Nibbi PEZ28 on 2024 CSC TT250

[superjocko]

Putting the float bowl back on this carb is just a bit fiddly. I start the stand-off tube into the well in the bowl and then gently help the bowl find its way home at a slight angle until everything goes freely. If you're not careful to do that, it would be fairly easy to knock your float level out of adjustment.

Don't get yourself too worked up over it. Making little mistakes and learning from them is how you know better than to make them next time.

[bigdano711]

Originally Posted by Sdmfjon

Update. That worked. No stumbling, no gassy smell.

I still can't crack throttle from idle to anything 1/2 or beyond. If I bring the bike off idle it's fair game. Oh well. I don't want to spend 300 dollars on a really nice genuine pumper carb like my hondas have.

Final tune for now.

Stock bike. Emissions removed and a Nibbi PEZ28 fitted.

38 idle jet
Needle position 2
Air screw 1 1/2
Main jet 115.

I think this is a good "base tune". I think your 35 pilot is too lean. If I were you, I'd go back to this tune and try dropping the main jet one at a time and see if things don't improve.