750 Final Drive Conversion

[magnum440]

I was wondering if anyone has the pictures that go with the 750 final drive conversion in the modification section?

[TopCatGr58]

Hey there Magnum,

Glad to see you got logged on! That tech tip was made a while back, and the owner of the photos that had them stored off site was relieved of his privileges, and he took his photos down. However, I had saved them, and then uploaded them to the sites server during the UPGRADE that happened last year. They are included in the NEW tech tip that you can find from the DROP DOWN menus at the top of any page....XS11 Info, Tech Tips, Mods, Tranny.....! I just didn't want to bother RELINKING them in the old Forum version of the tech tip.

I thought I had put a LINK and reminder in the OLD FORUM tip about finding the photos and such in the drop down tech tips!? I'll check to see if it's still there, but pretty sure it is!
T.C.

[magnum440]

Thanks. I should have just looked around a little on the site. I just picked up a 750 fd on eBay. Hope to try this out before to long, if work will allow enough time. I also changed my email to a Yahoo account. Maybe that will work better

[TopCatGr58]

IF you edit your user info and change your email address, the site will put you back on awaiting email confirmation status, and will send a NEW confirmation email to the new email you editted, so be sure you type it correctly, and then check it for the confirmation email, open, and click on the enclosed link to be re-registered, and your status will then be REGISTERED again!
T.C.

[fredintoon]

Will it work the other way too?

My son has an XS750 that he's thinking of putting a sidecar on.
Just because the swap works one way don't necessarily mean it'll work the other.
Will an XS11 final drive swap into an XS750?

[dbeardslee]

Fred - My guess would be maybe to no. The drive shaft's aren't the same length. When going to the 750 rear end on an 11 you put a little bushing (17mm) on the 11 drive shaft to get the extra length. Don't know how you would shorten the 750's. Then again, you might be able to use an 11 drive shaft, but I don't know if that will fit.

the owner of the photos that had them stored off site was relieved of his privileges, and he took his photos down. However, I had saved them, and then uploaded them to the sites server during the UPGRADE

Devlish clever, you administrators .

[rman]

XS11 final drive

Hey, I was wondering the same thing about transferring the 1100 final drive onto the 750. Any ideas that if it is feasible and what the change would do for performance?

I have two non-running 750Ds sitting around and was just wondering.....

[DiverRay]

On the final drive side, the BIG difference is the 750 has the seal on the drive shaft. I would think if you greased the splines BEFORE assembly, and checked the over all throw with the 750 shaft installed, it SHOULD work! You my have to "adjust" the shaft length, but it should NOT be that big a deal. I could be wrong, but then I have NOT tried it as of yet.

[Texas Rookie]

seems like when I looked at the splines on the 750 and 1100 shafts during my swap, they were definitively different sizes so I don't think the reverse swap will work with the 11 shaft into a 750 middle drive. shortening the 750 shaft raises strength and balance issues previously addressed. Besides with the extra weight and rolling resistance of a sidecar, i would think the last thing you would want to do is raise the gearing on the 750. seems like it would need to be shortened even more but what do I know. TexasRookie

[dbeardslee]

And on top of that it's made out of really really really hard steel. Don't know if the swing arm and u-joint could make the transition, but I'm thinkin' that's about the only way to swap 'em. Don't know that you can really shorten the drive shaft without taking something out of the middle - which is a bad idea. The end that fits in the u-joint is the only one you might think about modifiying, but all that's going to do is reduce how much spline is engaged by the u-joint. I don't think it will go in past the splines.

[xschop]

willitfit

yeah, it'll swap over. You just have to remove the XS750 driveshaft to FD seal, because the XS11's FD splines extend all the way to the end whereas the XS750's FD splines do NOT. That is the reason for the bushing when putting the 750 FD on the 11.......

[rman]

The results of such an exchange?

Thanks for the information; I may try it once I get the 750s up and running again. I still would like to know what effect it would have on performance. Would it give the bike more low end torque in exchange for higher RPMs at cruising speeds? I am guessing here anyone else with more experience would probably have a better idea.

[xschop]

draggin'

You answered the question. I looked all this up and IIRC. the XS750 when it went from model D to E changed the """MIddle Drive"""" to a higer ratio to get a quicker off the line start. Put on the XS11 FD to the 750/850 and you have a drag race upper hand.

[rman]

Win-win

Thanks XSchop, you confirm what I have read after searching the Triples site.

Pat Kelly says
"Using the 1100 final drive on the triple will make your triple quicker off the line. Yamaha used that gear ratio to get the 1100 into the 11 second bracket to make it the fastest production bike in 77.
So if you want you triple to be really quick (but will sacrifice some top speed) then use an 1100 final drive."

I think that it would be really cool to swap my XS1100 and XS750 drives, it sounds like a win-win move. I would get a better big cruiser and a quicker smaller bike for the back roads.

[dbeardslee]

rman - I wonder if you could just take the entire swing arm assemblies with the FD's attached, and move them from bike to bike. No muss, no fuss.