Carb diaphrams

[Bugsy27]

Ive just recently picked up a 73 TC2500 fitted with CD150's. While giveing her a going over I found that 1 carb diaphram rubber was torn, so thru a local parts supplier I bought 2 new rubbers to replace them at the same time, but I found the rubbers to be 2 stiff, as after setting every thing up, if I lift the slide up to near the top the rubber inverts itself and the light spring tension wont push the slide back down. The slides move smoothly in the body and top so there is nothhing there causing the problems, so just wondering if anyone had a "good" source of carb parts or have any other ideas on how to solve it.

[dazzer]

Diaphragms good quality Burlen.co.uk. However could be misaligned. loosen the dashpot screws and the main jet housing below and gently tap it into alignment whilst moving the piston up and down. Just a thought, although you've probably got the later 150s fitted. Perhaps just try loosening the dashpots and seeing if the problem persists.

[Bugsy27]

Thanks have checked the alignment, loosened the screws on the top and problem still there, I'm pretty sure its the new rubbers at fault, they seem very thick compared to the original.

[dazzer]

Do sound a bit dodgy. Burlen are not the cheapest but you get what you pay for. I fitted early 175 CDs with new diaphragms from Burlen a couple of years ago now... No problems .

Cheers

[Lord Sorbington]

I got some from TD Fitchetts, no problems with them.

[Richard B]

Yes some of the repro ones are too stiff. I returned mine to the supplier.

The Burlen ones are fine, all flippity floppy  ;)

[Bugsy27]

Thanks for that guys, They certainly have a funny feel to them, if you insert your finger into the air filter end and lift the diphram you can feel a nice steady resistance to upward pressure ubto the slide gets about halfway, the the diaphram seems to "overcenrte" is self and the the slide shoots up to fully open. Ive ordered 2 new ones from the UK so see what happens with these.
Thanks for input