Maintenance & Technical > KX450F / KX250F
KX450F vs. KX500
don46:
--- Quote from: BDI on April 30, 2008, 12:33:45 PM --- . 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.
--- End quote ---
Bigbellybob do you remember this statement, the one I was referring to?
You and others have had bad experiences with the 4t, thats to bad, I think they are good bikes and are alot of fun to ride, but at the end of the day it's to each his own. I find people either love them or hate them, I ride only KX's so I can't talk about other brands, but I'm sold on them. They have not cost me a dime, other than PM's, now having said that they'll probably both blow up tomorrow
bigbellybob:
don46 yes i remember i just quoted it 2 posts ago. and that's my point i think it was $80 a valve, that's some costly PM's. i really hope your bikes don't blow up tomorrow. i was on the fence for some time and was really thinking of getting a new 4t but found that i couldn't afford to pay the payment and still pay for the PM's. the power that the manufacturers are getting from these new 4t's is unbelievable. 15 years ago no one would have believed you if you told them a 450 4t would put it to a 250 2t. i really believe that the 2t and the 4t have switched roles in the reliability department.
Good:
I'd like to ride a 450 just to see the difference.
Actually HOW different is the 450 from the 250 2stroke? Truly, does the 250 not compare powerwise?
I rode a 250 4 and it was weak, but haven't thrown a leg over a 450 yet... I was very impressed with the rear shock on the bike at the time, though. It was a Suzy from around '04 or '05.
If I had the money, KX500AF... I'd even be happy with the ATK700... dreams...
don46:
In a drag race I don't think the 450 is faster than the 250 2t, the 4t puts the power to the ground better and has better low end torque, but if you can twist it and hold on the 2 t will climb with the 4t.
I'm not necessarily a 4 stroke guy, I have 4 2t and 3 4t and have bought a new 06 250 motor off ebay that I'm going to big bore, who knows maybe that will be the ticket, the chassis is great, I don't like the power delivery of the 250.
the other conclusion, nothing is cheap anymore, diesel fuel is $4.20 a gallon and probably more in other parts of the country, if you wan to play, you've got to pay.
bigbellybob:
yea racing ant cheap. i think the 450 has a big advantage over the 250 2t. they have more torque and that's why they put more to the ground and most make more peak hp too. but with the 2t getting back some of the cc advantage they are bridging the gap. the new ktm 144sx is a good example. it is not winning a lot but is very close.
http://www.motocrossactionmag.com/ME2/dirmod.asp?sid=&nm=&type=news&mod=News&mid=9A02E3B96F2A415ABC72CB5F516B4C10&tier=3&nid=350AB56EC8BB41F49929CD8E1737A06E
i think we could see a ktm 285sx next.
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