Crankcase Breather Hose

[BlitzenGruv]

I'm new to this particular bike, but the breathing is a big topic on the British bike forums. With those big twins, both pistons rising and falling together, crankcase breathing is very important.
In any case, I have some cracks in my breather tube. Sealed them with silicone, but I'll be looking to replace that tube. Had a look, and it seems like a bit of trouble to get to the thing. I am tempted to just put a filter on a short tube and block off the entry to the air box. Anybody tried this?

[Laitch]

I am tempted to just put a filter on a short tube and block off the entry to the air box. Anybody tried this?

This thread seems to have covered many reasons why that may not be a good strategy but nobody wrote that they tried it—you read all that, I guess. How about you do it and report back, BlitzenGruv? It would be a significant contribution to the body of knowledge here.

[BlitzenGruv]

Will do.
Before '74 Triumphs just vented the crankcase to the air. Starting in '74 they ran the vent back into the air cleaner to meet emissions standards. Absent a PCV valve, I can't see why routing the vent to air would cause any problems with this engine.
I will report back.

[rbm]

Try this thread:  http://k11og.org/forum/viewtopic.php?t=11285&highlight=crankcase+breather

[K1300S]

I'm new to this particular bike, but the breathing is a big topic on the British bike forums. With those big twins, both pistons rising and falling together, crankcase breathing is very important.
In any case, I have some cracks in my breather tube. Sealed them with silicone, but I'll be looking to replace that tube. Had a look, and it seems like a bit of trouble to get to the thing. I am tempted to just put a filter on a short tube and block off the entry to the air box. Anybody tried this?

New hose is cheap and it is simple to replace.  Just do it.

[Inge K.]

New hose is cheap and it is simple to replace.  Just do it.

Not on a 4V.

[K1300S]

Oops!  Missed the 4v part.  Still not all that hard.   Good time for a bunch of other maint while in there.   Fuel hoses,  intake boots, fuel injector cleaning,  etc.

Still think it should be replaced.   Good for another 10yrs.

[BlitzenGruv]

Thank you!
The link and the pictures are very helpful. It appears that it would be just as much trouble to modify as it would be to just replace the hose. I need to inspect the air filter anyway.
Now I just need to figure out how much needs to be removed just to get the airbox open. The factory manuals are a bit difficult to follow.