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Author Topic: k5 fuel octain  (Read 19516 times)

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Offline motovet

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k5 fuel octain
« on: January 12, 2015, 01:21:05 PM »
I found a few places where people have talked about what octain to run but I don`t know what, if any mods were done to my bike. Soooooo I guess I am looking for your opinion. I decided it was time to freshen up my ride since I have know idea of it`s history and when I pulled the head I noticed the piston looks like it may be detonating. I always run 91 oct. with kawasaki oil at 32:1 mix, all of the time on this bike is on fast trails and ice riding. The last time it was used was on the ice witch is usually more of a wide open type of ride. I would like to post two pictures of the piston and head but for some reason i can`t make it happen, i tried using the insert image with no luck. If anyone could help me with that also, it would be greatly appreciated. Thank you. it is a 2003
« Last Edit: January 12, 2015, 01:22:59 PM by motovet »
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Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #1 on: January 12, 2015, 01:24:35 PM »
you can use this for posting pics....
http://www.kxriders.com/forums/index.php/topic,10040.0.html

are you sure your jetting is adequately set-up for the colder air temps of winter and ice racing/riding?...you may just need to fatten it up a bit.   
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Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #2 on: January 12, 2015, 01:28:13 PM »
what year bike do you have?...and do you know your current jetting and ballpark altitude?
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Offline motovet

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Re: k5 fuel octain
« Reply #3 on: January 12, 2015, 01:38:08 PM »
The bike is a 2003 and i live in wisconsin at about 400 ft.
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Offline Candyman

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Re: k5 fuel octain
« Reply #4 on: January 12, 2015, 01:39:42 PM »
Jetting?
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Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #5 on: January 12, 2015, 01:40:52 PM »
Quote from: motovet on January 12, 2015, 01:38:08 PM
The bike is a 2003 and i live in wisconsin at about 400 ft.

do you know your current jetting?
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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

Offline motovet

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Re: k5 fuel octain
« Reply #6 on: January 12, 2015, 01:42:27 PM »
I am running
 pilot          62
 main          178
 air screw    1 turn
 needle        3rd
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Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #7 on: January 12, 2015, 01:48:18 PM »
you're plenty rich...how's the plug look...black?

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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

Offline reklessj

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Re: k5 fuel octain
« Reply #8 on: January 12, 2015, 01:48:58 PM »
Quote from: motovet on January 12, 2015, 01:38:08 PM
The bike is a 2003 and i live in wisconsin at about 400 ft.
You in northern Wisconsin?
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WIFES (Baby Fiver) rides: 2004 KTM 105SX,1992 LT250R, 1995 ZXI 900 JETSKI,  2011 RMK 600
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Offline motovet

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Re: k5 fuel octain
« Reply #9 on: January 12, 2015, 01:52:57 PM »
The plug is light in color, I live about 45 min south of green bay
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Offline reklessj

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Re: k5 fuel octain
« Reply #10 on: January 12, 2015, 01:59:41 PM »
Quote from: motovet on January 12, 2015, 01:52:57 PM
The plug is light in color, I live about 45 min south of green bay
Just wondering, I was born in wasburn and have family in Ashland  county. Was thinking bout a road trip this summer lookin for K5 riders along the way to show me local ride spots
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My rides: 1994 KX500, 1988 T4, 1998, ZXI 1100 JETSKI, 2003 MOUNTAIN CAT 900
WIFES (Baby Fiver) rides: 2004 KTM 105SX,1992 LT250R, 1995 ZXI 900 JETSKI,  2011 RMK 600
SONS ride: 1995 YZ125,2002 RM 250
other rides: 2007 RMZ450 RC Ediition, 2003 RMK700

Offline Foxx4Beaver

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Re: k5 fuel octain
« Reply #11 on: January 12, 2015, 02:03:51 PM »
for the plug to be light in color with that fat of jetting, you "could" have an air leak, causing it to run lean and detonate....
you could do a leak down test...but if you're already thinking about freshening up the motor anyways, I myself wouldn't bother until it was all rebuilt.
some guys like to do leak a down test before they tear a motor down, to find out if there's any areas of concern.
have you got the tools to do a compression test and leak down test?

do you know what the previous owner ran for fuel in it?
« Last Edit: January 12, 2015, 02:07:12 PM by Foxx4Beaver »
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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

Offline motovet

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Re: k5 fuel octain
« Reply #12 on: January 12, 2015, 02:08:41 PM »
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Offline motovet

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Re: k5 fuel octain
« Reply #13 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......
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Offline motovet

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Re: k5 fuel octain
« Reply #14 on: January 12, 2015, 02:23:02 PM »

The spark plug has one ride on it, about 2 hours of time. You can see the light pitting on the head along with the piston in the earlier picture.
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