Reply To: Flatside carbs
The BDS-Twin carbs used by Hyosung with Mikuni Japan making specific brackets for Hyosung bikes means even the airbox & intake rubber manifolds don’t any other carbs besides the OEM ones. Also there is also the issue of the engine moaning, its a tunning hell to use even Keihins but hey , sky is the limit!
If you can make a special airbox (Cone Filters are crap & always will be) and make special intake manifolds to hold the carbs in , then you could try to do it.
Also engine design expects “twin-carbs” (1 carb for each cylinder) , pistons don’t spin at the same rate/time. Unlike other vtwins. Hyosung sometimes is in a world of its own 😉
May i ask why ? The 125cc can never exceed the power capacity of the carbs because the GV250 also uses it. But tuning and ultrasonic cleaning is what goes a long way
Assuming “compression is 175 psi” – Clearances are “0.10 ish IN and 0.20 ish EX” – Clutch plates are 2.6-3.1mm thick, then engine is OK too. Sometimes a good carb is let down by a poorly engine or bad electronics and vise versa.