I'm new to the forum. I've owned a Lawn boy a number of years but do not understand what is the difference between a L-series engine and an F-series engine? I have a L21ZPND not sure if this is the model # or not. My lawn boy quit yesterday while mowing. Replace the ignition module and it ran for a little while and quit again. Took off the muffler and looked in the exhaust ports saw the piston had a lot of scratches on it. Anyway getting ready to tear it apart have done so quite awhile back to clean the carbon off the piston head. Like I said before I've had a lawn boy a long time and want to rebuilt this one. I really like the two stroke. Any help would be appreciated. I tried do a search on the L series motor on this web site to no avail. What terms do I need to put in to get a response on a rebuild, thanks.
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