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Old 01-29-2021, 09:51 PM   #1
Sgtbilko
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Default GX390 Club Car Want RPMs for More Speed

So I have a 1986 Club Car Carryall/DS, 22" tires, 2013 Real Honda stock GX390 from a DeWalt pressure washer, running nicely. Tops out at 17MPH. Has plenty torque. I want more RPM and on a budget so I can go faster than the electric naysayers. I have the 4-pin (rev-limited to 4000 rpm?) coil. What do I need to bump up RPM? Do I need to change flywheel and coil to get the RMP's? Once I can make the RPM's, I feel like I need to make it handle them without floating valves and such. So will the real Honda GX390 handle maybe 5,000 RPM with just some valve springs? If so, which ones? I can build an engine, but I lean on those that know the real Honda GX390 since I have never fooled with one.
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Old 01-29-2021, 11:52 PM   #2
raydhd
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Default Re: GX390 Club Car Want RPMs for More Speed

You could get the non limiting coil from NRracing for the revs BUT Honda or not I would change to a billet connecting rod. If the fails it usually destroys the entire engine. P.S. Some higher ratio rocker arms add some nice kick over 4500 rpms.
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Old 01-30-2021, 10:57 AM   #3
Sgtbilko
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Default Re: GX390 Club Car Want RPMs for More Speed

So the stock rod won't handle 5,000 RPM? Oh well; it won't be the end of the world if the motor fails; Duromax 18 is $320 on Amazon with the normal exhaust flange and 10-bolt crank cover, but then I'd be right back where I started. I'll definitely consider the billet rod, but MIGHT just take my chances without it.

What valve springs would ya run with a 5,000 RPM max, with and without the high-ratio rockers?

I have 2 brand new old-style coils that are single-wire, not rev limited, but the engine won't run right with them. I'm wondering if they have to be matched to the flywheel? I opened up the spark plug boot of the 4-pin coil and found there is a 10K resistor inside it but no resistor in the old style single-wire coil plug boot. Perhaps I should run a resistor plug with the old style coil?
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Old 01-30-2021, 11:38 AM   #4
raydhd
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Default Re: GX390 Club Car Want RPMs for More Speed

The flywheel you have is then UT2 type. To run the earlier coil you need a UT1 type flywheel. Vegascarts sells the comp cams HD springs many of us use.
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Old 01-31-2021, 10:57 AM   #5
Sgtbilko
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Default Re: GX390 Club Car Want RPMs for More Speed

Thanks. I'm gonna get me one.
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Old 01-31-2021, 11:31 AM   #6
raydhd
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Default Re: GX390 Club Car Want RPMs for More Speed

Vegascarts is selling the UT1 flywheel as a blowout item. $40 Shipped
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Old 02-03-2021, 11:16 AM   #7
Sgtbilko
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Default Re: GX390 Club Car Want RPMs for More Speed

Thanks; I just ordered it
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Old 02-03-2021, 03:26 PM   #8
raydhd
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Default Re: GX390 Club Car Want RPMs for More Speed

I think that is an easy solution
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Old 03-02-2021, 09:52 PM   #9
Sgtbilko
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Default Re: GX390 Club Car Want RPMs for More Speed

Quote:
Originally Posted by raydhd View Post
I think that is an easy solution
Haha...yeah it could be an easy solution, IF I could find my dang 22mm socket!

Bought the flywheel (thanks for heads-up on the VC sale) and I already had the old style coil. I refuse to buy the socket when I KNOW that sucker is hiding somewhere in my garage. No hurries though, since she doesn't break up 'til about 26 mph. Fast enough..for now
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Old 03-03-2021, 07:45 AM   #10
raydhd
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Default Re: GX390 Club Car Want RPMs for More Speed

You might find a 15/16 socket though not perfect will get the nut off.
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