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WARMING UP A COLD ENGINE


Washburn

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Whenever I start my shee up cold it sputters like you have the choke on. even after I warm it up and take it out. I blast through first gear hit the powerband total sputter. 2nd gear sputter but a little less, 3rd gear it gets better then I usualt put it back into first and it runs smooth and quick through all of the gears. Could this be the start of a problem? I dont think my plugs have anything to do with it theyre pretty new and Oh it starts first or second kick every time.

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If it just does it the first time you run through the gears i would just say that your just cleaning it out.

 

Yep, have to agree. Don't expect to let it idle for a bit, and take it out and have it dead on first time through the gears. There is a big difference between "warm" when it is sitting there idling with no load on the engine. Take it a little easier through first and second and "cycle" the throttle a bit and you should feel/hear etc when it clears out.

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It sounds like you might not be letting it warm up enough. Its continuing to sputter because the engine isn't hot enough to run properly. Maybe try and let it warm up a little longer next time and see if it helps. I know I get ansy sometimes and take off too soon and mine would do that same sorta thing. If I let it warm up more it wouldn't do it.

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Yep, have to agree. Don't expect to let it idle for a bit, and take it out and have it dead on first time through the gears. There is a big difference between "warm" when it is sitting there idling with no load on the engine. Take it a little easier through first and second and "cycle" the throttle a bit and you should feel/hear etc when it clears out.

 

Ok so I guess sitting there in nutral reving the shit out of it trying to blow all the shit out that way isent good for anything then. Just let it idel for about 5 minutes before I take it out?

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Mine starts first kick with or with out choke........and then I let it Idle for at least 2 min.........good to go :beer:

 

Yeah, being jetted correctly is always a good thing!

 

It doesn't matter if your jetting is spot on and you are trying to ride in -15

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Yep, you're not letting it warm up enough. Ive got mine torn down right now, and theres some tell-tale signs of it not being warmed up enough. I usually let it warm up enough that it was warm to the touch, but it would still sputter like you're saying. Well, if you're ever seen a cylinder and pistons that siezed, thats about what happens. Mine had marks evenly spaced around the cylinder were the cross hatch was worn smooth, and the piston had matching marks on it. True it never actually siezed on me, or had any problems, but that was more wear than I would have had otherwise. I learned my lesson.

 

It really takes at least 5 minutes on a warm day for it to warm up. Cold winter like some of you up north have, Im sure it would take 10 minutes at idle to warm up. A truly warmed up engine isn't just warm to the touch, its hot to the touch.

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Damn, Guys I knew it was important to warm her up but I dident know exactly for how long and why. Now I know thank you all for the kick ass info :beer:

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Damn, Guys I knew it was important to warm her up but I dident know exactly for how long and why. Now I know thank you all for the kick ass info :beer:

 

Yea, my quad and others I've owned whether 2 or 4 stroke always a sputter a little when first driven after a 2min warm up. The engine just has to get up to operating tempatures and some engine load and your fine.

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On a water cooled two stroke (not sure about 4 poke) blip the throttle every few seconds just a little, that will help it warm up quicker?

 

Why?

 

It circulates the water faster throughout the engine. The coolant in the radiator is cold...only that next to the engine is warm...and, since there is no T-stat...it's constantly circulating, it doesn't stay in the engine long enough to heat up...like it would on your car.

 

Now...blipping the throttle moves it along quicker so it doesn't have as much time to go through the radiator and cool back down.

 

You've all seen a motocross or supercross race with the guys blipping the throttle on the line, right? They're trying to warm their bikes up more completely and faster....

 

I let mine warm up for 2 or 3 minutes (summer temps) and blip the throttle 1/4 to 1/2 every few seconds....and I take off it's ready to go. I also touch the head to make sure it's nice and warm. Pipes are the first thing to heat up...you'll get a false impression from them.

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