Question about 2005 Yamaha V Star 1100 Classic

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Misfire forward cylinder

Front plug wet, rear plug black. Resistance of plug conectors 9k ohms on front 7k ohms on rear. I have found most bikes run around 5k ohms. What is the correct reading. At higher rpms front cylinder will attempt to fire. Both plugs will fire removed from cylinders and grounded

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First you'll need to get a jet kit from West coast star. Then you'll need to jet the carbs to run equally. This may take some trial and error. Another thing that worked on my bike was the upgraded coil kit they sell. It's almost double the voltage of the stock coils and comes with better insulated wires for a more uniform resistance. I haven't had this problem since. It'll make the cylinders fire evenly and save you from those pestiferous fouled plugs. I hope this helps.

Posted on May 12, 2009

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2002 harley electra glide front spark plug turns black

A blackened spark plug is a sign of a rich air/fuel ratio or a misfiring plug. You stated that you changed the coil and wires, but did you change the plugs? Spark plugs, even new ones, can, and do, go bad (excessive internal resistance). Make sure that the plugs are also the correct part number for your application, as they could be of the wrong heat range for your bike. I have even heard of guys using a colder plug in the rear cylinder and a hotter plug in the front cylinder because the front cylinder tends to run a little cooler than the rear (increased air flow in the front).

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Battery condition and connections may cause misfires. Inspect for corrosion at battery terminals, main circuit breakers, ignition fuse terminals (GY and R/BK), right handlebar connector [22] and coil connector.

Fuel system problems may cause misfires.

Spark Plugs OFTEN cause misfires, even plugs that look good. If carbon tracking is evident, replace them.

Spark Plug Wires may cause misfires - Front/rear 20 in. 5,000-11,666 ohms. Wires must be clean and tight. Excessive wire resistance or faulty connections can cause coil damage. If carbon tracking is evident, replace the ignition coil and inspect the spark plug wires. Spark plug wire connectors can corrode and should always be coated with dielectric grease to prevent this. If there is any corrosion replace the corroded parts.

Coils may break down and cause misfires but not usually at a given rpm range only. Coil testing can be performed by substituting a known good coil for one causing the no spark condition. The coil
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You can also test the coil by leaving the "hot" wire on the coil and replacing the other side (ground side) with a short piece of wire. Turn the ignition on and temporarily ground the short piece of wire you put on the "out" (ground) side. When you take the wire away from the ground, (which will collapse the primary current into the secondary) you should see a spark at the plugs if it is a wasted spark system or at one of the plugs if it is not a wasted spark system. If you have current to both sides of the primary of a two part coil both plugs should get a spark whether wasted spark system or not as you are energizing both sides of the primary and collapsing both into both secondaries at the same time when you remove the ground wire from the cylinder head ground.

Take the plugs out of the cylinder heads and lay them back on it so that they have a good ground. Then watch the spark plugs closely when you turn the ignition switch off. You should see a single spark on each plug. This tell you that the coil is getting fire and that it is good and your problem lies elsewhere. You get a spark on both plugs because it is a wasted spark system that fires both plugs simultaneously, one on power stroke and the other on exhaust stroke. This will not work on 2006 and later EFI as there will be no spark with both plugs removed.

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