Lawn-Boy will not start problem

[denwayanderson]

Hello all,

I have a lawn boy push mower that will not start. I have changed out the cd pack and cleaned the carburetor inside and outside. I recently had a plug that was too long and I think it hit the piston, however, there does not seem to be any damage to the piston head as observed from the spark plug hole.

Any suggestions would be appreciated.

 

[reynoldston]

It needs spark, fuel, compression, and timeing and it will run.

 

[denwayanderson]

thanks for the reply. I have spark, compression and I think the timing is good without tearing into the engine.

a while back a long shank spark plug was installed and was incorrect since a short shank is required. what this did was hit the top of the piston. I check from the outside spark plug hole and looked for damage on piston and looks good and I can hear compression.

I will open the carburetor and clean out again because looks like the carburetor is not receiving much gas i found out today. I will check again if I installed the fuel jet correctly below the float.

thanks for your help.

Dennis

 

[noma]

Hay Denwayanderson


Another thing you could try is pouring a little fuel right into the carburettor and try to start it , see if it run for a little while with the gas you poured directly into carburettor. Then try pouring gas in once and a while to keep it running a little bit, that might help determine carburettor problems . Just a idea good luck.:smile:

 

[reynoldston]

The only good way to check compression is with a gauge. You might have a tight valve which would give you compression but not enough to run the engine. You might be able to rent one from a auto zone. I know no one likes starting fluid. I don't know why because I use it all the time and never have a problem with it. The starting fluid of today has a lub. in it so it doesn't hurt your engine. I say spray some starting fluid in the carburetor and see if it runs this will tell you if it is a fuel problem or not. Timing would most likely be a flywheel key which would be off if the engine stopped fast like if you hit something or maybe the plug hitting the piston. Spark get a spark tester from a auto parts store because the spark should be tested with the plug in the engine. A plug may fire out of the engine but not under compression. The spark tester is less then 5 dollars money well spent.

 

[denwayanderson]

has anyone had trouble removing the under the deck muffler. I have taken the blade and nut, however, the muclhcing flange does not seem to move. is there a clip holding the flange to the cranshaft?

any help appredciaed as always

Dennis

 

[Briana]

I moved your thread to the Small Engine & Mower Repair Forum. :smile:

 

[denwayanderson]

ok thank you

Dennis

 

[jeff]

Since you have an underdeck muffler,your mower is likely a two cycle. Do you mix oil with the gas? A lot of those older lawnboy's had a fuel shut off if it has one, take off the fuel line at the carb and turn on the fuel. If you get no flow or little flow the fuel shutoff may need to be rebuilt. Kits are available.

 

[denwayanderson]

Hello all,

I have checked the carburetor, rebuilt it, poured gas mixture in the carburetor port to the cylilnder, I have spark tested, the piston moves, cleaned the muffler, the timing seems good since the piston does move with the turn of the crankshaft, however, I noticed a small imprint on the top of the piston in the cylinder as viewed from the spark plug port, i think this was caused by a long shank spark plug but there does not seem to be any hole of any kind. The mower still will not crank.

any suggestions left to do please let me know

Thanks evereyone for the input.

Dennis