Modern Vespa

I have a B8ES spark plug in. The timing is set as standard

I read on a forum people was recommended the timing to be set as standard. If that is wrong I will change it. The revs seem to be abit high when I go slow. Timing is out then

It is a bit lean by the looks of it. Try the 128 main jet. Need to hear how spluttery it is at 40mph

It looks like standard T5 timing is 16 degrees BTDC. If it was me, I would dial that down to match the Malossi spec. To be clear, this has nothing to do with how your plug reads. In fact, plug says timing is ok.

B8ES should be fine for riding around town. Not sure why ground strap looks so well-done.

If you have a different head like MMW or MRP you can run 17-18 degrees if your squish is set right. There is a decent amount of power in doing so. Don't try that if using the stock head and Malossi head gasket.

The head looks like a standard T5 head but it's been machine.

I have ordered an alloy degree timing disc so soon I get it I will set the timing. And il test ride it with a 128 main jet.

When you test ride the 128 main jet, if the 122 was ok, the 128 will only do 30mph wide open in 2nd gear.
See how you get on and take it from there.

Ignition timing at a genuine 16 degrees is not going to be any issue with a modified head.

so I don't change the timing then ?

Check it for accuracy. If 16 or less, I would leave it alone.

Sorry for the misdirection. I did not realize these kits do not come with a cylinder head. It makes sense that timing should be 13-14 degrees BTDC with a bone stock T5 head, but you can run more advance with a machined or an aftermarket head.

This could also explain why the B8 plug reads a little hot. With a machined head and advanced timing, you might want to try a B9 instead.

yes my head has definitely been modified.

I've been told different things here. The head has been machined for a malossi Vespa t5 so do I change the timing from standard or keep it as it is.

With the modified stock head, and assuming 16 degrees BTDC, keep it as it is. Sorry for the confusion.