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Old 07-12-2011, 06:00 PM   #1 (permalink)
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re-jet for big bore and slip on

i'm boring out my cylinder .020 and i have an hmf slip on. i know before i did the bore kit that the carb never got jetted for the slip on so i'd like to hear from you guys what jet sizes i should get and where i should get them.
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Old 07-12-2011, 06:05 PM   #2 (permalink)
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What size quad and year?? .020 is like 1/2 mm over stock plenty of meat left for future work.
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Old 07-12-2011, 06:11 PM   #3 (permalink)
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it's a 2004 400ex. but i'm only doing 20 over because i dont need to much power yet. still a beginner. never ridden a motorcycle or a quad, and i only rode my quad 2 times for about 10 miutes a piece.
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Old 07-12-2011, 06:44 PM   #4 (permalink)
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For a slip on and (I assume the .020 is what, a 426?), if thats all your running probably a 160 main jet, what do you think moose, 42 pilot? Now if your running an open airbox lid you’ll want to run a 175. What other mods do you have going? Dyno jet makes good kits, I’m very happy with mine. However, if you want to buy individual jets rockymountainatv/mc.com sell them but if you want to go that way you’ll need a 175 to 177 main jet for just the bore kit and slip on, and if your running an open airbox lid you’ll want to go with a 192 to 195 main jet, reason being that keihin jets and dyno jets are sized differently.
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K&N Powerlid
Lexx MXe slip on
Armadillo full body and swing arm skid plates.
450r front suspension


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Old 07-12-2011, 07:53 PM   #5 (permalink)
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Originally Posted by DAN400ex View Post
For a slip on and (I assume the .020 is what, a 426?), if thats all your running probably a 160 main jet, what do you think moose, 42 pilot? Now if your running an open airbox lid youíll want to run a 175. What other mods do you have going? Dyno jet makes good kits, Iím very happy with mine. However, if you want to buy individual jets rockymountainatv/mc.com sell them but if you want to go that way youíll need a 175 to 177 main jet for just the bore kit and slip on, and if your running an open airbox lid youíll want to go with a 192 to 195 main jet, reason being that keihin jets and dyno jets are sized differently.
A 400EX is actually 398cc .020 is .5 over stock making it about a 402cc.
42 pilot is always good with a slip-on and filter 180 keihin hex without the lid 190 hex jet. dynojet would be roughly 160 with the lid 170 without
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"MOOSE WAGON "
91 TRX250X aka "MOOSE WAGON"
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
00 TRX350TM 4X2 (Resale bike)
01 TRX250EX (TLC Needed)
74' CB360 (future FrankenQuad)
Work in progress

JETTING

MOOSE_WAGON_makeover

2000_Rancher_build
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Old 07-13-2011, 02:08 AM   #6 (permalink)
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Alright thanks for your answers. I don't have any other mods just the bore and slip on. But is there any difference in power with the open lid air box?
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Old 07-13-2011, 05:11 AM   #7 (permalink)
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Yes there is a difference. but you will have to clean your air filter more often.
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"MOOSE WAGON "
91 TRX250X aka "MOOSE WAGON"
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
00 TRX350TM 4X2 (Resale bike)
01 TRX250EX (TLC Needed)
74' CB360 (future FrankenQuad)
Work in progress

JETTING

MOOSE_WAGON_makeover

2000_Rancher_build
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Old 07-13-2011, 10:12 AM   #8 (permalink)
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ehh that's alright. i can handle that. so how do i go about breaking this thing in when i get it rebuilt? and how can i tell if i neede a new timing chain? and how does that tensioner work? i just want to make sure i get it right.
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Old 07-13-2011, 02:06 PM   #9 (permalink)
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if you need a service manual look in the manuals and schematics section there is a free download there.

HOLY CRAP!!!! I sound like deeperinthebush...LMAO
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"MOOSE WAGON "
91 TRX250X aka "MOOSE WAGON"
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
00 TRX350TM 4X2 (Resale bike)
01 TRX250EX (TLC Needed)
74' CB360 (future FrankenQuad)
Work in progress

JETTING

MOOSE_WAGON_makeover

2000_Rancher_build
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Old 07-13-2011, 02:12 PM   #10 (permalink)
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Quote:
Originally Posted by TRX2fiveO View Post
if you need a service manual look in the manuals and schematics section there is a free download there.

HOLY CRAP!!!! I sound like deeperinthebush...LMAO
I heard that Meese,errrrr Moose...
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