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CD150 Piston Not Lifting


Darren Groves
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MK1 2L Vitesse with Twin CD150 Carbs.

 

The carbs have been stripped, cleaned and had new O Rings & Diaphragms fitted. Pistons on both carbs lift and fall freely. On idle the car is nice and smooth but when you increase the revs the piston on the front carb lifts as you'd expect but the one on the rear doesn't lift at all.

 

What's the most likely cause?

 

 

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Air filter gasket covering the atmosheric port

Air leak in the top cover

diaphragm mis located lugs and thebtwo holes in the bottom are not engine facing

 

diapragm made from something too thick ,

 

They should be thin and very pliable

 

pete

 

No air filters fitted, so not that.

Top cover seems a snug fit, so thinking that's probably OK, but will re-check tomorrow.

Diaphragm lug located OK in carb body and are nice and thin, I have the old ones so can swap back to see it if makes a difference.

 

"two holes in the bottom are not engine facing" - which 2 holes are you referring to Pete?

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With top cover off look down the sides of the dashpot , the bottom of the piston has two holes in it either side and behind the needle these should be towards the engine side not facing anywhere else

 

its controlled by the diaphragm lugs and the location in the piston and the main body

 

Pete

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With top cover off look down the sides of the dashpot , the bottom of the piston has two holes in it either side and behind the needle these should be towards the engine side not facing anywhere else

 

its controlled by the diaphragm lugs and the location in the piston and the main body

 

Pete

 

Ahh....so the diaphragm could have been fitted 180 degrees out I guess?!

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