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Part Throttle bad for 2-strokes? #5169328 07/23/19 09:12 PM
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92saturnsl2 Offline OP
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Today I was blowing grass off the porch & concrete after mowing and my neighbor stopped me and asked if my leaf blower was a 2-stroke. Yes it is, then he offered the advise that it's bad to run a 2-stroke at part throttle, it will kill or shorten the life of the engine. News to me, I have always used about half throttle when moving grass clippings around, if for no other reason than I don't need full throttle (unless I'm blowing wet leaves or something), and it's not as loud.

This is the same neighbor that tells me every year to turn my heat pump to the emergency heat setting when it gets cold out, so naturally I take his advise with a huge grain of salt.

Is there any smidgen of truth to the idea that it's somehow harmful to run a 2-stroke at less than full throttle? I can't imagine this being accurate; in the case of my weed eater (2-stroke Echo SRM-266) I believe it would be downright dangerous to do most of my trimming at full throttle, that thing has serious power behind it. Wonder where he got this info, anyone ever hear this before?


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Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169330 07/23/19 09:16 PM
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ammolab Offline
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You know millions of 2 stroke motorcycles once cruised at “part throttle” their entire life....

Last edited by ammolab; 07/23/19 09:17 PM.

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Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169333 07/23/19 09:18 PM
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WyrTwister Offline
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Only thing I can think of would be if it had to do with cooling?


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God bless
Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169339 07/23/19 09:22 PM
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Chris142 Offline
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I guess full throttle would mean more gas and hense more oil. I dont think it matters myself. I do believe that coasting down hill with no throttle will starve it of oil.


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Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169345 07/23/19 09:28 PM
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gathermewool Offline
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Low temp fouling of the exhaust?


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Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169353 07/23/19 09:46 PM
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spackard Offline
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I'll say no.

BTW, a leaf blower is a great load for a 2-stroke. Always under load, and load increases with cube of speed.

Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169379 07/23/19 11:13 PM
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bobdoo Offline
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Having been highly successful in modifying 2T cycles, I can comment on the typical 2T jetting being more rich than absolutely necessary, to keep head and piston crown temps down. Two-strokes develop a huge amount of heat at peak power. If they are jetted too lean, you can burn a hole through the piston crown in a few *seconds*. That's how long it took my RD350, when I mistakenly jetted leaner after leaving a shop rag partially over the airbox intake.

That rich a mixture would make the engine burble at part-throttle, and would tend to foul the sparkplug.

You can see how your tool is working by running it at part throttle for 20-30 seconds, then instantly cutting the ignition, and pulling and reading the sparkplug. If it is whitish, or has *any* aluminum beads (they will be *tiny*) on it, you need to richen the mixture.

Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169405 07/24/19 03:27 AM
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Fawteen Offline
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Originally Posted by 92saturnsl2
my neighbor stopped me and asked if my leaf blower was a 2-stroke.


Your first clue that your neighbor is an idiot is that he can't tell that it's a 2 stroke just by listening to it. Smile, thank him, and go on about your business.

Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169412 07/24/19 03:57 AM
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demarpaint Offline
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News to me. I've run two stroke line trimmers at mostly part throttle with occasional WOT bursts when needed for decades. They last me a very long time.


God Bless Our Troops

Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169434 07/24/19 04:53 AM
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Shannow Offline
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The ;ubricant flow into the engine is controlled by the fuel flow.

extended part throttle is generatlly OK...but per AG Bell, (IIRC), going from heavy trailing throttle to full bore can, for a short period of time mean less than adequate lubrications.


If it's the truth....it can handle the pressure !!!
Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169436 07/24/19 05:03 AM
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There are lots of 2 stroke boat motors that idle all day trolling for fish. Half throttle will not hurt it at all.


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Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169438 07/24/19 05:08 AM
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Lapham3 Offline
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I've run numerous 2 stroke motorcycles, boat motors, chain saws and blowers for 50 years and the only issues I ever had were fuel/air ratios running some of the scooters when living near Denver and then riding into the thin air of the mountains=too rich. I've never had an oiling problem at any throttle setting or anything else.

Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169461 07/24/19 05:57 AM
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Eddie Offline
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2 STROKE engines on leaf blowers are used in totally different ways than other 2 strokes. I do think they are set up to run primarily at full throttle for cooling and best performance. I doubt that running 1/2 or 3/4 throttle will make much difference though. Ed


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Re: Part Throttle bad for 2-strokes? [Re: Fawteen] #5169463 07/24/19 05:59 AM
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atikovi Offline
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Originally Posted by Fawteen
Originally Posted by 92saturnsl2
my neighbor stopped me and asked if my leaf blower was a 2-stroke.


Your first clue that your neighbor is an idiot is that he can't tell that it's a 2 stroke just by listening to it. Smile, thank him, and go on about your business.


Do they even make leaf blowers or other hand held equipment like chain saws with 4 stroke engines? Seems they would be too heavy.

Re: Part Throttle bad for 2-strokes? [Re: 92saturnsl2] #5169465 07/24/19 06:04 AM
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atikovi Offline
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Was at the Import Festival this May in Carlisle Pa and overheard the owner of a Trabant (2 stroke) saying how he avoids long downhill roads without stepping on the gas frequently to help lube the engine.

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