New large valve head, which jet size?

[theswede]

Hi!

I have replaced my 72cc cylinder and head with a new 72cc set I got from Autotech355 (this kit: cgi.ebay.com/ebaymotors/80cc-kit-Linhai-Vento-Baja-Roketa-GY6-50cc-QJ139QMB-_W0QQcmdZViewItemQQhashZitem4cf55b0f6aQQitemZ330533900138QQptZMotorcyclesQ5fPartsQ5fAccessories), and now I need some advice on jetting.
The old head had standard valves, and I ran a #92 jet in my 20mm carb with that. The intake port on that head was 17mm.
On the new head the intake port is 22mm and I am using the same carb, but with a new 22mm intake manifold.
The engine starts easily and idles, but if I give it any throttle it dies. To me that sounds like a too small jet, and I would appreciate advice on what size to try instead of the #92 currently installed.

[90GTVert]

I think you'll need to check over your all circuits. Pilot, needle, jetting. Probably will need to go up a little on the main jet, but if you can't touch the throttle without it dying, you've got bigger problems. Check for air leaks too.