Maintenance & Technical > KX450F / KX250F
KX450F vs. KX500
Texas Champ.:
Don , My friend rides for a Kawasaki house in N.W. Houston...They hooked him up and it didn't cost a penny except for service items like oil,filter and coolant.
My Husky 400 has won me 3 Texas vintage titles in 4 years in those 4 I've been through 2 piston/ring and bore jobs...I did replace the clutch because a the plates were aluminum and it required an oil change after every race..I have a full steel unit now and I can go 2-3 races on the same oil..the bottom end hasn't been opened in 4 almost 5 years now....Ahhh the good ol' days....km
BDI:
KXcam I hate to burst your bubble but crf450 and 250 and most modern 4t motocross bikes need valve adjustments all the time 100 hours is an astronomical amount of time expect your modern four stroke bike to go with out an adjustment. a lot of them need the valves adjusted as soon as they are broken in. I do valve adjustments on these bikes for people all the time. I did one yesterday it was an 08 crf250, it is the first bike this guy has owned in twenty years he's not exactly on the rev limiter all the time. The bike had three tanks of gas through it, IN valves were .003 and .005 EX valves were .009 and .009 spec is IN .005 and EX is.011 pluss or minus .001. Yamaha recomends a new piston and rings in their 4t every thirty hours alot of people put in new valve springs at the same time do to the fact they lose tension. Titainium valves like to lose their heads after so many hours regardless of how well you maintain your bike and should be changed out as prevenitive maintenance like two stroke pistons. I had valve seats cut by a local shop recently(Baker cylinder head) the guy was happy the head was not desroyed by valve failer like nine out of ten heads he does, that was his words. A lot of you will think I'm full of it and want to argue about the things I have stated and there will be no convincing you until the day it happens to you, alot of things in life are like that.
kaw rider:
on the yzf motor after 10 hour if you have to adjust the intake more then .002 you better get those valves out of the motor now. i never blow my yzf but i changed the oil evry race day and geared it right and it had 50 hour on it when i sold it and it was due for new valves.
GDubb:
--- Quote from: BDI on April 30, 2008, 12:33:45 PM --- A lot of you will think I'm full of it and want to argue about the things I have stated and there will be no convincing you until the day it happens to you, alot of things in life are like that.
--- End quote ---
How very true that statement is. I guess we are all like that to a certain extent.
-G
BDI:
I don't think that cleaning your air filter or changing your oil regularly can make any of us immune to these sorts of failures.
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