carb problems – GV125 Aquila Carby
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Bike Model = : gv125
hi all i have a gv125 with carb problems.
the fuel pump is ok and the float bowls on the carb are full but no fuel reaching the engine
the carbs have been serviced so they shoud be good but the bike just will not start
with the air box off and pour some fuel down the intakes the engine runs ok
i have checked the float vacuems and they are good, i am trearing the rest of my hair out so someone please heeeeeelp
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Hi , this sounds stupid, is it possible that we have no vacuum due to air leak from the intake orings ? Like below:
Intake Pipe O-RING (Inlet Boot Seals) x2 – GV125 GT125 RX125 GV250 GT250 Hyosung
So in essense, the GV125 is quite sensetive to how much vacuum loss happens and makes it very hard to start (and it prefers the airbox systems to all stay joined up down to the air filter itself) (Hopefully it is not running on pod filters as they hate it)
If you’re totally sure the intake system has zero leaks , look at the carbs again and blow the Pilot Jets one more time. The hole for the jets don’t take much to clog them.
Also see the “Permanent Jet” that is next to the pilots ? It is the tallest & skinny jet with the smallest hole, can’t be removed from bike = This controls starting the bike, you want to blow that hole as hard as you can to free up any debris.
Then put everything together slowly , turn on FULL choke, crank the bike while twisting throttle up & down (every quickly!) for max 5 seconds (as not to overheat the starter motor) = you should see fuel rushing down the filter and going to the carbs
It should start….
If not , crank the bike for a few seconds and switch off. Wait a whole 5 mins to cool the starter motor , crank again…. Stop ===> Open the “Drain Screws” and have a CUP under them.
See which bowl is getting more fuel than the other ===> eg. Front carb gets fuel OK, it drains out on the float bowl screw mini pipe but the rear does not drip any fuel out, this means rear carb is jammed or re-do the whole float system on both carbs.
Float height should be around 7.00mm to 7.5mm max (This is when the carb floats are resting on the carb float seats and they are facing the sky (carb is upside down)
Look at this topic and read float height information if it helps below:
Let us know how you get on or if you need clarification on anything I’ve said.
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