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Old 01-23-2013, 11:38 AM   #11
Joined: May 2007
Location: North Island New Zealand
Oddometer: 57
The standard o ring for the tube to water pump connection is 25* 3. these dimensions are metric. If you have wear in one part you could try a 1 inch * 1/8 dia o ring. The 1/8 o ring is very slightly larger in diameter and the o ring is is slightly longer (25.4 mm) so you are stuffing a little bit more rubber in the hole which may make the difference.
I have reguarly made o rings using o ring cord, a sharp knife and instant glue. Got me out of a hole a few times at work but really only works best on larger diameters. On smaller diameters it is hard to get an aligned joint in the o ring.
I am not suggesting that you tear down your non leaking bike to try this out though.

All opinions are given with no warrenty, expressed or implied!!
murphyKTM is offline   Reply With Quote