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Old 12-17-2011, 06:31 AM   #5191
Mopowa
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Okay, so I just got my bike back together after having a blown head gasket. I got an early Christmas/Birthday present while it was apart, a Trail Tech Voyager(http://www.trailtech.net/912-704.html), so I installed it at the same time. I rode it for the first time this morning and I'm concerned about the head temperature. The oil temp is perfect, but the head temp got up to 370. I double-checked each sensor using my infra-red temp gun. I'm just wondering if anyone else has a device that monitors head temp at the spark plug and if so, what they see on theirs?
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Old 12-17-2011, 08:26 AM   #5192
Schrauberklaus
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Quote:
Originally Posted by Mopowa View Post
Okay, so I just got my bike back together after having a blown head gasket. I got an early Christmas/Birthday present while it was apart, a Trail Tech Voyager(http://www.trailtech.net/912-704.html), so I installed it at the same time. I rode it for the first time this morning and I'm concerned about the head temperature. The oil temp is perfect, but the head temp got up to 370. I double-checked each sensor using my infra-red temp gun. I'm just wondering if anyone else has a device that monitors head temp at the spark plug and if so, what they see on theirs?
Hi
I install beginning of this year a Ni-CrNi Thermocouple in the head cover to mesure the öiltemp. there.
On the pos. of the R Letter on the left side of the cover. There i mesure 136-140 °C with 80°C in the oiltank after the cooler . Thats after driving for one hour at 35°C air temperature
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Old 12-17-2011, 10:27 AM   #5193
sh0rtlife
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well with any engine the spark plug spot is going to ALWAYS be the hottest spot in the head but its really hard to say what normal is if the factory doesnt tell you lol.....if your worried try a colder plug ..but to be honest unless its a nitro rc engine id never measure an engines temp at the plug.......i measured my 500 in various places and at the plug your getting the same temp it was running..but you could easily drop 50+ degs just by what location your measureing
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Old 12-17-2011, 11:23 AM   #5194
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If anything, a colder plug will increase the localized head temperature.
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Old 12-17-2011, 12:21 PM   #5195
cyclewizard
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Quote:
Originally Posted by Mopowa View Post
Okay, so I just got my bike back together after having a blown head gasket. I got an early Christmas/Birthday present while it was apart, a Trail Tech Voyager(http://www.trailtech.net/912-704.html), so I installed it at the same time. I rode it for the first time this morning and I'm concerned about the head temperature. The oil temp is perfect, but the head temp got up to 370. I double-checked each sensor using my infra-red temp gun. I'm just wondering if anyone else has a device that monitors head temp at the spark plug and if so, what they see on theirs?
That's considered in the normal range of an air cooled cylinder head.
Air-cooled cylinder heads regularly see temperatures over 320F and it is these high temperatures that lead to cylinder head problems which can run the gamut of cracks, loss of valve seats, loosening of valve guides and so on.
It turns out that an air-cooled cylinder head has a wide temperature variation across the head during operation. The intake side of the head is seeing relatively frigid temperatures from the intake mixture while the exhaust side of the head is exposed to blast furnace temperatures. The result is a huge temperature differential between the intake and exhaust valve seats and its no wonder that this is the area where the majority of cylinder head cracks like I found on Mendoteachs motor I built for him.With an air-cooled head you will probably even see temps from time to time in the 450f range to 500f.....depending on air temps/ fuel octane levels/ and riding conditions.
An air-cooled head can go from 30f to 450f in a matter of 6 to 10 minutes depending on outside air temps..

look at the welded spot on the head of Mendoteachs motor I found when I was welding the big fins on it, I was sorta surprised to find this on the intake side instead of the exhaust side.....the crack ran all the way from the chamber to the corner of the cam chain opening and up the head.
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Old 12-17-2011, 12:42 PM   #5196
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Cracking between an exhaust seat and the plug hole doesn't seem to be entirely uncommon with the twin-carb heads, either.
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Old 12-17-2011, 01:50 PM   #5197
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Cracking between an exhaust seat and the plug hole doesn't seem to be entirely uncommon with the twin-carb heads, either.
Yep. My original XL600 head was cracked there.
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Old 12-17-2011, 05:45 PM   #5198
bdcorrigan
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I know its old but the bike looks good... then they have to go and tear it apart. Well I just wonder how muck they want for parts? I am sure not cheap!

http://eugene.craigslist.org/mcd/2697137000.html
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Old 12-17-2011, 06:01 PM   #5199
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That's just sad.
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Old 12-17-2011, 06:59 PM   #5200
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Originally Posted by bdcorrigan View Post
I know its old but the bike looks good... then they have to go and tear it apart. Well I just wonder how muck they want for parts? I am sure not cheap!

http://eugene.craigslist.org/mcd/2697137000.html
maybe you can buy the whole thing?..worth asking
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Old 12-17-2011, 07:55 PM   #5201
Mopowa
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Thanks for all the replies about engine temp. I am honored to have C-dub spill a bit of his wisdom on me
I guess I don't have much to worry about. I'm always a on edge after a rebuild. This new gadget just gives me more data to fuss over. Now I need to get busy building a rear rack!
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Old 12-17-2011, 08:41 PM   #5202
Carter Pewterschmidt
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That's just sad.
I've parted out an 86, but it was pretty rough. They're worth a ton in parts. Not quite as much as this guy is asking for them though...
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Old 12-17-2011, 08:51 PM   #5203
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I own a Mustang SVO, so I'm a little sensitive to parting-out perfectly good, complete vehicles, especially when they're not common to begin with.
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Old 12-18-2011, 05:30 AM   #5204
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That bike would be a great candidate for a restro, it looks to be all there and in good condition.
What a same like HeadTrauma said.....
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Old 12-18-2011, 09:55 AM   #5205
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Laugh I love this thing...

Hello fellow adventurers!

I am completely new to the bike scene. Ever since I was a early teen i've always dreamed of owning my own motorcycle...
Was best friends with the local motorcycle shop owner's son and rode with him every chance I got, which was pretty often..

Of course, parents weren't riders and were against me getting one cause ive fractured some bones while gaining some MX experience with my buddy...

Three days ago I was blessed with a great private seller who I found on CL...

I was like an 86'?!? For $2000?!?! Now effin way. BUT, I love Honda. I have an Acura RSX Type-S and I just love em'.
Great, reliable machines that are smarter than i'll ever be. So, I decided to look into this bike and wow. I was amazed and excited to find out this little gem was being sold. They just don't make em' like they used to...

So anyway, to make a long love story short, I called the private seller up, and wow... This guy was selling his passion.

Test drove it and here we are... I have her garaged up and at the top of my daydreaming list. (other than my fiance and baby muffin in her bakin, heh heh )

So the kicker to this little story is: The owner of the bike is ClayJars!!! A now, fellow inmate! The research I did for this bike wedged me into advrider.com and I was like, "wait, wait... Thats the bike im, whaaaat?!"


I wanna ride!!!!!!




So, hello everybody! I hope I learn a lot about maintaining this beauty here and i'm pretty sure I will!








V.I.P. Parking inside the office!
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