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This is my question actually......asking if running 154 degrees is normal for the CP3 or not.
It's normal when running in cooler weather.

I mean for all I know, the previous owner slapped in a lower temp thermostat and filled thebsystem with only water.
Nah, you can't replace the thermostat without destroying the housing it's in, it's not designed to be replaceable like that.

Any time you buy a used bike unless you know the owner well, you should always be suspicious of what's been done. People do stupid shit.
 

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Discussion Starter · #23 ·
It's normal when running in cooler weather.



Nah, you can't replace the thermostat without destroying the housing it's in, it's not designed to be replaceable like that.

Any time you buy a used bike unless you know the owner well, you should always be suspicious of what's been done. People do stupid shit.
Thanks, good to know and yep...people in general....are just not smart smh :rolleyes:
 

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My FZ always ran cooler in our "winter". I assume the air cooling was greater than the engine heating could deal with.

My air/oil cooled GSX1100G also ran cold in the winter. Getting off the freeway in February after a 15 mile run to work, the engine acted like I had just started it. Took another 1/2 mile at slower speed to warm up.

This is all normal. Sometimes there are just too many distractions on the dashboard
 

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2020 XSR9, Shock Factory M rear, K-Tech fork pistons
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My FZ always ran cooler in our "winter". I assume the air cooling was greater than the engine heating could deal with.

My air/oil cooled GSX1100G also ran cold in the winter. Getting off the freeway in February after a 15 mile run to work, the engine acted like I had just started it. Took another 1/2 mile at slower speed to warm up.

This is all normal. Sometimes there are just too many distractions on the dashboard
Also worth considering that is is a "guage" is is often heavily damped exactly for that reason - an undamped guage is a distraction but it still hasn't explained why the engine appears to run so cool. The only real way to measure the temperature would be an infrared thermometer when the bike is stationary or a mechanical thermocouple bolted to the engine casing CYLINDER HEAD TEMPERATURE GAUGE KIT, CHT. 10mm Fitting, 3M Length Sensor. 708747548921 | eBay
 

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Thank you - that backs up the fact the 'stat is on the return to the engine from the radiator side.
 

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I've seen temps go down to the 130's, riding in cold downpours. Thermostat only manages coolant flow through the radiator, it can't do anything about cooling done to the rest of the engine.

P.S. The Gen3's run a 175 degree thermostat, and it looks very similar to the one on previous bikes. It might even bolt straight up, don't hold me to that though...
 

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I put almost 80,000ks on 1 of my mt09s without any issues. About 80,000ks on the other 2 without any issues.
Is it cw with 160,000 miles on his?
whatever the temp, it works. Theres nothing to worry about.
If you want it to run hotter, cover up part of the rad. You dont need to, but if you'd prefer a hot engine, cover part of the rad
 

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Ok, but shouldn't an engine designed by Yamaha operate in a Window that keep it out of danger - Hi or Low?
It does. Yamaha are one of the foremost engine designers out there, and have been for decades. Look at the LFA V10, and the various others they have had design input with.
 

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My '16 stays in the 150's-160's when blasting down the highway in the summer time even when it's over 100° out. I too wondered if my flashed ECU was causing the bike to run cooler than it should as my stock ECU FZ07 stayed 20-30° warmer in the same conditions. But yeah, apparently this is normal for the CP3.
 

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Maybe Yamaha deliberately run it cooler to reduce the likelyhood of detonation. After all it's an fairly torquey engine with flat curve from low revs, it must have quite high cylinder pressures at low to mid range.
 

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Been watching different engine/injection cleaners and how they perform on Youtube. The ones I watched measured Carbon build up on the pistons with a small camera. Has anyone had a look at this kind of build up on the cp3-engine?
 

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Why? Some build up is normal, if there's a lot, there's a problem with over fuelling or oil burning.
 

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Engines are much cleaner now. When I stated my mechanics apprenticeship in 1968 getting a "decarb" at 20 or 30,000miles was normal.
 

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Beyond today's cleaner fueling systems, modern metallurgy and oil technology has helped a lot. Along with things like water jacket design/placement. When bores are able to stay round and keep crankcase oil out of the combustion chamber, carbon buildup is greatly reduced. Vehicles really are better than they've ever been.
 
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