Stalls when coming down from revs

[Dave]

What bigger/better delivery  valves  could I fit?

It's an 11mm pump btw

i don't think delivery valves make a diff tbh

although terrano II valves are slightly less of a restriction - if they are a restriction at all that is.

Delivery valves made a huuge difference to me, the stock ones have a super pissy channel down the side, where as 11mm transit / DI / custom ground ones that have more meat taken out the edge flow much better.

Grinder + stock valves, shave them back but leave the sealing surface on the front. Will try dig pics.