Question about McCulloch 16 Inch Gas Chain Saw MCC1635AK

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3200 MAC,I REBUILT THE CARB,WOULD ONLY RUN ON FULL CHOKE,I BOUGHT A NEW WALBRO CARB INSTALLED IT, STILL DOES THE SAME THING.IT SEEMS THERE IS AN AIR LEAK,OR STARVING FOR FUEL.

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Sounds ilke a ai leak the manifold block gasket may be leaking or a crack in the carb to barrel insulator- or it has a torn / perished intake boot or the impulse line is perished , could even be a loose barrel and the base gasket is leaking - or leaking crankcase seals

you have ruled out secondary compression and spark and blocked muffler

only proper way to know is to remove muffler and carb, block off both
inlet and exhaust with rubber gasket and a metal plate - make sure the inlet metal plate has a access hole for you to pressurise the c/case
remove clutch starter assy and flywheel
set to psiton to tdc and pressurise the c/case to 7 psi
brush around seals and gaskets with soapy water and see where bubbles are comming from that will be your leak it may be quite substanicial - check main seals, c/case joints, manifold block carb end and cylinder end and of course the manifold block itself

2 strokes need a air tight c/case to operate to fuel pump in the carb and to pump mixture from the crankcase to the cylinder

if sucking air instead of fuel they can be really hard to start, stall alot , have no power , will not idle , and seem to overspeed and get very hot
not to mention can damage tp piston and cylinder

have a look or let your local shop take a look for you

cheers

Posted on Aug 05, 2010

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