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Brand new coils, brand new plugs, I tested the cdi for polarity and there where no shorts I checked the coils but they are literally brand new, should I check alternator/rotor. This morning I attempted to start the bike as well strong spark the first 20 seconds then immediately stops. Is...

Bike was running perfect for about 2 weeks all of the sudden I go to turn it on and 2 cylinders aren’t firing, I wait sit in the garage and ponder. Go to turn it on once more now only one fires. Long story short by the third time I tried to turn it on no spark to any cylinders. It will spark...

I double verified gasoline to each carb and everything checks out checked spark again and that was visible and strong the engine is still only operating on 2/3

I checked carbs and I’m getting gasoline to each carb still only operating on 2/3

@brettp Rebuild carb?

@brettp I have spark on both coils

Update bike started after valve job and checking wires and spark Bike starts up with an extremely high Idle and only operating on cylinders 2/3 I checked back for spark on the coil pack responsible for cylinders 1/4 and still had spark could it be a carb issue?

@brettp No stock air box, k&n filters Spark yes Fuel yes Carbs are operating flawlessly

Just recently purchased a 1979 Honda cb750k Here’s what I’ve done, Oil/ oil filter Head gasket Tires High octane gas Carb clean And currently in the process of replacing the valve shims The bike simply won’t start, timing is perfect everything is tightened to spec I have spark, fuel and...