2x 42 DCNF tuning...

[antonio]

hi
thanks to good avices, i'm close to finish my 2 x42 dcnf upgrade...but i really don't know what chokes, jets, air co... to use.
my engine is a 2 liters whith a CSC exhaust.
maybee someone can tell me "basic" tuning for my carbs and where to find parts

antonio

[markalen]

I have 42s also, and would like to know what jets to use.

[simon_fdl]

Hi,
I have 40s and 44s, I didn't know they made 42s.
The 40s have 35mm venturis, 120 mains and 180 airs.
The 44s had 34mm venturis, 140 mains and 205 airs. I've just fitted 37mm venturis - 2 from Pierce Manifolds in the US and 2 locally fabricated from one of the Pierce samples.
I'm 1500m above sea level, so my jet settings may not be applicable if you are at sea level.
The Pierce Manifolds site has good downloadable documents on basic carb settings. There are formulas for calculating jet sizes based on altitude.
Cheers, Simon