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You can get a braided steel version. My CX has had 'em for years
Looking for the collective wisdom/opinions.The early big blocks loops didn't have the breathers lines from the valve covers, I believe they appeared with the tonti frame bikes.I can't imagine they do anything for crank case pressure with the big Breather hole in the back of the case, and I can imagine they breath buch considering its only going though a banjo bolt.I'm sure they put them in for a reason, but I can't quite see it..... Asking as I am on my 3rd set of Breather lines that keep coming apart at the crimp on my 850 Lemans, and thinking of just blocking them with a bolt in the valve cover.
Except when flapper valve stuck (got removed pdq, but first time it actually happened on my bike)
Is it absolutely necessary to have the flapper valve? My CX has been doing some weird breathing things, I looked at the check valve and itís fine and I considered the Agostini breather box but I donít want to spend $140 bucks for a non-racing bike.
No, break out flapper valve. POS, keep pcv, or better, use new late model one, with circlip, All will be good
Orig breathers in head became rocker feed cos of inner plugs.
Could you explain? I'm not following when you say they became rocker feed. Not familiar with the inner plugs either.
To have space for the inner plug it is common to move the rocker oil feed to the breather pipe position, as the standard feed runs right were you would like to have your spark plug. The original feed hole is blocked in some way and a new passage is drilled from the breather hole to the rocker oil feed.
Jackson...I'm a bit dense ....why would you eliminate the valve in the breather box or does having that and the ball valve allow higher crankcase pressures than good? I'm running both currently and to be honest am a bit lazy ...so convince me to get my finger out and disable it !!!
Thanks jackson...would you go to the trouble of getting the breather out and getting rid of the flapper???It does seem that I'm getting slight weepage from somewhere in the clutch after a complete rebuild and seal and it does seem to be engine oil...I did the epoxy on the cam plug trick and all the other recommendations, fresh seals obviously...wonderi ng if this "flapper " working might mean too much resistance to crank venting ?
The lines attached to the valve covers are to vent water vapor. They appeared on the Tonti-framed round fin big twins but were eliminated when the square fin motors arrived so maybe they were not very effective or necessary.Edit: LM3, Cal2, T5, SP2 and Sport 1100 do not have water vapor vents but all other square fin motors DO have vents at the top of the cylinder head.
My Cal 2 square-fin with NO valve cover breathers suffers from mayo, I find it whenever I take the covers off to adjust valves, and it POs me to no end that there are no vents. Mayo traps? I suppose, if they are too small diameter, but I'd rather have them as an ATTEMPT to vent the covers than no vents at all.[/quoteEasy to add if you want to, opposite logic to mine.Much written on here, search for pages and pages of mayo talk
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