[quote name='ONLY4STROKES']The CRF450R makes less horsepower
than the YZ450F.[/QUOTE]
This is the most common misconception I hear about the two bikes. In 2003 the YZ-F made 3 more HP than the CRF 49 vs 46.
For 2005 the CRF makes 5 more HP than the YZ-F 45 vs 50. They have basically reversed #'s. Yamaha
has yet to make their power as smooth and managable as the Honda
's despite giving up 5 ponies.
[quote name='ONLY4STROKES']The CRF450R has valve problems, unlike the YZ450F.[/QUOTE]
The CRF doesn't have valve problems. It's valve train certainly isn't prone to failure. It's valve train does have a shorter service life due to the inherent design (2 intake valves vs. 3 intake valves). The YZ-F's 3 intake valves are able to flow the same amount, but at a lower lift than the CRF's 2 intake valves. This places less stress on valve components.
Yamaha is the only manufacturer to offer a 5 valve head. They have been for a long time (on their sportbikes - late 80;s I believe). Remember the old Genisis motors? This is a credit to Yamaha
's inginuity. It is a very successful design.
The CRF isn't lacking. It's on par with everyone else, except Yamaha which has an exceptional design.
[quote name='ONLY4STROKES']The CRF450R has been proven to handle way sloppier than the YZ450F.[/QUOTE]
Are you serious? The 2005 CRF is one of the best handling MX bikes ever. It's in another league. The 2005 RMZ is the only 450 that can present a case due to it's tight turning ability.
Better luck in 2006.[/QUOTE]
[quote name='ONLY4STROKES']The CRF450R holds less oil and burns it alot quicker than the YZ450F.
...make the right decision.
The only CRF's that are burning oil are poorly maintained ones that need a new top-end/valve job. There are a lot of idiots that have no business trying to maintain a modern 4-stroke.
If you add the engine oil capacity with the tranny fluid capacity they come out roughly the same as the YZ-F's total capacity. The fact that Honda separates the two oils is a credit to their ingenuity. My oil always comes out looking new. I like the system and wouldn't want to go back. I wish my 2005 GSXR-1000 had separate engine and tranny fluids.
2006 should be interesting - I can't wait.