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ProLibertate ProLibertate is offline
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Default '66 XLCH Running Pig Rich

I've recently completed a VM38-9 conversion, and I'm having a terrible time with my plugs becoming black as the night within just a few minutes at idle. I'm running the VM38-9 with factory settings, but I'm curious...

My '66 XLCH came with a folder that includes instructions for installing various aftermarket components (Barnett clutch, KB pistons, and an Andrews cam). I can only assume these have been installed on the bike, though there's really no way of knowing without tearing into the engine. Assuming a hotter cam was installed, how might this affect the pilot circuit? The Sudco kit came with two size up and two size down pilot/main jets, though I seriously doubt going down two sizes (from 30 to 25) is going to resolve things, considering how rich it appears to be running.

Last edited by ProLibertate; 1 Week Ago at 03:57..
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First thing is to make sure you understand that the mixture screw controls air instead of fuel. Turning the screw in reduces air and makes it richer, and out is leaner. How many turns out are you on the mix screw? The #30 jet should be perfect, regardless of cam choice.
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Thanks for chiming in, doodah man. I'm currently running it at 2.5 turns out. It's my understanding that three is the absolute max. Perhaps I need to go back to checking timing/advance?
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Your choke is on
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I wish it were something that simple, kitabel. I always shut off the enrichener immediately after the bike starts. I tried installing the "25" pilot jet just for giggles, and I couldn't get the bike to run without the enrichener on. In going back to the "30", it'll run with the enrichener off, but it smells highly rich-- a check of the plugs confirms this, as they're both black and sooty.

I'm running 85 Autolites with a .020" gap, new Taylor wires, and just installed a new magneto cover. Could using high-octane gas be the culprit? 91 octane is the only stuff they sell here that's ethanol free. Beyond double-checking timing, points gap, and valve lash, I don't know what else to do.
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Timing set on adv mark?
What ex?
Which direction are you working the enrichment lever? Which way is “run”?
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Are there any other symptoms than just "black" plugs ?

I haven't used Mikuni's on anything for years but basic principles are the same for all carbs.

No accelerator pump, so the engine should go lean if you snap the throttle open. People often try to eliminate this "bog" condition but it is normal to have it. Often they attempt to run a bigger idle jet and smaller cutout than what is really required.

Fuels today have so many additives I haven't bothered doing plug checks for many years. Seriously. They are extremely hard to do correctly and only an approximation.

The spark plugs will have a self cleaning effect but that only happens when the engine is fully up to operating tempera rue and running on the main jet.
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Have you dismantled the choke plunger? It may not seat all the way.
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Quote:
Originally Posted by Iron Mike View Post
Timing set on adv mark?
What ex?
Which direction are you working the enrichment lever? Which way is “run”?
I'll double check timing tomorrow, Mike. It was supposedly a recent rebuild and advertised as "turn key", but I'm finding this to be far from the truth.

Bike still has what I believe is the original exhaust. I pressed the enrichener lever down, effectively pulling its associated plunger up. When the bike is running, I bring the lever up.
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Quote:
Originally Posted by kitabel View Post
Have you dismantled the choke plunger? It may not seat all the way.
I haven't. It's a brand new carb from a Sudco kit, so I have no reason to believe the carb or any of its components are at fault.
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