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I think my idle is possessed by Satan.
Rebuilt the carbs again after installing a fresh set of intake boots, because one was cracked.
With fresh intake boots, and newly oiled pods, my idle is all over the place.
I could deal with a hanging idle - find the air leak or lean issue.
I could deal with a sagging idle - adjust for richness.
This idle is nutso.
Once the bike warms up, I can set the idle for about 1100 as normal. It will blip and return like it should. After awhile, the idle will do one of two things, neither with any regularity.
First, it will hang. Not a slow return hang. Instead, a blip to 2,000-2,500 will sit at that speed until I dial back the idle screw.
At other stops, it will sag and try to bog out. Blipping brings it back, but it will wind back down to <1,000 RPM unless I turn the screw in a bit. At the next stop, the idle will settle in at 2,000 because the screw is too far in, so I have dial it back out to level the idle.
Gets weirder. Sometimes, a blip will solve the idle in either direction. Blipping to salvage a sagging idle is obvious. During some stops, however, when the idle tries to stay at 2,500, a quick blip with rev it up and then drop it right back to a good idle.
I have gone over everything at least twice. The plugs are a mix of decent and rich. 1 and 4 were sooty, but 2 and 3 were right on the money (which I have never seen in a plug yet). When I idle it in the garage, there is a sporadic clunking noise from the muffler/exhaust. Not quite a back fire, more muffled and thunky.
The throttle cables are not snagged or catching. The throttle snaps back at all handlebar positions.
I tried some WD40 to see if the slides were catching somewhere, but the slides and throttle never feel stiff or sticky.
Fuel screws are about 3/4 - 7/8 turns out. The air screws are about 2 turns out, but highest idle is more impossible than usual, as I cannot get a stable idle >1,000 RPM, at least not one that I can trust not to bog out.
I have synched the carbs several times, thinking that a false positive on the synch I did yesterday was masking a problem. The No. 2 slide was a bit out of step, but after I adjusted it with the carb tune, the idle still misbehaves.
Another item, that may or may not relate to this. After riding for a while, I noticed the oil level seemed higher than I remembered. Paranoid about flooding carbs from before (all my testing shows that these are not flooding) I installed a new petcock today that I had set aside for my second tank.
So the round up is:
New intake boots, rings, etc.
Fully cleaned carbs, fresh o-rings, etc.
Valves are in spec (double checked them last week)
New petcock.
Float levels are at 23.5mm and a level check shows them settling about 1-2 mm below the bowl, right on the money.
Fuel screws 3/4 out
Pilot 15s
What the Hell??
Rebuilt the carbs again after installing a fresh set of intake boots, because one was cracked.
With fresh intake boots, and newly oiled pods, my idle is all over the place.
I could deal with a hanging idle - find the air leak or lean issue.
I could deal with a sagging idle - adjust for richness.
This idle is nutso.
Once the bike warms up, I can set the idle for about 1100 as normal. It will blip and return like it should. After awhile, the idle will do one of two things, neither with any regularity.
First, it will hang. Not a slow return hang. Instead, a blip to 2,000-2,500 will sit at that speed until I dial back the idle screw.
At other stops, it will sag and try to bog out. Blipping brings it back, but it will wind back down to <1,000 RPM unless I turn the screw in a bit. At the next stop, the idle will settle in at 2,000 because the screw is too far in, so I have dial it back out to level the idle.
Gets weirder. Sometimes, a blip will solve the idle in either direction. Blipping to salvage a sagging idle is obvious. During some stops, however, when the idle tries to stay at 2,500, a quick blip with rev it up and then drop it right back to a good idle.
I have gone over everything at least twice. The plugs are a mix of decent and rich. 1 and 4 were sooty, but 2 and 3 were right on the money (which I have never seen in a plug yet). When I idle it in the garage, there is a sporadic clunking noise from the muffler/exhaust. Not quite a back fire, more muffled and thunky.
The throttle cables are not snagged or catching. The throttle snaps back at all handlebar positions.
I tried some WD40 to see if the slides were catching somewhere, but the slides and throttle never feel stiff or sticky.
Fuel screws are about 3/4 - 7/8 turns out. The air screws are about 2 turns out, but highest idle is more impossible than usual, as I cannot get a stable idle >1,000 RPM, at least not one that I can trust not to bog out.
I have synched the carbs several times, thinking that a false positive on the synch I did yesterday was masking a problem. The No. 2 slide was a bit out of step, but after I adjusted it with the carb tune, the idle still misbehaves.
Another item, that may or may not relate to this. After riding for a while, I noticed the oil level seemed higher than I remembered. Paranoid about flooding carbs from before (all my testing shows that these are not flooding) I installed a new petcock today that I had set aside for my second tank.
So the round up is:
New intake boots, rings, etc.
Fully cleaned carbs, fresh o-rings, etc.
Valves are in spec (double checked them last week)
New petcock.
Float levels are at 23.5mm and a level check shows them settling about 1-2 mm below the bowl, right on the money.
Fuel screws 3/4 out
Pilot 15s
What the Hell??
Service Manual says 25mm or so. I've had them higher, but it ran lean as crap. When I checked the floats this time, 1 and 4 were a touch lower than 2 and 3, so that might explain the plugs. I leveled them all at 24mm, which is where 2 and 3 were set. 
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