64 - Prior to carb rebuild, let the whole thing soak in the ultrasonic cleaner for multiple rounds and got it spit shinny clean. - Replaced crank seal - Ground down valve stems (before less than .002 in), now both .008in. Specs call out .012in for the exhaust. I thought the exhaust valve would solved this problem because it appeared it was not seating flush so I lapped that valve as well as the intake. After inspecting the faces of both valves, it would appear they were contacting the valve seat evenly. I was so sure this would have done the trick but now I am back to square 1 - Replaced head gasket, Torqued to specs. This is some additional information which might help. On a high rev (no load) you can hear the engine skipping. At a lower rev or idle (no load), it tends to skip a bit more. Once you put a load on the engine the skip doesn't go away completely but is noticeably less frequent to almost not at all. As soon as the load is off, it begins skipping again. I did spray for carb leaks with carb cleaner but that didn't turn up anything. Oh, not sure if this is related but when I move the throttle from high speed to idle, it is not instant. I am now leaning toward the possibility of week valve springs. Any ideas ? Dan
Garden - Tecumseh - 5hp Engine Snow King Mtd Blowers Lh195sp67517
Answers & Comments
Have you had your coil tested and set the air gap between the flywheel and coil correctly? Also check the flywheel key for even the slightest damage. This can throw off the timing.
Terry
Try changing your carb jets,it sonds to me that they maybe old and worn or even just blocked
Thanks for the reply supermootch. Maybe I am wrong but, I was not aware these small carbs could be rejetted. The rebuild kit contains the float bowl gasket, float bowl nut whch has the idle metering screw, the main jet metering screw with the washer and the bowl valve with the new bowl valve seat. No jet included.
You may be on the right track with the carb issue though. The variance on the main jet and the idle just appear to be a bit wide. If I turn out either screw about 4-5 turns in the perspective modes, the engine should stall and it doesn't at times.
I had put this carb through its paces with the ultrasonic cleaner, and blew out all the orifices with forces air and sealed the welch plug with gasket sealer just incase. I did all the stuff I was supposed to do ....... that is why I am frustrasted with this now. It should be running like a champ and it is not.
Fixya is not very clear on how to start a new session so I ended up under the heading for the 5 HP Tecumseh where the engine I am currently working on is a 9HP.