Can't figure it out

[coolted]

I have a 1996 Silver seried Lawn Boy. model 10227. Has good compression, new plug, good A/F,, thoroughly cleaned carb, new float and needle valve, I even sanded the rust off of the coil. New seals and reed. This thing will start on the first pull, will run right up to high idle, but it sounds like it's only hitting on every other stroke. It is a compleetely even miss, not random like some other 2 cycles. It will smooth out under a rather heavy load. I don't want to give up on it...what do you think? I don't know what else to do. The only thing I can come up with is to mess around with the float level, but that's a lot of work for troubleguessing...

BTW... new here, nice to meet you.

 

[Rocket_boy]

I would say you need to dig into the carb a bit and make sure all is in spec, if it isn't that could be the problem. I would also check for any exhaust obstructions and clean the ports. If possible borrow a coil from a perfectly running example. Coils can be flaky sometimes and cause many different problems.

Only two things that really bug a Lawn-Boy,....carb and ignition.

 

[Two-Stroke]

Hey, coolted, it's good to have you here in the Lawn-Boy forum.

I see that you have three Lawn-Boys so maybe my suggestions about your problem will be a little too basic but I'll try anyway.

Are you sure that the engine is fully warmed up? It can take a while in cooler weather.

Could there be anything wrong with the fuel? If the mower hasn't been used for more than a month there could be some stale fuel at the bottom of the tank. Likewise, could there be any obstruction to the fuel flow?

Here's a topic I don't really understand myself. :ashamed: On these newer (1990s and later, I think) mowers, the coil can be somewhat bad while the engine can still run. This came up in another thread in the LB forum -- but I can't remember which thread.

You obviously took the engine apart to replace seals, reeds, etc. If all of the above hasn't helped, take it apart again and check carefully that the crankcase is fully sealed. Check the plate that the reeds attach to -- it has to seal very well onto the crankcase. Keep in mind that, when the piston goes down, it's necessary to have a good seal in the crankcase so that the fuel/air mixture will get pressurized and shoot up into the combustion chamber.

If you get a chance, post some photos of your Lawn-Boys. :thumbsup:

 

[coolted]

After dong some reading, about the only thing left is the coil. I just learned that these can run with a bad coil. BTW...Just acquired a running 1979 and a Gold series easy stride 6.5 (2-cycle)....for $40. Thanks for the reply...I'm going to try a coil, that seems to make sense to me after learning they have 2 stages.

-edit....the plate on the reed. Now that I hadn't thought of....

 

[Two-Stroke]

How's it going, coolted? Did you try a different coil?

It occurred to me that you're near the mother-lode of Lawn-Boy heaven up there in Nebraska. :biggrin:

Have you checked out any of the threads by hankthecrank (HTC)? He's also from Nebraska and has the best LB collection I've seen.