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You may have a scored barrel and piston. Had very similar issues with my sthil hedge cutter. The chamber was getting fuel ok but it was disapearing down the scores in the pot, thus starving the chamber of fuel so it lost power and cut out when i tried to get it up the rev range. New pot and piston kit solved the problem. Running it at tickover really wont tell you anything as its not reving hard enough to get the engine really warmed up and expand the pot and piston which in turn exposes the scores down the barrel more and allows the unspent fuel to be thrown out the exhaust ports still in its liquid form. Have a check of the exhaust and if its "oily" then it may be this thats the cause.
At least that what the local repair shop told me !!.
Pretty much have just had the same thing with my Stihl ms230 chainsaw, won't rev at full pelt without cutting out, it was due to bad scoring on the barrel and piston due to overheating.
May be a simplerand cheaper solution - First check the exhaust. Had this problem in the past with exhaust getting coked up. On full revs I've seen a 'ball' of soot block the exit hol of exhaust.
Or maybe;
Stale fuel ?
Fuel filter ?
Vacuuming tank ?
Collapsing fuel line ?
Is there a clogged up spark arrestor in the exhaust ?
Air filter, faulty choke lever ?
More than likely its the carb. Some carbs are screwed no matter what you do to them and need to be replaced. They have two fuel circuits, idle and run. It could be that the run circuit is faulty so not letting you rev it. The jets have double check valves in them so cleaning gets mixed results. Or if fitted it could be the high, low adjusting screws need a tweak.
P.S. You shouldn't really leave 2 strokes idling for long periods of time as they don't 'like' it.
P.P.S. I'm off to get a life now anyway so let us know how you got on.
air filter or exhaust bunged up take it off and heat it up with a blow lamp and tap the bits out (thats the exhaust)
Any dirt in the fuel tank will quickly block the fuel intake. As mentioned, a coked-up exhaust will have the same effect. One of my Stihl engines (a Canadian-spec for some reason) had a very fine spark filter fitted that caused this so check for a mesh inside the exhaust. Obviously check the air filter, they do clog up with dirt and oil.
If it's a machine that's seen a lot of use, it might just be worth replacing it. I've tried repairing before, but if it's had a lot of hours use you'll be replacing one bit only to find a cable or starter mechanism breaks just when you need it most.
Im going to clean out the exhaust this afternoon and replace the filters. what am i looking for for a scored piston? If this is the case do I just order a spare abd pop it in? Fun times learning though.
Update for the record if this happens to anyone else - It was a combination of all of these (hence the improvement after carb clean) But with a lot of surface crap in the muffler (I had to pay for it to be cleaned as I wasn't sure how).
Now runs a dream -
Moral of the story - Keep your tools clean:)
I have submerged the exhaust in caustic soda on several occasions - seems to do the trick.
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