Issue - It starts but has a misfire after 3 seconds and will not run on idle or main jets but will run on pump jets but back fires and puts flames out of the carbs! Was running OK but the last 3 years has a pop from the exhaust several seconds after the engine has stopped.No oil from breather in catch tank and engine has not burnt much oil in the past. Done 11 miles last year and 34 miles per year in the previous 2 years. Dry stored in garage. Engine Spec - Standard Caterham sprint spec from 1989 with NODIZ 3D ignition Tests done:- Compression check psi warm with throttle open using Chinese compression tester - 140,130,135,135 - (I've not done a wet test yet) Leakdown test (using rubbish Chinese low pressure version) - valves good, cooling system no bubbles, no leak between cylinders, but noticeable leak from block and rocker box breathers. Ignition timing good on timing light - Good spark but new coil pack and plugs just to check. Throttle position sensor signal working and calibrated. Fuel system flushed and new fuel used plus carbs stripped and ultrasonic tank cleaned. Fuel level in carbs checked. Fuel pressure checked. New seals on carb to manifold. Supply voltages and earth bonding checked. Any ideas what the problem might be? I have sticking piston rings or glazed bores left on my list but thought I'd ask opinions before starting a full engine strip.
