betarick Posted September 28, 2014 Report Share Posted September 28, 2014 (edited) Just split cases on a 125cc txt to change mains. While cleaning crank i have found 4 cork plugs in crank holes which where in a bit of a state! Whats the idea behind these and will there be any ill efect without them? Edited September 28, 2014 by betarick Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted September 28, 2014 Report Share Posted September 28, 2014 i think its for aerodynamics to prevent any unwanted turbulence or drag so to speak Quote Link to comment Share on other sites More sharing options...
dadof2 Posted September 28, 2014 Report Share Posted September 28, 2014 They are to reduce the volume of the crankcase so it pumps fresh mixture into the cylinder more effectively Quote Link to comment Share on other sites More sharing options...
betarick Posted September 28, 2014 Author Report Share Posted September 28, 2014 So do i need new cork plugs? seen plenty of other cranks without them! Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted September 28, 2014 Report Share Posted September 28, 2014 if they are damaged then yes and they are core plugs , vehicle engine re conditioners tend to stock them Quote Link to comment Share on other sites More sharing options...
copemech Posted September 29, 2014 Report Share Posted September 29, 2014 They may well be made of cork. And purpose is as Dadof2 stated. Ir they are deteriorated you will either need to find fresh cork to press in or remove them. I kinda doubt there would be a lot of difference in performance. Balance is not greatly effected with the light cork, and I believe many sizes can be had from hardware vendors right along with the rubber bung plugs. Quote Link to comment Share on other sites More sharing options...
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