Sometimes new stats are defective, too. Swap the stats and see if the heat problem moves to the other head.
I took thermostats out. Both bleed holes are open. I will run the motor tommarow with both hoses disconnected. And see the temps. If they run at the same temp, what would be the problem the thermostat? They both open at the same time. Ill check for closing temps also.i dont know what else it could be.Are you 100% sure both the bleed holes inside the thermostat housing are clear?
On initial start up the cold water has to be able to get out of each side of the thermostat housing so it can be replaced by hotter water from the engine, this hotter water opens each thermostat and once opened the flow is naturally maintained.
FWIW when my hoses are both disconnected the water flow and temperature at idle on muffs is equal from both hoses.
Each head should idle between 143 and 155. Once on plane, extra water flows thru the block and the head temps and go down as much as 20 degrees from idle temps. Possible the low temp stat may be stuck open.
Do you mean the low temp side thermostat is open when it should be closed?i checked the low temp side thermostat is not closed
I mean it was closed not stuck openDo you mean the low temp side thermostat is open when it should be closed?
That can't be good.
That would make sense. If the thermostat is stuck open, then that side of the block will get lots of cooling water. The stat should open at 143. If it stuck open, it may never get to 143.
If they open at 160, they are defective.
They both say 143 on the copper part. I got a kit so it came with purple relief springs. I will try switch the thermostats around and see if that helps...Get a magnifier and look on the thermostats, they should say 143, if not then get 2 genuine ones,
you asked what is the chance of 2 new stats being bad ? I have had 4 of them from the same batch being bad, they would not open even at 180c.
obviously I got my money back for the lot of them. I got these as a job lot thinking it was a bargain ha ha .
when you think about it there is less chance if you got 2 separate stats from different dealers, but from same batch they are liable to be both bad.
but it sounds like just one is bad, the low temp one is opening to soon.
Also did you change the relief springs ? new ones should be red in colour.
and when on the muffs do you get water coming out the two holes at the top of the mid section at idle ? if you do then its indication of stat opening too soon.
temp under 135 with infra red gun on top of cylinder block is far too low, that one side is opening too early or relief is stuck open !!!