Mystery part found in the sump

[gdayjr]

I am doing a full restoration on a 1981 GS1000G.
I took the sump off to make sure all was well.
The engine was bored out to 1100 cc around 4000 km ago.
The guy i bought it off did not do a thing to the engine after the re bore, just rode it.
I will be re jetting the carbs due to huge flat spot as well.

So, among all the sludge and grime in the sump, was hundreds of little piece of some sort of gasket, and assorted other junk, was what looks like a small roll pin.
I am not sure where it would have come from, or just how important it might be.
Any one got any idea, what this is, and where it might have come from?

 

[gdayjr]

This the condition of the sump the roll pin came from.
Probably one of the dirtiest sumps i have ever seen on a motorcycle in my life.

 

[Guest]

The mystery part looks like a needle bearing out of a Kettlerad. Someone from around here bought one in Germany a few years ago and rebuilt it. Designed with two Caterpillar like tracks to bring the German soldiers into Russia where there were no roads. The man who rebuilt it said it had 10,000 needle bearings. He was handing them out and I have one .... somewhere. Might see him again this summer and will take some pics. Pretty neat looking with a 750 cc engine that it would take several hours to get to, just to service.

 

[chuck hahn]

Guide from one of the cam journal caps if I was to guess.

 

[Agemax]

Guide from one of the cam journal caps if I was to guess.

Far to small for one of those, its only 5mm long.

 

[chuck hahn]

Didnt see the thumbnail. He said it looked like a roll pin and they are hollow so i made that connection. Thats one great thing about a GS engine..whatever goes down the cam chain tunnel just hits the pan..usually. Someone years ago had a circlip from a wrist pin jam up a cam chain though. One of my planned buys is a good endoscope.

 

[TeamDar]

Looks like a bearing race pin from one of the transmission bearings or the ignition side cranckshft main bearings. Used to keep the outer race from rotating in the cases.

 

[blowerbike]

shift pawl plunger?

 

[blowerbike]

starter clutch plunger....hell i can't tell from the picture:uncomfortableness:

if it's a roll pin then i'm with Dar...

 

[GregT]

It's definitely a roll pin - not a cam cap dowel or a factory bearing locating pin.Those pins are solid.
It's got damage to one end which makes me wonder if it has been used as a replacement for one of the main bearing locating pins.

 

[roeme]

View attachment 54508
This the condition of the sump the roll pin came from.
Probably one of the dirtiest sumps i have ever seen on a motorcycle in my life.

Good grief, that looks nasty.

 

[TeamDar]

It's definitely a roll pin - not a cam cap dowel or a factory bearing locating pin.Those pins are solid.
It's got damage to one end which makes me wonder if it has been used as a replacement for one of the main bearing locating pins.

Transmission roller bearing outer races have a roll pin in them. Dar

 

[GregT]

Transmission roller bearing outer races have a roll pin in them. Dar

Yes - but about 2mm OD. That looks to be about 5mm which would be right for the mains.

And yes, the needle rollers on the blind end of the gearbox shafts also have 5mm solid pins in as locators so it could have been from there also.
Either way, it's not an OE piece.

 

[TeamDar]

Yes - but about 2mm OD. That looks to be about 5mm which would be right for the mains.

And yes, the needle rollers on the blind end of the gearbox shafts also have 5mm solid pins in as locators so it could have been from there also.
Either way, it's not an OE piece.

Do you not see the picture of the pin sitting on a scale? The length of that pin is 5mm long and looks to be 2mm in diameter....