CB125T carb jetting

[ajb235]

Finally got my CB125T on the road today.
I had the cam reprofiled to what I thought were the "desirable" hot cam timings, and it wants to rev but no more than about 10k. I have open carbs, I couldn't find any inlet connection hoses or air filters.
So to compensate I am thinking I should increase the main jet size. The other factor is the 142 cc conversion. The exhaust have been cut open and the inner down pipe removed.
From various websites I have found that the standard main jet size is 88. I would go up to 100 with my mods.
Has anyone tried this, or have any recommendations?
I think I'm going to be busy trying to sort the front brake too....

[Robby]

No-one is going to have exactly the same setup as you. It should be setup on a dyno, seeing as it's so different from stock. I would recommend getting the original airbox back on if you want to ever tick over and work at anything less than wide open throttle.

[ThatDippyTwat]

As said, play around. You'll need to get it in the ball park by asound, response, and then do a plug chop or 3 to confirm/tweak. If you're not dyno'ing it, favour a rich setup so you don't bang the motor.

Had to go from 90-something to 105 on my 125 single (Different make/model) when I binned the fucked airbox and chucked a pod onto it, it already had a different exhaust because you can't buy stock exhausts anywhere. Over that it pops and bangs, indicating it's rich enough to put unburnt fuel into the exhaust.
____________________
'98 VFR800 (touring) - '12 VFR800 Crosrunner (Commuting) - '01 KDX220 (Big Green Antisocial Machine)

[terrytibbs]