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Gas Club Car Gas DS, and Precedent golf cars |
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01-16-2021, 11:35 PM | #1 |
Not Yet Wild
Join Date: Dec 2020
Location: Oklahoma
Posts: 21
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DS w/ a 420 predator. Clutch questions.
I'm working on a 90 DS for a friend. It already had a predator 420 swap done, but I don't think there was any clutch mods done. It only runs out at 14-15mph. Any suggestions on a good clutch set up? Engine runs out fine, but after half throttle there's no more speed.
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01-17-2021, 09:31 AM | #2 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,682
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Re: DS w/ a 420 predator. Clutch questions.
Putting a big motor in a golf cart alone will not increase speed. We need more information to determine if that’s correct or not. How the throttle is set up, condition of the belt, etc. if the engine is mounted a little too far backwards there won’t be enough tension when it’s running and it won’t pull the belt to the center of the driven clutch (losing speed). Put it in neutral and rev the engine. While it’s spinning fast the belt should rise to the top of the front clutch, and should drop all the way down to the center of the rear clutch.
You have to keep in mind. Stock golf carts with governor maxed will run around 18mph before hitting the rev limiter. A bigger engine will give more power to climb hills and sloppy mud, but it doesn’t spin any faster (RPM) than a stock motor so it’s not going to go any faster. Gear ratios increase speed. Cheapest is bigger tires but a gear kit 8:1 would be good on a 420 and add a lot of speed. |
01-17-2021, 11:36 AM | #3 | |
Not Yet Wild
Join Date: Dec 2020
Location: Oklahoma
Posts: 21
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Re: DS w/ a 420 predator. Clutch questions.
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01-17-2021, 01:34 PM | #4 |
Not Yet Wild
Join Date: Dec 2020
Location: Oklahoma
Posts: 21
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Re: DS w/ a 420 predator. Clutch questions.
The belt is not going all the way down in the secondary clutch. It's going a little over half way down the sheaves.
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01-17-2021, 07:32 PM | #5 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,682
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Re: DS w/ a 420 predator. Clutch questions.
There’s part of your problem. Do the sheaves look wavy on the driven clutch? It may be worn. That will improve performance and gain a few mph.
Is the cart lifted with larger tires, or stock? |
01-17-2021, 07:53 PM | #6 |
Bonafide Nincompoop
Join Date: Dec 2015
Location: Charlottesburg Va
Posts: 8,987
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Re: DS w/ a 420 predator. Clutch questions.
Do you have a picture of the clutches?
The belt will not go all the way down in the secondary. It will only go as low as the innermost diameter of the cones, so maybe 1-1/2 to 2”. A worn out or incorrect belt would cause it to not go even that far. The best way to spot a worn belt is if it sits down between the sheaves of the secondary clutch. The top of the belt should stick up above the outer edge of the clutch. If it’s below the edge of the clutch it’s worn and should probably be replaced. |
01-18-2021, 09:14 AM | #7 |
Not Yet Wild
Join Date: Dec 2020
Location: Oklahoma
Posts: 21
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Re: DS w/ a 420 predator. Clutch questions.
The cart is on 18" (stock size) tires. I couldn't see if the sheaves were wavy, I will get a better light in there and inspect that. I did find the stock belt measurements and the width is worn down about an 1/8"
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01-18-2021, 09:19 AM | #8 | |
Not Yet Wild
Join Date: Dec 2020
Location: Oklahoma
Posts: 21
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Re: DS w/ a 420 predator. Clutch questions.
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01-18-2021, 09:32 AM | #9 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,682
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Re: DS w/ a 420 predator. Clutch questions.
Correct that belt is worn. It’s also possible the clutches are worn.
The only “upgrades” really necessary are to the primary clutch if you want it to idle. Sometimes the stock clutch will close at too low of an rpm and it will creep at idle. But that’s about it, otherwise the stock clutches should be fine on a 420 And just to set expectations, I’d expect around 15-18mph with the 420 on stock tires and no other mods. It’ll get to that speed faster than a stock cart would but since it’s not spinning any faster than a stock motor the overall top speed remains the same. But the 420 will respond much better to lift and big tires than a stock cart would since it’s got plenty of power to make up the difference from the rotational mass and gearing changes that result from a larger tire. |
01-20-2021, 09:17 PM | #10 | |
Not Yet Wild
Join Date: Dec 2020
Location: Oklahoma
Posts: 21
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Re: DS w/ a 420 predator. Clutch questions.
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