alpthusiast Posted April 27, 2021 Report Share Posted April 27, 2021 Any of have experience with an air leak like this on a 4spd Bultaco ,base of the cylinder, I’ve already replaced the gasket with fresh yamabond to little improvement.5psi drops to 1psi in 5 minutes.Thanks!🙂 Quote Link to comment Share on other sites More sharing options...
bullylover Posted April 27, 2021 Report Share Posted April 27, 2021 Get rid of the sealant and replace the base gasket. Make one if you are that way inclined. They are easy to make or just splurge and buy one! Quote Link to comment Share on other sites More sharing options...
alpthusiast Posted April 27, 2021 Author Report Share Posted April 27, 2021 Thankyou,The original was lightly greased.I carefully cleaned everything and installed a NEW gasket with Yamabond to try and eliminate the possibility of a leak there.Still leaking.I’m suspecting some porosity as I have found two tiny pinholes in that leak in the casting itself since posting this. Thanks!🙂 2 Quote Link to comment Share on other sites More sharing options...
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