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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #21  
Old 22nd June 2008
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The oil that was called for in 1975 was a 50 weight motor oil. In 1975 they had ATF, B&M Trick shift, and multi-viscosity motor oils, yet they specified a STRAIGHT WEIGHT MOTOR OIL. The tolerances that were present in the gear backlash, the pitch of the gear teeth, was different than it is in the evo. These things benefit from a little extra "cushion" in the oil film. They got rid of the trap door transmission in 06 I believe, so you have to split the engine cases to get at the tranny. I don't care if it's a rubber mount or solid, an Evo is not an Ironhead. I hope Donny Peterson's tech library is back up soon.
He was writing tech articles when I was in high school. Harley invited him to see and evaluate the TC88 before they unveiled it. He knows these engines.
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  #22  
Old 22nd June 2008
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hi JT.I use Castrol 20w50 in the cooler months and switch to Valvoline VR1 sae 60 racing oil when it gets hot.
I also have a 75 which has the transfer valve in the primary..Do not use atf in there.
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  #23  
Old 22nd June 2008
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Quote:
Originally Posted by pitbull_1_us View Post
hi JT.I use Castrol 20w50 in the cooler months and switch to Valvoline VR1 sae 60 racing oil when it gets hot.
I also have a 75 which has the transfer valve in the primary..Do not use atf in there.
I epoxied over the transfer valve. It's gone, no worries.
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  #24  
Old 6th May 2009
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Just as a note.

Years ago [ '93 ]a friend who worked at the Harley dealership told me he ran Dexron ATF in his sportster primary. He said it was the same basic stuff as the HD at the time.
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  #25  
Old 6th May 2009
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Isn't ATF basically a 0-weight oil?
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  #26  
Old 6th May 2009
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I have never seen a Sport-trans lube that was as thin as ATF. A race trans rarely gets more than 1000 miles on it between teardowns and parts that we run for many thousands of miles are tossed over the shoulder. And yes I have run ATF In a 4 speed behind a big block Mopar (it MIGHT have improved shifting and definitely decresed drag), but again that was not recommended for a high mileage application, it was for drag racing.

For a non-racing, longevity focussed application for the Sportster trans/primary lube, it should be gear oil, not hydraulic trans oil.

I think the Formula+ oil is better suited for the newer Sporties (5 speeds) I think it is on the light side for a 4 speed trans, the manufacturing tolerances and gear pitch design are very different.

The correct lube for your primary & trans is Sport Trans Lube.
It is a heavy, high shear, gear oil, with NO friction modifiers (for a happy clutch).

Some of the suppliers are,
Drag Specialties - Gear & Chaincase for Sportster
Bikers Choice - Sport Trans Lube
Bel Ray - Sport Transmission Fluid
Twin Power - Sport Trans Lube
Klotz - Gear & Chaincase for Sportster
RevTech - Gear & Chain

But as with any religious discussion, I would never tell you that is the one true lube.

KY anyone?
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  #27  
Old 6th May 2009
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DO NOT USE GEAR OIL IN YOUR MOTOR!!!!

It isn't heavier-there are two different scales - but the bad thing is that gear oil has sulfur in it. When that combines with the moisture that comes in with crankcase blowby, it forms SULFURIC ACID. Not good for your motor.

ATF is pretty thin; it is full of detergent. We used to flush engines with it.
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  #28  
Old 7th May 2009
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ATF fluid should only be used in an emergency. It can get you home, but you need to change it imediately.
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  #29  
Old 8th May 2009
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I know this an older thread, but it carries some value...

I don't think engine oil and Hypoid gear oil should be mixed. Incompatibility issues, degradation and separation.
Also, why do this? To get your oil up to a thicker grade? If this is the reason, go to a 60 or 70 wt oil. The latter being harder to find, but it can be found.

I had an 64 Dodge Dart with a 225/6 with a bit of a piston slap. Ran 70wt in it and it settled it down... some.

Unless it is extremely hot and arid where you live and ride, a high grade 20w50 or straight 50 will suffice.
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  #30  
Old 8th May 2009
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Holy Slippery Gears, Batman!

ATF in your transmission?

Is this a ploy of the Joker?

Do the sounds, Snap, Crackle, Pop .. give you a clue?

Stay tuned ... same blog, same web site.
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