CG125 carby expertise

[stroker crazy]

Thinking about replacing the carby on the 'Ace' (http://www.dotheton.com/forum/index.php?topic=43357.0 - it works well enough for now but I would rather use a unit that I can easily get jets etc. for.

Does anyone have a recommendation? I've heard there was a pumper carby used back in the day, and that Mikuni VM22 makes a good replacement. Any advice welcome!

Crazy

 

[teazer]

What size is the engine, bore and stroke and what size is the intake port at the manifold?

 

[stroker crazy]

Apologies for the lack of critical detail teazer! My only excuse is that it was a late night idea formed after partaking of several fermented beverages.

In the cold* light of day:

Motor - Chinese copy of CG125
Capacity 124cc
Bore 56.5mm
Stroke 49.5mm
Manifold 30mm

Will post pics of existing carby later today
*It's not really cold; 17C at 11:20am on a beautiful sunny autumn day!

Crazy

 

[stroker crazy]

Original carby, nominal diameter 26mm:

Crazy

 

[stroker crazy]

Apart from the replacement jet issue, the reason for changing the carby is to maximise the efficiency of the motor. Going to a larger carby could be a step backward, although to my eye (coming from mainly two-stroke experience) it seems the throat of the standard unit is somewhat constricted. I have no intention of reworking the motor, it is easier to ride a larger capacity motorcycle than to compromise the reliability of this little pushrod single.

Hope someone can save me from re-inventing the wheel!

Crazy