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I talked to Yami rep about the hole and he told me the same,it was for cooling the pipe. He also said the finish product would have a screen covering the openning.

Like was said it has a high 12.4 compression ratio with a Knock Control System,always on and adjusting to the type and quality of the gas you put in it. I also read you lose about 4hp on 87-octane and if the gas is of poor quality,to low of octane like old gas a warning light comes on...

Yami rep told me 12 to 18mpg. It will run on 87octane but you lose 4hp.

I also asked the Rep if they would bump the 500 up to a 600 and get close to 100hp,as we know it could be done.He responded that Yami doesn't want to over burden their Dealers with to many different models like the other manufacturers have. I think it will be a triple,but something lower...

I talked to a Yamaha Rep that told me they tried the 450 doubled up and it didn't work out. I think it's going to be a triple based on the YZ250F motor.Heared it will be ready in 09. Also heared yami took the guy's off the 09 project to build more preproduction phazers and I don't...

Call around,some have them. ;)!

Talked to a yamaha rep at one of the snowmobile shows,wouldn't tell me whats comming next but he did say what isn't.No doubled up 450s,no displacement increase in current 500twin. I got the impression a triple is comming based on the 250 motor in 09. The current 500 engine has been...

Snowtech said bottom end and midrange are like a 500-600cc 2 stroke. They also said, about the closest thing to the Phazer right now is a MX Z 550X. It was said in another post,if they increase the displacement to a 600 on this engine they should get about 96hp out of it. I heard they...