Re: Yamaha Banshee + Kawasaki Ninja 250 = Rz350 clone?

> I'm considering starting another project this winter, but I'd like to
> run the concept past the list members for opinions, comments, and
> advice.
>
> The goal is to build a twin cylinder two stroke road bike using the
> yamaha Banshee ATV engine. The 350cc twin was derived from the RZ350,
> but has no powervalves (they are available on the aftermarket, but are
> not cheap). the bike of choice to receive the engine is currently an
> early to mid 90's Kawasaki Ninja EX250. It is a small and lightweight
> bike, is available at a reasonable price (they only cost ~$3000 new),
> and handles well.
>
> The engine will likely recieve some mild massaging to open up the
> factory restrictions, and will make between 50 and 70hp. custom pipes
> are mandatory.
>
> In talking to some other enthusiasts, one suggested the EX250 is a bad
> choice and would suffer from headshake problems. My '87 ex500 does
> this under deceleration, but only if the bars are let go of for more
> than 10 seconds or so. I suspect this is partially due to the 16"
> front wheel, and partially due to Ohios poorly maintained roads. I
> would use the Ninja 500 I already have, but I've never been
> comfortable with the way it handles and brakes- it only has drum
> brakes on the rear.
>
> so the question is- Would reducing the mass of the engine cause
> headshake problems, and if you think so, can you explain yourself?
>
> The goal here is simple: I want a modern looking bike with the sound
> and rush of a 2 stroke, but I dont want to spend more than a few
> thousand dollars on the project total. The bike will be ridden around
> town and on local country roads, for no more than a few hours at a
> time, and always fueled from home. It will not be raced, or even
> ridden at illegally high speeds for more than a few short stretches
> (1/4 mile dragstrip).
>
> Also, I can fabricate.
>
> thanks for your thoughts,
> -A.J.
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