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Bringing my 250 NC M3 back into action
Posted: Thu Dec 18, 2025 11:12 am
by Bevel bob
Not rode it for a couple of years , and last time it was not happy (kept spitting back and stalling ) , so as part of the process i will raise the fuel level a smidgin and enrich the tickover a tad . Cant for the life of me remember whether the pilot screw is in or out to richen on an SSI29D ! The blurb in the Dellorto literature is pretty vague too.
Re: Bringing my 250 NC M3 back into action
Posted: Sun Dec 21, 2025 3:03 pm
by Bevel bob
As no one seems to know! i checked and on ssi up to 30 mm the mixture screw is the same as a monoblock in is richer. Over 29 mm its the opposite .
Re: Bringing my 250 NC M3 back into action
Posted: Thu Feb 12, 2026 8:44 pm
by Bevel bob
I am doing whatever possible to make my 250 less fussy in traffic and give a more reliable tickover. I have some steel sleeves that i intend to fit in the carb , "think chokes " that may speed up the airflow in the carb and increase the venturi effect , hopefully will help to pick up fuel for the idle. The 29mm SSI is too big , as are the 40 mm inlet and 36 mm ex valves .Cant do much about those. I have a(reputidley) Red cam to fit (which appears little different to a Monza cam?.). I will probably drill a hole low in the carb slide to provide air flow for the tickover , and allow the slide to sit right down . Anyone tried this ? size? . Seen it done on GP carbs with BSA gold stars. No slide in the SSI side chamber ,fill in slot or leave open?. Will definately need a side stand , anyone got one ?. Also still on the lookout for a pair of swann neck bars to replace clip ons.