Stu,
Kal sent an email.........
Mitch Willcocks fitted a Keihin PWK 28 to his 04 Beta. Took the carb off his old Sherco and bolted it onto the Beta. Worked a treat!
He was experimenting and trying to get a smoother power especially off the bottom end. Had ridden Sherco all his riding career and found it difficult adjusting to the Beta power delivery.
He was very happy with the Keihin and said that it also gave the bike more power as well as a much smoother delivery, bonus was no more leaky carb. Only down side is that the idle and mixture adjustments are on the wrong side!
Mitch is currently riding in the UK on a 05 Beta set up as standard as he felt it was too much trouble to mess about with it over there.
Turned out Mitch was right about the power as I had the bike tested on a dyno with both carbs and even the mechanic couldn't believe the Keihin delivered about 10 percent more H.P!
So if you find a Keihin PWK 28 with adjustments on the right side for a beta let me know as I would like to purchase one.
Regards Mike Willcocks
Australia