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koates · 09-07-2021, 02:49 AM

Henry, You do realize that those two mixture screws are for the IDLE SPEED MIXTURE only and have no effect on the engine mixture at anything above idle speed. Main mixture is controlled by the size of the main jets which are a fixed size. There are various sizes of main jets available. Too read the plugs you need to go for a long drive (30 miles) at a bit of speed and then check the plugs. The shit fuel we get these days could be the cause of plugs blacking up. Maybe a set of plugs one range hotter will help but I would not worry to much with plugs sooting up a bit especially if you do short runs around town all the time. Regards, Kevin.

09-07-2021, 02:49 AM	#11
koates Senior Member Join Date: May 2010 Location: Melbourne Australia. Posts: 2,082	Re: Stromberg question Henry, You do realize that those two mixture screws are for the IDLE SPEED MIXTURE only and have no effect on the engine mixture at anything above idle speed. Main mixture is controlled by the size of the main jets which are a fixed size. There are various sizes of main jets available. Too read the plugs you need to go for a long drive (30 miles) at a bit of speed and then check the plugs. The shit fuel we get these days could be the cause of plugs blacking up. Maybe a set of plugs one range hotter will help but I would not worry to much with plugs sooting up a bit especially if you do short runs around town all the time. Regards, Kevin.