Cold pipes #1 and #4

[bluesmoke]

Last week, carbs cleaned, valves adjusted, manfold o-rings replaced along with boots. New plugs. Now #1 and #4 cyl not firing. Pipes are cold after a minute idling. Plug wires seem to be ok.

What am I overlooking?

 

[koolaid_kid]

Plugs #1 & #4 are both fired by the same coil. You need to see if it is firing, sounds like it is not. Start at the plugs, pull one and see if it is getting spark. If not, check that coil to see if it is getting 12V on the orange/white wire. If it is go back to the igniter, then back to the signal generator. BassCliff has these procedures on his web page.

 

[Johno]

check the wiring to the coil

check the wiring to the coil

When removing the cam cover to adjust the valves it is easy to disturb the wiring to the coils.

Guess how i know?

 

[bluesmoke]

Plugs #1 & #4 are both fired by the same coil. You need to see if it is firing, sounds like it is not. Start at the plugs, pull one and see if it is getting spark. If not, check that coil to see if it is getting 12V on the orange/white wire. If it is go back to the igniter, then back to the signal generator. BassCliff has these procedures on his web page.

Thanks Johno and Koolaid. I will check that out first thing this am. I was staring at the wiring diagram late last night and wondering if a connection was loose. Before I had the bike serviced, it was running on all four. I'm hopeful this is the problem.

 

[bluesmoke]

Problem solved!

Problem solved!

You guys were right on the money. The plastic molex connector for the orange/white wires wasn't making full contact, so #1 and #4 plugs werent firing. Now it runs like a dream, except the idle is way too high - because it was only running on two jugs when the shop set it.

You have to wonder what the mechanic was thinking when he finished the job. Clearly, he didnt road test the bike or notice that it was bogging.

Thanks for the help!

 

[Steve]

Before I had the bike serviced, it was running on all four.

You have to wonder what the mechanic was thinking when he finished the job. Clearly, he didnt road test the bike or notice that it was bogging.

And you wonder why we keep preaching "DON'T TAKE IT TO A SHOP"? :-K

.

 

[bluesmoke]

Lesson learned. I was too impatient.

And you wonder why we keep preaching "DON'T TAKE IT TO A SHOP"? :-K

.

 

[Guest]

Now it runs like a dream, except the idle is way too high - because it was only running on two jugs when the shop set it.

You have to wonder what the mechanic was thinking when he finished the job. Clearly, he didnt road test the bike or notice that it was bogging.

Surely this must make you stop and think, "what else may the mechanic have overlooked?" My experience is that I'd rather do the work myself if it's within my capability and I have the tools, or have to rework it myself in the end anyway. No one cares about your bike more than you do.

 

[Johno]

You guys were right on the money. The plastic molex connector for the orange/white wires wasn't making full contact, so #1 and #4 plugs werent firing. Now it runs like a dream, except the idle is way too high - because it was only running on two jugs when the shop set it.


Thanks for the help!

30 year wiring and connectors can be fragile and easily disturbed. Make sure your electrical loom is fastened correctly to the frame to prevent rubbing and loose connections. check it over from headlight to tail light for peace of mind.