sno pro 440 could use some help

[woodsracer144]

ok my friend is workin on a sno pro 440 and when you start it up it will rev way up and then it will die down and then kill, and we cant get it to work, we though that the fuel pulp lines were hooked up wong, but they werent, i dont know what to do any more,

[coolex]

clean the carbs

[400exstud]

Last I heard, sleds didn't have a fuel pump. Am I behind the times?

[1fst400]

sell it and buy a ski doo :devil:


But it sounds like its not getting fuel. Try cleening the carbs. new fuel pump also. They are a mechanical pump that operates off crank case pressure. They are cheep. If that doesent work you could have bad crank seals.

[400exstud]

Damn killer bees!

Last weekend I got to race my pa's ZRT 800 against by cousins new MXZ 800 Blizzard. He killed me off the line but once that big tripple got rolling I cought and passed him. I would not be afraid to say that his is the faster trail sled. The ZRT is the lake king:macho

[woodsracer144]

he has striped the carbs and cleaned them all, when you let it idol it reves way up there and then dies, it might be the crank seals. but im not sure, ant thing els, i thought that it would be the base gasket

[krt400ex]

there is air gettin in somewhere making it lean....that is wut is happening. the jetting might be lean too...i dunno, but it is very very lean

[woodsracer144]

ok, do you think that its a gasket or the crank seals?

[krt400ex]

when he redid the engine did he have to split the cases?

they might have not been put together correctly, or there might be a gasket leak in there...

it is most likely in the crankcase not the top end or bottom end gasket....but it might be the bottom end gsket.


it if was any of those gaskets thoght, u would probably see water leaking through....so idoubt it is the head or base gasket.

[woodsracer144]

all he did was work on th carbs he hasnt split the case or any of that, hes workin on it for a friend and im helpin him, and we cant find out whats wrong so that s why im postin this

any thing els? if its over 400 hes just gonna part it.

[krt400ex]

then i would take the carbs apart again, and give them a super cleaning...use compressed air and blow it through all the passages...make sure there is no clogs...


also, make sure that the float bowl is sealing completely to the rest of the carb when u bolt it back together....

did he change the jetting? add anythinng that would require a change in jetting?

[woodsracer144]

not that i know of, i cant tell you tommrow. what is done tothe sled of after markets.

[wheeltrax]

im guessing either crank seals or carb boots (betwen carb and engine. As mentioned before, it is sucking in air creating a lean situation.