Engine

X's&O's · Post by **X's&O's** » Fri Jul 22, 2005 1:37 am

Hello everyone, I'm new to this site so I hope someone can help me out .I've been told that its NOT necessary to let your sled warm up, just pull the rope or turn the key and away you go, that fast. But if I dont let them idle for a few min. (2-5) it boggs down when I hit the gas. If I dont wait and let it warm up I have to double pump the throttle (rev up the RPM's first) then its works until it does warm up. I've put all new gasket's in both kawi & CCW motors top to bottom and checked for leaks, also rebuilt the carbs. mikuni & walbro and they both act the same way there on a sportfire and a 400. I did go through the specs. on this sites main page and did what it said about ajustments and still the same resolute.

Just looking for a few helpfull tips.

thanks. JC

sporty440 · Post by **sporty440** » Fri Jul 22, 2005 10:50 am

I always warm them up for a couple minutes. As a master tech I was always taught that its not good to revv up a cold engine so I let them idle for a bit
and they go great.

Deere Daze · Post by **Deere Daze** » Fri Jul 22, 2005 2:06 pm

Always let the enigne warm up.

1977JD300 · Post by **1977JD300** » Fri Jul 22, 2005 7:31 pm

you should always warm your sled up before taking off on it, but if the sled does not run good after it is warmed up and you have replaced all seals/gaskets and the carb is working right then maybe you should check your external ignition coils, if it is only running on 1 cylinder after it is warmed up then most likely one of the coils is gone, they work fine when cold but do not give spark when they are warm if they are bad.

X's&O's · Post by **X's&O's** » Fri Jul 22, 2005 10:05 pm

Yes it runs fine after it warms up.

jdsledhead · Post by **jdsledhead** » Sat Jul 23, 2005 7:22 pm

Yes you are supposed to let your engine warm up. the reason for this is so the rings/pistons/ and cylinder walls reach the same temperature. You want an even temp before you start to romp on it and give it lots of RPM's because these parts expand at different rates. If its not warmed up you could sieze the motor....a rare occurance, but i have seen it more than once.

Rodimus Prime · Post by **Rodimus Prime** » Fri Aug 26, 2005 6:56 pm

reving out a cold motor melts the rings into the pistons and scores the pistons and cylinderwalls badly.. whoever told you not to warm up any engine is wrong .

sportnut · Post by **sportnut** » Thu Dec 08, 2005 11:32 pm

Walk into any dealership or sled shop and ask them about cold seize. Lots of people every year lose ther waranty on there brand new sled because they didnt let it warm up and cold seized a motor ! Feul atomazation is best when the combustion chamber is at normal operating temp. A cold motor is a lean motor when your bog accoured if you were to flip the choke it would probably take off. My sport does the same thing when my son rides it "rushes" it.

JDXsand00s · Post by **JDXsand00s** » Sun Dec 11, 2005 8:50 pm

How long does it take for an engine to warm up sufficiently? I never warm up my engines (though I should) because none of my sleds will idle and they are so tempting to just hop on and ride. I usually ride them with the choke open for a few seconds to counter the lean environment but on all of my sleds that run it seem like it only takes about 10 seconds of riding and then they run like a charm.