jetting

[mitchy]

got a yx 140 gen 3 and trying to run a copy mikuni v26 carb at the moment its got 17 pilot and 130 main jet bugger to start and when i knock off the choke it just dies.Gettin a bit peeved with it now so stuck it back in the garage.Whats the best jet size for ease of starting? And are the gen 3 motors known for being crap to start.

[Gosmeister]

you need to change jets. i got 17.5 pilot on my vm22 on a 110. so you need bigger one and my 160 has a main jet of 108 so small lol

[mitchy]

Cheers bud,ive been running a molkt 26 on it which was a bugger to start now ive changed it for the mikuni its worse,cant bloody win

[Gosmeister]

pull the mikuni off and have a look what jets are in there, where is the problem with mikuni eg 1/4 throttle

[mitchy]

Its a bugger to start and when it does as soon as the choke is off it dies,then its a bugger to start again

[Gosmeister]

idle jet then right turn your fuel screw in say half a turn and try that, then try again but 1/4 turns when its is nearly there, stop the bike and count the turns out from softly seated position (fuel screw)and this will tell you what jet you will need

[mitchy]

Ive had fuel screw 1 1/2 turns out from seated and gone in anouther 1/2 a tyrn and it still wont tickover

[Gosmeister]

no but does it start better try another half turn. basically if you get it nearly there or better and the fuel screw is nearly all way in go a bigger jet size

[mitchy]

no bud its just turd dont seen to be getting anywhere with it.

[Gosmeister]

clean the plug mate and try again tomorrow. you will get there and feel so good, try richen some more and see if you can use less choke.