but if i clean the plug. and turn it over without plug in a couple of times i can install the plug and will start and run for a sec then just floods and cuts off maybe a back fire every now and then. maybe the carb still. idk.

 

How do i perform a leak down test? to see if crank seals/bearings are bad?

 

How do i perform a leak down test? to see if crank seals/bearings are bad?

 

you need a special gauge set..i made one myself but in essence you block off the intake and exhuast manifolds air tight. then you pressurize the cylinder to 100psi. and you watch for how much is lost. should not be more than 15% but 10% is optimal. you can also listen to air leaks to see where the leaks are at.

i really think its the seals/bearings. to see easily if it is the bearings take the flywheel housing off and grab the flywheel and wiggle it up and down and side to side. if it has movement then the bearings are on their way out. a seal can not keep up with a shaft that is spinning 1000rpms and its out of round

 

have you tried a new spark plug? sometimes they get to where a nice spark will show out of the head but when you add compression to it, it just shorts out and never sparks.

 

not yet but ill try a new plug. maybe that might do it. what is the correct plug? it has a NGK in it now not sure of the number. im at work and can get one on the way home. Thanks and ill let u know how it comes out.

 

its a NGK BR8ES gapped at .028 - .031

 

I put the new plug in and seems to be running great. how does the choke come out of the carb for cleaning? not real sure how its connected at the carb.

 

normally it is just screwed into the top of the carb but im not completely sure. you could try looking at a parts diagram to get an idea of what is supposed to be in there...

edit:
yep i just looked at the diagram.. there is a 12mm hex where the choke cable goes into the carb, just loosen that and it will let you pull a plunger out. when you put it back together, there should be 1/8" of free play at the choke lever

 

i loosened the cable and see the spring but it does not want to come out. it has to be connected somewhere inside the carb body or is just stuck. i dont want to pull to hard im afraid of breaking it.