RCU Forums - stihl engine quits

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AAis4ne

01-24-2009 12:47 AM

stihl engine quits

I have been following the convrsion method to a T. I am trying to get a stihl 020 chainsaw engine on gas glow. The problem im having is that when I disconnect the lighter the engine quiits almost instantly. While on the lighter runs nicely. Could I have it still a little to rich which is putting out the plug? Ive got a 15-6 MAS prop on it and it seems very powerful cant wait to get it on my boat :D I was looking at this website http://www.scootworks.com/rdrc/gloplugs.html and was wondering if I should be using an OS #8 plug instead of the "F" plug. or do we always use a 4 stroke plug even on 2 cycles?

JohnF

01-24-2009 08:34 AM

RE: stihl engine quits

I am using an OS A3 on my B&S 40cc, 4-stroke. Do need to keep it hot in my case. Make sure the plug sits as deep in the head as possible without hitting the piston of course.

microsprint9

01-24-2009 09:14 AM

RE: stihl engine quits

Usually if it quits soon as he power is removed from the plug then the plug is bad, are you using the 1 part glow fuel mixed with 2 parts premium gasoline?

AAis4ne

01-24-2009 10:56 AM

RE: stihl engine quits

yes the fuel has been measured out and is correct. I'll do some more testing today to see if letting it warm up longer is the answer it has been cold here lately(in the negatives).

captinjohn

01-24-2009 07:41 PM

RE: stihl engine quits

Quote:

ORIGINAL: AAis4ne

yes the fuel has been measured out and is correct. I'll do some more testing today to see if letting it warm up longer is the answer it has been cold here lately(in the negatives).

I have used a sock that was wore out in the heel area and cut and used the top part to slip over head & cyl in cold weather in Michigan and the engine will warm up good doing that. Give it a try!!! Capt,n Florida Now!

microsprint9

01-25-2009 10:34 AM

RE: stihl engine quits

Well it's cold here in london too as you are not too far away from me, we were running gas/glow engines in -12 temps the other day with no problem, all i can tell you if it works with the ignitor on but doesn't when you take it off is either there is not enough methanol in your fuel ( but you said you mixed properly ) or you have a bad plug, if this is a fresh conversion remember that there is usually lots of crud in these engines from prevoius use that can ruin a glow plug, it took me 2 plugs in my 21cc before it ran problem free.

captinjohn

01-26-2009 05:46 PM

RE: stihl engine quits

Quote:

ORIGINAL: microsprint9

Well it's cold here in london too as you are not too far away from me, we were running gas/glow engines in -12 temps the other day with no problem, all i can tell you if it works with the ignitor on but doesn't when you take it off is either there is not enough methanol in your fuel ( but you said you mixed properly ) or you have a bad plug, if this is a fresh conversion remember that there is usually lots of crud in these engines from prevoius use that can ruin a glow plug, it took me 2 plugs in my 21cc before it ran problem free.

Micro....I think you hit the nail on the head. A good Glow plug is needed for sure. Best Regards Capt,n

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