It could be as simple as a lean burn misfire if its on bike carbs.It only has to be lean on one pot and it will spit back and pop on a pot. I would not touch the thing with the spanners untill you have run it up to temp with water in the system and checked all the obvious. All this random stuff is exactly that, of all the suggestions someone will be right just by chance.

bob

Not sure if this helps but I had an R6 a few years ago and had problems with it bogging down when pulling off, took it to a bike repair shop and they found it to be berthing back out the inlet, turned out to be worn piston rings. Might be worth considering. Joe

Thanks for all the replies on this one guys. Still haven't had a chance to do anything about it yet, mrs has been keeping me busy working on the house :( Hoping to get the coolant system sorted soon so I can try getting it up to temp and see if it still does it. The engine has more or less been sitting in the roadster now for a couple of years only being switched on briefly every couple of months.

It can't be that long can it?

TT

Ya it's amazing really how quick time goes by sometimes :eek: I'd love to finish the build off by the end of this year which would make 3 years but it's unlikely at the rate I'm going!

It does not matter how long it takes you to build it as long as you don't stop.