weak points of the 4.0?

[5-90]

some people must like replacing the plastic surge tank on the closed system every two years.....not to mention its just another part that will leave you stranded on the trail.

Every five, and I keep a spare on hand. I've not gotten around to changing it out for a metal one yet - but Eagle has had good luck using a Moroso metal tank with a conventional pressure cap for the last several years.