Tecumseh 10 HP, no spark!

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  #1  
Old 02-10-10, 07:03 AM
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Tecumseh 10 HP, no spark!

Short version....had blown 8 hp Tec. for snowblower (HMSK80-155693X). Got 10hp Tecumseh new short-block (LH358XA-159493Y), swapped out crank and cam shaft (needed the pto shaft from blown engine to drive snowblower wheels) and both are solid state ignition. Everything came together like a dream, the blocks are identicle save for slightly larger piston. I have good compression, but no spark!. Checked spark plug in spare snowblower, works fine. Have SSI so ordered new one thinking coil was bad, still no spark.
I am using old flywheel also, but as long as magnets line-up with the solid state ignition, shouldn't I get a spark (gapped to 0.012) if SSI is functional?
Do I need to use the 10 hp's original flywheel for some reason? No grounding issue that I can see (only using spark plug boot to spark plug).

What do ya think?
Thanks in advance!
 
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Old 02-10-10, 08:05 AM
Join Date: Jan 2007
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10HP flywheel, not the same as 8HP different PN#,
 
  #3  
Old 02-10-10, 08:52 AM
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Thats what I was thinking...but shouldn't any magnets from pretty much any fly wheel cause the ssi to fire if gapped right?
 
  #4  
Old 02-10-10, 09:45 AM
Join Date: Jan 2007
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Look at where the keyway is in relation to the magnets, most likely different and this would effect timing
 
  #5  
Old 02-11-10, 08:25 AM
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Make sure the air gap between the coil & the magnets is .08~.10 inch & the coil is mounted with the correct side toward the engine... I'm thinking as long as the magnets spin past the coil, you should get spark,, but I don't know what the differance in the 2 flywheels.... Roger
 
  #6  
Old 02-11-10, 09:30 AM
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Thanks....you have helped alot. I wont tell you how stupid I feel with the mistake I made, well anyway, I was not using the solid state ignition "stand-off" posts, so the coil was not over the magnets properly. Somehow I missed transfering these from old to new engine!
The posts push the ssi out over the flywheel far enough now...have a spark! Engine started 1st pull (now it vibrates excessively, but thats for another day).

Thanks again....
 
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