Sc Fourstroke

Which engine do you have . . manufacturer and model number?

Maybe it's a female...............

Depends on that brand of engine you have. With my Saito engines, the third is for crank case vent. Some engines (older O.S.'s) had another nipple. Not sure what that one was for.

tippy

SC70 Fourstroke

Engine Link:

As tippy has described, a 3rd crankcase vent (open to atmosphere) nipple is usually located on the bottom of the crankcase. Where is the

4th nipple located?

Must be a milk cow...

Bill Fulmer wrote:

without any

My guess is that it has teh crankcase breather that plums into the intake port. Some of the newer OS engines have that. Keeps the oiling of the engine compartment to a manageable level.

Another configuration . . OS FL-70 Aeropressure system:

ASP FS 70 AR Series 3: "This is a new engine from China's longest serving engine manufacturer and has the latest type crankcase, with the timed breather exiting into the intake manifold giving the fresh fuel charge a slight boost, from the engines bottom end pressure pulses, It also redirects any unused oil back into the engine to improve internal lubrication, not all over the inside of your cowl."

The reason i ask is i have the pipes on the way that i would a normal engine (carb and pressure"exhaust") there is another pipe going from the crank case to a pipe branching of the carb which i have put another pipe. The problem is i can't seem to get any fuel from the tank to the carb and cannot get the engine to run is there anything i am missing on setting up a four stroke engine.

SC 70 Fourstroke

You might have the lines (pipes) from the tank swapped. One line is clunk/pickup line to provide fuel to the carb. The other is a pressure/vent line to your muffler tap. If these were swapped, you would have the pressure/vent line connected to the carb. Inside the tank, this pressure/vent line is usually plumbed to the top of the tank. The tank isn't completely full, you'll just be connecting your carb to an air pocket.

This is usually a simple mistake especially if you can't see the where the lines or coming from our your lines are the same color or are not marked to distinguish the difference. I usually use pink/red lines for the muffler line (pink - hot gas) and then I use a blue line for the fuel line (blue=cold fuel).

If that's not it, then the next step will be to hear how you are priming your engine.

tippy

Managed to get it going, runs like a wee sweetie now just perfect for my ultra stik.