Thread: Possible Bad Riva Thermostat?
04-26-2009, 07:36 PM #1
Possible Bad Riva Thermostat?
I had an overheating problem on an RXPX. I thought it was a bad head gasket. I came to this conclusion when I saw the large coolant line that comes off the top of the head and goes to the top of the thermostat balloning very badly just giving it very little throttle. I figured boost was getting into the cooling system. I pulled the head and the gasket was fine it only had 30mins of use. I then thought that the thermostat was not opening causing the coolant line to ballon when I gave it throttle. I then checked the thermostat by submerging it in 175 degree water and it did not move. This is a Riva thermostat so I should have seen some movement. Has anyone else had this problem? Any opinions/suggestions?
04-26-2009, 07:59 PM #2
- Join Date
- May 2008
04-26-2009, 08:12 PM #3
- Join Date
- Jul 2007
My riva thermostat packed it in also.i bought the rotax racing one and have had zero issues.i think it is a much better unit.
04-27-2009, 03:33 AM #4
Bleed the air out of the system. Call me I will explain
04-27-2009, 05:12 AM #5
04-27-2009, 06:04 AM #6
- Join Date
- Jan 2006
had same problem went back to stock.
04-27-2009, 04:01 PM #7
So it has happened to people in the past. I guess I'll change out the thermostat. Any idea how to get the flange that you press over the billet nipple off?
04-27-2009, 09:16 PM #8
zach i got a spare stock tstat housing, already split open, and 160 degree tsat(new) ready to put in, i wont be at the shore this weekend, but the weekend after, if you are not in a rush. i'll give it to ya for what i paid for it all, i dont really need a spare, you could sell your riva(after you fix it) and save some money...
04-27-2009, 09:20 PM #9
my boy was having same issues with Riva T-stat, changed to rotax racing and walla bingo bango fandango!! Riva tried to say bad installation but that is such a load of u know what
04-27-2009, 10:46 PM #10
is the rotax racing designed different??
or just a stock housing with a lower temp tstat inside.
if its stock housing, how does it get the oil temps up high enough for proper lube...
when the stat opens at 131 isnt the oil gonna get cooled too much?
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