No offense to anyone that has put the 740m carb on their bike, since I really appreciate info. from all of you that has spent the hours working out the bugs on your particular build.
I'm trying to add to the discussion by pointing out what the experts who built the carb have to say about selecting the correct size carb and calibration. The info. in the Weber tuning section is specific recommendations for folks adapting the carb to other engines/applications.
Here is the latest gem that I found today. After adjusting the jet sizes ( idle jet, main jet & air correction jet ), it says :
" With the carburettor calibrated whilst the car is staionary, the car should now be road tested to find out if any further adjustments are necessary.
............, take the carburettor through the progression stage to full throttle stage in each gear, noting the engine performance. If the engine appears to lack performance generally, but the mixture calibration seems correct ( my emphasis ), the choke size ( venturri ) may need to be reduced 1 mm or 2 mm . "
Interesting , but concerning ! That's not much of a change in venturii size to made a significant difference.
I'm trying to add to the discussion by pointing out what the experts who built the carb have to say about selecting the correct size carb and calibration. The info. in the Weber tuning section is specific recommendations for folks adapting the carb to other engines/applications.
Here is the latest gem that I found today. After adjusting the jet sizes ( idle jet, main jet & air correction jet ), it says :
" With the carburettor calibrated whilst the car is staionary, the car should now be road tested to find out if any further adjustments are necessary.
............, take the carburettor through the progression stage to full throttle stage in each gear, noting the engine performance. If the engine appears to lack performance generally, but the mixture calibration seems correct ( my emphasis ), the choke size ( venturri ) may need to be reduced 1 mm or 2 mm . "
Interesting , but concerning ! That's not much of a change in venturii size to made a significant difference.