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  #1  
Old 08-05-2004, 08:43 PM
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Question Warm Up - 2 Stroke

Do you even need to warm up 2 strokes? Chain-saws and such, people just fire them up and start using them. Whats the advanatage of actually warming up a 2 stroke engine? Since the oil is all right there, cant you just gas and go?

On my little scoot (50cc 2 stroke) I usually just start it with the choke, let the choke off, blip the throttle alittle bit and take off. Would a motocross bike be any differant?

Thanks
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  #2  
Old 08-05-2004, 08:55 PM
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Default Re: Warm Up - 2 Stroke

not a whole heck of a lot different..but the bikes by defenition "warming them up" is to allow the cylinder to expand with the faster expanding piston...as well the clutch oil (being a wet clutch system) also needs to move around a bit...when the trans is cold on a 2 smoke no matter how many times you pull the clutch in...nothing happens...the clutch plates are "static" with oil..untill the oil gets sloshed around a bit...the trans in basicaly stuck in gear

it dosnt take a lot to warm up a 2 stroke bike...just a few minutes of easy throttle...just to let everything expand
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  #3  
Old 08-05-2004, 08:59 PM
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Default Re: Warm Up - 2 Stroke

ya i always always warm up my bikes. ive seen cylenders that were horrible because someone was in too big of a hurry.
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  #4  
Old 08-05-2004, 09:28 PM
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Default Re: Warm Up - 2 Stroke

Cold seize a bike once....

and I guarantee you'll remember to warm it up everytime after that.
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  #5  
Old 08-05-2004, 09:53 PM
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Default Re: Warm Up - 2 Stroke

Well i when i dont warm my bike up enough when i go WOT it just kind of sputters and no power so i just putt around for about five minutes.
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  #6  
Old 08-05-2004, 09:54 PM
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Default Re: Warm Up - 2 Stroke

I just let it idle till the radiators feel a little warm. Then I ride for a few minutes just in first gear under half throttle. It's not rocket science, just get it good and warm before opening it up.
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Old 08-05-2004, 09:56 PM
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Default Re: Warm Up - 2 Stroke

I always warm up my bike at a low idle....barley running then after a few minutes sum blips and then I jus take a 1/4 - 1/2 rip down the street to the trails then I whomp on it.
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Old 08-05-2004, 10:17 PM
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Default Re: Warm Up - 2 Stroke

Always warm it up. That includes your weed wacker and lawn mower.

If it's got an engine, it should be warm before you use it. Just makes for a longer lasting engine and GREATLY decreases your chances of a siezed engine or increased engine wear.
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  #9  
Old 08-05-2004, 10:42 PM
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Default Re: Warm Up - 2 Stroke

the difference between a MX bike and a weed wacker is that the bike costs allot more. Running your bike hard without warm up is a sure way cause premature wear and lose performance.
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  #10  
Old 08-05-2004, 10:51 PM
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Default Re: Warm Up - 2 Stroke

LOL, yeah, but the weed wacker still costs money to fix. Warming it up, is still a good idea regardless of price, since it would seem to me that longevity is always a goal.
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  #11  
Old 08-05-2004, 10:58 PM
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Default Re: Warm Up - 2 Stroke

this is a very good topic, becuase i am about to buy a 2 stroke 4 wheeler.
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  #12  
Old 08-05-2004, 11:02 PM
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Default Re: Warm Up - 2 Stroke

I'm bad about warming things up...even when I get in a vehicle I want to warm it up...


Ok umm...it might just be me, but for some reason that stuff that I said up there does not sound right...
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  #13  
Old 08-05-2004, 11:35 PM
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Default Re: Warm Up - 2 Stroke

THAT DOESNT SOUND RIGHT ALEX!
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  #14  
Old 08-05-2004, 11:41 PM
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Default Re: Warm Up - 2 Stroke

Quote:
Originally posted by drman
I'm bad about warming things up...even when I get in a vehicle I want to warm it up...


Ok umm...it might just be me, but for some reason that stuff that I said up there does not sound right...

uhm.... I don't know; I'm thinking doing this sort of thing could get your picture in the paper, and a little talk with the folks down at the station.
jim
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  #15  
Old 08-06-2004, 01:00 AM
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Default Re: Warm Up - 2 Stroke

LMAO.. Oh man
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  #16  
Old 08-06-2004, 04:17 AM
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Default Re: Warm Up - 2 Stroke

Especially with 2-stroke MX bikes. They need or should be warmed up thoroughly. You want all parts to warm up at reasonably the same speed.

If you go out and rev the thing from the get go, then that brings in the chance of cold seizing. This is a result of the piston heating up quickly while the cylinder hasn't been left to warm up properly.

Therefore, when the piston gets hot (expands) and cylinder still cold (same size), it expands until it catches on the bore and cold seizes.

But don't think you can't "cold seize" your bike if you have warmed it up thoroughly! Sorry, but you can. Given the right circumstances and conditions your bike can seize. Say you've been riding on a MX track for a while. Then you decide to head up the road for a bit. You are cruising along. Your bike suddenly stops dead and you find out it had cold seized.
This can happen from a mixture of these situations:

* High revs and low throttle openings= piston and heating, expanding, low lubrication from no fuel (and therefore no oil)

* Plenty of air passing through radiators, cooling of cylinder, and therefore shrinking the cylinder while piston is getting larger and oil is not being delivered.

Scary when you think about it. Usually the cold seizure is indicated from "4-point seizure" shown below



FOUR-CORNER SEIZURE
This piston has vertical seizure marks at four equally spaced points around the circumference. A four-corner seizure is caused when the piston expands faster than the cylinder and the clearance between the piston and cylinder is reduced. Another common problem of this type is a single point seizure on the center of the exhaust side of the piston. However this occurs only on cylinders with bridged exhaust ports. The main causes for this problem are too quick warm-up, too lean carb jetting (main jet), or too hot of a spark plug range.
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  #17  
Old 08-06-2004, 08:39 AM
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Default Re: Warm Up - 2 Stroke

learned something new today
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  #18  
Old 08-06-2004, 02:31 PM
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Default Re: Warm Up - 2 Stroke

I let my bikes warm up for a few minutes while I am putting my gear on. That way there is no wasted trail time
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