My single carb 376 with a light filter persists on running rich and sooting plugs. Even the expensive fine wire ones. And despite my best efforts they are not happy to be cleaned as the soft ceramic insulators are now not glazed and soak up any oily soot . The mixture screw needs to be 3 turns out to keep the mixture somewhere close. I think I will have to try a 20 pilot jet, does anyone use a 20 on a dommy.?. Have not seen any recommendations on jetting changes with a filter.I am also using Esso top grade to avoid the eth issues and I think that also tends to make for richer running.
Have you tried it...
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Hi Ian, On this model to get…
Hi Ian, On this model to get the filter out is a pig. Remove side panel ,remove battery ,reposition wiring. unbolt filter cover unbolt filter box studs,and battery tray ,wiggle box and glued in filter thro forest of wires ,replace battery carrier and electrics to try out.The reason I won't run without a filter is these models have poor internal mudguarding and throw a lot of dirt at the carb area . Putting the poorly made box back is a major fiddle with the rubber connector fighting you . Best unbolt oil tank and lean away for room. No thanks .
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Have you
Rechecked your float height? I know you have done mods to the needle valve area, but is the fuel level still 'on the dot'?
You may recall my 650 was running like a pig (very rich at and just off idle) last year after the rebuild, and it turned out to be the float not shutting off properly. In my case Amal stayup was more like staydown.
In my case, an extra float chamber gasket 'resolved' the issue completely. Worth checking before you tear your hair out completely!
Regards, George.
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Hi George, The weird thing…
Hi George, The weird thing is I can go from sooty plugs to spitting back off idle ,then for a few months all is well and I have a slow even tickover to die for. It may come to a new carb. I went back to a brass float after sticking games with plastic. **** light bulb moment, its the bloody fuel, no .consistency ,the last purchase was a tank full of genuine Synergy plus. Previous purchase was EO5 in the Synergy pump and I adjusted for that. Thieving gits.
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... without the filter?