Hello,
I have an older Snapper 48" walk behind with a Kohler cv15t engine (single cylinder). It starts fine, idles but when I raise the RPMs to mid way or higher it misses and backfires. It did not do this when I owned for the first couple years I owned it.
I've replaced the carb (and just cleaned it again), ignition module / coil (set the gap to .010 - .012), plug (gapped to .035), fuel line, fuel filter. Yesterday, while it was doing it I sprayed starter fluid (while running) into the carb inlet and it kept on doing it or got worse. Made me think a spark issue but like I said the coil, wire and plug are all new and there really aren't any other components on the electrical side. I did order an inline spark tester where you can see the spark and I will compare with other engines I have. Is there a way to quantify the coil, spark ignition system (multimeter, otherwise)?
I will also go ahead and replace the vacuum line between the OHV and the carb inlet (likes like it has small cracks) but I don't think that's the problem. My other thoughts now are timing, maybe compression (but seems like has good compression when pulling starter cord). For timing, the lifters look like they come right off the cam and up into the head (no chain etc.), and the ignition side the ignition coil meets with the flywheel magnet so I'm not sure how these could be too far off but I suppose something could be worn etc.
Just tired of playing with it with mowing season coming. Would rather be sitting with the wife and a glass of wine than cussing out in the driveway.
Any thoughts, thanks Mike.
I have an older Snapper 48" walk behind with a Kohler cv15t engine (single cylinder). It starts fine, idles but when I raise the RPMs to mid way or higher it misses and backfires. It did not do this when I owned for the first couple years I owned it.
I've replaced the carb (and just cleaned it again), ignition module / coil (set the gap to .010 - .012), plug (gapped to .035), fuel line, fuel filter. Yesterday, while it was doing it I sprayed starter fluid (while running) into the carb inlet and it kept on doing it or got worse. Made me think a spark issue but like I said the coil, wire and plug are all new and there really aren't any other components on the electrical side. I did order an inline spark tester where you can see the spark and I will compare with other engines I have. Is there a way to quantify the coil, spark ignition system (multimeter, otherwise)?
I will also go ahead and replace the vacuum line between the OHV and the carb inlet (likes like it has small cracks) but I don't think that's the problem. My other thoughts now are timing, maybe compression (but seems like has good compression when pulling starter cord). For timing, the lifters look like they come right off the cam and up into the head (no chain etc.), and the ignition side the ignition coil meets with the flywheel magnet so I'm not sure how these could be too far off but I suppose something could be worn etc.
Just tired of playing with it with mowing season coming. Would rather be sitting with the wife and a glass of wine than cussing out in the driveway.
Any thoughts, thanks Mike.