[torinogt]

My 750 ACE would whistle also only when hot & at idle, as soon as you give it some gas it would go away.
Replacing the water pump fixed the issue, now I only run factory type coolant in my bike, as I believe the Prestone caused an issue with mine

 

[torinogt]

OK, I'll buy it. Now, tell me is that ambient like a heat wave, or in the fall, no snow yet but feels like. Should be any day the bike is at its full heat cycle, ambient does not matter. It's pick a day, month, etc.


Boy, I'm about to call that normal.


Let me get this straight... I'm thinking, no mechanical seal leak to change out the pump. No oil out the same seep hole being the pump shaft seal to water pump. And no coolant change back to the OE, and the jobber (prestone) they use in their bottles [assuming], but now the hindsight of not knowing if the coolant [alone] change would cure it?

And now we have rseneff with a 98, who knows how long that was changed, or prestone calls it, he changed up how long ago, rsen? What a time to find out. Past two years since last done, then off to a Honda dealer for a bottle or two, the junk science is on!

Just saying, does not go away with the coolant change, and no leaks/overheats caused by it(?), I do not ride idling. Get it! Normal.

Yep, when the engine was at it’s full heat cycle the water pump would squeal/chirp/whistle or whatever you want to call it at idle only, changing coolant back from Prestone to Honda did not fix the noise but replacing the water pump took care of it. Was it caused by using Prestone coolant? I can tell you the water pump started leaking 200 miles after switching to Prestone then eventually Edit: (slowed down to slight seepage from weep hole but not bad enough to warrant a replacement) , 25k miles later the water pump started squealing. So my personal preference is Asian formula or Honda coolant & haven’t had any issues with the new water pump for the last 45k + miles . That’s my story & if you don’t like it tough sh!t