adventurco said:Butterflies and throttle operation are normal. Ensured that throttle pull cable was not opening the throttle plates at all when installed (if cable was too short).
hillsy said:Do the butterflies close fully? You'll be amazed at how little they need to be open at idle.
crazypj said:In the pics, the cables are not connected to carb?
crazypj said:You don't need to remove throttle plates to check angle on the edge, just open throttle and take a look. I know the repaired one has pretty rounded off edges from being fitted 'backwards' then pried open or something which bent it 'Z' shaped.
I flatted it out, polished it a bit to remove worst of gouges then fitted it correct way around.
The more you learn about mechanical/electrical/fuel side of engines, etc, the more you'll wonder how they ever got invented (plus how they ever stay in one piece - at least most of the time ;D )
jpmobius said:here here! Most of the time, throttle plates aren't an issue simply because most of the time people don't disturb them. Sometimes really abused ones seem to be fine, but it depends heavily on exactly where the damage is. They have to fit close so the high speed airstream directly over the pilot system is what it needs to be. If that part is intact, and some other part simply passes a bunch more air, it is easy to see where there will not be sufficient airspeed over the pilot because of the leakage elsewhere. You might be able too compensate by going with much larger pilot fuel jet, but as soon as you crack the plates open, you would have another problem to deal with because you will have "normal" air but way too much fuel. On the other hand, if the perimeter is fine and the area over the pilot is wide, you will never get enough airspeed over it to work rightly. It is a tiny thing, but from what you say, your engine is fine except for idle - also known as nearly closed throttle where very tiny details are all that count.
crazypj said:Nope, not exhaust. It's more likely water vapor 'boiling' out of the oil. It's 'good' -try sticking your hand in the vapor and sniffing it, shouldn't smell too much of oil, you may even get water condensing on your hand?
It's the reason why engines need to be run until over 212f and short trips are so bad as 'blowby' condensation gets into oil/crankcase (all internal combustion engines do it)
crazypj said:I've only ever had one worse set of carbs, they were the only ones I couldn't fix and owner had to eBay for 'new' ones ( around 20 hrs on them so far )