Maintenance & Technical > KX450F / KX250F

450F Maintenance?????

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hughes:

--- Quote from: don46 on March 28, 2007, 06:35:26 AM ---It really depends on the type of riding your going to be doing, if you plan on racing MX then by all means go 4t otherwise you'll get eatan alive, if its trail riding go 2t. As all the post state there are many more moving parts in a 4t, I've had 3 250f's, mainly because you can't compete on a 125, My son prefers the 250 2t and as such we decided to not get a 450 last year, however this year we did get the 450 to level the playing field. I haven't had 1 bit of trouble with my 4t, I change oil/filter frequently as well as the air filter after every ride, pistons are changed about every 1-2 months and I install the heavier valve springs right from the git go. I do the same maintenance on the 2t also.  I'm on the extreme end of maintenance, you would be somewhere in the middle, most people don't change pistons but once a year, change oil, adjust valves  and enjoy, the 4 t are a blast to ride.

--- End quote ---

How often are you replacing valves,cutting valve seats,valve guides,cam chains, etc.?? Or you have not needed to perfrom these repairs at this point.

don46:
I haven't had to do any of these, but I only keep a bike for a year. Even the bikes I've sold are still around and have not had to have the valves ground. The key is to install the heavier valve springs, this eliminates float and damage to the seats, the other element to long valve train life is a clean air filter, if any debris gets past the filter intake valves fail prematurely.

CLAYTO:
Thanks heaps everyone!
Sounds like 250 2stroke is definitely the go 4 my budget.
Thanx for ur help
CLAYTO

hughes:

--- Quote from: don46 on March 28, 2007, 09:13:06 AM ---I haven't had to do any of these, but I only keep a bike for a year. Even the bikes I've sold are still around and have not had to have the valves ground. The key is to install the heavier valve springs, this eliminates float and damage to the seats, the other element to long valve train life is a clean air filter, if any debris gets past the filter intake valves fail prematurely.

--- End quote ---

Any carbon build up on the valve stems or faces??

don46:
nope

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