PRACTICAL SCOOTERING
Sometimes a customer brings a scooter in that hasn’t got any obvious issues, but experience tells you, something just ain’t right. The trick then is, figuring out what the hell the problem is…
A chap recently arrived at the garage with a scooter that wanted a tweak to the carb on the dyno, he’d explained that he’d been running a new Scootopia 185 kit with a 22mm carb and a Clubman pipe, but it just kept spluttering, even with a small main jet. As he’d wanted to upgrade anyway, this was his cue to fit a 30mm YSN PHBH style carb and a ScootRS expansion, yet still, he was having the same problem. Finally, after much trial and error, road tests, re-jetting and so on, he eventually got the scooter running in a fashion that he was mostly satisfied with and just felt it needed that final tweak with a bit of confirmation on the dyno, for peace of mind.
I ran the scooter up on the dyno, warmed it up, and gently put it through its paces. It was exactly as he had explained, and the air fuel graph wasn’t
