JR50 not running right

[cheese]

I went to take my son for a spin on his 50 yesterday and it went like shit. It would only run with the choke on and only on full throttle.

I got it second hand and it had sat in a garage for 15 years, so maybe a piston? thought you'd never do one in one of those... Jets are all clear, but I'll take the carb to work to clear it with the air compressor to be sure.

Any other thoughts?

[noobi]

Iv seen a JR50 piston and bore that was scored to buggery, had the cylinder bored out .5mm, put an oversize piston in, including gaskets was ~$230.
Otherwise it sounds like blocked jets somewhere. Not getting fuel so it needs the choke on all the time to richen what is getting through, and WOT is basically directly out of the float bowl so hard to block that.

[Jinxycat]

I went to take my son for a spin on his 50 yesterday and it went like shit. It would only run with the choke on and only on full throttle.

I got it second hand and it had sat in a garage for 15 years, so maybe a piston? thought you'd never do one in one of those... Jets are all clear, but I'll take the carb to work to clear it with the air compressor to be sure.

Any other thoughts?

only full throttle could be only on the main jet, pilot blocked,
also only with choke usually means lean but you probably figured that
i have seen them run in all sort of condition, got to be quite major not to run, they even run with f all compression and bags of piston slap

[barty5]

our pw50 use to run but not the well was a little gut less new piston and rings and the thing is a whole new bike real quick (for what it is ) only prob i now have is needs new throttle cable its sorta stuck on full not the best for little kids.

[scott411]

i would clean out the carb first and check the air filter is ok,

if this does not help, then take of barrell off to have a look,

[B0000M]

checked manifold-cylinder gasket or boot or whatever is there for leaks?

wot & choke on a symptom of an air leak

[Brian d marge]

checked manifold-cylinder gasket or boot or whatever is there for leaks?

wot & choke on a symptom of an air leak

what he said , u can use brake clean to find the leak( engine note will change),,,, please don't launch yourself over the neighbors fence

Stephen

[B0000M]

what he said , u can use brake clean to find the leak( engine note will change),,,, please don't launch yourself over the neighbors fence

Stephen

i just read what i wrote yesterday... it almost looks like a barty post!