750/850 Final Drive Mod

[MPittma100]

I have read the post on the final drive mod several times and have some questions:

Can the 750/850 drive shaft (with oil seal) be used in the XS1100 swingarm with the FD mod?

OR

Can the 1100 pinion support be switched into in the 850 FD and use the 1100 drive shaft without spacer?

[DiverRay]

Mike,
I don't think anyone has tried either one. If the splines line up, the drive shaft SHOULD work, but you will need to check overall length to verify. I do know the middle gear and final drive are covered in one manual for both bikes. With Yamaha, this MAY be that they are the same.
Once I can find a round tuit like 3phase did, I can try out a few ideas myself.

[BA80]

No, the 750/850 shaft is shorter.

I think I have both out in the garage. If I do I'll post a pic of the difference.

I thought Cody did that in the instructions. The shafts are completely different though. I know that for certain.

[kboehringer]

850 Final Drive Available

I have read the post on the final drive mod

Mike,
If you decide you want to move forward with one of these mods, I have an 850 final drive you can have. It is in good condition but of no interest to me. I was planning on tossing it with a large bunch of other XS11 extras on my next trip to the local dump. Let me know before it heads to the dump.
Kurt

[MPittma100]

850 fd

Mike,
If you decide you want to move forward with one of these mods, I have an 850 final drive you can have. It is in good condition but of no interest to me. I was planning on tossing it with a large bunch of other XS11 extras on my next trip to the local dump. Let me know before it heads to the dump.
Kurt

Hi Kurt,

I will take it. Save it for me please.

Thanks

[3Phase]

I have read the post on the final drive mod several times and have some questions:

Can the 750/850 drive shaft (with oil seal) be used in the XS1100 swingarm with the FD mod?

Mike, it can be done if you throw enough time and money at it but the '1100 drive shaft and coupler move/flex too much under load for it to last without shredding the seal.

It'd work fine if all you ever did was ride to Walmart to buy tube socks and beef jerky.

OR

Can the 1100 pinion support be switched into in the 850 FD and use the 1100 drive shaft without spacer?

No.

The spacer keeps the drive shaft in the correct position, the tension/anti-rattle spring in the coupler will pop the drive shaft out of the splines before you can bolt the final drive back to the swing arm.

If you take out the spring then you might get lucky enough to put it together but the shaft will pop out of the splines the first time you put the transmission in gear.

All you can do after that is take it apart and do it over again with the spacer or go back in the house and sit in front of your computer while making motorcycle noises.

[3Phase]

Mike, it can be done if you throw enough time and money at it but the '1100 drive shaft and coupler move/flex too much under load for it to last without shredding the seal.

It'd work fine if all you ever did was ride to Walmart to buy tube socks and beef jerky.



No.

The spacer keeps the drive shaft in the correct position, the tension/anti-rattle spring in the coupler will pop the drive shaft out of the splines before you can bolt the final drive back to the swing arm.

If you take out the spring then you might get lucky enough to put it together but the shaft will pop out of the splines the first time you put the transmission in gear.

All you can do after that is take it apart and do it over again with the spacer or go back in the house and sit in front of your computer while making motorcycle noises.

Reposted from the reply to the question in my Profile because no one ever reads those stupid things anyway:

(sigh) I had all of this photographed and documented but I closed my Flickr account. I'll have to find the pictures.

The XS750 final drive slightly weaker than the XS850 drive, they're both weaker than the XS1100 final drive.


The '850 has an axle support brace in the right-hand side of the ring gear to keep it from flexing and destroying the bearing.




Notice that the axle tube in the XS750 final drive is not supported




To plug the oil holes in the '750/'850 coupler, I used JB Weld and a couple of fluted aluminum sheet metal nails with one side of the head clipped.










XS11.com Forums > Idle Talk Forum > XS11/XJ11

Variation of the 750/850 final drive mod

[BA80]

That looks like the hard way.

I've been running the original mod (with an 850 FD) for almost 8 years and estimated 80K, maybe more, now without issue.

I love this mod.

[MPittma100]

FD Mod

Mike, it can be done if you throw enough time and money at it but the '1100 drive shaft and coupler move/flex too much under load for it to last without shredding the seal.

It'd work fine if all you ever did was ride to Walmart to buy tube socks and beef jerky.



No.

The spacer keeps the drive shaft in the correct position, the tension/anti-rattle spring in the coupler will pop the drive shaft out of the splines before you can bolt the final drive back to the swing arm.

If you take out the spring then you might get lucky enough to put it together but the shaft will pop out of the splines the first time you put the transmission in gear.

All you can do after that is take it apart and do it over again with the spacer or go back in the house and sit in front of your computer while making motorcycle noises.

Ok, got it. Use the 850 FD and 1100 driveshaft with spacer. Do you still use the spring between FD and end of shaft?

[red bandit]

Yes use the spring. That keeps the driveshaft engaged in the yoke at the middle drive. FWIW I have had the 750FD for years and haven't had any problem.

[3Phase]

The yoke mod is an option, if you don't want to do it, then don't do it!

We've already had this discussion before, I welded mine because I could, because it's stronger, and because the pieces can't possibly fall off or get separated.

I have a pile of the things so it also makes it easier for me to remember which yoke goes with the modded dive and which ones are stock XS11 yokes.

[Bonz]

I too, had the 750 FD. I bought from another member off his bike before it went on my bike. Keep the FD fluid changed and lube the spines when you change tires.

Ride it and forget it.