Maintenance & Technical > KX450F / KX250F
KX450F vs. KX500
hughes:
--- Quote from: bigbellybob on May 01, 2008, 05:29:37 AM ---
--- 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.
--- End quote ---
I was just trying to add some humor. :-D :-D
don46:
honestly, it comes down to what you want to ride and what your willing to deal with, bottom line, they're all good, it comes down to personal preference. Admittedly a catastrophic failure whether 2 or 4 stroke would be expensive, reality is that catastrophic failures are pretty rare, and if its a new bike the manuf. usually takes care of it. As BDI said earlier, you have to do the PM, you do that and you have a pretty trouble free bike.
bigbellybob:
--- Quote ---As BDI said earlier, you have to do the PM, you do that and you have a pretty trouble free bike.
--- End quote ---
i don't remember him saying that. i do remember him saying
--- Quote ---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 ---
and saying
--- Quote ---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.
http://met-tech.com/motorsports.htm
--- End quote ---
BDI:
I have a honda CRF450x and It is easily the best bike I have ever owned. The freedom this bike gives me is awsome, I can leave my house and as long as I can keep linking gas stations I can ride forever no two stroke oil needed. I try not to kill my bike with maintenance, I don't clean my filter every time I ride, I don't power wash the hell out of my bike every time I ride, I do keep My valves adjusted, I do keep my oil toped off and I change It when I think It's been in there long enough. I also live life on the rev limiter and I will be changing out my valves when I notice the bike wanting valve adjustments to frequently. Because I do my own valve adjustments hopefully I will see that train coming down the track, no matter what kind of bike you own you should always keep your ear on the rail. :-D
bigbellybob:
i have a 07 yfz450 and it is easily one of the worst bikes i have ever owed. had to pull the cab 6 times just to get the thing so it would not die when you gave it the gas, this is new off the showroom floor. and when the time comes to pull the head i will be looking for a 2t to putt in it for the same price of rebuilding the head.
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