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11-29-2020, 01:38 PM | #1 |
Getting Wild
Join Date: Nov 2020
Location: Edgewater. FL
Posts: 113
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What speed @ what rpm?
I just did my first run with tach and gps speedometer. I am very surprised and not sure if my get is working well.
1500 rpm=3mph 3000 rpm=10mph 3900rpm =13mph 3950 is max of my setup and I expected faster ground speeds. It is a completely stock cart, guess it's time to upgrade it for more speed, I'd like to see 17-20mph. How do these numbers compare to others carts? |
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11-29-2020, 01:50 PM | #2 |
Nincompoop Club Member
Join Date: Jun 2016
Location: Idaho
Posts: 1,178
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Re: What speed @ what rpm?
I don't know what buggy you have but 3900rpm for 13 mph sounds about right for a 2cycle being stock and governed
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11-29-2020, 01:57 PM | #3 | |
Getting Wild
Join Date: Nov 2020
Location: Edgewater. FL
Posts: 113
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Re: What speed @ what rpm?
Quote:
Governor screw all the way in..... I just thought it was kinda slow for this cart. Thanks. UPDATE: I used this site to calculate gear ratio of 16.277... sounds like clutches are not doing their job... http://www.advanced-ev.com/Calculato...Size/?rpm=3950 |
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11-29-2020, 02:11 PM | #4 |
Nincompoop Club Member
Join Date: Jun 2016
Location: Idaho
Posts: 1,178
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Re: What speed @ what rpm?
I used to have an 82 G1 that was way slow like that, I bypassed the Gov by simply re-routing the throttle cable directly to the carb. Top speed was 18ish and a lot more responsive throughout the power band....
One thing you don't want to do is forcefully move the Gov lever on the differential, I've heard horror stories of breaking a plastic gear in there. EDIT; Ooops you must have edited your post, or I didn't notice yours is a 4cycle. I don't know much about those |
11-29-2020, 03:16 PM | #5 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,441
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Re: What speed @ what rpm?
It sounds right for the golf course lol. I'm betting the gov is set way low. Clutches and belt could be worn too, thats always a factor.
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11-29-2020, 03:35 PM | #6 |
VC 460 CLONE GONE WILD
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 10,644
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Re: What speed @ what rpm?
Have you put it on jack stands and checked the clutches. My G 14 when stock that has the same gearing would do in the 23 mph range @ 4500 rpms. Again I had the gov tie wrapped so it did not cut in.
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11-29-2020, 03:39 PM | #7 | |
Getting Wild
Join Date: Nov 2020
Location: Edgewater. FL
Posts: 113
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Re: What speed @ what rpm?
Quote:
I just did the governor mode where the spring is placed on top of the bracket with carb cable, seemed to lower rpm to 3800 on a short ride. Also the rear clutch is hot to the touch, differential is cool, and drive clutch only closes enough to bring belt within 5/8 of the top. Should it ride all the way to the top edge? What causes it to stop short of the top? |
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11-29-2020, 04:17 PM | #8 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: What speed @ what rpm?
Sounds like a badly worn belt, or the wrong belt. The bare minimum belt you should buy is a yamaha oem belt, cheap belts are a total waste of money . Your correct yamaha belt part number would be J55-G6241
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11-29-2020, 04:51 PM | #9 |
Getting Wild
Join Date: Nov 2020
Location: Edgewater. FL
Posts: 113
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Re: What speed @ what rpm?
Thanks cgtech for the info, I took a photo of existing belt and it matches your reply. This is the belt on it..
Last edited by Jammy; 11-29-2020 at 04:55 PM.. Reason: Word of appreciation!!!!! |
11-29-2020, 05:04 PM | #10 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: What speed @ what rpm?
That belt looks good, but the aftermarket spring may me too stiff for the clutch to fully shift.
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