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Hi David, Carb sounds similar to or the same as those used on motorcycles. There should be a low speed mixture adjustment screw & stop screw for the slide to adjust the idle speed. High speed mixture is usually adjusted by raising & lowering the needle in the slide. High speed jets can be...

Hi, You're right about the threaded fastners. Whitworth (coarse threads) & BSF (fine threads) were used on vintage Brittish items. Check vintage Brittish auto & motorcycle sites & shops for parts. Bolts & nuts are available, but not always easy to find. What kind of carb does your saw have on...

Thanks for the advice. Will try 32:1 & post results. Tree, you're right about it being an older saw. Has "KIORITZ" on nameplate above ECHO. It was used when I got it several years ago, my guess is that it was built in late 70s (has point ignition & very little plastic). If any one knows when...

I have an Echo CS 451 VL chainsaw; factory specifies 20:1 ratio. While ordering parts at the local dealer I asked the Echo factory Rep. what ratio to use with Echo 50:1 oil. Rep. said to mix @ 50:1. I know the newer oils are better, but I don't want to find out that 50:1 is too lean. I've always...