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Can anyone identify this spring? Gs750

  • Thread starter Thread starter Danb4563
  • Start date Start date
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Danb4563

Guest
So I've started to clean and freshen up a spare motor I have. The motor is from a 79 gs750. I've pulled the top end, removed the pistons, and I've started cleaning the lump to get it ready for paint. Last night I rotated the engine on the stand and this spring fell out. I can tell where it came from, or if it's even supposed to be in the motor at all, or if the PO dropped it in there by accident when he rebuilt the motor. The this is, this spring is rusted, which leads me to believe that it is not an internally lunricated engine part. Any ideas?image.jpg
 
The same thing had crossed my mind, but this is a very light gauge spring, much lighter than the clutch springs. The rust is throwing me for a loop. If it weren't for the rust on this spring I would be sure it's supposed to be in there, but due to the rust I'm really not sure.
 
Too short to be cam chain tensioner spring. Too big to be a starter clutch spring. Could be an inner valve spring?
 
Hmm. This is fun. Ok, it's a little short to be the cam chain tensioner spring, and far too light of a gauge to be a valve spring. I checked the diagram supplied by Chuck, I think I can rule out #17 since this spring doesn't have hooks on the ends, ad it doesn't look like they broke off. Which spring is #20? Is that the neutral pin spring? Is there a way I can check that without splitting the cases?
 
Its a pin that hits into the detent on the shift drum when selecting neutral and holds it there. Look at the rear center of the tranny housing and see if theres a big nut ( 16 MM or so ). If there is then unscrew it and take a peek down there with a flashlight. Sort of like a big nut that one would think "wonder why they put a nut here and whats it bolted to"

If not then the bolt holding it all in is inside the oil pan cover next to the oil pick up screen...which would explain why it came from inside!!! may find the pin and bolt laying in there too.
 
It is too big of diameter to be the neutral detent spring. I would say that it didn't come from the motor.
 
Probably right. Kinda hard to gauge size but i was trying to imagine it by looking at my hand. there are only 3 internal springs that I can think of like that ( round coiled ) of so..........................and its definitely not from the clutch basket.
 
But you said it was rusty???? seems if it was inside and in an oily environment it wouldnt get rusted..but hey dont hurt to check..other than if you have to open the oil pan youre gonna ruin the gasket.
 
Thanks for the help guys, but it doesn't matter much anymore. Once I took a good look inside of the bottom of the motor I noticed a crack where someone over tightened one of the lower mounts. There was no leak, but there is definitely a crack. This motor isn't worth building. I'll keep the top end, and throw the lump under the bench. Maybe I'll need something from it later, or maybe I'll stumble on a case.
 
You can split the cases and just have it welded shut from the inside...no bigggy in the rebuilding process. just a little hickup.

They cant over tighten the bolt if its in the correct side. 2 different lengths. Yes they ARE side specific.
 
The spring might be a remnant of one of the springs Suzuki put over the fuel lines or brake lines to protect them.
 
The spring might be a remnant of one of the springs Suzuki put over the fuel lines or brake lines to protect them.

This is the cam chain tensioner spring; that obviously ain't it:
cct_05_pushrod_out.jpg
 
The fuel and brake line springs are longer than this one. The pictured spring is not a piece of a longer spring, you can tell by the doubled up coils on both ends.
 
I think at this point it's pretty safe to assume that the spring was not supposed to be in there. The size, gauge, and level of rust on the spring ruled out any possibility that it was supposed to be in the motor, and since one of the POs rebuilt the motor I have to assume it was inadvertently dropped into the motor at that time. I'm going to look into the cost of welding the case, but I'll likely just source another case if the welding option is too expensive, after all this motor is only a 750, and it's a spare.
 
I've never been inside a GS750 engine, but I can say there is no spring like that in a chain drive GS1000 engine.
 
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