1988 750 and its running on one cylinder. As its running I pulled off the front cylinder spark plug cap and it stays running. I stuck a plug in the cap and touched it to the frame looking for spark and nothing. Thought, OK, maybe a bad coil so I picked up a set of used ones on Ebay (that said they worked) thinking this was an easy fix but still nothing. Still only runs on one cylinder. Any way of checking if the coil is bad? I thought since the one cylinder runs fine of maybe trying that coil on the one thats not working to see if the coil itself is bad? Any thoughts on my issue?

Read the thread below yours a bit in this 750 Paso topics list called "Replacement Coils" from October of 2016 for some info and procedures which may help you find your electrical fault. The thread is a tad meandering and redundant, but it may prove useful to review. You will learn a few things valuable perhaps. Best of luck to you!

or the topic "Weber woes" just two below. Also have a look at the FAQ there`s info about the wiring mod and a picture showing how to check the coils.

No carb issues, no coil issues (tested them) well actually no electric to the front cylinder, did the little black ignition things under the set and both are fine....stripped a bunch of wire cover to see if something was grounding out...nothing! I'm at a loss! I do have a full wire harness and thinking I'll switch it out???? If it doesn't run after doing that I'm pushing it off a bridge!

Not sure how you load tested the ignition units (under the seat next to your regulator). I struck a similar problem to you with a cylinder losing spark. The engine would start and idle fine but cut out under load (anything over 3000 rpm).

Have you tried swapping over the ignition units , and seeing if the problem transfers to the opposite cylinder?

Cheers,

You really need a multi meter , which with you can measure volts and resistance. A budget one can be had for the price of Feed of Macca's ( a really good one could cost a grand ) . If you have changed over ( from one cylinder to the other ) both the coils and the black boxes and the fault stays with the front cylinder its pretty safe to assume that its either there is no power to the coil or the pick up is duff..........both of which you need a multi meter to confirm
http://www.ebay.com/itm/Digital-Voltmet ... SwHnFVkYPk

Dude , I don't want to sound derisive or smart arsed but teaching someone how to use a multi meter , ohm's law and basic electrical theory over the internet is a recipe for disaster , Do you have anyone there who could show you how ? work mate , buddy ? Even a budget meter will come with instructions but they assume that you have a working knowledge of electricity . Your not likely to damage anything ( maybe the meter itself ) but I imagine it could get #ucking frustrating real quick if you don't understand what its trying to tell you, and your likely to be chasing your tail . If you want ( last resort ) I will try and go thru this with you but Id rather do it via email simply because its way easier to post pix of whats going on ..... and there would be a few, so if you want PM me and we can go from there

While Hamish will explain you the details I will only mention one or two things.
If you have the meter plug the black probe to its COM connection and the red probe the connection that`s named mA/V/Ω.
Set the scale to DCV (or V= which is the same) and 200V. Switch the bikes ignition ON. Hold the black probe to a blank piece of steel that`s connected to the frame for instance the bolts of the coil mounting bracket. (Of course you can also hold it to the battery`s negative pole). There's an orange wire connecting to a spade connector on each coil. Touch the spade connector (w/o pulling the orange wire off) with the red probe. Read the voltage the meter shows. Done. You should try measuring the voltage of a small battery first just as an excercise.

Measuring resistance is fairly easy, too. If you want to check the coils disconnect the battery (!) then pull the ignition wire off the spark plug and disconnect the wires connected to the coils' spade connectors.
Set your meter to the Ω ohms scale and 200Ω. Then connect one probe to one spade connector and the other to the second. Read the primary resistance of the coil. Repeat with the second coil.
Then set the meter to 20KΩ connect one probe to a spade connector and the second probe to the spark plug connector of the ignition wire. Read the secondary resistance of the coil. That' s it.
Disconnecting the battery is a safety measure. You don`t want to try measuring resistance if there`s power on whatever you`re trying to measure.