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View Poll Results: Cylinder Head Temp, What is too hot
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350 deg F
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24 |
32.88% |
400 deg F
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19 |
26.03% |
450 deg F
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19 |
26.03% |
somewhere over 500 deg F
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11 |
15.07% |

5th September 2018
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Senior Master Custom Bike Builder
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Join Date: May 2010
Location: Pottstown PA.
Posts: 13,431 Sportster/Buell Model: xlch Sportster/Buell Year: 1960
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thank you.
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72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
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6th September 2018
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Master Mechanic
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Join Date: May 2016
Posts: 275 Sportster/Buell Model: Sportster Sportster/Buell Year: 74
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Quote:
Originally Posted by 1Scooter
Actually, that's a Trick Question. It all depends on ambient temperature. Mineral or synthetic oil? Synthetic will not break down with the high heat as quickly as mineral oil. Here in Texas, it's damn hot in the summer so I run a Lockhart oil cooler. Helps keep the oil and head temperatures down to livable.
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My local harley dealer told me back in the 80s that sportsters run hot and the oil coolers sold are nothing but for show you would need a oil cooler 10 times as big as the cooler that wer selling at the time to do any noticeable difference in the oil temp.and not waste my money and use it to buy the best oil available.he did not sell them at the shop.
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6th September 2018
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Senior Master Custom Bike Builder
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Join Date: Jun 2008
Location: Cornelius, OR
Posts: 8,715
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That shows you how much some dealers know....
All of my HD's have an oil cooler.
An Ironhead is really an oil cooled motor with an air assist.
Ask a Shriner about an oil cooler!
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Ryder Rick "I don't lie without an alibi."
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6th September 2018
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XL FORUM LIFE MEMBER
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Join Date: Apr 2016
Location: Texas/Mexican Border
Posts: 2,576 Sportster/Buell Model: xls 1000 Sportster/Buell Year: 1980 Sportster/Buell Model #2: xls 1000 Sportster/Buell Year #2: 1983 Other Motorcycle Model: 1200 Chopper XL Other Motorcycle Year: 1990
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I know when mine is too hot.
It will run when I pull out the key and run till the float bowl empties.
Jila Bend Arizona was one place I experienced this over heating effect. No temp gauge.
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