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Author Topic: k5 fuel octain  (Read 19506 times)

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Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #15 on: January 12, 2015, 02:24:21 PM »
ahhh, excellent!...I didn't realize you already had the rebuild fully underway! :-)
have you chosen/purchased a piston kit yet?
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Offline motovet

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Re: k5 fuel octain
« Reply #16 on: January 12, 2015, 02:29:18 PM »
All oem parts including gaskets, the cylinder is in at millenium(??? spelling) getting done. I sent the new piston with for sizing.
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Offline reklessj

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Re: k5 fuel octain
« Reply #17 on: January 12, 2015, 02:45:45 PM »
Quote from: motovet on January 12, 2015, 02:19:49 PM
I have the pictures figured out now. will post more of the head and spark plug shortly. Rekless, there is not many trails here so I usually go to upper michigan to trail ride. If your in the are though, I have a could show ya some of the mx tracks. Foxx, I am not sure what the last owner ran, I found it online down in Florida. An older guy had it along with a couple other ones and did not ride it much. I do have the tools to do a compression and leak down test, I will do that as soon as I get it back together. I have the cylinder in getting replated right now, it had some scoring and the intake bridges were cracked sooooooooo as long as it`s apart......
Right on moto I will let ya know as spring nears. I'm down for any type of riding. Also final ddestination is Mellen, wi , about 1 hr from Ironwood, mi
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Offline DoldGuy

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Re: k5 fuel octain
« Reply #18 on: January 12, 2015, 03:44:17 PM »
Motovet,

Looking at that piston would have me thinking possible head gasket leak as the intake side looks washed & could also lead to detonation. Most pistons that I have seen detonation marks are on the exhaust. Be sure to lap your cylinder and head together & as Fox noted leak down test.

DoldGuy
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Offline motovet

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Re: k5 fuel octain
« Reply #19 on: January 12, 2015, 05:32:05 PM »
doldguy,
 Not to sound ignorant, but when you talk about lapping to head and cylinder, wondering if their is something I don`t know about? I have always checked them with a straight edge or used fine sand paper on a good and flat piece of steel to check the head for warpage. Is this good enough or is there more I should be doing?
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Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #20 on: January 12, 2015, 10:10:04 PM »
Quote from: motovet on January 12, 2015, 05:32:05 PM
fine sand paper on a good and flat piece of steel to check the head for warpage.

you've got the right idea, sandpaper can and will work fine providing you're careful, but one of our Administrators suggested using this over everything else, and it works great and fast...



you can lap them on just about anything, providing whatever you chose, is flat...
I do mine on a 20"x20" piece of mirror in a figure 8 motion.
« Last Edit: January 13, 2015, 10:58:19 PM by Foxx4Beaver »
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Offline motovet

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Re: k5 fuel octain
« Reply #21 on: January 13, 2015, 12:37:17 PM »
Thank you, I will try that. Never thought about using a piece of glass or mirror, I like that idea.
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Offline DoldGuy

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Re: k5 fuel octain
« Reply #22 on: January 13, 2015, 02:15:38 PM »
If you still have the head gasket visually inspect it for signs of where / if it was leaking. Dykem is another great way to "see" the low/high spots on both the cylinder or head. I have a big piece of scrap granite to get the parts flat & every KX500 head that I have checked was nowhere near flat, cylinders too.

DoldGuy
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Offline motovet

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Re: k5 fuel octain
« Reply #23 on: January 13, 2015, 02:45:50 PM »
Thank you, I will make sure I check it over good before putting it back together. I am not sure where to get the time saver compound but got some permatex brand valve grinding compound today, guessing that should work fine?
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Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #24 on: January 13, 2015, 02:55:03 PM »
you can get the Timesaver here...you want the yellow label-100N
the 1lb can will last you a while...

http://www.ws2coating.com/timesaverlappingcompounds.aspx

I'm sure you can find it elsewhere too if you shop around.
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Motorrad

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Re: k5 fuel octain
« Reply #25 on: January 13, 2015, 04:18:44 PM »
Valve grinding compound is bad.
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Offline sandblaster

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Re: k5 fuel octain
« Reply #26 on: January 13, 2015, 04:27:02 PM »
Quote from: motovet on January 13, 2015, 02:45:50 PM
got some permatex brand valve grinding compound today, guessing that should work fine?

NO!!!!!! DON'T DO IT !!!!  :-o
You will embed grinding compound into your aluminum.
What happens when your engine heats up and vibrates and all those little embedded particles come loose and start floating around in your engine?
Time Saver is what you need...
That stuff is amazing...
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Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #27 on: January 13, 2015, 09:59:16 PM »
Quote from: DoldGuy on January 13, 2015, 02:15:38 PM
Dykem is another great way to "see" the low/high spots on both the cylinder or head.
DoldGuy

+1....I use a black Sharpie.
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Motorrad

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Re: k5 fuel octain
« Reply #28 on: January 14, 2015, 07:19:49 AM »
Just rub some duck butter on it. 
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Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #29 on: January 14, 2015, 07:44:34 AM »
that just sounds gross.
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Excuse me, ma'am...but you've got extremely nice legs!!!...what time do they open???                                                                                                               https://www.youtube.com/watch?v=n8tCgN3aryQ
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