What's a clear sign an airhead is overheating?


10 replies to this topic
  • ghoti

Posted August 31, 2005 - 08:54 AM

#1

Are there any? I ride in stop and go traffic some days over 100º. I notice a slight decrease in power but that's it. Is there anything that means shut it down NOW?

  • TahomaTom

Posted August 31, 2005 - 10:45 AM

#2

Do you have a temp dip stick? I am no expert but that is what I go by. I give her a rest once it hits 290-300.

  • TimBrp

Posted August 31, 2005 - 10:47 AM

#3

The bike will ping like it's running on bad gas.

  • ghoti

Posted August 31, 2005 - 12:18 PM

#4

So it'll start knocking? Certainly not fatal. A harley (883 I think) passed me while i was waiting for the light yesterday and it sounded like there were a fist full of nuts in each cylinder :D I don't have a temp dipstick...290º is darn hot, what temp would the wrist pin seize. Anyone know what temp dino oil gets all gummy?

  • roadcam

Posted September 01, 2005 - 01:48 AM

#5

I read petroleum-based oils start breaking down at 300 degrees, synthetics at 600 - 700 degrees, ... and the split-second the oil film passes over a bearing journal, it hits 900 degrees ... dont know how accurate those figures are, but I found them on some oil maufacturers website a long time ago

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  • TREADMARKS

Posted September 01, 2005 - 03:01 AM

#6

My Harley will begin limiting the ignition cycles to help keep it cool around 260-270. It has happened once while stuck in traffic. I installed a jag oil cooler with two hi flow fans, and used a hayden solid state thermostat to control them. it has not been over 210 since. And it is hell hot here in Miami. I could always tell it was getting hot by the ticking noise coming from the engine. The hotter it gets, the louder it ticks.

My Honda is getting too hot after a 70-80 mph ride for about 20 minutes. When I got to work this morning, the ticking was pretty noticeable. It was too hot to rest my finger near the oil cap on the frame thats for sure. I know it is running too lean, and if my jets come in from carbparts.com today as scheduled, I will do the Dave carb jet mod tonight. Is it possible to install an oil cooler on these bikes? Where would it connect and mount? :D

  • Toolmaker

Posted September 01, 2005 - 04:33 AM

#7

A guy I work with has a XR250 and it has a nice small oil cooler on it from the factory , I bet if you checked one out you could put one of the on your bike without to much trouble.

  • ghoti

Posted September 01, 2005 - 04:45 AM

#8

Jags used to make an oil cooler that mounted up by the filler but have been discontinued. So I guess nobody has ever had a air cooled motor fail because of over-heating :D

  • Moredesert

Posted September 01, 2005 - 02:50 PM

#9

The bike will ping like it's running on bad gas.


That is what I was going to say. I rode an XR600 for years and pinging or hard to start hot when I fell or shut it down for a minute.

  • roadcam

Posted September 01, 2005 - 03:06 PM

#10

A guy I work with has a XR250 and it has a nice small oil cooler on it from the factory , I bet if you checked one out you could put one of the on your bike without to much trouble.



Scott Summers (SRC) sells the 400 oil cooler as a kit for the 600-650s ... a bit pricey, but its the only one left out there as a kit ... I have a streetbike oil cooler I was going to adapt, but haven't tackled it yet, haven't found a good place to hang it ...

  • mcd

Posted September 01, 2005 - 07:51 PM

#11

A guy I work with has a XR250 and it has a nice small oil cooler on it from the factory , I bet if you checked one out you could put one of the on your bike without to much trouble.

Friends of mine who all worked at a Honda shop rode XR600s with factory XR250 oil coolers on them. If'n I remember right it was a no hassle mountup.
And for the original question - - it'll start pinging.





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