Now, to tune the weber 40 IDF Options

[purple]

I know it's been rehashed over and over again....

I have some questions on how to do it after futzing around in the garage trying to make SOMETHING happen.

I followed the carb clinic instructions to the T and I think something is adjusted wrong... Maybe you guys can help.

I have the idle speed screws to 1/2 turn past first contact with the arms

linkage disconnected

air bypass screws all the way shut.

all mixture screws out 1.5 turns

it'll start and run (slowly) and it'll get to what i think is around 450 rpm or something. really slow..

the only way I can get it to idle at 450 or so is by having the mixture screws in pretty far. two cylinders dont even react past a certain point! i can have them all the way in (lightly) and the engine doesnt change its note at all!

Please ask me questions so I can give the right info. I've never done this before but i'd like to believe these arent fiddly carbs.

When they say the engine should 'speed up' is it a really noticeable change? because mine's so subtle as to be not affected.

please help guys!

these are brand new carbs from jake's store. I have the box that says what the jetting is. i'll post that soon.

what are 'jets' and what do they do?

[rhodyguy]

first, if you're trying to do this with the engine lid on, take it off. perry nails it but i don't quite understand setting the idle/air mixture at 14-1800 rpm. once you get the linkage near spot on it's easy to turn the idle up by just using one idle adj screw. the other side will follow suit. this method works well for me to fine tune the linkage. if the flow changes it's simple to bring one or the other carb in by turning the droplink rod in or out.

k