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DarZeelon -> RE: My old K&B will not run (5/5/2008 8:31:59 AM)
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Andrew,
If your fuel is not very old (i.e. still has enough methanol in it and has not absorbed too much moisture - methanol is hygdoscopic...), the plug gives a good orange glow and the engine has a decent compression, this engine must at least manage a brief 'growl' if all three are present in the combustion chamber...
Turn the plane over so the cylinder will be upright and check the carburettor for fuel flow, by connecting a length of silicone fuel-line to the carburettor and blowing through it, while operating the throttle and/or turning the main needle.
Now, reconnect the line from the fuel tank, make sure the main needle is ~2.5 turns open, open the throttle to full, choke the exhaust outlet and flip the prop over twice...
You should see fuel in the line and even in the carburettor.
(*) Set the throttle to 20% open, make sure the engine turns over and now, power the glow-plug and flip the prop, or 'blip' it with the starter.
If the engine still maintains the 'no comment' stature, carefully remove the glow-plug and drip 3-4 drops of fuel directly through the plug hole, into the chamber.
Reinstall the glow-plug and repeat the (*) paragraph. It should respond.
The presence of good fuel, compression and an ignition source, are all necessary for combustion to occur.
Adjusting the engine is the subsequent chore and this is what the high and low-speed needles are there for.
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