Re: modify frame cbr 954
well a certain amount of flex is a good thing. Once upon a time, a frame was just some tubing that held the engine in place and connected the steering head to the swingarm. As tires improved and engine outputs increased, the forces involved in braking and accelerating started to overwhelm the tubular steel chassis, and frame builders started to make their frames stiffer. In the 1990s, chassis builders started to encounter the opposite problem: as their frames got stiffer and stiffer, the bike started chattering and vibrating, making handling terrible, especially when leaned over, when the suspension of a bike ceases to work, being in the wrong plane. And so the concept of flex was introduced, adding sufficient flexibility to allow the bike to absorb some of the bumps while leaned over, but still stiff enough to keep the chassis stable in a straight line and under braking. Since the late 1990s, and especially since the four-stroke era began, a huge amount of work has gone into engineering in exactly enough flexibility in specific areas, while retaining the stiffness in the planes where it is needed.
im not saying the mod wouldnt help or make it better but the engineers spend quite a bit of money and time developing those aspects of the bike. i think on a full on race bike like the erion they likely came into a situation where all the race spec parts bolted onto the standard 954 frame put it in a situation where the chassis was overcame by the forces produced by all the extra horse power and braking forces that you wouldnt find on a street version of the 954.
you would hafta spend a whole lot of money to get a stock 954 into the realm of needing that kinda modification i believe. its a fine balance and the 954 chassis is a good match in my opinion for the bikes power delivery and braking ability just how it sits.
like i said im not saying it wouldnt improve it my friend or that your friend is incorrect because i havent personally done the mod to my 954 so i cant speak from experience. however, it doesnt look like a cheap mod even if you can find something similar on the market to purchase. i havent ever seenn this mod as a bolt on part you can just pick-up at your online parts supplier. it looks pretty custom.
i think if you want to improve your bike in the very best way for the money spent, get your front forks upgraded. you dont hafta buy ohliens but even a nice valve upgrade and springs for your weight are easily the best way to make your bike better. followed by a nice rear shock. then i would move into the brakes. i just think that mod on the erion is due to the bikes very high hp output and its highly modified suspension and brakes. those things put a lot of extra stresses on the frame and then i can see where it might be a justified need. on your street 954, im not so sure your money wouldnt be much better spent on suspension. a fine tuned suspension is hands down the best way to improve the already awesome cbr 954.
"love is the feeling you get when you like something as much as your motorcycle."-Hunter S. Thompson