hi guys,i have a problem here..
now my b210 is running with rebuild a14 engine+twin solex 40's,but i can't rev more than 5k rpm..it seems like not enough of fuel supply to the carbies or spark (my guessing

) when i rev it hard..i've changed the distributor from contact point to electronic distributor and coil too..
but its still the same..

what is the problem here?i've no idea to settle this out..please shed a light to me :)
thanks :)