Big Block tappet settings

Technical Frequently Asked Questions
1

Raceco’s advice on tapped clearances for EV era bikes is useful. The factory settings are to compile with noise regs.
From the Raceco website
Tappet clearances for two and four valve engines

Two valve engines

Tappet clearances for the Guzzi big twins should be set to 0.20mm for the inlet and 0.25mm for the exhaust. This also applies to the “modern” Guzzis such as the Sport 1100, Cali 1100i and V11. The factory settings for these bikes are 0.10mm and 0.15mm respectively, but this is to try and reduce engine noise to meet US emissions regulations. With tappets set this tight the engines have trouble ticking over and running cleanly at low revs.

2

ICEO, method. Inlet closing exhaust opening
Remove the rocker covers and plugs and put the bike in top gear. Roll the bike forwards until an exhaust valve just starts to open. Without moving the bike, set the inlet tappet on the same side. Next roll the bike back till the inlet valve just starts to open. Now set the exhaust tappet for that same cylinder.
Then repeat for the other side.
The alternative way is to set them at TDc compression stroke. Many people make the mistake of setting on the wrong stroke and end up with extremely loose tappets. With this method, you can’t get it wrong.