Hi

I'm having troubles with my MVVS 152 twin spark. The first issue has come about recently whilst the second I have had from new.

1. At full throttle it is really unstable, there are violent pulses as if it keeps cutting. I have tried adjusting the needles and it seems to have have some effect but it does not go away wheteher rich or lean..

2. The tuning seems to vary dramatically depending on whether I am upright or inverted. I know on the 58 you run a pipe from the breather to the back of the fus to provide a constant pressure but there is no nipple on the carb of the 152 to do this.

Please can you help?

Regards,

Tom