• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

GS1100 engine trouble

  • Thread starter Thread starter markqvist
  • Start date Start date
If there is that much oily crap there, then the muffler packing is probably soaked with it as well. Do a wet and dry compression test to see if its the rings or the valve seals. Put some easy good miles on it first, warming the engine thoroughly, it might be that oily mess burning off. Also, revving an engine in neutral is bad IMO.
 
A belated welcome, Mark. I joined this forum a little over a year ago and the folks on here have been incredible; friendly, knowledgable and they know these bikes inside out. If it wasn't for the great people on this forum, I'd have given up on my gorgeous old GS750 more than a few times. You're in very good hands.
baz
 
Thanks for the welcome BassCliff and baz666! :) I'm really happy i found this wonderful place. All you guys are great. So helpful and knowledgable!

So, during the last days, the bike has underwent a major teardown. Here's the verdict: (it's not good, lol)

Compression tests showed an extreme lack of compression on all cylinders, number three had close to no compression, as later discovered due to a valve being stuck open.

The clearance between pistons and cylinder walls is about 0,25 millimeters on all cylinders. Yikes! Cylinder walls and pistons are worn to the extent of it being ridiculous. Compression- and oil rings are almost gone.

One of the valve seats (i think this is what it's called in english) was actually loose in the combustion chamber.

One of the valves were stuck open. I don't know if this is from misadjustment, or if it has simply got burned stuck. There was huge amounts of oil in all cylinders when it was taken apart. Also burnt gunk on all the valves.

A couple of bolts were broken and a couple were missing from the guts of the cylinder head.

Several exhaust manifold gaskets were bad, one completely #"%?.

Exhaust is naturally full of crap, oil and fuel.

So, that was the big scary verdict. Now to the good stuff, that will hopefully see this wonderful bike on the road again soon:

The cylinders are getting rebored as I'm writing this. A brand new, original piston kit and connecting rods have been obtained from Suzuki. Yay!

All the gaskets are being replaced. The top end is getting all the bad valves, seals and seats replaced with new ones. And the broken bolts will be fixed of course ;)

Apart from that, it'll all be cleaned as good as possible, and then to top it off have the oil and filter changed of course. I've been told that I should put mineral based oil in it for now especially, would you guys recommend this as well?

So all in all, it's practically getting a brand new engine ;) So yeah, there goes the savings, but hopefully after this it'll be ready for the next 100.000 kilometers, I'm counting on having this bike for a looooong time. I'm still a bit nervous that something else will be wrong that I haven't discovered, but fingers crossed that I'll be on the road again soon!

Thanks for all your help guys! I wouldn't have gotten this far without your advice and encouragement!
 
Just a note for when you get it back.... In post #6, I think TKent was referring to the compression showing a low reading, not the oil level in the window reading low. With the bike on the centerstand (or held level if you don't have a centerstand) the oil level should read correctly in the site glass. It seemed in post #8 you might have misunderstood.
 
You must log in or register to reply here.
Back
Top