Have a 1990s tecumseh hssk50. this engine is off a snowblower, and is in very nice condition. the bore is scratch-free, original hone marks still visible. it's a small exhaust valve version. i can not get this engine to fire! here's what i've done/checked...
- pulled the piston, ring gap on top ring down about 1" from top of cylinder is .015". the three rings are properly spaced apart.
- cam/crankshaft alignment gear teeth set correctly
- lapped the valves.
- checked the valve clearance and both at .006"
- no governor, i removed it.
- checked the head for flat surface with blue ink, and it's pretty darn flat.
- new head gasket.
- new spark plug.
- currently bolted to my workbench with no exhaust or intake/carb.
using starting fluid through the spark plug hole, i can't get even so much as a sputter from the engine.
(I'm using a drill to turn the motor, and yes i'm spinning it in the correct direction! ha!)
yes there is spark, and it's robust. but for fun i replaced the flywheel and CDI unit from another engine, no change.
compression is nice too, you can feel it.
now i know this motor ran before, as there was some carbon in the head. not much though, this engine was not run much. the exterior case was pretty clean too. a very lightly used engine. but it sure won't even do as much as a sputter now. even if the compression is low i should get a sputter from the thing...
what am i missing??
thanks!
- pulled the piston, ring gap on top ring down about 1" from top of cylinder is .015". the three rings are properly spaced apart.
- cam/crankshaft alignment gear teeth set correctly
- lapped the valves.
- checked the valve clearance and both at .006"
- no governor, i removed it.
- checked the head for flat surface with blue ink, and it's pretty darn flat.
- new head gasket.
- new spark plug.
- currently bolted to my workbench with no exhaust or intake/carb.
using starting fluid through the spark plug hole, i can't get even so much as a sputter from the engine.
(I'm using a drill to turn the motor, and yes i'm spinning it in the correct direction! ha!)
yes there is spark, and it's robust. but for fun i replaced the flywheel and CDI unit from another engine, no change.
compression is nice too, you can feel it.
now i know this motor ran before, as there was some carbon in the head. not much though, this engine was not run much. the exterior case was pretty clean too. a very lightly used engine. but it sure won't even do as much as a sputter now. even if the compression is low i should get a sputter from the thing...
what am i missing??
thanks!