Thumpstar 138 won't idle, only starts when choke on?

[1redback]

hi iv got a new o7 orion thumpstar with a 138 cc engine with mikinu carby my problem is it will only start with choke on and even then it runs crap dies when i turn choke off? i have brought new spark plug checked elect connectors,cleaned out carby set it to 2nd notch from top off needle,check exhaust for air leaks etc

 

[cass38a]

It sounds like a blocked pilot jet to me. Has it ever been right or has it been crook from day one, If its been crook from day one get a new carby under warranty as it could be a fault with the carby.

 

[darb110]

will it run with the choke either off or on???

 

[1redback]

idle

will run with choke on but runs crap backfires taking out pilot and main jets from carby today and try and replace them any ideas where i can get mikinu jets from im in perth and how much they cost?

 

[1redback]

bike was running good from start as well

 

[darb110]

nah cant help you with the jet bit.. yeh if it was running fine from start id change your jets and see how that goes

 

[cass38a]

Just give the jets a good clean and blow out with compressesd air. make sure you get the pilot jet as well as the main.

 

[mickalomaniac]

sounds like its running a bit lean dude... i say that cos by the sounds of it if its only running with the choke on its forcing more fuel in... if you richen it up and give the carby a clean up that might help

 

[mickalomaniac]

i only say that cos if its been running and running well then there may be no need to replace things that just might need adjusting...

 

[1redback]

just took it to mech he can deal with it

 

[dirttau]

witch mechanic and look in the quokka for bike shops