carb trouble

hi i was wondering if anyone could help me. i have an 04 plate gilera runner vx 125. i tried up jetting it with a 160 main jet and it would rev so i fitted the standard one back in. now all it does is lose power on the top end and power starts going and coming back and going again. i have asked several people and they all said it was fuel starvation. could anyone help me please.

 

you upjetted it with a 160 main jet hock: are you mad ??? :glare:

if its suffering fuel starvation, (and thats only your diagnoses) i would take the carb off and give it a good clean through and check the float isnt damaged and the float needle isnt sticking etc etc also check all your pipes are on properly and theres no air leaks anywhere.

could be electrical though...you tried a new spark plug??

also this is supposed to be in workshop...not general scooter discussion

 

i gave the carb a good clean and the float appears to be fine but how would i check the float needle isn't sticking ?

 

by making sure it moves freely in and out of its housing ok, and its actually attached to
the float tab...make sure the float isnt punctured, shake it, and if you can hear fuel inside it...its scrap

 

i tried removing the float but the pin won't come out. how would i get the pin out? thanks

 

i've done everything that you said and everything looks fine. its still the same.is there anything else anyone can think of that mite be causing my problems. please help thanks

 

get a small nail or philips screwdriver (slightly smaller than the pin.make sure its a lil smaller than the pin)

then tap the nail with a small hammer ot anything

just be careful

allways works fine that way for me

 

ok thanks i did that and the float seems to be fine. is there anything else it could be ?

 

valve clearences fuel tap fuel pump. carbc connected up wrong air leak you name it

 

ok thanks the carb is connected up fine. what do you mean by valve clearance . can the fuel pump and the fuel tap be repaired. if they can then how would i repair them.
thanks

 

Valve clearance is the gap between the valves and head. If the clearance is wrong it will run shit. Ive had this on a piaggio leader engine, the bike ran well upto 55mph then it'd stutter down to a hault and cut out, then not start untill the engine cools. Turned out the inlet valve was sealing against the head then getting stuck when the engine was getting hot.

 

Fuel pump and tap can be replaced, you know what google is, use it. Shouldnt take a min to find a good shop selling replacement parts.

 

ok could you run me through how i would sort the valve clearance out please. no probs al get some replacment fuel bits and am olso going to replace the spark plug because it looks a bit worse for wear lol
thanks

 

haynes manual ftw :good: