redline76

'98 with 18K on the clock. Not jetted, but it does have an aftermarket exhaust, engine is stock otherwise.

At idle, It'll hover around 1200-1300RPMs steady and then there's something akin to a quick miss which is heard/felt through the bike like a "clunk" and then it's back to idling normally.

Other than this, the bike runs fine up through the gears and never misses under load.

I still have to change the plugs; could this be the cause?

Obviously I'm paranoid that it's the tensioner but I don't have enough experience with twins to know if the bike is making funny noises or not. Sounds fine to me

Any help is appreciated, thanks.

Loco

If it only happens when cold, then there is your problem, but if it happens at all idling, I'd say you have a dirty idle jet. One tank of carb cleaner ought to solve that, at 18k miles I would do it as routine maintenance.

You would know if you had a spark problem, as it is not dependent on revs, and you would really lose power at riding speed.

I would rule out the tensioner, though, because from what I gather, that isn't really a factor at idle.

redline76

Cheers, I'll try it with the new plugs this weekend.

Loco

If I could suggest: do only one of the solutions at a time, otherwise you'll never know what you're problem was. That's Rob Muzzy's advice not mine though

CNI Dawg

Check for dirty or sticky carb slides next.

Doesn't take much dirt to make it hic-up