Brother in law wants me to tear down and do the recommended 45 hour maintenance, is it really supposed to have conrod/main bearings replaced along with a bunch of other stuff at such low hours? If it was a 2 stroke maybe...

2005 EXC 450

thanks guys

tc

I have 198 hours on my 06 450 EXC and its still good as gold and making silly power. I will have to think about new cam chain, tensioner and maybe piston with rings soon but if it ain't broke.....

Oh hell no man! I would do a leak-down test and compression check before even thinking about tearing it apart. You should be able to get away with a mere valve check at only 45 hours. Even on my RC4 250sxf engine that I beat the living hell out of I never had to tear into the bottom end. I had it on the track at a minimum of 2 times a week sometimes more. Handful of races etc. These aren't those jap bikes.

I would assure him it is not needed. Invest in a leak-down tester and compression tester and check the valve clearences. (I may be thinking of the wrong bike but I am pretty sure that you need the slimmer adaptors to fit inside the sparkplug hole.)

If you do not have this tensioner I highly recommend getting one. Worth every penny. First thing I did to all of my 4 stroke dirtbikes.

a friend put one of those dirttrick's in and his timing chain snapped. first ride after.anyone heard of this? i think he installed it wrong. but i wasnt there.
08' 530xc-w

got 450 exc 09 model with 90 hard hrs riding on it don,t touch it if it,s not broke
also have dirt tricks tensioner which works well

Thanks guys That sounds more like what I was thinking. I'll check valves and perform comp/leak tests