G'day Folks, I have a sick motor and wanted to gauge some advice before pulling it apart.
The Background is-
Its a 2004 American Rocket with circa 40k miles on the clock,
Has not been ridden much the last couple of years and after 12 months sat idle i've pulled it out, stuck a new battery on it, Rebuilt the front shocks to change the oil and seals (and slung some progressive springs in there), fixed the oil reservoir leak and changed the oil and filters. I also topped up the coolant which was a smidge below min.
All good there.
The issue is-
When started the reservoir starts boil out of the relief pipe under the engine at around 95deg (according to my obd2 reader and app)
I've tested the coolant switch and it shows 2.45kOhms @22 deg so ok at cooler temps
I've tested the relays and it works, also swapped it and it still works
The fan never cuts in when the bike is running and i've had it up to 106 deg today with no fan cutting in. However if I use tuneecu to run a fan test then the fan spins up just fine. There are no error codes reported or stored and the bike runs just fine.
All of the pipes get hot as does the radiator so i guess the thermostat is working fine. That said they get hot long before it hits 88 deg on my ecu scanner.
Short of pulling out the temp sensor then i'm not sure what to do next, can't take it for its MoT test if it boils because they won't run it on the emmissions test or rolling road brake test if its whizzing boiling fluid out of the bottom.
Any anecdotes, suggestions or advice would be most appreciated.
12 years of ownership in, this is my first real Rocket issue, i don't seem to be able to find anything similar on the forums.