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Can't remember where I saw it but it was an Yamaha engineer talking about the rearward slanted engine being an evolutionary requirement to get straighter intake tract than was possible with the airbox located under the seat. in order to straighten the intake any more using a conventional design you would have to raise the airbox and boot, making the...

Those questioning his bike being legal (big bore) should keep in mind that he only goes about 135 lbs. and is strapped to a 45-50 hp. factory prepped rocket that is also likely right at the AMA min wt. limit. That's how you would expect it to go up big hills..

$2780.00 in purse money plus 1500.00 for the holeshot.. so he still netted +220.00.... def not a big enough fine...

forged pistons expand more during the heating cycle thus have to have more clearance with the cylinder bore. Cast pistons can be run with tighter tolerance. This could lead to more wear from a forged piston rocking more in the bore till it gets up to operating temp. The skirts on the wiseco pistons I mentioned in my above post...

This question will get lots of opinions. I have on my work bench 5 used pistons that all have a full race season of enduros and hare scrambles (60 + race hours) 2 of them are wiseco and 3 are vertex. the 3 vertex look like I could throw new rings on them and put them right back in service...

What they aren't saying , and what really matters is that they took what was the lightest, simplest , most durable 250 F and turned into another bloated complex and disposable pig. No thanks I will keep my 2 stroke....