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krt400ex
10-15-2008, 03:30 PM
fuggers, the bike chucked the top end yesterday. the ring pin popped and cause the ring to be able to move back and forth. the ring got caught in the exhaust port and put a nice gouge in the cylinder. totally sucks balz. its a $400 repair job. i have to get it repaired, a new nikasil coating, and then the piston and rings. im glad i can do the piston and rings myself, cuz the bill would be more otherwise. this is so aggravating
Pipeless416
10-15-2008, 03:32 PM
ouch.. so the clip got stuck or the actual wrist pin?
krt400ex
10-15-2008, 03:35 PM
there is like a pin in the ring...its hard to explain, but it bridges the gap so that the ring looks solid. that popped out which is wut ended up causing all the damage.
ZeroLogic
10-15-2008, 03:47 PM
I'm taking a swing and say your talking about your bike.:p

It would be worse though, it could of been a thumper.:chinese: Get some pics!
bean2080
10-15-2008, 03:49 PM
man that sucks something that small can cause all of that damage. too bad it couldnt of happened this winter so you could of had something to do in all the snow. i have been waiting on mine to blow up for a while now and it just wont do it, im tearing it down anyway this winter.
krt400ex
10-15-2008, 03:50 PM
Originally posted by ZeroLogic
I'm taking a swing and say your talking about your bike.:p

It would be worse though, it could of been a thumper.:chinese: Get some pics!


yea, its the bike. i knew it was gonna need a top end soon, but i was hoping it would hold out till the winter...didnt happen
Ruby Soho
10-15-2008, 04:41 PM
like zero said, atleast it wasnt a thumper!

thats one good thing bout them pingers.. topends are nothin!
pro-rider46
10-15-2008, 04:47 PM
haha, welcome to the club! sorry to hear about the bad news. i bought a crank, 12.5:1 piston and gaskets for mine today, and came to be 375, and all of them are new...
krt400ex
10-15-2008, 05:39 PM
heres pics of the damage. you can see the scoring in the piston, the missing piece of the ring, and the "pock marks" in the head and on top of the piston.

http://i168.photobucket.com/albums/u193/without_a_clue/DSCN3033.jpg
http://i168.photobucket.com/albums/u193/without_a_clue/DSCN3034.jpg
http://i168.photobucket.com/albums/u193/without_a_clue/DSCN3035.jpg
http://i168.photobucket.com/albums/u193/without_a_clue/DSCN3036.jpg
http://i168.photobucket.com/albums/u193/without_a_clue/DSCN3037.jpg
http://i168.photobucket.com/albums/u193/without_a_clue/DSCN3038.jpg
http://i168.photobucket.com/albums/u193/without_a_clue/DSCN3039.jpg
fastredrider44
10-15-2008, 05:57 PM
I'd almost bet you could buy a used jug somewhere just about as cheap as getting the sleeve fixed and nikasilled. Good luck, and welcome to the two stroke world.
pro-rider46
10-15-2008, 05:58 PM
i did a little researching for ya... 393.08, for cylinder, piston, ring, new pin, and bearing, and gaskets. from service honda...


130031356 RING-PISTON TOP $10.02
130011507 PISTON-ENGINE $49.13
130021099 PIN-PISTON $8.31
110051852 CYLINDER-ENGINE $293.05
130331057 BEARING-SMALL END $10.85
110601769 GASKET,CYLINDER BASE $6.79
110041300 GASKET-HEAD,T=0.26 $14.93

Totals : $529.98 - $393.08 YOU SAVE: $136.9
krt400ex
10-16-2008, 07:44 AM
thanks for looking that up. i am really surprised that you cant get everything including the cylinder for $400.

i was gonna send it off to Millennium Racing to get the cylinder fixed, and then get a wiseco piston kit. that would have cost me just under $400 as well. now idk wut i am gonna do.
ZeroLogic
10-16-2008, 09:33 AM
144 kit.

Go big or go home.:macho
fastredrider44
10-16-2008, 10:04 AM
Id rather try to keep it stock and therefor have cheap thrills. Don't need a big bore on a play bike. But thats just me.
krt400ex
10-16-2008, 10:48 AM
Originally posted by ZeroLogic
144 kit.

Go big or go home.:macho


i would love to do that, but i dont have that much $$$. i owe my parents $700 for car insurance in a couple of months. i dont even know when i will get this thing back together as of now.

anyone want to give me $400? :blah: :D
ZeroLogic
10-16-2008, 12:01 PM
Originally posted by krt400ex
i would love to do that, but i dont have that much $$$. i owe my parents $700 for car insurance in a couple of months. i dont even know when i will get this thing back together as of now.

anyone want to give me $400? :blah: :D

Pocket change!

I'm sure we can work up a deal.:eek2: :chinese:
krt400ex
10-18-2008, 07:56 AM
well, i decided to make it a winter project and throw a little extra $$$ into. gonna port it and mill the head for higher compression. im not gonna go high enough to need race gas though. you guys know how high i can go without needing to run race gas? i do run an octane booster already, so my octane is probably a couple points higher than 93
pro-rider46
10-18-2008, 08:04 AM
i really dont know how it all works out with 125 two strokes, but 450's are 12.5:1 is the limit for pump fuel.
S.A.J
10-18-2008, 12:28 PM
ive heard you can run a 50/50 mix of race gas and regular gas if you go higher than 12:5:1 i may be wrong though,i think i read that somwhere on this site sombody posted somthng like that i believe...if thats true i wish i would have known before ordering my 450 piston,that way youd be payn what,$5-$7 a gallon instead of $10 for race gas
KXRida
10-19-2008, 09:50 PM
12.5:1 should run fine on pump gas. The 08/09 yz250f's run good on pump gas at 13.5:1 stock. This winter I'm hoping to get an 08 oem piston for my 05 and jump the compression up a little more.

Check around on ebay as well. I found a cylinder for my rm on there way back when. Also, I don't think you can do a 144 on the older kx's. 134 is pretty much your max you can run safely.