I've been running my totally rebuilt 250/31a engined 250 Scottish for a year and came to inspect the engine after it started to become noisey over a period of time and discovered that the big end has developed just noticeable vertical play. The engine performs brilliantly through sections but I've never really been happy with the engine at road speeds as it vibrates quite a lot and tends to run hot (pink) as if the carburettor settings have altered despite fiddling with ignition timing (The instructions supplied with the Electrex ignition were quite vague and in any case the thing wouldn't fire at all either side of a 'sweet spot'. Anyway, it always starts easy and never kicks back so the ignition can't be far out!. The S22 carb is set up exactly as it should according to the Carrick/ Walker book but it still pinks like hell at medium revs. Oh, and it's got a decompressor head with a squish band but no identifying marks.
I have a complete (full circle) spare crank with a short conrod which I believe can be used with a 197 barrel with a correspondingly shorter deck height. Will this 197 barrel/crank setup be smoother running?. I think the barrel is 10E ?. I'd really appreciate some feedback as I know diddly squat about these engines.
I have a complete (full circle) spare crank with a short conrod which I believe can be used with a 197 barrel with a correspondingly shorter deck height. Will this 197 barrel/crank setup be smoother running?. I think the barrel is 10E ?. I'd really appreciate some feedback as I know diddly squat about these engines.
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