Maintenance & Technical > KX450F / KX250F
KX450F vs. KX500
don46:
I agree with most of whats been said, 4t are much more labor intensive and more expensive, what I don't agree with is the statement that after 35-70 hrs of use it's going to cost me 1/2 the cost of my bike to repair it .
Knowing what I know, I accept the fact that it's going to cost me more money to maintain and more time doing pm's, in return I have a bike that runs really well and can be competitive.
Even if we weren't using our bikes for MX, I'd still have one for a playbike as well as the the 500's, it is easy to go fast on the 4t.
Good:
--- Quote from: Texas Champ. on April 30, 2008, 11:24:07 AM ---Not everyone is mechanicaly inclined....I've seen guys that are A class riders but can't use a pair of pliers. They are left to pay shop rate for repairs.
--- End quote ---
Tell me about it! :cry:
bigbellybob:
--- Quote from: don46 on April 30, 2008, 10:54:04 AM ---This is totally out of hand, how often do 4t's blow up and need everything from cases up, not many that I've seen. Heads, yeah I've seen them crater, but again, most can be traced back to the maintenance or lack of. Knock on wood, I have not had 1 problem personally with any of my 4t's. These are not for everybody, but for those that race seriously, they are a must. I have both and like each for the application they are used, the other issues and it doesn't matter whether it's 2 or 4 stroke a person should learn how to repair them.
--- End quote ---
how often do 2t's blow up, i just put some numbers out there for comparison. my bike is a 98 and its only on its second piston still stock jug, head, and bottom end. and it gets rode hard, only seeing the upper RPM's most of the time. so the cost for 10 years of riding, it has had a couple air filters replaced, normal oil changes, 4 sets of rings, and 1 full top end with a new piston. and if my 368cc 2t @ 221lbs had 08 suspenders it would be very competitive agents the 450's and it would still give the 450 a big advantage in cc's. as the cc advantage comes down i think people will start racing 2t's, especially the amateur guys that don't have that factory money
hughes:
I don't own a 4t at this moment, but have ridden a few YZ450F'S and I'll be buying my first YZ450F this year. I ride and work with a group of guy's and all they ride is 4t and they never complained nor have I seen any failures on their bikes. I know 4-5 bikes is a small sample but I ride with these same guy's most weekends. My boy's 2004 Yamaha TTR-90 is going strong with no valve adjustments or top end failures. :-D :-D :-D
bigbellybob:
--- Quote ---My boy's 2004 Yamaha TTR-90 is going strong with no valve adjustments or top end failures.
--- End quote ---
i don't think that helps. the old style 4t's were very reliable, xr650's and stuff. i had a 200x that ran forever but that stuff don't count. its the new style 4t racing motors that have every part as small as possible to save weight, and pumped up passed the point of reliability in question.
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