MOPED ARMY

That's more or less it. A hot engine will likely read a little higher then a cold engine due to metal expanding and sealing better.

You kick the bike over a few times to get the highest reading.

Once you've done this the gauge will slowly drop by nature of the imperfect seal of an engine, but it shouldnt hit zero any time soon.

125 PSI or so indicates a rather worn Express. 165-ish indicates an engine with very very little wear. 140 is pretty normal.

The lower you are, the more power is being wasted. On such a small engine, this is important.

An Express engine with no real scoring of the piston wall or cylender can show a bit of a boost from the lightest of hones and new rings.

If your bike is really high miles or badly scored though, this way probably isnt for you.

There are a few kits for the Express, but I've never used any of them.

Things to remember about them though is that you WILL need more oil then the oil injector provides, and you will very likely need to re-jet your carb. Most Express carbs dont have swappable jets, so this may be difficult.

The direction I'm going is a somewhat modified Urban Express engine bolted up to an Express frame. Do a search on this forum for my username or urban express or some such thing and you should find all my posts on the topic.