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resitant to petroleum products
Quote resitant to petroleum products. The answer to your question, may be that the commonly used lubricant, vaseline/petroleum jelly, is a petroleum product .So how come you don't use purpose built petrol pipe?
I think it looks pretty good and I now run clear line on all my bikes. I started making the switch after having carb overflow issues that turned out to be rubber particles from a disintegrating rubber hose interfering with the float needle.