this might be the GS with the most money put into it of all time..
I don't even know whats wrong, but it made a clunky slapping sound going down the highway and just died. :technical: HOW?! AND WHY ME!?
just pulled the head. I feel like I've been here before... :cookoo: looks like maybe the timing has come undone because of a bad tensioner... gonna need a new one... what are the chances that timing comes undone and doesn't destroy anything?
Are you positive that's the issue, or just a guess at this point?
Quote from: Iarn on May 24, 2015, 01:22:19 PM
Are you positive that's the issue, or just a guess at this point?
well when I cracked it open the timing chains paint had some spots missing on about 8 or so links that weren't there before [assuming it was loose and smacking against something] also when you turned the engine over by hand the exhaust valves and intake valves were opening at the exact same time on one side. also the chain was stupid loose, about and inch and a half of play.
I assume what happened was the chain was so lose it slipped over one of the 3 gears it rides on. causing a timing misalignment.
but that's not the only issue, looking at the bike from the direction you ride it, the top left exhaust valve bucket makes a terrible noise.. but when I have all valves shut and shove a flash light into the spark plug holes I can't see any light coming from around the valve seats. the goodish, but the weird clanking noise that valve makes worries me. valve stem, or worse valve guide has been bent or broken.
also the chain tensioner doesn't spring back any more like its suppose to. you can turn it with a screw driver any direction and it just stays put.
im just playing a guessing game here, I won't know until more digging into the engine.
something went a strange. I'm just hoping it didn't cause too much damage.
I'm by no means an expert, but I've been inside this engine enough times to take some decent guesses. the engine turns pretty freely nothing is getting stuck or stopping so maybe there's hope after all.
LETS PLAY A GAME.
http://i.imgur.com/aG3DHUh.jpg
Lets call it. "Yo' cams went full retard"
Yea that doesnt sound good at all. Cant tell much from the picture though. If the cams did slip, valve/piston damage is very likely. I once buried the valves in a 91 Cabriolet 1.8 single cam, we mistakenly timed it 90 degrees off and tried to start it. Made noise for a few seconds, then kept turning over like nothing was wrong. Took us awhile to realize what we had done, and once the head came off it was clear, bent half of them I think.
I personally wouldnt turn it over any more, but the damage is probalby done. If you want to know for sure before pulling the head off, just pull a plug and spin the motor with a thumb over the plug hole. If you dont feel pressure you know whats gone wrong. Good luck