250-500cc max bike temp

Does anyone know what the max operating temp should be for 09 wr 300

Hey Tim,

Not a WR300 but my TXC300 has seen a max temp of 279. I have a 1.6 bar cap and it was just barely boiling.

That is with the trailtech sensor in the crossover to the right radiator.

Later,

What temperature are you seeing?

These bikes are incredibly resilient. My 2006 WR 250 was run for over an hour in HS race practice conditions with no coolant. I pulled the cylinder to see if it was corked. I found no evidence of damage. That was 38 hours of use ago and it’s still running just fine.

With the trail tech sensor in the left side I have the yellow light set to come on at 200 and the red light set at 210. Climbing any decent hill they come on all the time, never boiling over. I talked with Kelly and he thought they read low. I have a infra red temp meter that I am going try so I can set it to account for the trail tech sensor.just looking for the max number.

Jake,
That switchback pic of FD is crazy, I would have needed my riding depends and a box of cleenex

That is perfectly normal. With the stock 1.1 bar cap, you are good to 228 without boiling. The 1.6 bar cap I have puts the boiling point at 235.

I wouldn't worry about anything until you are blowing coolant out.

That was a great set of switchbacks.

Later,

I put the sensor at the outlet of the second radiator where it goes back into the cylinderhead. If I'm moving at all it never gets much above 190 even if it's 100 degree ambient. Last weekend I rode some nasty single track, 90 degree ambient, slipping the clutch, dead uphill starts over roots and ruts barely moving and it got to 230 without boiling over. Cooled right back down once i got moving again.

Any thoughts on the best place for the temp sensor?

WR 300