357xp problems

[Pasty Muncher]

I've today started using my saw after resting it's a while (3 months, a brief use then another 6 week rest). Drained old fuel and filled up with fresh and it's started and range fine. As the day has gone by it's has got slower and slower on pick-up and cut out when idling. Now will only start on choke and won't tickover at all. Air filter is clean, new spark plug fitted and new fuel filter fitted (the old one was yellowy browny). Seems like a blocked L jet to me. Any other suggestions?

 

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[Stubby]

I've today started using my saw after resting it's a while (3 months, a brief use then another 6 week rest). Drained old fuel and filled up with fresh and it's started and range fine. As the day has gone by it's has got slower and slower on pick-up and cut out when idling. Now will only start on choke and won't tickover at all. Air filter is clean, new spark plug fitted and new fuel filter fitted (the old one was yellowy browny). Seems like a blocked L jet to me. Any other suggestions?

 

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Sounds as though you might be on it with a carb kit/clean . Spud will be on sometime he will point you in the right direction >

[Pasty Muncher]

That's what I was thinking, stale fuel gumming up the carb. Not sure why it was running fine earlier but not now though.

 

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[spudulike]

Sounds like the carb has ingested some fine dust, you will need to remove the carb, take off the cover that is held on by one screw - it is a casting not the pressed steel one. There will be a gauze filter around the diameter of a fat pencil and there may be some crud in it - this is the most likely cause.

 

If the fuel line has been sat in petrol a long time, it may have gone soft - try squeezing it and if it is really soft, it may need changing.

 

Other than that, when it is running slow, undo the fuel cap and see if the saw jumps back to life - if it does the fuel tank breather/vent is blocked and needs cleaning.

 

Is the plug a good colour - like coffee colour in the middle?

 

It would be worth quickly looking at the piston through the exhaust port by removing the muffler - if it has vertical scoring, it is bad news.

 

I am a bit of a specialist on 346XP/357XPs so if you are stuck......

[spudulike]

Forgot to ask - is it the EPA model with the auto decomp valve?

[Pasty Muncher]

Thanks for all suggestions. When I changed the fuel filter I failed to notice that the fuel line was soft, but now you've mentioned it......

It isn't the auto decomp model, but is different to the other 357xp on site in that the low mix screw is a plastic thingy which goes about half a turn lock to lock. Will probably have to put it in somewhere as I'm "in the field" and need it back asap. I'll let you know what they find.

Thanks again

Rob

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[spudulike]

Thanks for all suggestions. When I changed the fuel filter I failed to notice that the fuel line was soft, but now you've mentioned it......

It isn't the auto decomp model, but is different to the other 357xp on site in that the low mix screw is a plastic thingy which goes about half a turn lock to lock. Will probably have to put it in somewhere as I'm "in the field" and need it back asap. I'll let you know what they find.

Thanks again

Rob

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The "Plastic Thingy" is a carb limit cap and is to stop the uninitiated frying their saws:001_rolleyes:

 

The other 357 probably has had them removed - usually the first thing I do but that is my choice!

[Pasty Muncher]

The "Plastic Thingy" is a carb limit cap and is to stop the uninitiated frying their saws:001_rolleyes:

 

The other 357 probably has had them removed - usually the first thing I do but that is my choice!

 

I assume then that if I can't adjust it up within the limits of the limit cap that the problems is not a simple tweaking of the carb, and as I'm in the field a strip down of the carb myself would be unwise, especially as I'm not familiar with the job and have no spares beyond filters and plug

 

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[spudulike]

I assume then that if I can't adjust it up within the limits of the limit cap that the problems is not a simple tweaking of the carb, and as I'm in the field a strip down of the carb myself would be unwise, especially as I'm not familiar with the job and have no spares beyond filters and plug

 

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If the limit caps have been set correctly and the saw has run perfectly with the current adjustment then the issue is most likely elswhere. I wouldnt strip the carb anywhere but on the bench - too many small parts!

[Pasty Muncher]

I am a bit of a specialist on 346XP/357XPs so if you are stuck......

 

PM sent!

 

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