FD XS750 swap Questions

[jjwaller]

Hi Folks:

Found a good condition 750 FD unit, so I'm going to do the swap. Couple of questions though.
I have been studying Maximans wonderful write-up in depth and wanted to know:
1. Sealing the spooge holes in the FD is the only reason to take off the pinion nut?

2. After re-torquing the pinion nut, how do you go about checking the Bearing Preload?

Sorry, only have a Clymer's manual and this group yo look up tech stuff. The Clymers just says to take the FD unit to the dealer. No help at all.

Thanks Much
John

[jjwaller]

One more Question.

Haven't taken the 11 down yet so don't have anything to measure.

Is the xs750 driveshaft too long to use in the XS1100 with the Mod? Judging by the length of the spacer in the Mod I assume that is the case but wanted to check.

Oh just had a thought, or are the splines different on the driven end?

Never really said in the article.

Thanks
John

[red bandit]

The 750 shaft is to long. On plugging the holes I found a couple brass bolts that were a snug fit (to tight might crack it), cut the heads off, put in some RTV, pressed in the brass bolt, used original washer. Before I disassembled I used a paint marker and maked the threaded stud and nut so I got the nut at the same spot/tightness. This ONLY works if you don't add the washer and ONLY use the original washer. If you tighten the nut to much you WILL ruin the bearings.

[DiverRay]

I put a different washer on mine. I just tightened down the nut until the play was out, but the shaft would still turn easily. DO use the XS1100 shaft, with the spacer on it. I have about 30K miles on my final drive, and it's still working well.

[xschop]

I 2nd Ray

I snugged mine down, until play was gone , then gave a 1/4 turn. I originally used high temp silicon gasket maker in the spooge holes and the large washer to keep from blowing the silicone out under FD internal pressure ( it does get warm, but not as much as the XS11 FD).......You can only use the xs11 shaft with the spacer, the 750 U-joint splines are different. And the XS11 FD splines are beefier/better. Grease them before you reinstall because the xs grease-zert sucks at getting the grease into the union......chop

[jjwaller]

Thanks much guys.
Figured that was the deal with the 750 shaft.

[rover]

I did not plug the spooge holes. I used the recommended washer, made a gasket the same size. About 8 K miles, and no leaks or problems. I used 1/16 thick gasket paper

[stoked]

Lay your wheel on the floor and spin the FD on it to get an idea of how much resistence there should be. That will at least give you a vague reference when you initially tighten it down. If I recall there is a torque range and it's pretty high. While to tight is bad, to loose is bad too. From my days with chevy rear diffs, if you gon't get the pinion back where it was before you loosened it, they like to wear the gears shortly after. That being said, I'm pretty sure mine is not exactly at the same spec as when I took it off and I've put thousands of miles on it since swapping with no issues.

[randy]

jjwaller;

Below is a link to the Shaft Drive Service Manual. Download it, it's in .pdf format. It has all the info you never wanted to know about preload, torque, etc.

P.S. you'll read that there ar two types of drive, Type I and Type II. Type II has a lock screw to hold the pinion housing, Type I doesn't.

TC - please download this and make it part of the tech tips. Thanks.


Shaft Drive Manual

[bikerphil]

pinion nut

I've done 2 of these mods. I just broke the nut loose with 22mm socket on ratchet. They both broke loose fairly easily. When I tightened them, I snugged them up good, about the same force I used to break them loose. Used threadlock blue on the nut. 5k miles on one and 3K on the other. No problems whatsoever 'cept for speeding tickets.

[jjwaller]

Shaft Drive Service Manual

Randy:

Outstanding. That's exactly what I needed. Feel much better with all the official info!

Rover:

I like that gasket idea much better. That's what I'll do.

Thanks all for ideas and tips everybody.

[jjwaller]

Thanks for all the help and info.
Got it installed this evening.
Bike feels just great. About an 8 MPH drop at given RPM. Just a quick ride, but it feels great.

Thanks everybody.

John