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Old 10-27-2012, 09:45 AM
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4-stroke vs 2-stroke warm up time

Hello all!
I own a 1995 Polaris magnum 425 4X4 (4 stroke) and my brother owns a 1992 Polaris trail boss 250 2X4 (2 stroke). We also have two Polaris snowmobiles, a 1997 Polaris trail touring and a 1999 Indy 340 sport lite (both 2 strokes as well), and last but not least a 1992 Yamaha wave runner 650 (2 stroke).

I know people are always talking about letting the engine warm up before you use it. It makes sense with the four stroke engines because it lets the oil warm up and get in all the moving parts (i usually let my magnum warm up approx. 1 minute and go really easy on the throttle for the first little bit) but with 2 strokes there is no oil to warm up, so do they need time to warm up? It makes sense to let the metal parts warm up, but I always think of 4 strokes needing warm up time and 2 strokes needing less if any.

What are your opinions?
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Old 10-27-2012, 09:57 AM
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My 2 - stroke leaf blower will not rev at all unless it warms up good. It struggles, falters and sometimes stalls until warmed up good.

Just one example.
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Old 10-27-2012, 10:04 AM
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I agree with you on that, fly. When it is really cold the 2 stroke atv and both snowmobiles usually will die if i attempt to rev them at all and need 30 seconds to a minute to warm up before they will rev up or move at all.
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Old 10-31-2012, 04:53 PM
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Anyone?
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Old 10-31-2012, 05:12 PM
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It's hard on ANY machine to put it under load while its still cold. Don't matter if its the family car, a D10 caterpillar bulldozer your tractor, weedeater, lawn mower or your dirt machine. I often wonder why common sense so uncommon?
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Old 10-31-2012, 05:18 PM
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Polman500, how long should I let my four stroke ATV warm up? What about the 2 strokes?
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Old 10-31-2012, 05:35 PM
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2 strokes need to be warmed up good before running them to hard. Cold seizure will happen and screw the piston and cylinder. I let the sled warm up until the heat exchanger is warm to the touch.
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Old 10-31-2012, 05:38 PM
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Thanks chillywilly, good to know!
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Old 10-31-2012, 05:43 PM
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My thinking is to let them ( 2 or 4 stroke ) warm until when you apply the throttle there is no hesitation, usually about 1 minute, and then drive sensibly for a few minutes before running it hard.
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Old 10-31-2012, 06:01 PM
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That's what i was thinking Diesel man 03, thanks for the response!
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