billytraynor

Hi A simple fix. Your pilot jet is way too lean. Regards BillyT

Mikee One of the best ways to calm the bike down and a very tunable way is add a reed spacer plate. Start off with 5/16 thick and work you way down from there. Meaning try it at one thickness and then surface grind to another takeing off small increments at a time. Place it between the reeds and cylinder. It will make the compression lower due to increasing cylinder volume. This trick has been used for years and is proven to quite successful. It does not change any port timings. There are numerous other advantages that it offers that will off topic so I will not go in to them here. Cheers BillyT

Hi to all. BillyT here. Interesting to still see this topic floating around after all of these years. The mods posted to the tangs and the hose routing solves this problem WHEN DONE CORRECTLY. There is no need to drill any holes or add any float bowl extensions. Granted these adjustments should have been done at the Beta factory, but they were not. The adjustment I posted many years ago where indeed part of a standard training I received and most good carb tuners out there are well aware of this basic adjustment. I did not invent it I just applied it. I see too many suggestions that re-act to the symptoms and not actually addressing the problem. Kind of like taking an asprin for a headache, the asprin only masks the reason why the headache is there to begin with. Many new riders to a Beta or new posters to this forum are unware of the history af this carb as to why, how it ended up on a Beta. And why the carb came from Japan (Mikuni) like it did. Take care all............. BillyT