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Unread 08-11-2019, 02:10 PM   #1
Gone Wild
Club Car
 
Join Date: Aug 2010
Location: Central Florida
Posts: 931
Default Performance Mods for Predator 420cc

Any suggestions for mods to do to my motor? I have a predator 420cc going to be removing it to clean it up, removing the club car starter generator and adding the Honda 18amp charging coil. Governor is still intact, may remove that when I put it back in the cart. It does 23mph right now with tons of torque. I have Jakes 6 lift with 23 tires.

This is what the motor currently has done to it:

Machined Driven Clutch
Power spring in driven clutch
200 rpm stall spring in drive clutch
HD drive belt
35 lb HD valve springs
Chromoly pushrods - shortened to 6.440"
8 degree timing offset key
Nr racing 1.3:1 roller tip rockers
Vegas carts tune able carb
Open element air filter
1-1/4" stainless wrapped exhaust
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Unread 08-11-2019, 03:03 PM   #2
VC 460 CLONE GONE WILD
 
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Yamaha
 
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 5,874
Default Re: Performance Mods for Predator 420cc

Cylinder head porting,valve unshrouding with an adjustable main jet in the carb will increase power across the entire rpm band.The valve pockets have a whole lot of material to remove.
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Unread 08-11-2019, 07:47 PM   #3
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Join Date: Jun 2011
Location: Kingston Springs Tn.
Posts: 166
Default Re: Performance Mods for Predator 420cc

Cam will help it more than any other mod ,free flowing exhaust ,k & n type air cleaner also remove the governor
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Unread 08-12-2019, 05:50 AM   #4
Gone Wild
Club Car
 
Join Date: Aug 2010
Location: Central Florida
Posts: 931
Default Re: Performance Mods for Predator 420cc

Been thinking about the 69mm stroker crank and the billet rod. Would have to turn down the piston .70-.100 any idea how much would need to be removed and get the compression ratio to around 10:1?
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Unread 08-12-2019, 07:10 AM   #5
Seaching for "The Way"
 
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Yamaha
 
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 6,425
Default Re: Performance Mods for Predator 420cc

Quote:
Originally Posted by KRAZYMATT View Post
Been thinking about the 69mm stroker crank and the billet rod. Would have to turn down the piston .70-.100 any idea how much would need to be removed and get the compression ratio to around 10:1?
Contact Vegas Carts, they can sell you the kit with the correct piston for your engine.
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Unread 08-12-2019, 07:44 AM   #6
VC 460 CLONE GONE WILD
 
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Yamaha
 
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 5,874
Default Re: Performance Mods for Predator 420cc

Vegascarts does not sell the 90 mm piston you need for the 420 cc engine. NRracing does have these and I see right now they have slightly flawed aftermarket 90 mm pistons for $5. They sell both the Vegascarts and ARC billet rods along with the 69mm crankshaft.
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Unread 08-12-2019, 01:14 PM   #7
Crazy Ole Man
 
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Join Date: Jan 2016
Location: Owego NY
Posts: 2,224
Default Re: Performance Mods for Predator 420cc

When you open up the cases to remove the governor gear it would be a prime time to shim the end play in the crankshaft. You can get shims from ARC and I set my end play .005-.007. Here's a list of helpful information

Originally Posted by skidmarx
Here is a chart for head milling from a company call Vegas carts here is there link :http://www.vegascarts
Stock = 41cc (8.75:1 CR)
Milled 0.025" = 37cc (9.5:1 CR)
Milled 0.050" = 33cc (10.2:1 CR) *Max for 87 Octane
Milled 0.075" = 30cc (10.8:1 CR) *Max for 91 Octane
Milled 0.100" = 27cc (11.5:1 CR)
Milled 0.125" = 24cc (12.3:1 CR)
Milled 0.150" = 21cc (13.3:1 CR) *Maximum Recommended

Pilot Jets
Stock Air Filter with Std Bore Carb, Gas, .018
Open Element Air Filter on Std Bore Carb, Gas .020
Bored Carbs, Gas, .022
390 Carbs, gas, .024
Methanol Carbs, .029
Main Jets
FYI: Stock jets on GX200s are .028.
FYI: Stock jets on GX390s are .036-.038.
Use a larger opening jet if you're running lean and a smaller one if you're running rich. This is a list of stock number sizes and opening diameter.

Options
SKU
Size
Number
RLV5010
.032
#81
RLV5011
.034
#86
RLV5008
.035
#88
RLV5012
.036
#91
RLV5009
.037
#93
RLV5013
.038
#96
RLV5014
.039
#99
RLV5015
.040
#101
RLV5016
.041
#104
RLV5017
.042
#107
RLV5018
.043
#109
RLV5019
.044
#112
RLV5020
.045
#114
RLV5021
.046
#117
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Unread 08-13-2019, 02:35 PM   #8
Gone Wild
 
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Join Date: Jun 2011
Location: Kingston Springs Tn.
Posts: 166
Default Re: Performance Mods for Predator 420cc

With any u need a billet rod for sure
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