I need help before i take it to the dreaded dealer. Its a 2005 4k miles on it missing badly. I changed both coils NGK wires NGK plugs are new. I checked the fuel seems fine. The only problem I'm having is the right rear plug is missing. I'm a car guy and not good with motorcycle terms so don't shot me to hard on it. I'm going to get the battery charged up today and going to check the vacuum lines to make sure there connected properly. Other then that I'm at a lose. I have a friend that use to build custom bikes and he told me to check the vaccum lines on it that might be the problem but he's unable to look at it due to health reason. need help havent riden this bike in 2 years for this problem and due to my own injuries from Iraq and I'm in the riding shape again.
This is a 2 cylinder engine and has 2 plugs in each cylinder. The second plug is to start another burn from the other side of the cylinder and contribute to more complete combustion and lower emissions.
So even with the right rear plug not firing, the rear cylinder should still be producing a large percentage of its potential power.
If the rear coil is failing, both rear plugs would not fire, - and you would have a definite misfire situation.
You say you have 2 (new?) ignition coils, new ngk plugs, and new ngk plug wires.
After charging your battery and checking the vacuum lines do these checks.
Try pulling all 4 plugs again and check to see if any are wet. What color is the ceramic insulation around the center electrode.
Are all 4 the same color, or are the rear ones lighter colored (indicating a leaner fuel mixture).
After these checks, ground the plugs against the engine.
Crank the starter over and double check which plugs are actually giving you a fat blue spark
(Have a fire extinuisher handy as you are dealing with gas and sparks.)
What did you do when you "checked the fuel"?
ie. is there fuel in both carb bowl drains?
Post back and let us know what you find.