87 K75S low rpm stutter

[tomsljr]

I have had this k-bike for the last 2+ years. Recently it has developed a slight stutter at low rpm's. Any guesses?

[glennbolder89799]

I have had this k-bike for the last 2+ years. Recently it has developed a slight stutter at low rpm's. Any guesses?

how old are the spark plug wires? that was my problem recently.

[tomsljr]

I don't know how old they are, at least 2-3 years old.

[toddlamp]

Stutter as in missing?

I changed my plugs not that long ago and the bike started missing. I put the only plugs back in and everything went back to normal. My guess is a plug is starting to go. Take a look at them and see if there is any cracking of the insulation or wearing on the electrode.

[roncooper]

My 91 75RT has started to make a stuttering/missing sound when the throttle is just above idle. I can't feel anything, just the sound. Is this what yours is doing?

[tomsljr]

It is stuttering very slightly when throttling up from low rpm's. As soon as the rev's get up it goes away.

[Gilly]

I had that, like leaving a stop sign and you could almost describe it as the bike "falling on it's face", real bad stuttering and lack of power. Mine was from the rubber fuel pump insulator breaking down and plugging up the filter. Is your top enf OK? (which means, dare I ask, will it break 90 mph no problem? When mine had this going on I also couldn't go over about 70-80 mph with it)
Gilly

[toddlamp]

It is stuttering very slightly when throttling up from low rpm's. As soon as the rev's get up it goes away.

Sounds exactly like the issue I had. Anything under 2k rpms and it was missing. I replaced the spark plugs and have had no issues.