Hey i need some real help. Ive changed the gas tank (silver coil & ignition pack) ive changed the spark plug coil where it screws on too. I dont not what to do next, when i take one wire plug off the bike it starts fine (when warm) when i do the opposite side the bike will not start.
I read that thse bikes have always had starting problems on cold start, and one guy says he cleaned the carbs and it starts perfect when its cold? please someone give me some advice on this bike please.
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Re: cold starting problems 1981 yamaha maxim 400
Could be a few things going on . have you checked the vacuum lines? could have one plugged or collapsed? Could be a carb problem? have you installed a carb kit yet ? or you could try a hotter spark plug.
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Check for black smoke out of the tail-pipe when the engine is revved. Black smoke means unburned fuel. The most likely culprit is a plugged air filter/air intake. A plugged exhaust, especially the catalytic convertor will kill your fuel economy and power. It may also be in need of a good tune-up (spark plugs, filters, ignition wires, distributor cap/rotor). Also check tire pressures and make sure that you don't have any seized brakes.
Probably gas or spark related. Check for spark on a spark plug wire, or on a couple of plug wires would be better. If you have a strong blue spark, then the coils are good, ignition is good, and you will need to see if gas is getting up to the engine. Do you hear the fuel pump come on?
Unplug the engine control sensor wiring connectors from the ignition coil and the radio ignition interference capacitor.
Tag and disconnect the spark plug wires from the coil by squeezing the locking tabs, then twist the tab and pull upwards.
Unfasten the four ignition coil retainers and remove the coil and the coil ground wire the radio ignition interference capacitor. Save the capacitor and coil ground wire for re-installation of the coil assembly.
Wipe the coil towers with a clean cloth dampened with soap and water. Remove any soap film and dry with compressed air. Inspect the coil for cracks, carbon tracking, dirt or damage and replace as necessary.
YOU NEED TO NUMBER TAG ALL SPARK PLUG WIRES ON COIL PACK MODULE IN ORDER SO YOU PUT THEM BACK IN ORIGINAL PLACE.REMOVE ALL PLUGS WIRES FROM COIL PACK.THEN DISCONNECT THE ELECTRICAL CONNECTORS ON COIL PACK MODULE THEN REMOVE COIL PACK.NOW YOU HAVE MORE ROOM TO GET TO BACK PLUGS.YOU NEED A LIGHT.A SMALL MECHANIC MIRROR.YOU NEED LONGER 3/8 EXTENSION.PROBABLY PLUG WIRE BOOT PULLER NOT MUCH ROOM TO PULL THE SPARK PLUG BOOT WITH HAND.
Is the coil pack working at all? It could just be a simple ignition ground gone bad, or even a power wire corroded to badly. Also, clean the connections between the plugs and wires, and also the coil pack and wires.