- Joined
- Sep 26, 2007
- Messages
- 293

Ok, I admit it - I was a big time skeptic.
I had read a few posts here and there about using an inexpensive check-valve in the breather line from the timing case to the oil tank, which would supposedly help reduce pressure in the engine from slightly positive to slightly negative.
Sure, sure, and Santa is going to bring me all kinds of new chrome parts too.
But I was tired of the never-ending oil seepage from the base gasket area, and other mysterious sources that I could never seem to really pin down, so I decided I didn't have much to lose, other than a few bucks. I bought two of the recommended check valves
1) the Motormite/HELP 80190 check valve (I paid $2.54 from an online auto parts supplier)
2) the Yamaha XS breather PVC valve (part # 15-0677 from Mikes XS, cost = $15.00)
I didn't have a convenient place to mount the Yamaha breather valve, so opted for the simpler inline installation of the plastic Motormite check valve
Much to my delight and surprise - the oil seepage stopped! Amazing! I am now a believer.
Now I'm ready to tackle that mysterious leak from underneath my primary case somewhere....
Hey, I wonder if this same check-valve approach would work for Triumphs. I was at a little event this week with about a dozen old Triumphs, all of which had been washed and polished that day, and all of which had fresh oil oozing out various orifices from the head on down. Should somebody tell them?
Keith - oil free in Encinitas
I had read a few posts here and there about using an inexpensive check-valve in the breather line from the timing case to the oil tank, which would supposedly help reduce pressure in the engine from slightly positive to slightly negative.
Sure, sure, and Santa is going to bring me all kinds of new chrome parts too.
But I was tired of the never-ending oil seepage from the base gasket area, and other mysterious sources that I could never seem to really pin down, so I decided I didn't have much to lose, other than a few bucks. I bought two of the recommended check valves
1) the Motormite/HELP 80190 check valve (I paid $2.54 from an online auto parts supplier)
2) the Yamaha XS breather PVC valve (part # 15-0677 from Mikes XS, cost = $15.00)
I didn't have a convenient place to mount the Yamaha breather valve, so opted for the simpler inline installation of the plastic Motormite check valve
Much to my delight and surprise - the oil seepage stopped! Amazing! I am now a believer.
Now I'm ready to tackle that mysterious leak from underneath my primary case somewhere....
Hey, I wonder if this same check-valve approach would work for Triumphs. I was at a little event this week with about a dozen old Triumphs, all of which had been washed and polished that day, and all of which had fresh oil oozing out various orifices from the head on down. Should somebody tell them?
Keith - oil free in Encinitas