Nibbi 26mm on Venom x20

mjmi11er · 04-19-2021, 08:14 PM

So I've replaced the stock carb and intake with Nibbi parts. I started with the air fuel screw 1 turn out and the fuel screw knob 2 turns out per the video on YouTube of the a guy tuning this carb on his mini dirt bike. With the 40 pilot the bike will immediately start without the choke and run without issue and has a crisp throttle. Everything else seems to be an issue though. Way to rich under throttle. With a 100 main jet it was bogging almost immediately. I've worked my way down to a 75 main with the needle all the way down. It still requires a smooth throttle and it starts bogging around 8k. The plug is also way too dark with a chop test. I ordered some 60-70 main jets to try to go leaner... or am I missing something?

Should I start over adjusting the screws with a smaller pilot in place first?

I just haven't heard anyone running a 40 pilot and 65 main.

What am I missing or doing wrong?

04-19-2021, 08:14 PM	#1
mjmi11er Join Date: Dec 2020 Posts: 9	Nibbi 26mm on Venom x20 So I've replaced the stock carb and intake with Nibbi parts. I started with the air fuel screw 1 turn out and the fuel screw knob 2 turns out per the video on YouTube of the a guy tuning this carb on his mini dirt bike. With the 40 pilot the bike will immediately start without the choke and run without issue and has a crisp throttle. Everything else seems to be an issue though. Way to rich under throttle. With a 100 main jet it was bogging almost immediately. I've worked my way down to a 75 main with the needle all the way down. It still requires a smooth throttle and it starts bogging around 8k. The plug is also way too dark with a chop test. I ordered some 60-70 main jets to try to go leaner... or am I missing something? Should I start over adjusting the screws with a smaller pilot in place first? I just haven't heard anyone running a 40 pilot and 65 main. What am I missing or doing wrong?
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