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Old 04-23-2009, 03:00 PM   #76
bgoodsoil
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Stagewife, that cracks me up
Quote:
AwRihgt! We'll change the corrugated cardboard battery holder!......
That's the part that kills me....it's totally battery operated...
he's gotta plug it in each nite....
...how green is that?
yeah but that's just temporary right?

have you figured out a magneto solution for it yet, Stage?
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Old 04-23-2009, 03:38 PM   #77
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I think we all deserve a nice wheelie pic
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Old 04-23-2009, 05:06 PM   #78
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enjoying the thread thoroughly Jason.
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Old 04-23-2009, 05:16 PM   #79
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I kicked a wheelie after blowing my rear shock--BAD IDEA. The spring compressed when the front end raised then decompressed while I was mid air and started wobbling. The front came down, I ran off in the neighbors' yard, and people laughed at me.

Doing the same on a bike with some super wonkie suspension would be equally stupid. wear a helmet?
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Old 04-23-2009, 10:54 PM   #80
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Originally Posted by BikePilot
Cool project!

FYI those aren't CR250 forks. If they are indeed 41mm, they are XR250R forks (1996 or newer IIRC). If they are 43mm they are probably XR400R forks (98-99 DR350's also had 43mm forks with extruded lowers, but it looks like a honda brake caliper setup so probably not the 'zukes). You may want to add something like the SRC fork brace to help limit twisting and improve steering response.

CR's never had conventional forks with extruded lowers and haven't had conventional forks of any kind since '88 and (and those were 43mm with cast lowers).

In any event, the only damper rod, extruded-lower conventional forks made (that I can think of) are the ones that come on DR650SE's (43mm) and the early DRZ400S models (49mm). So, its almost certain that they are cartridge forks.

It is also likely that they came from a bike much lighter and likely were too softly spring for that bike - stiffer springs would be really useful for your application. As a rough guess I'd think something in the .47kg-.52kg range would be about right depending on how hard you plan to ride it. You may have to buy the stiffest thing available, then lop off a couple coils and make a spacer to get the needed rate.
Thanks! and they have been sortof confirmed as 1996 XR250 front forks. You seem to be very knowledgeable about these... thanks for the info on spring rates, what else can you tell me? I plan to ride it about as hard as I can, which may not be as hard as it can be ridden, but we're going to try.

speaking of sag, (no you didnt mention, but my mind jumped ahead three places) I'm dying to weigh the bike.
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Old 04-23-2009, 10:55 PM   #81
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Originally Posted by Bloodweiser
I think we all deserve a nice wheelie pic
This weekend I'll need a cameraperson
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Old 04-23-2009, 10:56 PM   #82
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thank you, Caddyeightytwo and Datchew too.
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Old 04-23-2009, 11:00 PM   #83
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Quote:
Originally Posted by bgoodsoil
Stagewife, that cracks me up


yeah but that's just temporary right?

have you figured out a magneto solution for it yet, Stage?
hah- no magneto yet... i just barely found myself clever enough to get a battery on it in the first place

now i need to replace the brake line At least I didnt fuck it up till I was on my way out of the woods, anyway.

Danedg tells me there is a car place locally I can get a brake line crimped up while-u-wait. Dan?
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Old 04-24-2009, 04:44 AM   #84
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Originally Posted by Stagehand
...now i need to replace the brake line...
You can get a braided Galfer line for it from RockyMountain for under $50, linky.

I had some time with a '95 XR250 a month or so ago and determined that the stock 15 year old brake line needed an upgrade. I could not get a good brake feel. (but I am really picky about front brake feel).


As for the rear tire: I mounted a Mitas Cross 110/18, this tire does not fit the swingarm. Good to know that your tire mounted up nicely.
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Old 04-24-2009, 05:05 AM   #85
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Here's the racetech page for the XR250R from which your forks likely came
http://old.racetech.com/evalving/eng...ngname=english


Looks like the stock springs are about .39kg and the stiffest they offer is .46gs. The latter would be a huge improvement over stock, but still might be a bit on the soft side - it would be a great starting point though. You could check with other mfg's as someone may offer a stiffer spring for it. You could cut the spring down a little and use a spacer to make up the rest of the height to gain additional spring rate, just take care that the forks don't bottom out on the spring itself. There's a rough way of calculating how much cutting will yield what rate increase, but I don't remember how it works...

I would shoot for sag (with you on the bike, ready to ride) just under 25% of total travel - so about 3.75-4" for your forks. You can adjust spring pre-load with small spacers ontop of the spring (cut PVC pipe).

An oversize front rotor would be useful too as the brake is probably not up to stopping a bike of that weight, especially if you plan to do much street riding.

have fun!
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Old 04-24-2009, 07:11 AM   #86
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Quote:
Originally Posted by datchew
enjoying the thread thoroughly Jason.
Yupper. That's gonna be a damn fun ride.
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Old 04-24-2009, 08:32 AM   #87
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Thanks a million, guys


- found this:

41mm leading-axle Kayaba cartridge fork with 20-position compression damping adjustability; 10.6 inches travel


I need to find this compression damping who-ha. Its the screw business on the fork top?

Its embarrassing, how new I am at this...
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Old 04-24-2009, 08:43 AM   #88
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almost pulled the trigger on this:

http://cgi.ebay.com/ebaymotors/Yamaha-YZF600R-Delkevic-Stainless-STUBBY-Muffler-95-07_W0QQitemZ280326657519QQcmdZViewItemQQptZMotorcy cles_Parts_Accessories?hash=item280326657519&_trksid=p4506.c0.m245&_trkparms=65%3A1|39%3A1|240%3A1318
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Old 04-24-2009, 08:54 AM   #89
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Quote:
Originally Posted by Stagehand
Thanks a million, guys


- found this:

41mm leading-axle Kayaba cartridge fork with 20-position compression damping adjustability; 10.6 inches travel


I need to find this compression damping who-ha. Its the screw business on the fork top?

Its embarrassing, how new I am at this...
The compression adjuster is probably somewhere around the bottom of the fork. The screw on the top of the fork should be the rebound adjustment.

Unless dirtbike cartridge forks are that much different from sportbike cartridge forks...
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Old 04-24-2009, 09:08 AM   #90
bgoodsoil
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There's no doubt that you can find a cheap muffler at a motorcycle junkyard, in a pretty good shape, for $30-$40 or less. The advantage to that is also that you can take measurements of it or even throw your bike in the back of the truck and take it with you to see how different pipes fit.

I know you were considering 2 into 2 pipes but 2 into 1 will be lighter by 1 muffler.
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