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I have a Duromax 440 with that exact cover. No starter problem. The Duromax uses lots of the same parts as the 390. It's a clone like the Predator 420. I got rid of the counter balancer. I can't really tell the difference. I assume being you are looking at a billet side cover you have...

LOL OtherBob, I was about to pull the trigger on a 38MM Flat Slide carb. To my dumass pulling up the choke lever to choke and down to run just made sense. Once I looked at a schematic of my particular unit I saw I was wrong. BTW, I have been wrenching on stuff since around 1964. I was a...

What is your weight? If you want stout go to a 780 system.

Just an FYI. I have a 6 seater golf cart with a 440 Duromax engine. It's modified. The gear ratio is very low on this heavy cart. I use a 780 series Comet driver. At about 5K rpm it is doing 22-23 mph. I hauled 6 people around the other day, I figure at least 1,000 lbs of human beings...

LMAO! Figured it out. It was the choke. I looked in many places. Choke lever up to choke, choke lever down to run. That is true to the enrichers with a knob. My carb has a lever. Lever up enricher is off. Lever down enricher is on. Runs great now. Spark plug looks okay.

Engines seems to be happy with the smaller jets. I don’t use sprockets.

I don’t have a flange carb.

Thanks. Mine is boot. I’m an old man. 72. Back in the day as a young man I can remember listening to those inline 6 cylinder cars driving around and you could hear the carb sucking air! I drove a ‘64 Chevy pickup with a 292 6 and 4 speed. The carb on those were small. You could hear the carb...

Makes sense. It runs pretty good now. Lots leaner. I’ll try and drive it around a bit and check the plug. So, in the event I do go to a bigger Mikuni 36 mm or 38mm I have questions. First is, I am assuming I can’t use my current manifold. Or can I just blend it to a new larger carb? And second...

So if I understand you I’m not getting enough air? I got too much fuel. So a 38 mm with smallish jets.

So you suggest what? A 36mm? I understand the single cylinder vacuum stuff going on with these engines. I have higher than stock compression with a 40mm intake valve with a small intake port for low end power. I did machine the port at the intake manifold to match up.

So I lowered the float from the high setting of 22 mm to 24 mm. Put in a 17.5 idle jet. Dropped from a 190 main to 180. Haven’t been able to drive it cause it’s raining. But I can tell, and smell!, it’s running better. Great throttle response, idles better. I’ll run it at higher rpm today and...

Well, it runs pretty good. Idles okay, but rich. I have the AF at about 2 turns. Throttle response is good. If you just let it idle for a minute or so and mash down the go petal it hesitates. But if you rev it a couple times then put it in gear and hit the throttle away it goes. I may try...

Still running way too rich.

Hey, give some details on the drive. That looks awesome.

So I re-jetted the carb. I put a 20 jet in the idle circuit and a 190 main jet in it. I moved the clip on the needle up one notch. Put in a new Autolite plug. It fired right up. I adjusted the air screw and idle till my ear thought it sounded right. It sounds good. I need to get it out and run...

I intend to move it up one notch.

Like the key is shut off for 10 milliseconds. No pop, I'm sure it looses power for 10 milliseconds, but you can't feel it. A very brief stumble.

Idles pretty smooth with the 15 jet. I'll try a couple larger jets once I get them. Going from a standstill to rapid full throttle application seems very smooth. Cruise is 1/2 throttle or less. This Golf Cart has a 17-1 axle ratio so it's geared really low. Cruise is like 15 MPH. I need...

After it warms up good and cruising at around a steady 4k rpm it acts like a misfire. No pop.