I have not had my NSR long and know it probably sat for some time before me getting it. I have noticed that there are some sparks coming from the right hand exhaust on the overrun once it is fully warmed up. It starts well and pulls well, although can be a bit wooly at the top end.

Is this something to be concerned about or it it just coked up from not being used? Hope it's not the cylinder caoting coming off?

Any ideas?

Thanks
HRC

Just to add. The right hand pipe has a lot of oil in it and continues smoking after it has been turned off. Getting worried it might need a rebuild