Squeezing more power out of an already maxed out 11mm bosch pump

[zx_volcane]

Could you elaborate on the advance piston grind please

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moving the cable clamp fitting closer to the pivot will change the ratio.

Cheers, did that last night. It catches on the stop lever. It's at a funny angle cos of the boost pipe

You can remove material from one end of the advance piston to enable it to move further and gain more advance - although tbh without a test bench you don't know if you're getting full advance as it is.

There are advance piston cover spacers available off the shelf which achieve same.

Roller wear on the case can be an issue too if you push past stock and there are grooves in the pump you can wind up with the cage getting stuck.

You're in the dark though with these mods as to what you're gaining, what they're doing - without a test bench.

Same with any lever / lda mods - bit too heavy with the grinder or in the wrong place and you will loose control of idle, or smoke control ..etc ..etc

Not convinced on DV valves, don't think they're much of an issue on IDI motors.