83 rm250 on an 81 rm125 frame
 

I bought this bike from a friend that had started the transfer.
All that I had to do was figure out how to stuff a carb and air breather on it and a chain.
I thought I might haft to move the mono-shock back a little, but I dont think Theres enough room for that.
I mounted the carb and plumed it in.
It runs and idles ok, has a snappy throttle response.
The problem is that when you try to rev it, it has no mid range or top end.
Do you think the intake is just to long?