Advancing Valve Timing

[sirsprinter]

advanced the valve timing on my 5K by 2 degrees,

 

but when the secondaries open, it seems to deadfire? Valve springs can't kee up maybe? *shrugs*

 

its not the accelerator pump or the weber (32/36) itself, as theres plenty of fuel, and air, and all the vavuums are in tact.

 

Theres plenty of spark too, as we have trialed and errord almost everything that comes to mind... we think...

 

i need to post audio of what happens, but under high revs, or planting the foot, it seems to deadfire, or choke? And we

 

can't workout whats happening. Maybe the standard valve springs can't take the load? Or what another mate suggested is

 

my exhaust isnt sufficient to accodomate the changes, as I'm running standard ex mannifold?

 

Any ideas or pointers from superior tinkerers/mechanics?

 

Cheers guys

[coln72]

so it has a flat spot when you crack open thottle. Wont be valve springs.

 

Is it over fueling? Managed to tune this out of mine by stuffing around with the accelerator pump linkages but this was on a standard carb.

[sirsprinter]

yeh, we took the weber apart, cleaned eveything, checked eveything. We took the chain back to bring it to original timing today, and everything worked 100% again. So were leaning towards the exhaust suggestion? or the original idea of the secondaries..

 

Any other ideas?