Hi i have a good spark on all cylinders and carbs are all set correctly but as you sit on bike and look down left hand cylinder is not fireing and keeps flooding

The coils are set up as follows
Left coil, Orange lead wire: Cylinders 1&4(outside cylinders)
Right coil, Gray lead wire: Cylinders 2&3 (inside cylinders)

The firing order is 1-2-4-3. Number 1 cylinder is the left hand one as you sit on the bike, number 4 the right. HTH

i would actually replace the caps and leads on side not working, a bad connection may still spark when not under pressure, then test coil before i think about cdi

Plugged carb passages, if CV carb, hole in diaphragm, stuck valve, bad plug. Do you have spark on both cylinders? Use a spark plug in each plug cap and make sure they are grounded or you can damage the black box! Look for cracks on the coils.

You might try looking at your transistor it could be the cause of your problems. Even though it is a carb bike it will still have an transistor pack or similar that controls your spark. It is possible that failed. Try one from a bike that you know is working if that makes a difference that is your problem.
Although I'd also look for broken wires and poor contacts.
If your good with a multimeter and you know the specs of your coils and transistor than you can try and test them.

first try cleaning the carbs, new spark plugs and adjust valve clearances, new oil and clean air filter, before any screw adjustments, which will need some vacumn gauges attached to set the carb sync

G'day. I can help you here! On all early model japanese 4 cylinder motorcycles,
number 1 & 4 cylinders share one coil( the left hand coil as seen while sitting on bike). Number 2 & 3 cylinders shares the other.

L/H coil- 1 & 4
R/H coil-2 & 3

Hope this helps
Regards Andrew Porrelli

Hi and welcome to FixYa,

For and MC22, seated on the bike, the left hand ignition coil fires cylinders 1 & 4 while right hand ignition coil powers 2 & 3 cylinders.

Good luck and thank you for asking FixYa.

Hi JIm,
If it stopped @ 4 tht means thts the only cylinder firing .
Remove the spark plugs,earth @ on the cylinder head, crank start and check for sparks...if its sparking tht means the coils etc. are ok.
As the spark plugs are out exam them to their conditions visit this site for more details :-
http://www.spark-plugs.co.uk/pages/technical/diagnosis.htm

From here you would know if its carburator or probably it may need a complete tune up....carburator cleaning, float level..adjustment, valve clearance.. new plugs (gap to specs.), check air filter, replace or fit 'inline' fuel filter thn balancing of the carbs.
Hope this helps!

Hi and welcome to FixYa,

Initially, if there is spark on the plug of the front cylinder, then it would be a fuel issue. Pls try:

• Rig a fuel bottle to replace the fuel tank;
• Remove the airbox assembly to expose the carb;
• Start/run the bike, spray carb cleaner on the open carb;
• note the RPM or sound of engine. Determine if front cylinder will fire even erratically. You could also try the exhaust pipe if it warms up (pls be careful might be overly hot);
• rev the bike then cover the carb mouth of the front cylinder with the palm of your hand;
• there should be a strong suction indicating that vacuum is created when on the intake stroke and intake valves are opening;
• the palm of your hand should be wet with fuel, if not carb issue;
• might require a rebuilt.

Good luck and Thank you for using FixYa. Happy New Year.