Petroleum based stuff will cause it to dry out and crack faster, I'd suggest silicone based.Randy S said:Yes, I have. I bought some oem ones from ronayers.com so I didn't look for a cheaper replacement. I put a small amount of vaseline on the outside of mine last time and it seems to be helping.
I'm not sure if mine are really drying out. I tend to do carb syncs pretty regularly and I think taking it off and putting it back on repeatedly may actually be causing the problem. I think I'm going to extend it and use a valve of some sort on the end next time to make it easier to do the sync and to help eliminate this problem.