Carb question - jet siezed (not sized!)

[Scott S]

Hi All –
I am a long time member of the 914 group and I am just getting feet wet with 6 cylinder stuff. I am in the process of a -6 conversion. I have a 2.7 that will be running carbs (40IDTP). They were fully gone through, the shafts are great, and they are very very clean. Last night I was going through parts and decided to pull the air/emulsion tubes just to see what they had in them (the carbs came from sea level and I am in Colorado – around 6200 feet). It was everything I could do to get the jet to turn/unscrew in the bore – I could not believe how stuck they were. I didn’t even attempt to do the second carb – just sprayed the thing with carb cleaner and let it set over night.

Is this normal? Once they broke free, they were very easy to turn and the emulsion tubes came right out – unfortunately the top of the brass jet where the screw driver rests is now gnarled. I have a modified screw driver that is the correct thickness for the slot in the jet, and that was ground on the sides to fit into the bore on the carb. Being that I am sure there will be some trial and error in getting this motor jetted correctly, is there a way to prevent this in the future?

On my current -4 motor I am running dual 40’s and have never had this happen in 10 years – every thing comes a part very cleanly (the car only has 10k miles on a 1996 rebuild however…)

Thanks for any help!
Scott S

[Steve@Rennsport]

Scott,

Some perspective is required here,.....

I think its important to realize that all of these old parts (IDT's) are 39 years old and have been through many ham-fisted hands over the years, Between that and corrosion, sometimes these are in sad shape.

If the Air Corrector jets are chewed up, one should buy new ones to ensure the airflow into the metering well is uniform and laminar.

The "fix" is not overtightening things,... All they need to be is snug and thats an aquired feel. Properly done, they will not loosen and can be extracted as needed.