Good to hear you are running,6000 ft is not enough to make a good running bike stumble,may want to get it sorted before you get into real elevation.

We have a holiday place at 6000 ft in the Alps and I've gone there on quite a few bikes / cars over the years. They vary tremendously on how they cope with the altitude. Some don't notice it at all but others have real problems. The worst (I've had anyway) are the old single cam Hondas (I've had four (of different sizes) over the years inc a 400/4 atm). They all stumble and spit and run really badly by 6000.

Anything with a CV carb runs ok but you can feel some power loss. You'd think modern F.I. stuff should be ok but a couple of those (cars) have been sluggish starters and my TD5 Land Rover (an instant starter in the UK) coughs a few times before firing up at 6000ft but can be really tricky when the temp drops below -10C - even with winter fuel etc.




Re starting after a lay- up, it's the float bowl fuel that's the killer - it kills me anyway trying to get them going without changing it. I've got two bikes that absolutely won't start if left for more than a couple of weeks without draining the float bowls and refilling with fresh fuel. After doing that they're first or second kick (or electric crank) starters. I once spent a "happy" complete morning (8am - lunch time!) at 6000ft and -10C trying to get my XR600 going after not using it for a week before I twigged the float bowl fuel issue.

It must be carb design or something as it's evaporation of the volatile bits of the fuel while the bike's standing that's to blame. I've got other bikes where it takes months rather than weeks to do the same and a couple that start straight away no matter how long they've been left. In general the more "sporty" the bike the more of a problem it is. My antique 125 commuter bike, designed to be used and abused, will start after being left for months.