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Please update here if you make any progress. For the time being I will try to change fuel and a hotter plug. A longer needle might work, as long as it's compatible.

The fact we have the same model and the same problem worries me, kind of points towards a faulty something that comes with the NRB-5...

Yes, it's a SH.21 engine, less than 3 liters of 16% fuel old. Disassembled the carb today, cleaned it, o-rings looked fine. Lubed them, put everything back together, there is no change whatsoever.

Hi sv250, sorry if this is a stupid question but what leads you to believe it's the 0-rings?

Hi, I have the exact same car, the exact same problem. Top needle is set on the lean side, even when I overdo it and it bogs asking for more fuel (almost dies from fuel starvation), the bottom is screwed in all the way in, still incredibly rich. It so rich that on a fully warmed up engine, after...