[terdah2]

I looked at the setup of my carb. and I wonder if it is ok. for this bike? I have not thought that the power at full speed/ full trottle, is impressive so I wonder if it can be wrong?

The engine has #"DU 63721" The carb. has #930/9

Mainjet: 240 needlejet: 107 needleposition: in the middle groowe
Throttle valve: 3 1/2

 

[GrandPaulZ]

Sounds close enough to work.

the problem is that these caarbs need to be meticulously cleaned in the internal passageways. Soaking metallic parts in berryman's chem-dip for 1/2 hour is the ticket.