Sudden and repeated loss of power?

[Milts]

ZZZZ update time.

So the shop adusted the valves I think, can't find the printout at the moment. Took it for a ride shortly after in the pissing rain from Wellington to Palmerston -> gorge to Woodville and back. It seemed to fixed, I had a partial loss of power once just south of Shannon but the bike didn't stop, and recovered after about 30 seconds of crusing at lower RPM - hadn't done it since. It did, once, on the way back sort of bunny-hop. By that I mean the engine cut for a split second and came back.

It then started doing that a small amount just when you sat on 6k RPM. Didn't think it worth taking it back to the shop and paying to get it looked at again, so I figured next time I took it in I'd just ask them to check, it wasn't a big issue, only happened rarely at 6k rpm. Yesterday I parked it outside work, then trying to come home at 8pm it was spluttering the whole way - off on, off on. Hardly got it back in the garage, had to pull over at one point and let all the cages past. Tried it again today in the sunshine after it had been parked in the garage all night (instead of in freezing cold weather having sat in the rain for hours). Same story, unridable really. Called the shop, booked in again for this week.

Something is seriously off with this motor. Expensively so, too.

Oh, sidenote - it even does it (too a smaller extent) when idling. Some of the time, anyway.

[NJ83]

I had the exact same thing happening to my bike for the longest time and the shop couldn't track it down, but the air vent in the fuel cap had blocked,

next time it does it, open the cap and replace with one of those emergency caps from the gas station,

[glegge]

was the bike fine, ie did not have these problems, when you took it to the shop the first time? if so and it just went in for a normal service, then this shop needs to fix your problems for you - and return the bike to you working as it should. no cost to you. you have already paid for the service that you wanted, and they made the bike worse by the sounds.

so take it back, tell them you want your bike back working as it should. perhaps suggest they could try test riding it for a bit (some use it as a 'shop bike' to see if it plays up when they go to get parts - or lunch - or what have you) then they will know first hand the problems you are having.

anyway - i sympathise, it sucks when your bikes not running right.
if you give up on the shop - perhaps try another, if money is no problem.
Or, it's time to start looking at things yourself with a engine minded mate.

bugger.