Dead cylinder at idle

[Green Farmer]

I have a dead cylinder at idle but it starts coming in while riding and getting on the gas.2nd cylinder from the left sitting on the beast...Any suggestions?.....Plug maybe?

[Guest]

I have a dead cylinder at idle but it starts coming in while riding and getting on the gas.2nd cylinder from the left sitting on the beast...Any suggestions?.....Plug maybe?

Check your fuel petcock vacume line , you may have gas in the vacume line which means the fuel cock is bad and flooding that cyl.

[koolaid_kid]

Could also be a clogged pilot jet circuit.

[Green Farmer]

There is a lot of gas on the carb.I was thinking it was possibly spark shortage.

[tkent02]

I was thinking it was possibly spark shortage.

Well, does #2 have spark?

[Green Farmer]

Well, does #2 have spark?

A small one.

[tkent02]

Small, just like #3?
Or is this a two cylinder engine?

[Green Farmer]

Small, just like #3?
Or is this a two cylinder engine?

It is a 78 gs 1000...#2 seems to have the weakest spark...i was trying to think of all scenarios.

[tkent02]

OK, then disregard the thing about the petcock, that's on #3 on your model.
Two and three share the same ignition and coil, if the spark is strong on three and weak on two there is your trouble. See if you have a bad spark plug cap or corroded spark plug wire connections. It also could be the spark plug itself.

Try this, swap the plug wire between 2 and 3 to see if the trouble moves with the wire, or stays with the plug.

[Green Farmer]

OK, then disregard the thing about the petcock, that's on #3 on your model.
Two and three share the same ignition and coil, if the spark is strong on three and weak there is your trouble. See if you have a bad spark plug cap or corroded spark plug wire connections.

Could be just a lame spark plug, have you swapped 2 and 3 to see?

I have not...i will try that next...it has new wires,dyna coils and ignition.I have only owned it 9 days...trying to work out the bugs.thank you very much.I also said 2nd cylinder from the left while sitting on the bike....im not sure what number that is.

[cowboyup3371]

2nd from left is number 2. 1 is under clutch hand and 4 is on the far right under your brake hand

[850 Combat]

Could also be a clogged pilot jet circuit.

That would be my first thought. Or way out of synch.

[saffa]

what type of carbs are they...cv or slide.

I had the same but with slides. checked all fuel and leccy circuits only to find nmumber 2 slide had dropped slighty so was shut at idle whilst the other 3 had the normal slide gap. all fine when throttle was open though.


just a thought.

[koolaid_kid]

78 would be VM carbs.