Hawkonair
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It’s running, just needs an oil change and I’m looking forward to the drive.
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
The bike runs only with the choke on; it accepts throttle, but stalls at idle without the choke.
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
It’s likely not necessary because it only activates with full throttle and doesn’t pump continuously; it’s probably just for priming before the first start.
Alright, if it’s not strictly necessary, I’ll just leave the 250cc carburetor in.
Installed the 250cc carb using 125cc intake hoses to maintain vacuum delivery.
Okay, if you say the electronics are all identical, including the coils and everything, then I’ll leave it just as it is.
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
If I take the caps from the 125cc carburetor and install them on the 250cc one, that should be enough, right? That’s the only difference.
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
The first carburetor is from the 125cc, while the second image shows the one from the 250cc.
Since I’m converting to a vacuum system, I noticed the 125cc carburetor has differences that the 250cc doesn’t. Do I need to use the 125cc carburetor body and install all the internals and controls from the 250cc into it?
Since I see this on the 125cc carburetor, I assume it’s also part of the vacuum system, right?”
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
I’ll use the 250’s carburetor setting, only the front main jet to 95 and the rear main jet to 98.
Can I use a 98 in the rear, or is a 97.5 strictly necessary?
I’m using a BMC air filter and will install a full Turbo Kit exhaust system.
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
Should I only change the main jet and pilot jet?
Because according to Hyosung’s technical data, I also need to change the main air jet, needle jet, and starter jet.
I wanted to raise the needle and install a sports air filter.
I also have a 95 and a 98 main jet; would that work as an upgrade, or does it have to be a 95 and a 97.5?
Thanks for your help, and I’ll let you know how it goes.
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
I Found this
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
I also disabled the secondary air pump immediately.
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
Thx Marcel
Do I only need to swap the main jets, or do I also need to replace the pilot jets and other parts in the carburetor?
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
If I convert to vacuum, can I use the intake hoses from the 125? With the carburetor setup from the 250?
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
Are the intake hoses of the 125cc and 250cc carburetors on the cylinder head the same?
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
I need help
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
It is a 250 Naked Model from 2005 with Mikhuni Carbs.
I Read that 250 musst have a elektric full Pump…
I heard the 250 needs an electric fuel pump to keep up with fuel delivery at higher RPMs.
Can I use the vacuum pump, tank, and the rest of the setup exactly like on my 125cc?But doesn’t the 125cc have a narrower intake manifold with one of those nipples in it?
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
Hi everyone,
What all do I need to convert from a 125cc to a 250cc?
I saw that the 250cc has an additional electric fuel pump. Do I need to swap that in as well?
Or is it enough to just use the engine and CDI unit from the 250cc?
BR,
Hawkonair
GT125R BMC, Full Turbokit GP, Carb Front 90 Rear 92.5
