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Author Topic: Love Child, an unholy union of CB400t and XR250r  (Read 4413 times)

Offline Tune-A-Fish©

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #20 on: Apr 15, 2016, 15:54:27 »
hyper extended chain resulting in output shaft stress fail possible broke chain gatherer at the case hole.?
"I didn't come here and I ain't leavin"  Willie Nelson

"love hard, live fast, die fun" Kacey Musgraves

"Like a Wreckin Ball!" Eric Church

Offline xb33bsa

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #21 on: Apr 15, 2016, 16:00:23 »
hyper extended chain resulting in output shaft stress fail possible broke chain gatherer at the case hole.?
ive seen it, if nothing else it will burn up a chain quick :) makes 'em run kinda hot like

Offline Zweihammer

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #22 on: Apr 20, 2016, 02:18:07 »
I supported the frame from the ceiling and with the suspension unloaded as far as it can extend.



Here's the worst line I can expect extended, the tension side misses by 3/8, the slack side misses the lower frame by a quarter.



Then I took the top of the shock out of the clevis and let the bike down to the point where the shock would be in coil bind.



Looking at the relation between the pivot and the counter sprocket it actually slackened the chain and the slack side still missed both the swingarm and the frame. I should probably put a rubbing block on the frame anyway in case of chain whip.



After agonizing over my situation for ten to fifteen minutes, I decided three non running projects was one too many for my limited time and resources. I reminded myself that I picked up the XR to see if I could use something off it to help me with the poor choice I had made with trying to use a GSXR shock without its accompanying linkage, resulting in a soft, 80's dirt bike feel.

So without further ado, I back halved my CM to marry it up to my soft, 80's dirt bike monoshock suspension.





At least the linkage and swingarm were made to be together. I do think I will want a stiffer spring when I am all said and done.

I will carry on the build back on the original project thread, thanks for the support!

And, yes, I still realize the fork legs are still swapped left to right.

Offline Tune-A-Fish©

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #23 on: Apr 20, 2016, 07:39:25 »
You WIN!  :o

"I didn't come here and I ain't leavin"  Willie Nelson

"love hard, live fast, die fun" Kacey Musgraves

"Like a Wreckin Ball!" Eric Church

Offline Zweihammer

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #24 on: Sep 16, 2018, 15:07:52 »
Well, against the advice of the voices in my head, I have pulled this from it’s resting place and restarted my attempt at a contradiction.

I have decided to use another GSXR front as my rear and add a cush. I am not completely there yet, but this shows where I am going. The cush is my attempt at adapting http://www.cushdrive.com ‘s design to my purpose. To be fair, I should have just bought theirs and adapted it, as I am close to the purchase price with just my materials alone.

The blue part is a printed plastic part for mock up. I am already thinking of changes, as I made the center of my cush and the flanges from stainless, and the sprocket from 7075. Too heavy for me, my next version will be all aluminum, as per the original example.

Here’s where it sits as of this weekend.





« Last Edit: Sep 16, 2018, 22:22:31 by Zweihammer »

Offline Zweihammer

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #25 on: Sep 26, 2018, 23:25:44 »
Chunky style...




Offline irk miller

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #26 on: Sep 27, 2018, 00:23:57 »
That sprocket is huge.  You're going to have a crazy short shifter with a top speed under 80mph.  Going from a 37T to a 52T is huge jump. With the 6 gears, you'll hit 7k rpm in first gear @ 20mph. If you can get to 60mph, you'll be screaming at over 7200rpm in 6th.

Offline Zweihammer

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #27 on: Sep 27, 2018, 09:06:48 »
Yeah, it’ll be impractical, it should be able to pull the wheel pretty easily. I have an 18t coming to lessen the stupidity. I am still considering other options for the cush, this design will never get smaller than 45t.
Cheers, Zweihammer

Offline Zweihammer

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #28 on: Sep 28, 2018, 00:44:04 »
Got the front on tonight.
Looks a lot more moto and a lot less vélo.


Offline Zweihammer

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Re: Love Child, an unholy union of CB400t and XR250r
« Reply #29 on: Sep 29, 2018, 01:48:19 »
There is a right way to get an 18t 520 for my little burro, and a wrong way.
I like to think this is the right wrong way.
I found 16t 520 all day long, 17t if I wanted to wait a couple weeks to get it from Germany, or I could get an 18t 530 that came stock on an automatic 400 in two days.
Guess which one I chose.