Power loss on a road trip. Diagnostic help needed.

[Spyderman]

well if you want you can try the points plate again and see if its the dyna if not then you need a coil maybe.
but more importantly you need to fix the petcock and change the oil because you most certainly have gas in the oil and that can bring a quick end to your motor.
the petcock and oil and needle and seats need to be fixed right away. this is be cause the fuel is running through the carbs into the engine when the bike is shut off it may right now be not leaking in the reserve position but if it leaks in the run position when your not riding then it will soon be leaking in the reserve position too

[btbarb]

I've seen VM carbs overflow and not really notice a power loss or idle problem and other times i've seen them overflow and make it impossible to hold an idle and basically shut the cylinder down at any throttle position. Maybe it's as simple as your petcock and seats and you're only running on 2&3 and at that, degraded. You mentioned your mileage was half of what it normally is, even crappy tuning won't cut your mileage in half, would assume you'd have to be dumping fuel to cut your mileage in half.

[MAC10]

Thanks guys. I understand my Vm29 carbs have drain tubes to handle carb overflow, so it does not go into the crankcase.The gas was dripping out of them. I checked the oil, there was no smell of gas, but I changed it anyway as a precaution. Not a good situation regardless. I need a new petcock.

Now that I have inspected the plugs and 1 and 4 are the culprits, then the 50 per cent reduction in fuel mileage is explained. Half the fuel was being blown out of the engine unburned. Two cylinders worth wasted. Ran on two cylinders and made it home. What a bike!

I will pull the carbs as time allows, and remove the bowls to inspect everything. When I do the rebuild, needle and seat replacement on all four makes sense, along with everything else.

[OldVet66]

A module failure is unpredictable, some just stop, others give you fits trying to figure it out before they quit. If you know anyone with a Dyna-S, swap the plates to eliminate or confirm the problem. Change your plugs, they can fail from fowling. You don't need two conflicting problems going on at the same time.

[MAC10]

I am focusing on the coils or the dyna s as the probable culprit, given that cylinders 1 and 4 are getting fuel but not firing. I have limited time right now, so work on it as I can.

I checked the coils with a multimeter:
Left coil, which runs cylinders 1 and 4- plug wire to plug wire, caps off 12.2 ohms
between orange/white and white 4.4 ohms

Right coil which runs cylinders 2 and 3- plug wire to plug wire , caps off 12.4 ohms
Between orange/white and black 4.5 ohms

These are within spec.

I set up my old points plate, and noticed that the left set of points does not turn off. The static timing light I am using stays lit whether or not the points are open. The right hand set of points, which runs 2 and 3, go on when they are open and off when closed as they should. The points plate was running well when I replaced it with the dyna, so it is a known good part.

Does this indicate a short somewhere?

I am moving this question to the electrical section, to keep it relevant.

http://www.thegsresources.com/_forum...is-help-needed