Piper 285

[Thundercat]

Hi guys, just purchased another R5 and trying to get the idle set up, but this engine has a piper 285 cam and the idle is as rough as hell. Only can get it to idle at 1000rpm if set a little to rich. What i'm interested in is what the best idle to run car at to get idle mixture set better. Any info appreciated thanks

[Mart]

Is it timed up correctly?

It's a 'hotter' cam than standard, so the idle is always going to be slightly choppy.

Likewise, it's fairly common to run a slightly richer idle afr.

[Thundercat]

Timing not checked to be honest, have run car for about a hundred miles from seller and runs sweet no issues when on the move. Just idle really crap, just need a bench mark for for setting idle speed at on this cam and then will adjust carb mixture and jetting to suit.

[Mart]

1k rpm is fine.