Im not sure why they stoped production of power valve machines. They put a powervalve on the RZ350 which is a street bike, which is essentially the same motor as the banshee. It would of been in good intrest to slap one of those on the shee as well. Two stroke research has slowly died off because 4 strokes are now taking over the market. This could also be why you don't see alot of them around anymore.
The reason they probably didn't put it on the blaster is because like you said, its not really a race machine, but more of a beginner quad.

There is no need for a power valve on a 4 stroke, as they use valves and not ports. The cam on a four stroke controls when the valve is opened, but with a 2 stroke the piston IS the valve. As it moves up and down the cylinder it controls when the ports open.

 

yeah i wish they woulda put one of those on my blaster. oh well. i forgot about 4 strokes useing valves. thats right. i would like to see a banshee with a power valve. that would be awesome.

 

yeah a banshee could really use one too !but once they get up in the rpms THEY RIP ![img]i/expressions/face-icon-small-happy.gif[/img]

 

Correct me anybody if I'm wrong but as I recall the zilla, lt250 and the tecate4s all had powervalve but i belive the honda 250r did not. Yes the banshee engine came from the RZ350 I belive you can actually mount RZ350 heads to a banshee lower end and have a powervalved banshee

 

There are several companies which offer powervalved big bore kits for banshee's, so they are not uncommon. The LT powervalve set ups didn't do much for power in my opinion, as there are much better designs. The Tecate was ok, but their dirt bike valves were better. The RZ set ups are harder to do as they are run by the servo motor. Most aftermarket powervalve cylinders are simply run by the cylinder pressure. Powervalves are not the ultimate solution when you're looking for all out HP. Most drag racers do not use them, they are much better suited for lowend, MX type riding.

As for 2-stroke motor development, you should check out Ski-Doo. They currently have developed a 600 and 1000cc twins which are 2006 EPA compliant. 2-strokes maybe around longer than most think. Its just a shame that the Japenese manufacturers have given up on them.

 

i believe you are correct.

 

yep, but you can get aftermarket pv's like i got on my 250R, blasters have nothing over an R, and besides the 4 stroke engine i think that Yamaha sort of took the frame geometry of a 250 and put a 450 bike engine in it, that extra 50cc's is nothing when you consider how the engine of an R is built and that there is much weight difference at all and the blaster is so much smaller, but yet only like 30 pounds or something lighter. The PV's on the 87-92 Quadracer 250's made a huge difference over the 85-86 LT's, that PV helps out alot on those engines same as it does on the Hondas, it's weird how they work, on the Suzukis it runs off the exhaust sort of like a Turbocharger on a car, but doesn't work anything like a turbo, and even a modded blaster is going to have a hard time beating a piped and airfilter 250R, why i have no clue how Honda made such a small engine go as fast as it does, i love everything about my 86 250R, power is awesome can't keep the wheels on the ground no matter what, speed is unbelievable feels like a jet plane, and the d**n thing rides like a cadillac and handles like a Z06 Corvette. however honda made a machine like this it definitely had an effect on how the 450s were designed i will GARANTEE that, and when the day comes someone comes to me with a 450 that they want to try against my R, i'll gladly see which one is the best, but for me i'll keep my old 2 stroke.

 

yep. before i start a rant here and perhaps get off topic, i am thankful to have both 250R & 450R.
the 250r is the quintessential quad. people think i am nuts for still liking the 250R better! i love the 450 engine, but sorry the 250r just handles better, has lower center of gravity, and isnt as squirrley at high speeds. maybe thats rider preference, but i cant imagine anyone wanting to get squirrley and unstable at high speeds and then declaring that a 'best handling' trait..really??. not in my book. honda could have done a little better.

the 450's have picked up the 250 wars of the late 80's with the twist of four stroke technology. thats good. now if honda would just fix the issues the 450r has, i think it really could be the REAL 250R replacement. in its current form, the 450r is a good bike, but not the great bike its predecessor was.

 

blaster is cheaper in price

 

My blaster gives a 250R a good run for it's money.
even beats a few too[img]i/expressions/face-icon-small-shocked.gif[/img]