Maintenance & Technical > KX500 Original
Foam cuts down vibration?
USMC 500:
--- Quote from: Good on December 31, 2008, 07:29:20 AM ---Interesting topic.
I too remember the CR250s being too rigid out of the box and I think it was McGrath who didn't like them and wouldn't ride them at first.
But, would this expanding foam add rigidity, or just dampen vibration? Not talking the marine stuff, just simple expanding foam found at wally-world. I wouldn't think it would make the steel frames as rigid as their aluminum counterparts, but the vibration issue might be worth looking into. Great topic.
In the car stereo world, sound deadening is achieved by adding mass to door panels, etc. It would be cool to inject some of that stuff into the frames. The problem with that is mass generally = weight...
--- End quote ---
Cool I started a bitchen topic!....hooray for me :-D LOLLL! I also have a 1997 (first year for aluminum frame) CR250 and yes, its rigidity is equal to a 2 year old loaf of french bread......very little (none) flex. :wink:
Good:
Maybe AJ will chime in here, but I wonder what the best years were for the 500 swaps in those frames. It is possible that that rigidity would be tamed or vice-versa with the 5s power. Or might make it a horrible ride.
I always thought, though, that I'd like a stiffer ride. Kinda like riding a meat cleaver vs one of those old floppy wood saws that hillbillies make music with. :lol: You don't see surgeons working with those things, nowadays anyway.
You know, once the ergos fit, it's like a scalpel, or something... But, I'm faster on my '00 KX5 than I was on my '99 CR250 in all terrain. My 5 just out-handles it, and maybe there was something wrong with my forks, but it's true...
That makes me wonder how that '09KX5AF handles... I wanna ride one, BAD!!!
Dutch-K5 Fan:
--- Quote from: GDubb on December 31, 2008, 07:45:58 AM ---
--- Quote from: Good on December 31, 2008, 07:29:20 AM ---I too remember the CR250s being too rigid out of the box and I think it was McGrath who didn't like them and wouldn't ride them at first.
--- End quote ---
I remember that too... he was having the new engines swapped into a modified '96 frame.
-G
--- End quote ---
Mc Grath rode the 93 frame when he was at honda. Thats wy he went to Yamaha because he had
to ride the alu frame.
A bike most flex a bid, even road racers use flex in there frames. It's a bit of the bikes suspension when it's
on his side an rides over bumps.
And the foam idea is for reducing the vibes.
Dutch
dsrtrider:
I read old articles where team green would run rubber bar snakes, weighted bar ends, carefully tighten bolts, and balance crank for their vibration reduction strategy
USMC 500:
--- Quote from: Dutch-K5 Fan on January 01, 2009, 12:46:16 AM ---
--- Quote from: GDubb on December 31, 2008, 07:45:58 AM ---
--- Quote from: Good on December 31, 2008, 07:29:20 AM ---I too remember the CR250s being too rigid out of the box and I think it was McGrath who didn't like them and wouldn't ride them at first.
--- End quote ---
I remember that too... he was having the new engines swapped into a modified '96 frame.
-G
--- End quote ---
Mc Grath rode the 93 frame when he was at honda. Thats wy he went to Yamaha because he had
to ride the alu frame.
A bike most flex a bid, even road racers use flex in there frames. It's a bit of the bikes suspension when it's
on his side an rides over bumps.
And the foam idea is for reducing the vibes.
Dutch
--- End quote ---
History lesson time :-D.............
Actually McGrath rode his 1993 CR250 in 93, 94, 95, and in 96 while Jeff Stanton, Steve Lamson, and Doug Henry (get well soon) rode the bike of the year. Jeremy said that he liked the egronomics of his 1993 frame. Then came the 1997 CR250 (same bike I still have :wink:) which by coincidence (yeah right) was heavily based on the 1993 frame geometry. The first year of the aluminum frame was super rigid and McGrath tried all types of suspension settings while testing the bike to get it to his standards......didn't happen. So for the next year Jeremy jumped ship to Suzuki for personal reasons (he stated that the bike had nothing to do with it :roll:) and lost the SX title that year to our very own Jeff "Fro Daddy" Emig on the mighty KX250. I guess the Suzuki was not what it was today because for 98 Jeremy jumped ship again to Yamaha. Personaly I would have loved to see the kind of madness that a 500cc Supercross would have caused. :-D
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