08-11-2019, 02:10 PM | #1 |
Gone Wild
Join Date: Aug 2010
Location: Central Florida
Posts: 1,506
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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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08-11-2019, 03:03 PM | #2 |
VC 460 CLONE GONE WILD
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 10,644
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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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08-11-2019, 07:47 PM | #3 |
Gone Wild
Join Date: Jun 2011
Location: Kingston Springs Tn.
Posts: 874
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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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08-12-2019, 05:50 AM | #4 |
Gone Wild
Join Date: Aug 2010
Location: Central Florida
Posts: 1,506
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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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08-12-2019, 07:10 AM | #5 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,441
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Re: Performance Mods for Predator 420cc
Contact Vegas Carts, they can sell you the kit with the correct piston for your engine.
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08-12-2019, 07:44 AM | #6 |
VC 460 CLONE GONE WILD
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 10,644
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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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08-12-2019, 01:14 PM | #7 |
Crazy Ole Man
Join Date: Jan 2016
Location: Owego NY
Posts: 2,758
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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 |
08-13-2019, 02:35 PM | #8 |
Gone Wild
Join Date: Jun 2011
Location: Kingston Springs Tn.
Posts: 874
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Re: Performance Mods for Predator 420cc
With any u need a billet rod for sure
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