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Toffer
Joined: 01 Nov 2009
Posts: 84
Location: Greenwich (ish)
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 Posted: Sat Nov 07, 09 2:56 pm Post subject: Chainsaw repair |
 
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A little help required.. I picked up an old US model Homelite chainsaw a few years ago, it never ran that well although I have had it running long enough to chop a few logs, I have been trying to tune it up but now can't get it started at all. I think there's spark and fuel (replaced the old line and grommets) but not sure where next to turn and have a very tired starting arm. Any advice?
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RichardW
Joined: 24 Aug 2006
Posts: 5703
Location: Llyn Peninsular North Wales
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| Posted: Sat Nov 07, 09 3:01 pm Post subject: |
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When you say "I think there's a spark & fuel" does that mean you have actually checked?
Before going any further pull the plug out & check you have a nice big fat bright spark. Then check you have a petrol smell in the cylinder (you might find the plug is wet from all the trying any way). Dry the plug if it is wet (heat not a towel).
Then check spark.
Set the gap.
Is the fuel fresh & does it have the correct mixture (measured not glugged).
Put a finger over the plug hole & pull the starter to check compression, it should push your finger away & let the air out under pressure no matter how hard you press. |
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Toffer
Joined: 01 Nov 2009
Posts: 84
Location: Greenwich (ish)
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| Posted: Sat Nov 07, 09 3:43 pm Post subject: |
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Thanks for the info, I'll check those points and let you know what the results are, probably in the morning now, my cord pulling arm has had enough for one day. |
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Hairyloon
Joined: 20 Nov 2008
Posts: 2032
Location: Today I are mostly being in Sheffield.
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| Posted: Sat Nov 07, 09 3:51 pm Post subject: Re: Chainsaw repair |
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| Toffer wrote: |
| I have been trying to tune it up but now can't get it started at all. |
You may have adjusted the mixture too far.
Wind the mixture screws right in, then open then (damn, I've forgotten) 1/2 turn (or is it 1 1/2? Might even be 1/4. Sorry). |
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Wherry
Joined: 12 Oct 2009
Posts: 42
Location: Suffolk
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| Posted: Sat Nov 07, 09 4:00 pm Post subject: |
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Most simple carbs have an air screw to alter the mixture and mostly they work in the range 1 1/2 turns out from fully in +/- 1/2 a turn.
Most common problem with a 2-stroke engine is the spark plugs can just give up for no apparent reason and you'll not be able to clean it and make it work. Buy a new one.
The other thing is that modern unleaded petrol goes off after a few months so get yourself some fresh petrol and mix it fresh with your oil and then have a go with the new plug. |
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Hairyloon
Joined: 20 Nov 2008
Posts: 2032
Location: Today I are mostly being in Sheffield.
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| Posted: Sat Nov 07, 09 4:33 pm Post subject: |
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| Wherry wrote: |
| Most simple carbs have an air screw to alter the mixture and mostly they work in the range 1 1/2 turns out from fully in +/- 1/2 a turn. |
Most chainsaws have two.
If you were tuning it, then it stopped working, then I'd hazard that is the most likely explanation, unless you've run out of fuel. |
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Toffer
Joined: 01 Nov 2009
Posts: 84
Location: Greenwich (ish)
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| Posted: Sun Nov 08, 09 1:24 pm Post subject: |
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Have now checked a few of the things mentioned, there is a spark and compression seems OK, not sure about the fuel though, there's no smell from the cylinder so off to get some more two stroke oil and petrol to try filling with fresh, may get a new spark plug while I'm at it as the current one is ancient. Will be back asking for more advice once that's done, I'm sure. |
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RichardW
Joined: 24 Aug 2006
Posts: 5703
Location: Llyn Peninsular North Wales
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| Posted: Sun Nov 08, 09 2:16 pm Post subject: |
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No fuel =
empty
tank pipe fell off
pipe or filter blockage
carb blockage
mixture screw all the way in
lack of crankcase pressure / vacume |
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