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TWO Broken Rocker Arms. GS700E.

  • Thread starter Thread starter kirkn
  • Start date Start date
A few people here have done split chains and I've never seen any reports of catastrophic failure from them.
 
Broken rockers means the valves hit the pistons and a broken cam chain means there could be all kinds of various damage lurking. Sounds like you are wasting time when you should be pulling the head off at minimum and splitting the cases if you want to do the job right.
 
Well, I haven't WASTED any time at all yet because every step I've done so far would've been required anyway.

This bike was completely new to me with an unknown problem described by the PO.

I've pulled the head cover to have a look and found the broken rockers.

I pulled the carbs to remove the auto cam tensioner.

I pulled the intake cam and found the broken cam chain.

In your opinion, how SHOULD I have proceeded?

My next steps will indeed be to pull the head and cylinder block. If I do pull the engine and split the cases, this would be necessary and I'd rather do all this with the motor in the frame so the semi-stripped engine will be easier to lift out...

:)
 
Okay, maybe "wasting time" was not the best choice of words on my part. Sorry to have offended. What I should have said is to just get busy pulling the head and cylinder at this point. You can replace the cam chain without splitting the cases; you will have to peen over the pins when you join the chain together. Just make sure to do a very careful inspection of the engine and surrounding parts because broken cam chains tend to cause all kinds of destruction.
 
No harm, no foul! :)

Yep, that's today's plan - pull the head and cylinder and have a look down in there. Right after I cut the grass, and help my daughter's dance team car wash... :)


How do you remove the chain tensioner blade? The front one (exhaust side) seems to just lift out. Is it the same for the rear one?

Thanks,

Kirk
 
I've never worked on that particular type of GS engine but typically the front one pulls straight up and out, rear is attached at the bottom so you need to pull the cylinder to gain access.
 
WOW
some more rock solid advice:eek:
i will be an observer on this thread and possible catastrophe.
split the cases and do it right or pick up a used engine for 100-400 bucks.
 
WOW
some more rock solid advice:eek:
i will be an observer on this thread and possible catastrophe.
split the cases and do it right or pick up a used engine for 100-400 bucks.

Instead of jeering from the cheap seats, please bestow upon us heathen what thy would do and why the course of action suggested so far deserves the :eek:.:p
 
split the cases and do it right or pick up a used engine for 100-400 bucks.
He could easily waste money on a used engine too unless he has the time to tear it down before buying it and the seller will let them do that. Compression may check out but the used engine could have other problems, bad tranny, crank bearings, any number of things.

I don't think anyone advised him to use a split chain, just mentioned it had been done on several occasions by people on the site. In fact, Ed recommended splitting the cases to do the job right.
 
i seen the way the conversation was going and wanted to voice my opinion.
i never mentioned Ed or anyone else.
there are plenty good/cheap engines around i'm sure.
84-86 700/83-750.
these engines was not known to eat there self up.
i had a trans back cut in an 83 750 once for a guy(jumps out of 2nd gear).
at that time i added 1150 cams/1100 jet kitted carbs.
and his bike had been beat from day one of its life and several different owners including myself twice.
if the poster of this thread bought an engine cheap enough.. he would have plenty of extra parts if it turned out to have something major wrong with it.
***this is just my opinion and we all know what those are like.***
 
You have several choices here. Take your chances on a used engine. Take your chances on a cam chain with a master link....something NO factory has done in MANY years & for a REASON!!! Third, & I think your WISEST choice, rebuild the engine yourself, or with the help of friends, & split the cases & install a solid chain the way SUZUKI says to do it! The end! Ray.
 
What's wrong with a rivet link cam chain? There are lots of peen tools available for cam chains.
 
Today's update:

Got the head off. Exhaust had to come off and 2nd cam out. The head looks in very good condition. No obvious bent valve nor any marks in any piston that might indicate contact. I'll try pouring acetone in the ports and watching the combustion chamber for weeping acetone. That's my normal yardstick for if the valves are sealing.

The chain doesn't look like it was a master linked chain. I found the one tiny piece of the link that has "pulled" open in this picture, but not the other side plate for the link. :(

I've decided I'll go ahead and split the cases and clean it out and replace the cam chain with an endless type. Partly because I also discovered quite a bit of 'chunking' on the front tensioner blade as well as noticed 'chunking' on the tensioner part that is on the inside of the valve cover. I didn't notice it earlier.

Maybe tomorrow I'll get the cylinder off and pistons off and all the 'external' bits - clutch, ignition, stator, etc. Father's Day though, so I'm not sure how much work I'll be doing on it.

Copyof001.jpg


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Copyof009-1.jpg
 
#2 looks like it was a little rich. Check the petcock and make sure you don't have fuel getting into the vacuum line from the petcock. You can just suck on the vacuum line while it's connected to the petcock and see if it holds vacuum. Hopefully you don't end up with fuel in your mouth. Could just be adjustment on that one carb but petcock leaks to #2 are fairly common.
 
Yep, and #2's plug was black too, while the other 3 plugs were a perfect light tan.

Interesting about the petcock, I'll have to check it out, because the PO DID have trouble with the petcock. It doesn't work properly and he had cobbled some kindof valve in the line. I haven't really investigated it, but noticed it when I took the tank off.

Kirk
 
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