What do i hook the vent up to in the fuel tank and what do i hook up to the crankcase breather nipple?
thanks for the help.

The vent usually gets a line from the pressure nipple on the fuel tank.

The breather you can just run a line out the bottom of the plane or somewhere its not going to make too much of a mess.

As has been stated, the fuel feed and pressure lines hook up just the same as a 2-stroke.

4-strokes have an extra nipple, usually on the bottom of the crank or in the rear cover. When a 4-stroke is new and you are running slightly rick, a lot of excess oil will drip out this line. Do not put the line back inside your plane; vent it to the outside. It gets pretty sloppy until the ring seats well.

A few of the newer 4-strokes have the crankcase vent tied to a new nipple on the intake tube between the carb and the engine. The excess oil is run through the engine for extra oil when it is new. After the engine is broken in, you hardly get any oil.

I have several 4 strokes (Saito and YS). I think you should know also. A 4-strk YS engine does not have a pressure nipple on the exhaust tip nor does it have a crankcase pressure nipple on the bottome that removes excess oil. This motor uses crankcase pressure to basically Supercharge the fuel into the engine at higher than atmospheric pressure. A normal 4 strk puts 3-4 lbs of pressure into the tank through the pressure nipple, but a YS puts about 9 lbs of pressure into the tank. I wrap my fuel tanks in high strength packing tape with the string embedded in the tape to keep the tank from exploding. YS engines are a little different than your average 4-strk and cost more, but the performance aspect of the engine is second to none. The plumbing set up for a YS is a little different also as you have to use a one way valve for the pressure line and release tank pressure before you refuel or defuel. If this isn't done, the pressure will give you what is known as a YS bath as the tank will try to empty itself onto you from the 9lbs of pressure in there.

Example: my YS .91FZ is compariable to if not stronger than a Saito or OS 1.20 and my YS 1.10FZ is compariable to a Saito 1.50 in performance.

Here is a photo of my YS 1.10FZ with the plumbing. Looks like Frankenstien with all the tubing going everywhere, but there is some order to the caios.
http://derrick.myphotoalbum.com/view...album02&id=acv