Gs1100 Cam Chain Broke at 8k.

[gs1150streetracer]

Hi GSR
Well last weekend was not the best of times,My 82 GS1100ED had a rocker adjuster screw come lose on an engine with Wiseco 1166 kit with a fresh 1150 head ,the bike ran about 10 times drove it twice and then then bike just died like I blew a fuse,I went to turn the starter over and it spun way to fast,knew I was in trouble.Got bike home and tore it apart and it was ugly.I did tighten the adjuster screw nuts hand tight with a 1/4in drive,but did not use a torq wrench to 8.4 ft lbs like Suzuki calls forWell GSR ok now for the questions.
Do the pistons look like they can be salvaged some are perfect?
Are these stock welds on the crank?
What should I do while the cases are split anything to keep an eye out for or an easy replace?
Any help would be great

 

[Flyboy]

OUCH.... that looks sore, the pistons look alright, I have seen worse, although you are in for a couple of valves there.
Be sure to check the con rods for straightness, there is the outside chance that there may be a bent rod, but I doubt it, better to just check, all the same.
not sure what that broken thing between the crank webs is.....
What else can you do while you are in there, how long is a piece of string....(see, how much do you want to spend)

Does not look that terminal, should be up and riding in no time, keep us posted.

 

[posplayr]

that chain says DID ; is that stock or swapped out when you did the 1166? Was it a continuous chain or riveted?

The plugs look like it was burning well.

 

[gs1150streetracer]

that chain says DID ; is that stock or swapped out when you did the 1166? Was it a continuous chain or riveted?

The plugs look like it was burning well.

Jim thanks for the reply the it was a continuous stock chain from what I can tell I never had the cases apart?,the bolt went down ontop of the crank gear thats what caused the chain to snap im thinkin?The bike was running GREAT before bolt let lose,I got a few good garage revs out of it and 2 good blasts down my street,could of been worse..lol

 

[Guest]

Damn!
What a bummer.
Get it back together with a HD chain and a manual tensioner.

 

[gs road racer]

Don't think those are stock welds...factory is much prettier!!Ouch that sucks yes looks like the bolt caught in the worst place at the bottom where the cam chain slipper fits, it blasted that apart and took chain with it. Take it ALL apart and inspect clean it thoroughly. Valve job at the least. I'd want to be sure the pistons are ok find a place that does NDT testing they should be able to tell you if they are. Easy for them to check for cracks with ultra sound. After all they did get smacked pretty hard.

 

[blowerbike]

you have to...\
i repeat.
you have to crank down the adjuster nuts so this does not happen.
they are tough for there size....no torque wrench stuff...just a box end wrench and A LOT of pressure used to tighten.
i have seen this many times..damn shame.
good luck on getting it back together.
let me know if i can be of any assistance.

 

[posplayr]

you have to...\
i repeat.
you have to crank down the adjuster nuts so this does not happen.
they are tough for there size....no torque wrench stuff...just a box end wrench and A LOT of pressure used to tighten.
i have seen this many times..damn shame.
good luck on getting it back together.
let me know if i can be of any assistance.

yea I bet I put 20-25 ft-lbs

I use large plyers to hold the knurled handle and my bare hand about as hard as I can on the lever.

http://www.z1enterprises.com/products01/Valve-Rocker-Clearance-Adjustment-Tool.aspx

 

[gs1150streetracer]

you have to...\
i repeat.
you have to crank down the adjuster nuts so this does not happen.
they are tough for there size....no torque wrench stuff...just a box end wrench and A LOT of pressure used to tighten.
i have seen this many times..damn shame.
good luck on getting it back together.
let me know if i can be of any assistance.

Hello and thanks for the reply,Do the pistons look worth another try?Could I clean them up with a dremel tool or?how much damage do you think happed to the head/guides (1150 stock head)?Any help would be great.Thanks

 

[gs1150streetracer]

yea I bet I put 20-25 ft-lbs

I use large plyers to hold the knurled handle and my bare hand about as hard as I can on the lever.

http://www.z1enterprises.com/products01/Valve-Rocker-Clearance-Adjustment-Tool.aspx

Nm misprint..Ill have to buy one of these

 

[gearhead13]

yea I bet I put 20-25 ft-lbs

I use large plyers to hold the knurled handle and my bare hand about as hard as I can on the lever.

http://www.z1enterprises.com/products01/Valve-Rocker-Clearance-Adjustment-Tool.aspx

I bought one of those as well, quite handy. Except for the one adjuster near the cam cap that it wont fit on the nut, I use a 9mm wrench on those ones.
That really sucks, to have that much damage from one little adjuster coming loose, I guess thats why my po loctited my adjusters.
I am putting my 1166 together soon, ordered a heavy duty chain and guide from APE, maybe a HD chain would have faired better?

 

[rapidray]

Rich, deburr any sharp edges on the pistons & reassemble with a Tsubaki cam chain. That looks like an early crank that someone welded up. DEFINITELY not done by Gardner or Pierson! X2 on the rocker nuts being tight, but not so tight you hurt the threads. Let me know if I can help. Is the cam chain sprocket on the crank ok? Make sure you look at EVERY tooth really well!!! Ray.

 

[Guest]

Those pistons look usable to me.
Looks like you are on the lean side.

 

[blowerbike]

Those pistons look usable to me.
Looks like you are on the lean side.

LEAN IS MEAN!!!
FYI
do not lock tite the adjusters!!!!!!!!!!!!!
just get the mo-fo's really tight..not limp wristed tight.

34-35 degree's of timing max.
not 40-50 if you get what i'm saying

 

[Nessism]

Wow, that really sucks!!

Just me of course but I think I'd use a torque wrench after you hand tighten the adjuster nuts just to be sure you have the proper feel.

Good luck getting it back together.

 

[rapidray]

Ed, educate me because it apears you know something I don't & I specialize in 16 valve engines. How are you supposed to hold the adjuster screw & get a socket over the nut to use a torque wrench? I have done valve adjustments on 16 valvers a couple of times & KNOW you need to hold the adjuster screw to keep it from turning while you lock down the nut. So.......... how do I use a torque wrench on it? Just curious & always looking to learn something. Ray.

 

[sparki]

i thought the same.... just nip em up and give a lil extra tweek.... again, no girlie tweek but a bronto related muscle bike kinda tweak - chances are that'll be more than the "recommended" torque setting anyway.

i once torqued up my camcover to the recommended settings... leaked all over the place. used the "feel" and it was fine after a lil fettling

just my 2p worth and may not be worth much over the years you get a feel for what is tight and what isn't. sometimes a recommended torque setting just doesn't fewel tight enough and a little tweek is needed. as i say, this is my experiance and others may well vary. please don't take this as gospel as i'm sure it isn't and others may disagree.

good luck ... doesn't look too bad, all things considered

 

[Guest]

You probably know this but they sell aftermarket cam chain guides that will last forever. Not that it would of stood up to a cam adjuster screw doing 300 mph inside the engine. You can only replace them when you have the barrels off. Keep us informed and great photos.
Curt

 

[Guest]

http://gszone.biz/sprockets.html

 

[Texasgs]

re

re

Those pistons look pretty good, I would be sure the top ring groove is to spec. I have seen the top of the piston crimp down and make the top ring groove to tight. You are probably OK, just check it out.