Hi guys,

Today while cruising on the freeway in 5th gear, my MC21 bogged and then lost power completely.
I pulled in the clutch and coasted to the shoulder (luckily.) Ten minutes or so later while waiting for a tow, I kicked it over again and it fired up. Rode the remaining short distance home without incident.

So... where do I start? I don't want to risk ignoring this incident for obvious reasons.

Any tips or advice are very much appreciated!
Thanks

Quick history: Obtained the bike last year at 15k Km. Cleaned carbs, fresh fluids, battery etc. upon purchase- Have put on 3k since then. No issues (until now) since I've owned it. Bike is completely stock except for pipes jetting, daytona filter (and tires). Running oil pump.
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PROSPEC QUARTER !!

What condition is your tank in (any rust or the likes)? change your plugs, whip your exhausts off to check there is no damage to the pistons and barrel.

If you are really paranoid, drain and change your fuel.

Sounds like a fuelling problem. If it started to die, and then, moments later died completely, I'd say fuelling. It doesn't sound like you ran out of fuel (if you were able to ride home) and I am sure you tried putting it on reserve to see if that made any difference. So, what I am trying to say is, perhaps there is a blockage in a fuel filter or some thing? These bikes are getting old and I know that when fuel tanks get a bit of rust in them they can block up fuel filters quite easily. Could be worth shaking the tank out to see if any rust comes out over a bucket.

The other possibility is a loose ignition connection. Though usually that would only affect one cylinder, so you'd still have some power...
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MC21 Honda NSR250. TYGA 300 conversion.

It does sound like fuel starvation to me too - the symptoms you get as you run out of fuel and have to switch to reserve before that looming corner EEEK!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball