i don't think the manufacturers are pumping out junk to keep service work up...... thats a bit out there..... i will say that the new 450's have been pushed a bit too far to try and make the needed power.... the new 450's are built like dirtbike engines (the YFZ450 is a dirtbike engine) they come out of the box with a high HP number but..... are not that modable... and for honda and yamaha to get these #'s they push the envelope a bit.... these kind of engine require more maintenence..... we are talking about some things that just seems wrong....... you ever see a YFZ450 run at night??? i"ve seen a few and guess what... the first 3 or 4 inches of the pipe where it connects to the head glows bright red.....
they have to lean these thigns out so badly to make them run right that they are actualyl burnign themselves up.... a YFZ runs very very hot...... and thats with a alum radiator and a oil cooler....... you can mess with the jetting to solve the problem but your gonna take a small power hit...... also you ever heard a YFZ450 idle?????? not if they aren't hot.....
now heres soemthign i find funny....... of all the 4 pokes i've ever ridden i liek the YFZ450 the best.. because it actually rides a bit like a 2 stroke.... the power is not all right offf idle they are actualy a mid range type engine.. then you have to feather the clutch a bit also.... my budyy sold his 400ex and got a YFZ and the first thing he said was... i liek this quad but....... it rides and runs funny........ the power is way different thatn my cammed and piped 400ex.......... different in a very good way.........  |