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Heed 505

2010 Yamaha YZ450F Yoshimura Project Bike

Monday, October 25, 2010

Yet again, the tuning wizards at Yoshimura and Noleen J6 suspension have proven that they know how to build fast, versatile, and ultimately easy-to-ride dirt bike with this 2010 Yamaha YZ450F.
Greetings and salutations all, I just got back from a fun day of dirt bike racing at Glen Helen Raceway. The occasion was Round 4 of this fall’s Vet X motocross racing series. I decided to partake in the racing festivities to get some extra footpeg time in preparation for the big MTA World Vet Championships the weekend of November 6 that I’m competing in with our Yoshimura-prepped 2010 Yamaha YZ450F.
 
First off, big thanks to the folks at Glen Helen who yet again provided us with a fun, fast and challenging racetrack. They changed up a few areas of the track and included one of the giant hills as used during the AMA nationals making it that much more exciting to race around. They also included a few tabletop jumps and some other obstacles which made it even more entertaining.

Having racked up a fair amount of hours riding at relatively smooth (and slower) tracks like Milestone and Perris, I was curious to see how the bike would perform at a faster and rougher track. And yet again, the tuning wizards at Yoshimura and Noleen J6 suspension have proven to me that they know how to build fast, versatile, and ultimately easy-to-ride dirt bikes.

Based on our experiences at Milestone and Perris I initially assumed that the suspension might be a little soft… and it was but by adding some damping at both ends it continued to offer a high level of balance and stability even on a really rough track. However I did end up running out of adjustment range with the fork so I’m going to contact Noleen this week and perhaps try raising the fork oil height before I return to Glen Helen.

Powertrain wise I am in absolute awe of how dang fast this modified YZ450F is. The engine features Yosh’s Stage 1 tuning treatment in which they port and polish the cylinder head. They also fitted it with a higher compression CP Piston (from 12.5:1 to 13.5:1) and a Yoshimura  RS-4 Pro Exhaust System. To make sure the engine runs properly and the powerband is easy to manipulate a PIM 2 and DATA box were also installed. Together these two components automatically adjust the air/fuel mixture as you ride, how cool is that?

You could assume that a hopped-up 450 engine would be way too powerful and hard to control but in actuality this Yosh engine actually makes the motorcycle almost easier to ride than a bone stock 450 regardless if you’re a rookie or a pro—it’s crazy. The bottom end power is tamer so the tire hooks up better out of the corner. Keep the throttle pinned and the engine spools up much faster and within an instant you’ve reached its strong yet hit-free mid-range followed shortly after by rev-happy top-end power. The engine works so good that I got the holeshot in both my motos enroute to 9-1 moto finishes. Stay tuned for the full bike test next week followed another race test from Glen Helen in November.
Post Tags: 2010 Yamaha YZ450F Yoshimura Project Bike
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