New kid needing clutch, jetting, mod info

2533 Views 21 Replies 9 Participants Last post by hkunz, Feb 25, 2010

2stroke4life

Discussion Starter · Feb 21, 2010

Hi, I am Sheldon Ewing. My brother bought a 2006 KFX 700 last year and we rode the piss out of it. We both love the thing. Much faster than my Sportsman 500 all modded out that I wrecked.

After spending a season on it my broski is ready for some more power. We ride trails, hills, and mud.

Things done:
2500lb winch
rear rack
Moose Racing throttle
Fresh fluids and amsoil everywhere it could go

Things I am doing:
polished slides
white polaris spring
12 hole mod
CR7EIX plugs
Non resistance plug wires
2002 prarie stacks
Going to add 25 inch rear mud lites for clearance

Questions:
Is the advancing key worth it?
what jetting should I be looking at for the stuff listed above? (starting point)
Air filter recomendations?

Thanks for any help. Hope to get my own soon or the KFX 400 because I am partial to standars unless the spring really wakes this thing up.

1 - 20 of 22 Posts

Kenny4

· #2 · Feb 22, 2010

Hey 4stroke

---Welcome to KR---Most of the guys on here will recommend the Twin Air Power Flow Kit---It's $89 at Rocky Mountain ATV----Jetting from 178-185---Start with 180 front and 182 rear---You can do a little seat tuning by putting tape over some holes in the lid and go back and forth.

Kenny

HEATHEN 730

· #3 · Feb 22, 2010

Welcome to KR!

The Speed Force

· #4 · Feb 22, 2010

Get your clutch machined, make that one of your first mods.

Contact VForcejohn on this forum. "Interstate Motorsports"

Kenny4

· #5 · Feb 22, 2010

The Speed Force said:
Get your clutch machined, make that one of your first mods.

Contact VForcejohn on this forum. "Interstate Motorsports"

A lot of the threads say cutting the primary only helps for top speed is that correct or does it help all through the power band---Thanks

Kenny

2stroke4life

Discussion Starter · #6 · Feb 22, 2010

Thanks eveyone. I am getting alot of stuff from John already. Anyone know how much it costs to get the clutch machined?

Trying too keep costs to a minumim for now till some other things are all paid for.

wapiti1

· #7 · Feb 22, 2010

If I was in your position, I would spend my $$ on Exhaust-12 hole-twin air filter- and UPP or equivelant ms mod intakes And of course jetting for this. These 4 things will be your best power to $$ ratio that you can do to a stock internal V. You will really notice the power increase with these add on's.
When you get this done then I would consider a clutch.

Just my 2cents.

Toyotadude

· #8 · Feb 22, 2010

2stroke4life said:
Anyone know how much it costs to get the clutch machined?

I think Stage 3 machining is $200 (includes return shipping)

04 KFX785, FST Stage3 cams, HMF Duals, Dynatek CDI, 210 mains, #42 pilots, James'(05-BF-750) cross-overs, 12 hole mod, polished slides, Twin air filter, 1 shim on needles, VFJ's stage3 clutch, American Star Racing 2" extended A-arms, Firestick adjustable rear axle, Honda 400EX throttle, Venforcer 4" swingarm extension and billet dipstick, brake reservoir cover and throttle cover, Jordan's(KFX Hellraiser) shorty shifter, Elka shocks, Denton steering stabilizer, 22-7-10 Sand Stars in front, 26-12-12 9 paddle Extremes in Rear, HID conversion, Trailtech bars and clamp, AC Nerfs, Bumper & Six pack rack, thecarboncartel tank guard & stator cover

04 KFX700, Lava Red plastics, Yoshimura duals, AC Nerfs, 24-11-10 8 paddle Extremes, HID conversion (coming soon)

86 Toyota 4X4, 4.3L Chevy V-6, 700R-4 trans, Marlin Crawler dual transfer case, limited-slip front diff, ARB rear diff, custom flatbed w/aluminum diamond plate insert, Super Swampers for trails & Desert Trac paddles for sand

2stroke4life

Discussion Starter · #9 · Feb 22, 2010

Thanks again. I was wondering what stock Pilots and main jets are? I am really good at jetting just new to this car.

Kenny4

· #10 · Feb 22, 2010

2stroke4life said:
Thanks again. I was wondering what stock Pilots and main jets are? I am really good at jetting just new to this -----CAR??????

What they are or where they are----Think you mean where-----They are on the right side of your carbs, (as you sit on the bike), they are inside the float bowl area---Each float cover has 4 philips screws, (which are very soft)---Inside mains are to the right and pilots to the left in each carb---Both have flathead screwdriver openings.

Kenny

2stroke4life

Discussion Starter · #11 · Feb 22, 2010

Sorry I ment to say carb. I know where they are but after research I found out stock pilots are 40s so I am going to 42s just because its already got a lean pop that was almost sorted out with the air/fuel mixture screw but on start up it needs more fuel as well. Also gonna get some shims for the needles. Anyone know what needles you can run?

RobCatV

· #12 · Feb 22, 2010

Just a FYI - the Prairie stacks will only fit if you use the TwinAir Powerflow air filter; they won't fit inside a factory style air filter.

Kenny4

· #13 · Feb 22, 2010

Update your sig on the V as you change things---I am interested as to how it will perform with the 42 pilots---Also stock needles with a #4 washer or a Keihin spacer.

Kenny

2stroke4life

Discussion Starter · #14 · Feb 22, 2010

Will do for sure.

ERBE

· #15 · Feb 22, 2010

Prairie stacks?? what are these? Ya Im a newbiwe too.

RobCatV

· #16 · Feb 22, 2010

You replace the velocity stacks on top of the carbs with ones from a '02 Prairie (they are straighter and larger than the stock V-Force ones). They will only fit in the TwinAir Powerflow air filter. Gives you a little more power. Do a search on "prairie stacks" for several threads about them.

ERBE

· #17 · Feb 23, 2010

Thank You!!

hkunz

· #18 · Feb 23, 2010

Kenny4 said:
Hey 4stroke---Welcome to KR---Most of the guys on here will recommend the Twin Air Power Flow Kit---It's $89 at Rocky Mountain ATV----Jetting from 178-185---Start with 180 front and 182 rear---You can do a little seat tuning by putting tape over some holes in the lid and go back and forth.

Kenny

OK, I just went from 150/155 to 155/160 this last weekend, after I added the 6* key. You think it needs even more fuel? (this was on the green quad)

Kenny4

· #19 · Feb 23, 2010

hkunz said:
Kenny4 said:

Hey 4stroke---Welcome to KR---Most of the guys on here will recommend the Twin Air Power Flow Kit---It's $89 at Rocky Mountain ATV----Jetting from 178-185---Start with 180 front and 182 rear---You can do a little seat tuning by putting tape over some holes in the lid and go back and forth.

Kenny

Click to expand...

OK, I just went from 150/155 to 155/160 this last weekend, after I added the 6* key. You think it needs even more fuel? (this was on the green quad)

Don't understand the 42.5 pilots, (40 or 42)--Did you put 2 washers on each needle or one on each---He's opening his air box so that's why 180's---42 pilots and 2 shims on each seems rich for low and mid range---I don't think you have enough air flow for larger mains.

Kenny

hkunz

· #20 · Feb 24, 2010

Kenny4 said:
hkunz said:

Kenny4 said:

Hey 4stroke---Welcome to KR---Most of the guys on here will recommend the Twin Air Power Flow Kit---It's $89 at Rocky Mountain ATV----Jetting from 178-185---Start with 180 front and 182 rear---You can do a little seat tuning by putting tape over some holes in the lid and go back and forth.

Kenny

Click to expand...

OK, I just went from 150/155 to 155/160 this last weekend, after I added the 6* key. You think it needs even more fuel? (this was on the green quad)

Click to expand...

Don't understand the 42.5 pilots, (40 or 42)--Did you put 2 washers on each needle or one on each---He's opening his air box so that's why 180's---42 pilots and 2 shims on each seems rich for low and mid range---I don't think you have enough air flow for larger mains.

Kenny

It says 42.5 on the pilot jets, didn't know they should be whole numbers. I have several main jets also with.5 numbers. I've been running one "thick" washer, and one very thin washer on each needle on the green one, and one "thick" washer on each needle on the orange one. The orange has the stock air filter, the green has the K&N, that's why the difference in jetting. Both of them have the wall cut out of the airbox, and the stock snorkel removed. The green one has a scoop on the opening that runs out under the fender, the orange on has no snorkel at all. I plan to put the hose snorkel mod on both when I get a chance. I don't like the 12 hole mod, the air doesn't seem to be as "nice" there as what I'd like. I plan to pull from the top of the radiator to get the coolest air possible, and cut the hood open to collect outside air.

Eventually I'd like to have the Prarie stacks, twin air filter, and dual snorkels on the green one, and move the K&N to the orange one. This is because i think (no real proof) that the Muzzy pipe is slightly better than the FMF, and I don't want to have two identical quads with identical costs for new parts.

Any input is welcome

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