Mc 5 rear spring rates

[brian kirby]

Big Mac,

I was sure I read here that the black springs, usually found on 400s, were stiffer than the purple usually found on 250s? I've just about decided that most of my handling issues with the MC5 I'm trying to dial in is from too soft rear springs. I think everything I am doing to the front is offset with too soft rear springs that squat too much and make it push in corners.

Brian

'72 Berkshire

[Mike Lenz]

I should mention that the Progressive springs are rather large at one end and rather small at the other. Im not sure if stock Marz retention clips will work. I think I used something else I had that fit and wound up running the spring upside down with the larger dia end at the top of the shock.

[tomale]

I am convinced that my MC 5 would handle alot better if the rear end was properly sprung. The other thing too is that the fox shocks measure out at 13.25 so even if they were sprung right, it would still cause a problem... I have been thinking about this and I have decided to add a spacer underneath the top out spring. The deed is done, but is still unproven....The other option is too make longer shafts for the springs.... I know alot of work but I love my shocks....

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)74'
250 hare scrambler (project bike)

[brian kirby]

quote:Originally posted by tomale

I am convinced that my MC 5 would handle alot better if the rear end was properly sprung.

I am too. Look at the picture below. I am not racing I just crossed the finish and look how low the rear suspension is squatting, and that is with a 140lb rider.



Brian

'72 Berkshire

[brian kirby]

Also, I just got a set of '78 38mm triples and forks, and I have a set of '79 Honda CR250 shocks with springs like Jon's Husky springs that should work well. I'll also try a set of the Progressive springs. I'm convinced now that I've been working on the front end all this time and the source of my poor turning issues are at the rear.

Brian

'72 Berkshire

[Tahitian_Red]

This is why God invented Fox Air Shox.  I hope you get it worked out Racin' Rev.


Racing the "FaltaNator" in 2009

[tomale]

Hey Red, nice to hear from you, It may take awhile but It will get there...I may have a line on a set of forks so that is good, the only thing left is the rear springs, and that is matter of money... thats why it may take awhile.. No sense riding a bike that is not sprung right. No worries though...

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)74'
250 hare scrambler (project bike)