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Buell Forum » THUMPer Forum » Buell Blast Thumper Knowledge Vault » Engine - all topics related to the Motor » Primary Drive and Transmission » Transmission.... » Replacing Trans Fluid -- What is best fluid? « Previous Next »

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Bitbear
Posted on Monday, August 27, 2007 - 08:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Should I use the recommended HD transmission fluid? I'm pretty sure I've seem some suggest using regular 20-50 synth. Whatever I use, my inclination is to use synthetic.

Please share your advice and experience.

Thanks!
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Buellistic
Posted on Monday, August 27, 2007 - 09:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Bitbear:

H-D Syn3 20W50 works for me ...

My reason is the motor sprocket shaft seal ...

In BLASTing
LaFayette
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Jimrich
Posted on Monday, August 27, 2007 - 09:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Bitbear: just replaced mine today, I used RedLine 75w90 synthetic, recommended by someone I trust. If you have any trouble getting the drain plug back in after draining your tranny use a butter knife to lift the plug into the grooves then turn. Be sure not to cross thread. It was a pain in the arse to get back in. I have the stock muffler, it has a recess area for the plug, and you need baby fingers to work with the space it provides!
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Buellistic
Posted on Monday, August 27, 2007 - 10:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

If you want the lastest and greatest you must get:

HARLEY-DAVIDSON Transmission and Primary Chaincase Lubricant PART NUMBER 99851-05 !!

It is on the level of DEXTRON V(5) and the
moving parts really spin faster(easier) than with the heavy weight lubircants ...
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Swampy
Posted on Monday, August 27, 2007 - 10:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

20W-50 Synthetic, your choice.

Buellistic, thats a good reason to use the engine lube on the other side of the seal also.

There has been alot of discussion on the board about using the 75W-90 Synthetic as there was an issue with the lube being bad on the wires for the stator.
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Swampy
Posted on Monday, August 27, 2007 - 10:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Here is the link:

http://www.badweatherbikers.com/buell/messages/384 2/182748.html?1142609346
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Jimrich
Posted on Monday, August 27, 2007 - 11:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Swampy I did some more research on that it seems that the issue was with Mobile 1 75W-90 and special additives.

I also came across a really cool article:
http://www.amsoil.com/lit/g2156.pdf
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Xgecko
Posted on Tuesday, August 28, 2007 - 06:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

sulfur was part of the problem if i remember right. same issue as diesel fuel in modern engines. i've used mobil1 vtwin 15/50 for 10,000 miles now and have no issues what-so ever

(Message edited by xgecko on August 28, 2007)
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Ezblast
Posted on Tuesday, August 28, 2007 - 07:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Concur!
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