You most likely need to set your valve clearances. If it is hard to pull over or the recoil snaps back after starting your valves need to be set for sure. This may not be the entire problem but it is a good start. Also change the spark plug, a bad plug will cause odd problems and is too cheap not to eliminate as a source. In addition check your fuel, pour a little out into a white container (I like spray paint can caps for this) and look at the color. If it is yellow to orange it is bad. You can pour it into you car, the car electronic sensors will compinsate for it quality but a small engine can't. Use a NGK BP6ES or BPR6ES plug.
You need:
Feeler gages
10mm open end wrench
14mm open end wrench
1 long shaft screw driver or rod
1 spark plug socket and ratchet
Remove the spark plug and the valve cover. Pull the recoil over slowly until the intake valve opens (intake is closes to the carb and it will go down when it opens). Now put your long screwdrive down the spark plug hole. Slow pull the engine over until the screwdriver handle is at it highest point, this is top dead center. It may take a few attempts. Now check your valve clearance between the rockers and the top of the valve. The intake should be .006 and the exhaust .008, both can be +/- .001. To adjust: hold the large nut with the 14mm then loosen the small one with the 10mm. Lefty loosey. Now turn your large nut until you get the correct setting and then tighten the small one the lock it in. It may take a few attempts and alway reverify your setting after you lock it down. Once done, find top dead center again and reverify. Now your valves are set.
Wow! Ok, the only thing I can think of is that some dirt in the fuel system got into your new carb. Try removing the carb and cleaning it. The portion that is in question is the center orifice. Where the fuel bowl bolts on there is a long shaft. You need a thin bladed screwdriver to remove the center orifice (lefty loosey). Once you get the screw portion of the orifice out, tap the carb gently on a hard surface. There will be a long brass portion that will come out. Clean out all the holes (I use a set of tip cleaners for torch tips to do this). Look through the holes with a bright light or the sun behind it and you should see through all holes. For good measure spray a bit of carb cleaner through all of it. Reassemble.
In rare cases I just stuck a piece of foam in the carb intake to keep it running normally. Usually on larger engines or very old engines are the only time I did this.
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The valves need to be cleaned
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Thank you I did all of what was posted but still has to have choke halfway on to run,did not check compression with gauge but seems to be up. When engine is running it does not smoke at all, Just when you kick choke off it just dies. Have cleaned fuel tank,new filter and carb.(NIGHTMARE) Someone wants to rebuild the engine he thinks it will solve the problem.( I don`t think it will)???????????? Thanks TheBoss
Thanks again if I ever get the thing fixed I will post what the heck the problem was. Thanks again. TheBoss
I finally
I did not check the gasket because I thought it had never been apart before but it turned out it had, the gasket was staying on the motor when I removed carb. so you think nothing or it right as long as it`s in good shape. Well it was on backwards problem solved.
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