Thread: Engine: 140 1986cc B20A: - Rough Idle solution?
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Old Aug 1st, 2021, 16:46   #3
john.wigley
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Quote:
Originally Posted by Burdekin View Post
I'd go for a vacuum leak. Hoses, hoses clamped, brake booster nrv, carb isolating plate cracked etc.

But first check timing is correct. Set at 1500rpm with advance hose blocked off.
Check valve clearances.
Check vacuum leaks.
Check oil in dashpot. I use 80/90 gearoil.
Replace carb diaphragm.
I'd go for the quick and easy checks and fixes first - dashpot and diaphragm. I always carried a replacement diaphragm as part of my 'essential spares' kit when I was running 1 and 2 series cars in period.

Regards, John.
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