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Is it worth it to remove the head?

Uh, have a look here. I can't remember the full explanation off the top of my head, or I'd just tell you. Something like insufficient fuel in the mix at low RPM to keep the chamber cool enough to prevent detonation.
 
Graham said:
My GS1100GL had a little tick when I got it that would come and go. I thought it was valve but the valves check out fine. Maybe piston-slap and sure enough I had scared pistons and a cracked cylinder. After the top end I still had the ticking so I check the clutch. Sure enough only one broke spring left in the back of the clutch. After the new clutch basket the ticking was still there. What the hell I pulled the stator. Sure enough it was burnt up and a tooth was missing off the starter clutch gear. After replacing the stator and the gear the tick still remained. So after rechecking all my work so far it was time to check the crank. Sure enough number 2 rod was a little sloppy and just to make it complete the secondary gears were knurled up. New crank and gears and my tick is gone. After $1300 and over 100hours work the tick was gone. The whole time the run great and only had what sounded like a slight valve tick that came and went. I also discovered that all the valves had grooved valve faces and a stripped-out drain plug.

Yea it?s worth pulling the head for starters.
Click to expand...

Looks like to me the more you dug, the more you found, hopefully you're able to quit digging and do some riding.
 
An update on mine: After a top end rebuild, this is almost completely gone. I can only induce the noise when the engine is warm, at about 2500 rpm, by whacking the throttle open farther than makes any sense (not much torque to be had down there).

I had new valve seats cut (valves ground to match, of course) and installed new rings with fresh-honed bores. No change to the carbs or ignition timing. I don't have any theories on how rings or valve seats could have been the cause of this noise. What did surprise me was the amount of carbon still present in the chambers after my steam cleaning experiment. In particular, the buildup on the valves faces was like glazed bathroom tile in hardness. Most of it chipped off with the blade of a screwdriver. I don't know if this stuff really can hold enough heat to cause pre-ignition, but it's my leading theory.
 
Hi Guys

I've got almost identical problem on mine LOL and I'm 99% convinced its due to a lean circuit in 1 of the carbs.

To me it sounds like it's no2 cylinder doing it.

I'm starting by replacing the carb to head boots (No Air Leaks to lean out mixture) and looking at a propper exhaust system as mine are butchered absolute free flows.

Once the above is sorted, I'll play with the carbs mixtures/settings and see. I'm guessing, but almost sure no2 and 3 cylinders will need to be set a tad richer to compensate for the extra heat. this also won't cause any damage I think, so rather safe then sorry.

Good luck and hope you sort Ur hassles out.

Zane
 
By coincidence, the bike DDaniels is talking about in this thread is the bike I'm currently selling -- if anyone wanted more detail about the racket I mentioned in the For Sale ad.
 
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