What to do about the cylinder head

[shiznizbiz]

Ok , Its an 82 gs650g. I have been dissassembling the engine to figure out the damages after i bought it for dirt cheap from a buddy.
So far, I need for sure a cam cover, and a cyclinder head.
The cam chain broke(needs replacing too) which caused the failure of the bike during a ride of ours. Now, this chain breakage put a hole in the cylinder head behind the intake cam gear, and there are several rusted-in bolts in the head that are used to hold the cam cover on. I am definitly replacing it because i dont feel like drilling out the bolts. i just dont feel like fooling with that specifically.
soooooo. If i get a new or used cyclinder head and cover, do i need to get matching internal bits with them? Like new stuff with the new cylinder head? and mated used bits with the used cylinder head fom the same used motor?
If i were to buy all used, what price would i be expectign to pay?
Anyone wanna hook a brother up? lmao!
Thanks in advance guys.

 

[tkent02]

The caps that hold the cam down on the head need to go with the head. Not really much else that really has to.

 

[blowerbike]

play your cards right and you may find an engine cheaper than messing with your own.
maybe 50.00-200.00 bucks.
broke cam chain= complete disassembly/reassembly...
woooohoooooooo!

 

[tkent02]

play your cards right and you may find an engine cheaper than messing with your own.
maybe 50.00-200.00 bucks.
broke cam chain= complete disassembly/reassembly...
woooohoooooooo!

And likely needs eight valves replaced, four pistons, and some other expensive sh:t depending on where the chain ended up.

 

[shiznizbiz]

thats what im fearing. I havent got that far down into it yet. The tear down is half educational process, half exploratory surgery. Sooo basically if by some miracle the bottom end goodies are still intact ill be ok. if I buy a cylinder head, ill need the matching caps from said donor, right?

 

[shiznizbiz]

wheretf?

wheretf?

OK, I'm about to go to the point of no return. I'm going to split the case and get down to the nitty gritty. My main question is, where can I get a gasket for the case? I've looked literally everywhere I can think of.
Im in search of two small pieces of the cam chain that went awol after it broke. Does anyone know where I can find the gasket? Any tips on splitting the case would be appreciated as well; like things to look out for etc.

 

[rapidray]

There is no gasket for the case, you use Threebond 1207B sealer on the 2 case halves. Ray.

 

[crapwacker]

play your cards right and you may find an engine cheaper than messing with your own.
maybe 50.00-200.00 bucks.
broke cam chain= complete disassembly/reassembly...
woooohoooooooo!

Could he use a 78 750? I know where he can get one!

 

[shiznizbiz]

you sir are the man.

you sir are the man.

There is no gasket for the case, you use Threebond 1207B sealer on the 2 case halves. Ray.

thankyou very much sir. just what i like, a direct answer. In that case(nopun intended), wish me luck.

 

[koolaid_kid]

You can usually find a couple of pry points around the case where you can pry them open. Be sure and check that all the bolts are out, since bike manufacturers like to hide one or two "gotchas" that will prevent splitting the cases. We want pics of the carnage, of course.

 

[Steve]

Could he use a 78 750? I know where he can get one!

Only if he does a LOT of re-engineering.

The 650G is a shaft-drive bike, the 750 is a chain. :-\\\

.

 

[crapwacker]

Only if he does a LOT of re-engineering.

The 650G is a shaft-drive bike, the 750 is a chain. :-\\\

.

Oh, I didn't know that. But I do now!

 

[shiznizbiz]

carnage!

carnage!

ok fooled you. i had several pictures from various stages of the tear down, but i accidentally deleted them. its now down to the actual moment of takign out the case bolts, and splitting it open. Good news, I found the small pieces of awol cam chain that went missing. they are still sitting there since i noticed them as i was calling it a day last i worked on it. whoopty doo.

 

[shiznizbiz]

where for art thou threebond

where for art thou threebond

There is no gasket for the case, you use Threebond 1207B sealer on the 2 case halves. Ray.

Does anyone know where i can purchase this or any equivalent product? Im trying to get supplies lined up.

 

[shiznizbiz]

nevermind

nevermind

I did a little searching. You can get the suzuki equivalent on suzukis website for $18 usd a tube. If anyone knows a better deal, inform the masses, be useful.

 

[Dogma]

Well, you can search the net for the Threebond brand. Same stuff. That one $18 tube will last years if you take care of it though. A little goes a long way. Maybe the Threebond comes in smaller sizes.

 

[shiznizbiz]

Sweet!

Sweet!

OK, for those who care, I took the time last Saturday to get the case split in half and sort out whats what. It was pretty easy. A couple of tips i have for anyone who is going to do this are as follows.
1)Use a piece of cardboard and draw a diagram(outline) of the case half as seen from the top and then one from the bottom. Then punch small holes that will represent where each bolt is located. This makes assembly 100 times easier because you wont have to try and figure out which bolt goes to what hole.
2)If your case has never been split...prepare for a slight battle with the sealant used between the two halves. Do not under any circumstances use a screw driver or pry bar on the sealing surfaces. You could FUBAR it. I soaked the seam where the halves meet with PB blaster's penetrating catalyst. I sprayed it once, waited 10 minutes, came back and did it again and waited another 10 minutes. That stuff helps a ton. I recommend it for any stubborn gasket removal. The stiff disintegrates styrofoam cups in a matter of minutes after all.
Im not experienced with any motor other than the gs650g's as of now. so take the following as is. There are two "pry" points on opposite sides of the engine case. One at the towards rear left and one towards the front right or visa versa. Ill take pictures once i get home this weekend.
These specific spots are not at all a part of the sealing surface. There is a couple of things you can do here. One method, which i used, was to pry at these points with a small pry-bar to split the case a little. Once a small gap was made, I used a dead blow hammer and a plastic wedge, working my way around the case to gradually and evenly separate the halves. (please use common sense and do not hammer away at any location where you may hit any of the vital parts located inside)
Another method would've been to use a bolt through the hole in the top of these tabs I'm calling pry points. Those tabs are attached to the top case half. Then under each one is a small u shaped channel attached to the bottom half. It appears they could hold a nut for said bolt. If you use a perfect sized nut with a long enough bolt, and tighten said bolt, i think it could work better than the hammer and wedge method. IMO I believe that's what these two tabs were desiged for. I would've used this method myself if i had a nut laying around that fit in the channel. Blah blah would've could've should've.
Regardless, Its fairly easy. From my experience so far, it's only intimidating at first. But once you get it spread apart, as far as the internals go, youll find that there are few moving parts. And all of it is grouped together very simply. You have your Crankshaft assembly with connecting rods and alternator attached. Then you have your tranny gears which are pretty much two spindles of gears. And the you have your secondary gear for the output shaft.

My next step in this endeavor is to clean all the sealing surfaces and inspect the moving parts to make sure they are all within tolerances. I may leave the inspection process to a shop. Depends how frisky i get. Ive already cleaned everything else and recovered the awol cam chain links. Once all that is completed, Its assembly time. I cant wait. The only way Ive been able to rationalize my laziness and soothe the pain of not having ridden her yet is telling myself its too hot and humid to ride. Which is true. 90's with hellish humidity isn't fun with ATGATT. Thats why i love fall. Spring like temps without the allergies. Plus very beautiful colors. Anyways, Ill get around to posting the pics sometime this coming weekend.
Til next time
On a side note, I may end up moving this to the rebuild section of the forum.