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Posted on Jan 02, 2017
Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside
Posted on Nov 16, 2009
I took the carb off (easy- two screws), rebuilt and cleaned it, removed the black "H" & "L" needle jet screws (with no screwdriver slots) with a tiny pair of needle nose pliars, 1/8 turn at a time. They are very tight. Then I cut the slots with a fine hacksaw blade and re-installed them. BEFORE you begin, MARK where the "pointer" notch is on each screw so that you know where to reset them and count the turns coming out. Also, cutting the slot 90 degrees off of the pointer mark helps.
An option would be to hold the carb body in a vise and cut the screw slots thru the aluminum guard. Be very gentle, the screws are soft steel. If I had to do it again, that's what I'd do.
Get it running and adjust the "L" at idle until it runs smooth as rich (open) as it can. Then hold the throttle wide open and open the "H" (high speed needle jet) until it runs smooth, as rich as possible. This can be a CHORE.
Remember, richer (more fuel) is better than too lean. Too lean means less lubrication and running much hotter. 80% of the cooling in gasoline engines is from the evaporative effect of the charge coming into the engine. That's why carbs ice-up well above freezing. Ask any pilot.
Posted on Jan 01, 2010
could be two things from description the first is the carb needs a clean out and the second is the metal flap behind the engine cowl has corroded awy reducing its size ,most likely is the carb though as its one of them funny ones designed to work at any angle like a chain saw.So firstly try cleaning the carb out and see what happens ,these always get choked up when not used regular as when put away teh carb isnt drained so petrol evaporates leaving a fine white coating which can and does block the jets up
Posted on Oct 24, 2010
SOURCE: Blower not running at high
Try removing the muffler and look inside of the exaust port, you should be able to see the piston in the full opening of the port. If you can, try starting and running at wide open throttle. If it runs fine( a bit loud, so wear hering protection), then you have a plugged or partialy blocked muffler or spark arestor. Sometimes rich mixture can cause excessive carbon build up.
Hope this was helpfull.
Posted on Nov 07, 2010
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