2004 pro xr 440 carb troubles

tyler ryan · 01-14-2011, 08:19 PM

hey guys i need some help/opinions.
i had my 440 out for the first run of the year today , and i noticed a studder in the engine. when stopped , if i tried to give the sled full throtle at a dead stop it would take off slowly and almost like it was loading up on gas , it felt as if it was running on one cylinder , let off the gas and ease it on to full throtle and the thing takes off like a rocket , and it does the same again if cruising at half throtle for extended periods of time and then go right to full throtle again and it does the same studder it does when stopped to full throttle , anybody have any encounters similar to this or got an idea on what it could be?
i was thinking maybe changing the clip position on the needle valve?

anybody have any ideas? it would be VERY apreciated

SnoPro420 · 01-14-2011, 09:49 PM

tell us what you have for a set up in the carb now?????? main jet size, needle clip position, pilot jet size

tyler ryan · 01-15-2011, 07:46 AM

i was hoping it was something simply diagnosed like chipped reeds or something
as for my setup i would imagine it is close to stock , i have only had this skidoo over the summer and i didnt want to take the carb apart untill i knew where the sled was too in regards to how it runs.
so to answer your questions im assuming it is stock , the sled was trail converted by the polaris dealership , so if there is any carb issues involved with trail converting this sled then it was done by the dealer , otherfrom that i think it could be pretty well stock. sorry for the lack of info

cbutch · 01-15-2011, 01:34 PM

The polaris specs are way off as far as jetting is on this thing. Also dont keep it a partial throttle as it will run lean. They were not designed to run there and the needle is to lean. You have to have a sort of snowx throttle on and off.

motorhead1216 · 01-16-2011, 12:37 AM

Clean your carbs! And put in a fresh tank of gas. I say this as you state that this was the first run of the year. If your like most of the guys I here about you take it off the trailer and try to go. I clean my carbs every year before I ride any of my sleds just because you never know and it dosn't matter how much stabile you put in the tank. I have had the pilots get gunked up using that as well. Clean the carbs.

tyler ryan · 01-16-2011, 12:00 PM

turns out it was just the homemade can leaning out the engine , put the stock silencer on it and it was a completely diffrent machine , if i puts it back on ill just richen it up in the carb , but for now i think its going to stay as is.
thanks very much for the good info , not so much for dirty comments
thanks guys!

cbutch · 01-16-2011, 12:47 PM

Dont worry about the comments and continue to ask questions. That is how I learned lots of reading with a few questions here and there. Your going to love the sled.

tyler ryan · 01-16-2011, 08:56 PM

yeah i love the sled man! it has wayy more power then any of the mxz 440's i ride with. i am completely overwhelmed with the power it has.

akiqpilot · 01-17-2011, 01:50 AM

Quote:

Originally Posted by tyler ryan

yeah i love the sled man! it has wayy more power then any of the mxz 440's i ride with. i am completely overwhelmed with the power it has.

You say the sled was trail converted by the dealer? If possible you should ask the dealer if they put the trail needle in the carbs. The trail needle adds fuel in the 1/4 throttle range and will prevent to motor from burning down.

Also, run the timing box on "E", you could run "F" or "G" if you get a batch of bad fuel but "E" is the setting for Pump Gas.

Also, Pump Gas means 92 octane and nothing less. Running inferior fuel is not good for this motor.

Also, the '04 440 has an issue with the center bearing on the crank. If the dealer or you haven't already addressed this issue then you are on borrowed time. The sled won't make it past about 10-15 tanks of fuel and you will blow the crank. There is a thread in the pinned topics discussing different ways to fix this problem. Every tank of fuel you run through the motor is taking life off the crank. This issue must be fixed or you will be very dissapointed here very soon.

Don't drive the sled like a sally, it's meant to be driven hard. Thats how it should be ridden, like a dirt bike. On and Off the throttle continually.

tyler ryan · 01-17-2011, 03:09 PM

regarding the badbearing issue. how will i know that its fixed? how will i know if it is going??
and were there some recall on the bearing or something that the dealer put in a longer lasting bearing?

01-14-2011, 08:19 PM	#1 (permalink)
tyler ryan Member Join Date: Mar 2010 Posts: 22	2004 pro xr 440 carb troubles hey guys i need some help/opinions. i had my 440 out for the first run of the year today , and i noticed a studder in the engine. when stopped , if i tried to give the sled full throtle at a dead stop it would take off slowly and almost like it was loading up on gas , it felt as if it was running on one cylinder , let off the gas and ease it on to full throtle and the thing takes off like a rocket , and it does the same again if cruising at half throtle for extended periods of time and then go right to full throtle again and it does the same studder it does when stopped to full throttle , anybody have any encounters similar to this or got an idea on what it could be? i was thinking maybe changing the clip position on the needle valve? anybody have any ideas? it would be VERY apreciated

01-14-2011, 09:49 PM	#2 (permalink)
SnoPro420 Super Advanced Member Join Date: Nov 2006 Posts: 1,474 Current Sled(s): 2011 IQr 600mod Previous Sled(s): 01, ProX440, 02,04,06 440/600mods Location: Burlington, WI Favorite Riding Area: U.P. MI & Steamboat springs CO 10-11 Mileage: 500 09-10 Mileage: 250 Age: 24 Riding Since: 3	tell us what you have for a set up in the carb now?????? main jet size, needle clip position, pilot jet size __________________ In Loving Memory of Sam McLam #163 We Miss You! Current Sleds:2011 Poo IQr 600mod Previous Sleds: 01 ProX440, 02 Cat SnoPro440, 04 Cat SnoPro440, 06 Cat SnoPro440, 06 Cat Factory 600mod, 2010 IQr 600mod O.I.F. - O.E.F. Combat Vet 2007-2011

01-15-2011, 07:46 AM	#3 (permalink)
tyler ryan Member Join Date: Mar 2010 Posts: 22	i was hoping it was something simply diagnosed like chipped reeds or something as for my setup i would imagine it is close to stock , i have only had this skidoo over the summer and i didnt want to take the carb apart untill i knew where the sled was too in regards to how it runs. so to answer your questions im assuming it is stock , the sled was trail converted by the polaris dealership , so if there is any carb issues involved with trail converting this sled then it was done by the dealer , otherfrom that i think it could be pretty well stock. sorry for the lack of info

01-15-2011, 01:34 PM	#4 (permalink)
cbutch Super Advanced Member Join Date: Feb 2007 Posts: 617 Current Sled(s): 03 Proxr 440 Previous Sled(s): 1994 Indy 440 Location: NE Ohio 09-10 Mileage: 700 Age: 19 Riding Since: 1993	The polaris specs are way off as far as jetting is on this thing. Also dont keep it a partial throttle as it will run lean. They were not designed to run there and the needle is to lean. You have to have a sort of snowx throttle on and off.

01-16-2011, 12:37 AM	#5 (permalink)
motorhead1216 Member Join Date: Jan 2011 Posts: 23 Current Sled(s): 2002 Pol PRO X 440 Previous Sled(s): 02 XC800X, 96 XLT, 02 ZL800, 02XC800, et Location: GR, MI Favorite Riding Area: Anywhere with snow. 10-11 Mileage: 0 work! 09-10 Mileage: 750 Age: 44 Riding Since: 1972	Clean your carbs! And put in a fresh tank of gas. I say this as you state that this was the first run of the year. If your like most of the guys I here about you take it off the trailer and try to go. I clean my carbs every year before I ride any of my sleds just because you never know and it dosn't matter how much stabile you put in the tank. I have had the pilots get gunked up using that as well. Clean the carbs.

01-16-2011, 12:00 PM	#6 (permalink)
tyler ryan Member Join Date: Mar 2010 Posts: 22	turns out it was just the homemade can leaning out the engine , put the stock silencer on it and it was a completely diffrent machine , if i puts it back on ill just richen it up in the carb , but for now i think its going to stay as is. thanks very much for the good info , not so much for dirty comments thanks guys!

01-16-2011, 12:47 PM	#7 (permalink)
cbutch Super Advanced Member Join Date: Feb 2007 Posts: 617 Current Sled(s): 03 Proxr 440 Previous Sled(s): 1994 Indy 440 Location: NE Ohio 09-10 Mileage: 700 Age: 19 Riding Since: 1993	Dont worry about the comments and continue to ask questions. That is how I learned lots of reading with a few questions here and there. Your going to love the sled.

01-16-2011, 08:56 PM	#8 (permalink)
tyler ryan Member Join Date: Mar 2010 Posts: 22	yeah i love the sled man! it has wayy more power then any of the mxz 440's i ride with. i am completely overwhelmed with the power it has.

01-17-2011, 03:09 PM	#10 (permalink)
tyler ryan Member Join Date: Mar 2010 Posts: 22	regarding the badbearing issue. how will i know that its fixed? how will i know if it is going?? and were there some recall on the bearing or something that the dealer put in a longer lasting bearing?

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