
I'm sure that adding so called "engine flush" additives may tend to speed theses issues.
 
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