What size main jet for CB250F? - Page 2

CementMixer90 · 12-08-2024, 08:32 PM

Hi All - Bumping this thread again. I have a quick question on the Nibbi Carb you're running on the Templar X. Are you using a 28mm or 30mm?

The reason I ask is that I installed a 30mm and it currently has the stock jet config of 128 main and 40 pilot. It has great throttle response on 1/4 or even 1/2 but when I go from 0 to full throttle it completely bogs and almost shuts off.

This happens on a fully warm machine. Idle is about 2k and air/fuel mix seems to be right and no indications of lean or rich mix and sounds healthy. No pops riding or hesitations until I pin it and then it wants to die. The elevation is about 750ft ASL.

Any thoughts? Thank you!

dgmartin · 12-12-2024, 05:03 AM

I have a 30 put it on the bike (templar X - 6 speed) straight out of the box, runs perfect. 1650FT ASL

View Poll Results: What size main jet for CB250F (ZS172FMM-3A)
=<120	3	37.50%
125	5	62.50%
130	0	0%
135	0	0%
=>140	0	0%
Voters: 8. You may not vote on this poll

12-08-2024, 08:32 PM	#16
CementMixer90 Join Date: Dec 2024 Posts: 1	Templar x Nibbi carb question Hi All - Bumping this thread again. I have a quick question on the Nibbi Carb you're running on the Templar X. Are you using a 28mm or 30mm? The reason I ask is that I installed a 30mm and it currently has the stock jet config of 128 main and 40 pilot. It has great throttle response on 1/4 or even 1/2 but when I go from 0 to full throttle it completely bogs and almost shuts off. This happens on a fully warm machine. Idle is about 2k and air/fuel mix seems to be right and no indications of lean or rich mix and sounds healthy. No pops riding or hesitations until I pin it and then it wants to die. The elevation is about 750ft ASL. Any thoughts? Thank you!
	0

12-12-2024, 05:03 AM	#17
dgmartin Join Date: Oct 2024 Posts: 34	I have a 30 put it on the bike (templar X - 6 speed) straight out of the box, runs perfect. 1650FT ASL
	0