16 valve 750 front sprocket washer

[Guest]

1981 750L
While pulling my old front sprocket off the bike to replace I noticed two washers as opposed to one.
The part diagram from PartsShark shows only one, part #43.
I took a few pictures of the parts to help explain and hopefully find some answers.

The first three are the part that is causing me the most confusion.







As you can see it is concave.
It will fit as far back as the geared section in front of the sprocket spacer with the sprocket spacer off the shaft.

My first question is if anybody can identify this part?

My second question is if the part looks to be in the correct shape?

My third question is if it belongs directly in front of the sprocket spacer with the concave recessed into the spacer?

Here is a photo of the diagram part number #43 which is different.



And another one showing my take on how 43 sits on sprocket spacer with the inside grooving fitting on the concave of sprocket spacer.


Would that be correct?

[mrbill5491]

Okay, a bit confused here, I looked at the 750L parts fiche and it seemed odd to me. I then went and looked that the same year model but it was the E model. That I recognized. The L and E use the same motor/transmission set up sprocket and all. I'm thinking the L fiche is wrong, part #43 goes behind the nut not the sprocket as it is pictured on the L fiche. The washer has to be bent over the nut on both the L and the E, at least that is what I'm thinking because it does on my E. Your large washer I've never seen before. Look at the E part fiche, you'll see what I'm talking about. Does the L use a slightly different setup? I don't know now, not sure why it would.

Just for giggles, I took a look at the 1100 L and E. The L shows no large washer where the E shows the washer just like the 750E does, behind the nut. So, something is askew with the fiche? The thin washer you are showing in your pics is used on all four models.

I'm actually surprised you found this on PartShark, I thought they lost their Suzuki Franchise. I got a notice from them saying they would no longer be selling any Suzuki anything.

[gearhead13]

I dont know. My 4 valve 750 had a different setup:

http://www.partshark.com/fiche_section_detail.asp?section=94886&category=Motorcycles&make=SUZUKI&year=1982&fveh=2137

Does your sprocket have the stock type setup? With the the metal parts screwed on either side?

[mrbill5491]

I dont know. My 4 valve 750 had a different setup:

http://www.partshark.com/fiche_section_detail.asp?section=94886&category=Motorcycles&make=SUZUKI&year=1982&fveh=2137

Does your sprocket have the stock type setup? With the the metal parts screwed on either side?

Yours' is just like the 80/81 GS750E and the 1100E.

[Crankthat]

Thank you MrBill.
I see what you are referring to.
The parts fiche matches what I found upon disassembly not including my extra part.
If you took another look at the 750L fiche as compared with the 750E you will see a difference in the way the sprocket nut is kept from loosening.

Parts 46, 47, and 48 bolt into the shaft to lock the sprocket nut in place, much like a one nut is tightened to another to keep them from twisting off.

The L model uses that as opposed to the washer that you would bend to the crown of a nut to keep it from spinning off.

I am still confused.
I started to think after viewing the E model that the frame difference possibly needed shimmed to align?
Then thought possibly they would do that with a size difference in the spacer.
Then thinking not a good idea in case the different size spacers were confused in a shop.
Possibly used as a shim then and the first guess was correct.

Any thoughts on this anyone?

[Crankthat]

I dont know. My 4 valve 750 had a different setup:

http://www.partshark.com/fiche_section_detail.asp?section=94886&category=Motorcycles&make=SUZUKI&year=1982&fveh=2137

Does your sprocket have the stock type setup? With the the metal parts screwed on either side?

Yes both the original and the replacement.

[Crankthat]

Been thinking on this a bit more and I think I have the answer.


The sprocket on the left is facing the way shown in the part fiche for my model 750L.
The sprocket on the right is as pictured installed on all the rest.

If you will take note in the different diameter bore facing one side as opposed to the other.
Having the larger bore size against the washer that is turning on a sprocket spacer that is not turning has worn through the washer in question and separated it into two pieces?
I will not know the answer until i order a new washer in and check the size.
But then mocking up the parts on the shaft without the spacer leaves me with a sprocket nut that recedes into the larger bore and a locking bolt that will not jam the nut as it is made to do.
Having the larger bore facing the engine with the spacer behind it leaves the sprocket nut outside the smaller bore and the jam bolt would work as it is intended.
That though leaves me with the possibility of tightening the sprocket nut to much and bending the washer back causing the sprockets to be misaligned.

When I get my chain together my new to me swing-arm installed and a new washer I will still need to figure out the correct side to install the sprocket.

Beginning to have more incite into the mind of TKent

[mrbill5491]

Thank you MrBill.
I see what you are referring to.
The parts fiche matches what I found upon disassembly not including my extra part.
If you took another look at the 750L fiche as compared with the 750E you will see a difference in the way the sprocket nut is kept from loosening.

Parts 46, 47, and 48 bolt into the shaft to lock the sprocket nut in place, much like a one nut is tightened to another to keep them from twisting off.

The L model uses that as opposed to the washer that you would bend to the crown of a nut to keep it from spinning off.

I am still confused.
I started to think after viewing the E model that the frame difference possibly needed shimmed to align?
Then thought possibly they would do that with a size difference in the spacer.
Then thinking not a good idea in case the different size spacers were confused in a shop.
Possibly used as a shim then and the first guess was correct.

Any thoughts on this anyone?

Why the hell Suzuki did it that way is beyond me. The motors are the same unless there is a slight offset to the rear wheel on the L.

[Crankthat]

On to the two washers.
It was one worn thru to two.

[Crankthat]

Now for the new insight/question.

I have owned this bike for several years now and have always had problems with my chain and sprockets.

Have gone through a few sets.

This has been my latest attempt to correct any problems for good.

Replaced the washer pictured above.
Chain and sprockets.
Swingarm.
Cush drive.

My observations with the above washer are that the washer and spacer that fits behind it do not spin.
The sprocket and shaft spins.

Now everything was put together this afternoon.

Though I can get my chain to run in a straight line It always rides to the outside of the rear sprocket and will not sit in the middle.

This is the problem I have been trying to fix for a few years now.

Tomorrow I will try and space the front sprocket out more then the clearance I find with the replacement washer and see if I can get my chain to run without any opposing force on the two sprockets.

Any insight or pros or cons on what I will attempt would be appreciated.

[Crankthat]

The only washers I have handy with a ID large enough are to thick!

A insight into a earlier post #7.
The sprocket nut fits well into the bore and the larger washer on the bolt that goes into the shaft actually pushes on two clips molded into the sprocket nut and tightens them to the shaft threads therefor not allowing the nut to spin off.