ok, w/ the bbq5 race coming up, i'm hoping to squeeze a bit more speed out of my bianchi. it runs fine, and at least 35mph or more (my speedometer seems to max out about there). but ... once it hits critical top speed (esp on downhill) it starts to stutter a bit ... like it wants to go faster, but something's holding her back. it doesn't slow down, just briefly accelerates a bit more before dropping down to its original top speed. it's like i hit a wall and the bike just can't go faster.
here's the set up so far ... it's a minarelli v1 engine w/ good compression and timing. it has a dellorto 15.15 carb (w/ large airbox, two wholes facing towards the engine), a polini custom exhaust muffler, and a size 53 jet. oh, and a 10-tooth front sprocket. starts up fine, and seems fine otherwise. any ideas?
i do have an 11-tooth sprocket i might throw on (at the risk of losing some bottom end). but if anyone can think of a reason for the stuttering, please let me know. thanks.