Priming a small 2 s...
 

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[Closed] Priming a small 2 stroke engine which doesn't have a primer. (Chainsaw content.)

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I have a STIHL MS 170. When convenient, I run it out of petrol at the end of use in case it's stored for a while. I don't want the carb to get gunked up with stale fuel. [1]

If I leave it with fuel in it starts easily next time I use it. If I leave it without fuel it takes an eternity. I assume this delay is because I'm using the pull cord to turn the engine/fuel pump and drag fuel down a fuel line to the carb and that takes time.

I'm fed up with this and want to find a way to prime it. Access to plug and air intake is convenient. Do I take the plug out and squirt some fuel direct in the cylinder in the hope it will run for a few seconds and drag fuel in? Could I spray some kind of easy start in the air intake, with the same hope. (I assume easy start is just something combustible?)

Any other ideas?

[1] I don't know why I do this since I've never had a carb gum up in this way, and I'm a serial offender at putting engines away half full of fuel for months at a time. Equally if I ever did have a problem I'd have thought cleaning the carb on a small chainsaw engine would a a doddle.


 
Posted : 20/10/2018 7:13 pm
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i alway give a blast of brake cleaner into the intake of a recalcitrant two stroke. that will get it going until the juice makes its was through.


 
Posted : 20/10/2018 7:48 pm
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If you store for ages - how much fuel do you actually get through ?

Because you could just run it on Aspen fuel and forget  worrying about it gumming up or going stale.

its expensive but reputedly does actually do what it says on the tin/can.


 
Posted : 20/10/2018 8:03 pm
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If you store for ages – how much fuel do you actually get through ? Because you could just run it on Aspen fuel and forget  worrying about it gumming up or going stale. its expensive but reputedly does actually do what it says on the tin/can.

What an incredible product. My usage level is minuscule interspersed with the odd big session so I can leave Aspen in 24/7 but when there's a big pile of wood to process I can mix up some normal fuel and run a couple of tanks of that through. Just make sure the last tank is Aspen again. I could make five litres last years. Also makes a petrol strimmer less hassle because I can use normal gas all summer and make the last two tanks Aspen before the winter layup. Thanks.

Still interested in people's thoughts on my OP.


 
Posted : 20/10/2018 8:37 pm
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I've used the sparkplug hole on mowers, but I wouldn't want to be doing it regularly because I just know that at some point I'll cross-thread the plug


 
Posted : 21/10/2018 7:05 am
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Mouth around the fuel filling cap and blow to push fuel through works for me. Only needed to do it a couple of times though.


 
Posted : 21/10/2018 9:07 pm
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Not come across this.

Choke, single fire, half choke, start, throttle. Even on the big Stihl 066 with a serious drinking habit this is fine from cold start.

New Husqys at work have a bubble pump and are a **** at tepid starts, no issues hot or cold.


 
Posted : 21/10/2018 11:26 pm
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Because you could just run it on Aspen fuel and forget  worrying about it gumming up or going stale.

This is all you need to know.


 
Posted : 22/10/2018 8:46 am

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