VFJ 750cc std bore testing - Kawasaki ATV Forum
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post #1 of 135 Old 07-02-2012, 06:34 AM Thread Starter
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Talking VFJ 750cc std bore testing

Got the std bore setup installed last week and did some testing. I was happy it was the highest HP std bore kit I've done to date. Just a bolt in kit, pistons, custom grind cams, valve springs, PCV, Muzzy duals. stage 3 spidermod clutch, Stock heads no porting or decking, stock cylinders, no decking or surfacing, stock valves, stock throttlebody.

~65.6 average RWHP. and it holds the HP line above 60 rwhp all the way to 60 mph.

while this is great. I feel like I can get even more RWHP out of this setup. Before we add ported heads, 38mm throttlebody. I feel that would get us over 70 rwhp right now. but I don't want to have the added expense and time down for porting and bored t/b as I believe the power is there without it. well see....

also, the torque is up more than the other kits I've tested as I do not require insane RPM's to make the power. We are only shifting out at 7600 rpm making this power to the wheels.

There is NO dead spots in the lower rpm range, common with some other setups, there is ZERO lag hitting the gas. it takes off like a ROCKET and literally hits 50 mph in about 4 seconds.


So....it's going back to testing with some additional cam profiles and possibly a zero gap secondary ring package instead of the zero gap top ring package.

While this setup may have made the best RWHP to date of any bolt in std bore setup that I've tested, it didn't make close enough to the 70 rwhp with a bolt in setup like I wanted it to.

ALSO. we did not drill and tap ANY additional venting for the crank case and running the vent hose to the airbox like stock. NOT A DROP OF OIL IN THE AIRBOX!!

I'll post up the charts later I have to get them off the dyno computer and I have 4 clutches to finish to go out today.

just a heads up, the std bore kits are working, but not 100% finished to my liking yet.

John

WEB: WWW.VFORCEJOHN.COM
PHONE: 570-773-1240
EMAIL: [email protected]

DISCOUNT MUZZY EXHAUSTS click here https://www.kawieriders.com/forum/int...ml#post1328320

Last edited by VFORCEJOHN; 07-02-2012 at 12:50 PM.
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post #2 of 135 Old 07-02-2012, 06:47 AM
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wow thats awesome. cant wait til you get it finished to your liking haha.

2009 Lime Green Brute Force 750i
Hmf Slip On Exhaust
Dyntek Ignition Dyntek Coils
Rox Speed Power Madd Hand Guards
'25 Terra Crosses
'12 Nolimit Octane wheels
Std bore kit , Hotcams
wiesco pistons 11.5 : 1
vfj
#6 pri and #4 secondary

2007 King Quad 700
ProCircuit Slip on Exhaust
Cobra Fi Fuel Programmer
26' mudlites Itp wheels

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post #3 of 135 Old 07-02-2012, 07:37 AM
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Man I would think with head work and throttlebodys you would in the 75ish range

PART OUT06 kfx730 Big Kevs Performance 730pistons AMRXX cams 37mm carbs.
Ported heads by R&R Performance
muzzy super pro, VFJ stage 3 spider, elka shocks


304 784-RIDE (7433)
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post #4 of 135 Old 07-02-2012, 12:52 PM Thread Starter
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we'll see, I want to max it out as far as possible while keeping ultimate reliability, no race gas, no crazy compression.

with the cams I am using there is no low end crapping out (where it spits and blubbers until 10 mph) so common with large duration cams. these are .420 lift and near 270 duration setup too!!

this was all done on pump gas sunoco 93 octane.

I'm sure with race gas and me adding some timing it may pick up 1-2 possible HP. but that's not how I'm going to do it.

John

WEB: WWW.VFORCEJOHN.COM
PHONE: 570-773-1240
EMAIL: [email protected]

DISCOUNT MUZZY EXHAUSTS click here https://www.kawieriders.com/forum/int...ml#post1328320
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post #5 of 135 Old 07-02-2012, 07:28 PM
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I think the next test session everything is gonna come together.But you just never know. Thats what many hours of assembling and testing and disassembling and making changes is all about .Many late nights after my normal job.

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post #6 of 135 Old 07-02-2012, 08:40 PM
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sweet john i can't wait to see the finish product although now you're making me want to get a brute now










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post #7 of 135 Old 07-03-2012, 04:50 PM
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This sounds like the kit I need for my brute!! Ill be watching for when you get it finished.
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post #8 of 135 Old 07-03-2012, 08:25 PM
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i'll be waiting to hear the price of the kit, maybe i'll be the first up in canada to have one???
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post #9 of 135 Old 07-04-2012, 02:10 AM
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Looks like another thing I'll have to order from you, list keeps getting bigger haha, dual muzzy, PCV, clutch work and now bbk. Keep the good stuff coming John!
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post #10 of 135 Old 07-04-2012, 04:07 AM
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Great, i'm waiting for the final result and price !

2011 Brute 750
MSD tuned by VFJ, Muzzy Pro Full System
RDC Lift 2", Snorkeled, winch 3500lbs,xvision led
Zilla 26", Dwt diablo 12", Overfenders, Twin air filter
Teryx Belt, Epi maroon primary, almond secondery springs,
front bumper, temp gauge, handguards, contour HD 1080p
Fasstco Flexx bar,P
roTraper bar mount, Oil cooler, Airscreen removed etc.

Check out my video channel!
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