Hose to emissions canister (California 907)

[Kurt]

My 907 came from Cal, and the canister is long gone. And the mounting tab was crudely removed from the frame

My question has to do with the hose that is still there, attached to the hind-most spigot located right rear underside of the tank. Clamped midway in the length of hose is a plastic valve ("FIPSA" -- see item 9 on parts diagram 36 "California Version"), then the hose is just pointed to the ground ahead of the swing arm.

So, do I need this FISPA valve?

And what should I do with the hose?

OK, no obvious jokes HaHa

[paso750]

my 750 came from California as well. This is the label on the side, maybe it helps.

G.

[Finnpaso]

About label: They recommended already those times 20W 50 oil(!!!!!), what i have used succesfully about 6 years now... Shell Ultra Advance 4 fully synthetic....

[Laddie907]

Kurt

I expect the valve is like a PCV valve (positive crankcase ventilation) but for over-pressure (vapor return) in the fuel tank - so just an emission control device if fuel vapor is present.

the canister would do the work of the true PCV.

these mainly operate when there is increased pressure in the crank due to cylinder blow-by (leaky rings)
the idea is that the crank pressure is fed via the canister into the intake [vacuum] of the engine to be burned again...it's really just for emission control and does most work when the engine is worn. They are most effective at low throttle settings (high manifold vacuum).

a quick check on engine condition is to pull off a PCV and block the hole.
if there is positive pressure from the 710 cap (OIL) it is a sign the rings are on the way out.
if there is smoke emitted things are pretty sick.

something you need to check is that the inlet manifold tubes [as per diagram below] are blocked properly (but I guess if it was running lean you'd know by now)...

[Kurt]

Thanks, Laddy, that make sense, a fuel vapor vent valve. The bike runs well, but I wonder what would happen if that valve were plugged and stopped breathing. I guess I could just remove the PCV-like valve and vent the tank directly to atmosphere.

As to the intake tubes, I seem to recall that they are connected to one another now with a loop of fuel line, but I'll take another look.

[higgy]

most valves in this instance are in fact two way valves. They allow for the expansion and contraction of the fuel in the tank beyond a preset level of pressure,positive or negative. Their only purpose is to prevent damage to the fuel tank. The single biggest issue with this type of valve is for some reason spiders love to crawl up inside of them to lay their eggsacs. Once that happens the results is usually damage to your tank. If you dont have a canister you dont need the valve or any of the related hoses. Run a hose out the bottom of the bike away from the tire and any moving parts or better yet into a catch tank of some sort. Dont forget to block any ports to your intake. By the way, bevel heaven sells a very nice catch tank for this sort of thing for a couple of bucks.

[Kurt]

excellent -- all is clear now -- thank you -- and, OK, I see the bevelheaven catch tank, looks like a good way to go. http://shop.bevelheaven.com/detail.aspx?ID=697