Modern Vespa

Hi,

Just looking for help with my setup.

P125x
Polini 177
Ports matched
Sip road

20/20 with these jets

160/b3/118
48-160

Timing set to 18° Btdc

Hard starting, will only start with wide open throttle.
Boggy and four stroking like its rich...

Timing issue?

Thanks!

Fuel flowing? Jets clean? Gas good? Points gapped?

What's the plug look like?

Yes to all of the above^

It seems like it's rich. Haven't gone above half throttle, but that pilot jet seems towards the leaner end...
Mix screw about 1 1/2 out.

Points gapped at .38

Plug is a B8

Had to elongate slots in stator quite a ways to get to 18°

Seemed excessive to me, but it's the first time I've had to do it...

Rechecked timing...

I don't know what happened, but it was way off.

So I set it again, and it was a bit better, but it still is hard starting...
Had to kick it with wide open throttle. It's a bit faster, but still seems like 4stroking...

Hey i got the same set up, i got no idea what the time etc is but it takes 10 kicks from cold every time to get her going. One kick when warm.

october: We run a slightly leaner idle jet, but your jetting seems about right.

Have you checked whether the choke closing all the way? How cleanly does it rev out once it's running and warmed up? Does leaning the mix screw affect the throttle response?

You've said a couple of times you think it's rich...try smaller idle as per SoCal's suggestion and take the main down a couple of points.
Have you got the original mesh filter on the carb, and is the heart-shaped hole drilled out? That might also help

Original air filter
No heart drilled...

Drill baby, drill. Let it breathe.