Export thread

serial# 7901784 you have to keep hitting the prime button before it dies after several times of hitting the prime bulb it will stay running. I've had the carb apart a few times, cleaned it well, used a compressor and blew out the lines in the carb. So far besides cleaning, i put on a new bulb and the 2 gaskets that goon either side of the carb plate.. I also cleaned the air filter. I was going to try new fuel next, this is my 90yr old uncles not sure how old the fuel is

Do that and problem will go away. Good luck.

Did you remove the main nozzle and jet when you did the carb cleaning. It is extremely difficult to clean all the openings with out removing first.

I did not remove it, I just blew air through it. im not sure how to remove it

Should unscrew.

I removed main nozzle and jet, not dirty but thorough cleaned, fuel filter screen tore so ordered a new one. Float, needle and seat seem ok.I put it back together and it does the same. it won't start unless primed 5 times. then keep punching the primer until it runs on its own. The primer bulb goes back really slow, and it is new. ( maybe part off the problem?) also when hitting the primer the fuel squirts straight up, IDK if this is normal, fuel seems to be getting into the air filter ( maybe because hitting the primer 5 times? )

Primer is acting as it should. From your description you have a lean starting condition. This is normally caused by one of two things. Either you have an air leak or the float level is set too low.

I wonder if a crankshaft seal would cause this?

tom3 said:

I wonder if a crankshaft seal would cause this?

Click to expand...

Yes it can. If there is a leak in the primary compression (crankcase) it can cause hard starting and poor running.

Rivets said:

Primer is acting as it should. From your description you have a lean starting condition. This is normally caused by one of two things. Either you have an air leak or the float level is set too low.

Click to expand...

Where would I check for air leaks? I replaced the gaskets between the carb and cylinder.

I’d start by checking the float level first. Did someone replace the carb with one that has the idle jet one the side of the carb? If so that could also be plugged, resulting in the same condition.

First thing to check is ALWAYS the fuel. Fuel goes stale in about 8 weeks now.

This is my uncles mower, all I have for 2 stroke oil is stihl hp ultra i use for my chainsaw , is it ok to use this with some fresh gas to see if that is the problem?

Yes, 2-stroke oil is 2-stroke oil. Modern Stihl oil is probably much better that the old petroleum based stuff from the 1980's he might be still using.

If there is one of those priming bulbs that you push to pump fuel to the carb, then make sure you pump it enough to flush out all the older fuel. Also check that the old fuel hasn't fouled the spark plug.