Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)
2006 kx500af Done Building, Needs Tuning
crooscroos:
Alright, so I tore the bike apart for my overhaul. I was going to get a compression release valve put on and the crank balance /trued. Unfortunately my air boot ripped where it attached to the carb. I struggled to get the carb to reach the air boot and, once it was connected, it probably ripped over time because of the constant pulling a stretching. I may need to re drill holes or make a new mount to fit another air boot :/
If you guys know anybody with another cr250 air boot please let me know.
It gets worse, I broke the bike in on the sand and to my dismay there was now sand in the air boot. I pulled the head off hoping for the best and sure enough my cylinder had small scoring and the piston had hundreds of tiny scratches. Looks like I'm out another bore job and a piston if I cannot salvage some life out of what I have.
Also, I put my cylinder base gasket on incorrectly. I believe my cylinder head gasket was on correctly but how do you tell? My base gasket was leaking a little coolant and looked awkward so it was obvious I went wrong there.
I feel a little incompetent after all of these discoveries but it's all part of the learning process :|
I may have to postpone my initial plans to fix the more basic problems.
sandblaster:
What year boot was used from the CR?
If your not sure, what are the number embossed on the side of it?
KZ3R - FITS 98-99 CR250 17253-KZ3-J00
KZ3T - FITS 00 CR250 17253-KZ3-J20
KZ3V - FITS 01 CR250 17253-KZ3-J30
KZ3W - FITS 02 CR250 17253-KZ3-J40
Small holes on the head gasket go to the right as you are sitting on the bike, or water pump side.
I've ruined a few good parts as well and probably will in the future so don't give up just yet :-)
Brute:
"If you are not making mistakes you are not doing much". EVERYONE makes mistakes. You got off fairly easy on this one and I would hazard a guess it will not happen again!
I look up most everything or keep notes so I do it right the first time as my memory has always been suspect. :-P
crooscroos:
I was using the KZ3T air boot from a 2000 CR250. I may need to look at a different air boot that comes off the air box a little farther so I won't have this problem happen again. Do you know if there is another boot with the same hole pattern that sticks out a little farther? If not, I may have to modify my air box again.
As far as the head gasket goes, I had it installed correctly. So I'm still concerned about my cooling issues. I know now that I was losing coolant from my base gasket but I'm not sure why the bike would be running at 237! I took the water pump off and everything looked good. I may have to rethink my radiator hose routing.
I really appreciate the support guys! :lol:
sandblaster:
Again, I'd pay close attention to your jetting before you play around with your hose routing.
Lean means heat....
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