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Hello mate.. Pleased to hear that you're on the trail of another Monster.
First, M900ie is a bloody nice bike, as good as the Monster got in my opinion.
2001 could be hoop or rod rear suspension as that's the year they made the transition.
Could also be the early, nice simple ECU with mechanical speedo or the later ECU with immobiliser and all electric instruments (diagnostic sweep on start, I think?)
Big ends don't usually whirr, they hammer, and get louder as it goes on!
In the (g)olden days we used to put the front wheel against a wall and see how much clutch you could let out, to test the big ends... ! A bit brutal to say the least, but it would certainly show up any hammering from below.
To be honest my gut feeling would be the starter motor sprag clutch, which wouldn't be a major problem, although they can be a bit of a bitch to do, I am told. Okay if the bike was cheap enough.
Another suspect would be the clutch, but that is more a rattle than a whirr.. You've heard them, so you'd probably recognise that. You'd replace most of the clutch for circa £200, an easy job.
A whirr is going to come from a bearing somewhere. If it's in the gearbox or primary drive, it's going to need an engine split to fix it, so it gets complicated as you have to check everything before it goes back together. If it's a dry belt tensioner bearing(s) then that's easy and relatively cheap.
Worst case scenario would be to budget for a replacement engine, which could be anything from 500-1000 quid, then you have to know the provenance of the donor engine.
So it's a game of chance unless you can have a really good listen and look yourself.. How far away is it? Could you make or get a good recording, so we and say Carl Harrison could hear it?
I am unexpectedly available for the foreseeable, so I can look at it with you if it is viewable and not in Scotland or summat.
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