Reply To: GT125 2003 Performance Issues
Hey,
The as long the pilot jet says it is size 15, it is OK. The pilots are working by the fact you said it idles and revs up like a dream. I would leave the mixture screws at 2.5 turns each and leave it there until i advise when to reduce or increase it based on how it behaves on its upcoming road test ride.
If the pump was opened and there was nothing faulty in it ? Have you connected the pump back to the fuel filter.
The hose that leads to the carb, take it off and see if fuel shoots out and does it flow it or comes out like a trickle drop drop ? If it’s the later, investigate the manifolds are fully sealed and the carb is fully sealed to the manifolds to improve the vacuum system to operate the pump.
Both rear and front manifolds should have nipples to send vacuum to the rear pump as it does need both engine cylinders cranking to draw it open.
Failing that, it may be time to replace the pump. It could be its original one and never investigated in the bike’s life time. They rarely fail , but it does happen & isnt uncommon.
The slide needles both look good to me, can’t see any obvious bending. However, i will say new is better than old. Remember the advise of setting to the 4th grove towards the pointy end or revert back to the 3rd groove , if it behaves lean, 5th groove it is.
The needles take full effect when the bike revs go up and you’re riding as its part of “main jet” fuel metering.
I am glad the bike is running at least, so i think our last stop is the diagnosis of the fuel pump and vacuum system. I got your email , i’ll reply to that one too shortly!
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