spark plug lead pattern?

[Anonymous]

Thanks to tips from this site, my 81 650e is back on the road.
The engine was dying randomly and suddenly.
I changed out the coils, and did a variety of other maintenance items while she was laid up. Even put in a speedometer cable and painted the old hoss. Amazing how much speed those two items add. ; )

The new coils seem to have done the trick re. the power loss. But here's another question.
Does anybody know the proper spark plug pattern? When I lifted the tank I discovered the left hand coil was connected to 4 & 1 -- with the leads crossing each other. The right hand coil went to 2 & 3 -- not crossed.

I reproduced this pattern with the new coils and she starts & runs much better now. Dependable at all speeds. But she still sounds just a leetle bit rough -- like a very minor timing problem. On a whim I uncrossed the 4 & 1 cables, switched them & ran the bike for a little while. Smooth -- it could be my imagination, but it seemed to lose the roughness. But I didn't want to run it that way for too long -- just in case. (Crossed up some spark plug wires on the ol' Studebaker once and blowed up a muffler.)

So where can I find out the pattern for sure? I don't see it in Clymer. And if the original coil was supposed to be crossed, does that mean the "Acme" coil I bought from Cycle Recycler should have it's leads crossed too?

Anybody know for sure?

8)

[earlfor]

Re: spark plug lead pattern?

The left coil fires cylinders 1 and 4. It doesnt matter which spark plug wire goes to cylinder 4 and which one goes to cylinder 1. It also does not matter whether the wires cross or do not cross. You may place them which ever way makes you happy. :-) :-)

Earl

Thanks to tips from this site, my 81 650e is back on the road.
The engine was dying randomly and suddenly.
I changed out the coils, and did a variety of other maintenance items while she was laid up. Even put in a speedometer cable and painted the old hoss. Amazing how much speed those two items add. ; )

The new coils seem to have done the trick re. the power loss. But here's another question.
Does anybody know the proper spark plug pattern? When I lifted the tank I discovered the left hand coil was connected to 4 & 1 -- with the leads crossing each other. The right hand coil went to 2 & 3 -- not crossed.

I reproduced this pattern with the new coils and she starts & runs much better now. Dependable at all speeds. But she still sounds just a leetle bit rough -- like a very minor timing problem. On a whim I uncrossed the 4 & 1 cables, switched them & ran the bike for a little while. Smooth -- it could be my imagination, but it seemed to lose the roughness. But I didn't want to run it that way for too long -- just in case. (Crossed up some spark plug wires on the ol' Studebaker once and blowed up a muffler.)

So where can I find out the pattern for sure? I don't see it in Clymer. And if the original coil was supposed to be crossed, does that mean the "Acme" coil I bought from Cycle Recycler should have it's leads crossed too?

Anybody know for sure?

8)

[Anonymous]

Got it.

Thanks again!

Tim

[Anonymous]

if the wires were really close together or touching they may have been crossfiring slightly.

[Einar J Skog]

Hi

The coils with 2 wires fires both wire at same time.Every time the pistons are at top.It is called (wasted spark) system.
A neat system ,but the spark plugs are eaten faster.