XS650 help

jeffmack · Feb 22, 2012

hello all. Newbie looking for a bit of help with a XS650 install. My bike is a 75 MKIII, my question is where do I route the output from the XS650? should I attach a hose that returns directly to the tank just like the breather hose does now? or allow the Output to vent overboard? thanks for any help
jeff

pete.v · Feb 22, 2012

jeffmack said:
hello all. Newbie looking for a bit of help with a XS650 install. My bike is a 75 MKIII, my question is where do I route the output from the XS650? should I attach a hose that returns directly to the tank just like the breather hose does now? jeff

Yes, that is the general route. Some like to put it close to the crankcase to help keep it hot to fight condensation. Others put it higher to make a nice 90 degree out of it to make a nice install. When you ride, ride till it gets good and hot. This will fight condinsation also. 30 minutes minimum.

I do not know about the 75's but the earlier bikes had a reducer pipe that made the transition seamless on the output side. The input will slip right into the hose from the breather.

You can take the output pipe out of the valve with a twist of a channel lock. 1/4 pipe tap without drilling and find the adaptor to suit your needs at the hardware store.

jeffmack · Feb 22, 2012

Ok. Thanks, for give my ignorance, I am not familiar with PCVs and their operation. So the XS650 output (crankcase pressure) get routed to the oil tank? Thanks again

swooshdave · Feb 22, 2012

jeffmack said:
Ok. Thanks, for give my ignorance, I am not familiar with PCVs and their operation. So the XS650 output (crankcase pressure) get routed to the oil tank? Thanks again

Yes.

Guido · Feb 22, 2012

Here's mine routed from the timing cover to the PCV to the oil tank.

JimC · Feb 22, 2012

So the XS650 output (crankcase pressure) get routed to the oil tank? Thanks again

You are correct when you say the valve output (crankcase pressure) is routed to the oil tank. The PCV valve is supposed to limit this pressure as much as possible. The object of the PCV valve is to prevent air from being drawn into the crankcase during piston upstroke (compression and exhaust). Ideally, with no air in the crankcase there is no air to be pressurized on the piston downstroke (power and intake). Think of it as an inline one-way valve.

Jeff, I sent you an email which may help with the routing.

Niagara850 · Feb 23, 2012

Also the process of adding the XS650 PCV.

Guido: your pic is worth a 1000 words, did you remove the mounting plate that comes with it and leave it supported by the hoses?

Guido · Feb 23, 2012

Niagara850 said:
Also the process of adding the XS650 PCV.

Guido: your pic is worth a 1000 words, did you remove the mounting plate that comes with it and leave it supported by the hoses?

I kept the mounting plate on it. I just drilled a tiny hole in the air cleaner backing plate to accept the little tang on the mounting plate.
When the side cover is on you can't see the valve.

jeffmack · Feb 23, 2012

Awesome, thanks guys. XS650 is on, the one little leak I couldn't get a handle on is gone. Geeked up! Went for a 45 mile ride in the Georgia mountains, home without a drop.
Thanks y'all This board is great

JimC · Feb 23, 2012

jeffmack said:
Awesome, thanks guys. XS650 is on, the one little leak I couldn't get a handle on is gone. Geeked up! Went for a 45 mile ride in the Georgia mountains, home without a drop.
Thanks y'all This board is great

Contrary to what some here think, I maintain the Norton crankcase was NOT meant to be pressurized. You got it goin' on, Jeff.

hershey · Feb 23, 2012

I mounted the sx650 valve on my mk3 in the battery compartment. Take the battery out and cut the return oil line so you can mount the valve in the upper left corner as close to the oil tank and the frame without the valve touching either of the two. No need to drill holes as the oil line is stiff enough to keep the valve in place. Hershey

XS650 help

Similar threads