Nibbi PEZ28 on 2024 CSC TT250

Sdmfjon · Today, 01:49 PM

Hello

I can now confirm the Nibbi PEZ28 is a direct fit for the 2024 TT250. I did not have any issues with fitment. This carburetor sits almost exactly where the stock Keima sits. The throttle cable is just long enough to work. I did not have to modify anything to make it fit.

Tuning on the other hand, this is where I'm at.

Fully stock bike with emissions removed and a Nibbi PEZ28 carburetor fitted. I am in Maine and live at the beach. My elevation is less than 50' and it is summertime. Sunny day and about 85 degrees air temp.

Idle jet - 38 (factory was a 40 and too much for my stock setup)
Air screw 1 and 1/4 turn out ( factory is 1 and 1/2 )
Needle - position 3
Maine jet - 110

Idle is beautiful and strong. WOT is ok. Midrange needs adjustment.

I still can't quick throttle without it dying. I can roll on and it is fine. Only had like 45 mins to tune before having to go to work.

The max jet the carb came with is a 110. I think I either need to mess with the needle or change to a 112.

The air screw on the side is awesome.

ProDigit · Today, 02:01 PM

First try to lean out the mixture with the AF screw. 1/2 to 1.5 turns.
If that works, and you're happy with wot performance, then lean out the mixture by lowering the jet needle (raising the clip), and resetting the AF screw back to before.
It'll reduce low rpm torque, but if it gets rid of the stalling, you'll have to find that perfect acceleration setting.

If it got worse by leaning out the mixture with the idle screw, try richen the mixture by 1/2-1.5 turns, and see if that improves throttle response.
If it does, raise the needle instead.

Today, 01:49 PM	#1
Sdmfjon Join Date: Oct 2023 Posts: 15	Nibbi PEZ28 on 2024 CSC TT250 Hello I can now confirm the Nibbi PEZ28 is a direct fit for the 2024 TT250. I did not have any issues with fitment. This carburetor sits almost exactly where the stock Keima sits. The throttle cable is just long enough to work. I did not have to modify anything to make it fit. Tuning on the other hand, this is where I'm at. Fully stock bike with emissions removed and a Nibbi PEZ28 carburetor fitted. I am in Maine and live at the beach. My elevation is less than 50' and it is summertime. Sunny day and about 85 degrees air temp. Idle jet - 38 (factory was a 40 and too much for my stock setup) Air screw 1 and 1/4 turn out ( factory is 1 and 1/2 ) Needle - position 3 Maine jet - 110 Idle is beautiful and strong. WOT is ok. Midrange needs adjustment. I still can't quick throttle without it dying. I can roll on and it is fine. Only had like 45 mins to tune before having to go to work. The max jet the carb came with is a 110. I think I either need to mess with the needle or change to a 112. The air screw on the side is awesome. Attached Thumbnails
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Today, 02:01 PM	#2
ProDigit Join Date: Aug 2013 Posts: 241	First try to lean out the mixture with the AF screw. 1/2 to 1.5 turns. If that works, and you're happy with wot performance, then lean out the mixture by lowering the jet needle (raising the clip), and resetting the AF screw back to before. It'll reduce low rpm torque, but if it gets rid of the stalling, you'll have to find that perfect acceleration setting. If it got worse by leaning out the mixture with the idle screw, try richen the mixture by 1/2-1.5 turns, and see if that improves throttle response. If it does, raise the needle instead. __________________
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