How hot should a waterbox get?

RN SJ with stock waterbox. B pipe w/ flow control valve. Pipe is hot to the touch but doesn't sizzle. I do a 50/50 mix of extended wide open riding with low speed playing around. Seems like mine is hotter than it should be. How hot should a waterbox be; cool, warm, hot to touch, too hot to hold hand on, or sizzle?


steals hub caps from cars
Site Supporter
at peace
The B-pipe chamber should sizzle right by the headpipe.
Your waterbox should not be hot at all.


Customizing addict
Macon, GA
Waterbox might be warm but that's the most any of mine have been. Sounds a bit like your flow control valve pressure might be set too high or you were idling for a long time prior to feeling it.
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