the only thing ive noticed between the d4 and the b44 is on the d4 the support for the front shock tower is a lot weaker then on the b44,and when you get an impact it breaks the gear case,do you still have that b4 you got of si-co? if i was you id stick with that, set it to the manual, set the shocks same as everyone else does,stick around 40grams of weight in front,set speedo to smooth throttle so its not to agressive .thats what i did with mine when i first started racing this year and it works great,
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