nuthin better to do than ask a question like that, here's how you check - get the bike real real hot and pull your pants down and sit yo *** down on it, then gently peal the skin off your head or *** and read the temp, wowowowowowowowowo, wow, this forum may be for metric's a real biker would never ask that question, hahahahahaha, poiling point is 240 degrees, throw some bath water on it

 

hmmmmm.....

I rekon, I might oughta chat with him too then....

 

I set the heat alarm on the Tmat to 285, I think this triggered by the engine temp sensor want to monitor in different temps traffic condirions, will mess around with it until I get a good feel where the temp should be for my bike as it runs hot on the base case.

 

couldn't get the readings today.
so cold out it killed the battery in temp gun.
Will try another day

 

i have the spark plug ring sensor on my 85 flhtc and it reads 350 degrees sometimes. most of the time i would say it's at about 320. it has been like that since it was new and the motor has never been apart.

 

I checked mine after getting home from Sturgis last year and being stuck in that traffic. HOT!! According to my T-Max head temp log, I hit 330 a couple of times.

 

My Thundermax came with default settings for the head temp alarm threshold set to 350, my currentlog data shows I have hit 305 twice,my log data got wiped out when I loaded the 4.5 firmware flash on 12-16-07. I only have 16 starts on this log apparently. My backup log file shows I hit 328 once. But most of the time my head temp is in the 240-250 range according to the logs.

 

Wow, 350 sometimes!

When I've looked at CHT sensors and gauges, found a dual gauge from an aviation source.Just didn't think that the movement would hold up in the fairing! Will have to look into the old style H-D setup or Dakota Digital CHT guages.

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In piston powered aircraft we use EGT mainly to adjust mixture as we climb and descend. On aircraft so-equipped CHT will also be referred to. As it related to CHT in aircraft, we can see 375-500 and EGTs between 1400-1450. Operating lower powered piston engines (under say less than250 hp) at the thumbrule 50 degrees rich of peak you will see 325/1350 CHT/EGT. Obviosly higher horsepower fuel injected engines allow more precise leaning and more accurate fuel flow metering than carburated aircraft. As you climb in altitude there is less oxygen but the air is typically cooler than down low.

One last thing to consider comparing air cooled aircraft engines to motorcycle engines is that aircraft engines are typically tuned to about one-half horsepower per cubic inch. A 180 hp engine is 360 cubic inches. That should give you some idea of how over-specced they are compared to motorcycle engines. A typical 180 hp engine will carry 8 quarts of oil.

Hope this answers your question regarding CHT on Harley Davidson motorcycles.

 

I agree w/PhilM. The bad part about it is the stock 08's are running 400 on the rear on a hot day!!! That's why Hd has a race tuner.