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Carb sync question

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McCabe-Thiele (Ted):
Were the casing dowels both in place?

DomP:

--- Quote from: McCabe-Thiele (Ted) on July 21, 2024, 08:23:31 PM ---Were the casing dowels both in place?

--- End quote ---

Yeah both there Ted, I can't work out what wound cause it.  Initially I was worried it was engine internals noise but it was definitely from this side so I've had a look at the oil which initially looks as good as new still, might be an idea to drop the oil in any case to check for regurgitated engine parts?

Edit*  I know what it is now, the three screws holding the coil on have all worked loose.  I must have not done them up tight enough or used any threadlock on them, hopefully not too much damage caused!

Bryanj:
The steel should have protected the windings.
WARNING
DO NOT run the engine with that casing off or you will get a fully lubricated floor and loose to the farthest dirty area a nla plug

DomP:

--- Quote from: Bryanj on July 21, 2024, 10:51:00 PM ---The steel should have protected the windings.
WARNING
DO NOT run the engine with that casing off or you will get a fully lubricated floor and loose to the farthest dirty area a nla plug

--- End quote ---

🤣  I've read you mention that before Bryan, I'll make sure I don't.  Presumably this will be the reason it sounded awful and lost power.

K2-K6:

--- Quote from: McCabe-Thiele (Ted) on July 21, 2024, 12:33:42 PM ---
--- Quote from: DomP on July 21, 2024, 12:17:42 PM ---All back on and set to 1.5 turns out, no more hanging idle but smells very rich.  Could it just be that I need to get out on it and get some miles on it now?

--- End quote ---

Aside from it smelling rich are there other signs such as an overly cold exhaust - I assume you have tried opening up the air screws a tad.

I found a decent run often helps as you get the whole system up to temperature plus when riding you will burn up the fuel through the rev range moving onto the main needle jets.

--- End quote ---

Agree with this.

Would go further in this direction to evaluate what range you're actually operating in. Turn the airscrews out to 2 3/4 for a functionality check in establishing IF there's enough range of adjustment to correct what exists currently.

If they get to 3 turns out, and without correcting mixture adequately, likey that the idle jets themselves are flowing too much fuel. This is effectively what an "engine check light" on fuel injection is doing, telling you it's reached the maximum allowed in programmed adjustment but not successful in fully corrected output.

MOST of these carburettor would have the adjustment range of screw within 1 ~ 3 turns out, past those positions would indicate the fuel jet is too large or too small for application.  That could be partly blocked, enlarged through cleaning, or the wrong size simply installed.

Going for maximum outwards is not to run it like that but to answer the question of IF it can be corrected within design parameters.  Try it to find out. It could be that one size smaller jet is suitable in this case.

Before this though, are you confident of the air filter fitted ? That could also significantly skew results here.

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