QuestionThis bike has sat for about a year I put fresh gas and seafoam started it up and it only runs on cylinder 1 & 2 cylinder 3 & 4 does not have spark replaced plugs,swaped spark units,took side cover off found a little oil on pulse coil wiped them off and still no spark on 3 & 4 what should I try next?
AnswerCarroll, Honda coils seldom just die on their own, especially both of them at the same time. Make sure they know what they are doing so you don't pay for parts that aren't really defective.
The ignition timing is preset, unless the advancer somehow fails, which is a very remote possibility. Likely the carbs need cleaning most of all.
Bill Silver
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Carroll, the pulse generator coils run in oil in the left side of the engine. Oil doesn't affect their performance.
Coils are for cylinders 1-4 and 2-3, so if you have no spark on 3&4, then something else is happening. Check spark plug caps for 5k ohms, coil voltage going in to each coil. Test coils with leads plugged into fresh/new spark plugs and check again for spark. Spark jumps from center electrode to ground on one plug and opposite polarity on the opposite plug in each coil. I doubt that the ignition is the problem here.
Your big clue here, for me, is that it sat for a year. Unless you drained the carburetors, before it went to sleep, the carburetor jets and passages are probably clogged up with evaporated fuel deposits. Carbs need to be removed, cleaned, have new o-rings/gaskets replaced and then reinstalled again. Check fuel filter inside the fuel tank for being plugged up, too. Petcock passages can get blocked, depending on how it was stored.
If you have the vacuum fuel control system, the diaphragms can fail as well as those on the air cut valves.
Bill Silver
