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1.6 rad cap 08 yz450f

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Hey everyone so my assuming original rad cap is worn it's a 1.1 and it's only holding 7-8 psi if it gets any where close to 15 it blows the pressure out. Bike was getting a little coolant out of the rad. I have read a couple people saying they use a 1.6 cap wanted some input.

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I ran a 1.8 on my 2012 WR450F for 2 seasons with banged up radiators with no issues.   Works better than magical coolants because conventional coolant is a better conductor than them.

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