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VStar650CL »
https://forums.nicoclub.com/vstar650cl-u299034.html
Mon Dec 28, 2020 7:24 am
You won't hurt anything by using a thin film of sealer on the 'stat housing side, but never seal the block side. That pretty much goes for any gasket on any engine. It's okay to lightly "oil seal" the block side if the gasket is paper, fiber, or cork. A light coat of vaseline is okay if it's rubber or steel. Make sure the bypass hole (burp hole) in the 'stat is at the 12 o'clock position when you install, otherwise you may have problems bleeding air from the system.