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Senior Member
Cold Weather Jetting
I guess I should post this here. I live in NE Wisc and it just snowed a ton and now my quad runs like SH*T!!!. I have a 42 pilot and a 160 main screw 2.5 turns out with the R4 system and no air box lid. The box filled with snow, It ran horrible. Then cleaned it out and put the lid back on and it still ran horrible. I think its the jetting but not sure. It would pop when you let off the throttle and it wouldnt idle. Please help. Oh ya its any wheres 0 to 32 degrees.
2001 Yellow 400ex
WB R4 full system
Uni air filter
No airbox lid
160 MJ 42 PJ
Tusk handle bars
Tusk Nerfs
MSR Gripper Levers
Black Maier Handguards
Titax 14 tooth front sprocket
Kenda Klaw Rear 20in.
All Balls axle bearings
Front 21" Razr PR on flipped stockers
WB rev box
Custom black plastic a-arm guards
Powder Coated things
ALL IN PIECES 4 WINTER REBUILD!!!
Ride hard or Die hard
put ur main jet up a couple of sizes...adn put some heet in ur gas maybe u got some iceor water in ur line too....the rest of ur jetting should be fine then too...or else u nmight have to fiddle with ur idle speed..
2002 400ex>>>>>>>>>John Deere Green PC Frame,Gussetted, Houser +2,+0, HMF, AC Racing Nerf Bar W/ D.C.R.P Kick-Ups, Wiseco 440, Ported & Polished, Elka Fronts, RPM Dominator Axle, RPM Anit-Fade, PRM Grab Bar & Bumper, UNI Air Filter No Lid Custom Airbox Tabs, Douglas Black Label Beadlocks w/ James Lucky Reinforcing Ring, MSR Raptor Shorty Perch And Lever, Motion Pro Clutch And Throttle Cable, R.A.D. Tapered Bearing Carrier, Tag Bars, O.D.I Lock Clamp Grips, L.S.R. P.B. Block-Off, DID X-Ring Chain, Pro Design Tether, Dirt Bike Starter Button, Removed Choked, YUASA Fire Power battery, Armor Tech Rev Box, Black Maier Race Fronts & Rear Fenders, Streamline Steel Braided Breaklines, Nacs Mud Caps, Mod Quad Breather Tube, Omf Seat Bracket, Moose Aluminum Case Saver, Shock Pros Shock Covers
#20
Great Lakes Quad Series
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Member
I run an FMF Power Core 4, open lid, K&N filter. I have the snorkel hole blocked also. I run a 170 main and 42 pilot. All I had to do to richen mine up enough is put he airbox lid back on, and re-install the snorkel. Trick I was told to try by my dealer, to reduce the air amount instead of increase the amount of fuel. If that didnt do it, then I would have to re-jet. Runs great, and plug looks great as well. Sure beats having to mess with jetting to hit it right. It was approx 20 out yesterday, and started right up and ran great. I would go up a size or two, depending on the average cold weather temp. I have been told by many, if cold weather jetting is needed, that for every 20 degrees colder is a full main jet size increase.
2002 Honda 400EX
--FMF Power Core 4
--airbox lid removed, K&N air filter w/outerwear
--42 pilot, 170 main
--Wiseco 11:1 piston
--Hotcams stage 2
--Race-cut front fenders
--Quad Boss nerfs
--B&M Racing Air Scoops from Pro-Fab atv
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