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from TK/Mikuni tw to Nibbi

ripdrag0

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Joined
Mar 21, 2025
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2
Switched to a nibbi pe28mm carburetor and this is how it went. slapped the nibbi on stock and ran okay but definitely on the lean side. as I start tweaking, it went up to a 120 main jet initially. It consumed too much fuel and its fuel eco tanked. I then lowered the needle one slot and went down to a 115 jet which put me back to lean and so i changed the jet to a 118 and there it is, i hit the swee spot for me. from then on I adjusted the air/fuel mix (ended up around 1 3/4 turns out each time) and put in a ffresh plug to see what goes on. Bottomline ive been satisfied since then, nibbi ftw for now. lol. throttle response is way way better now and much smoother. defo worth the upgrade.
 
@ripdrag0, sounds like you've been through the full carb tuning rollercoaster, glad to hear you found the sweet spot at 118, messing with jets and needles can be a pain but the improved throttle response makes it all worth it, solid upgrade.
 
Sounds like you dialed it in really well, finding that sweet spot at 118 after testing different jets is exactly how to get the most out of the Nibbi. Glad to hear throttle response and smoothness improved., thats usually the big payoff with these carbs. Have you noticed any difference in plug color or temps now that it's running where you want?
 
@ripdrag0 Nice work dialing in that Nibbi! Hitting that 118 sweet spot is exactly how these carbs reward patience. Glad to hear throttle response and smoothness improved. Did you notice any changes in plug color or engine temps after the adjustments?
 
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