collapse

www.dimecitycycles.com


www.restocycle.com

www.MajureDesigns.com

www.CITYLIMITMOTO.com

www.jadusmotorcycleparts.com

www.racingsmith.com

www.bisonmotorsports.com

www.speedmotoco.com

www.cognitomoto.com

www.townmoto.com

www.sparckmoto.com

www.Moto-Madness.com

www.pistonsociety.com

GET DTT UPDATES ON FACEBOOK AND TWITTER

Author Topic: Question about stem bearings and front end swap  (Read 724 times)

Offline irk miller

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 5809
  • You've been mostly-dead all day.
Re: Question about stem bearings and front end swap
« Reply #15 on: Mar 11, 2017, 13:18:58 »
I didn't realize you were building a dirt bike you were going to go jumping with. I've owned many bikes with press in cups, stock on most Harleys. Doing nothing and causing damage to the tag is definitely easier than trying to paint or powder coat or weld after easily drilling out the rivets. there's nothing special about the drive screws that hold it down.
Let me ask you "How many dirtbikes have you jumped with pressed in cups or non-welded cups?"
Do people actually ride dirtbikes without ever jumping with them, or riding over rocks, or other debris like logs?  And there's this shit called tape that takes about 33 seconds to cover a plate with while you spray.  You're such an idiot with your bullshit criticism all the time- like that post you made to me where you tried to correct me by saying there was no such thing as a Honda MR250 motorcycle.  The bike we're talking about in those pics is a frankenstein bike purely built to run ragged on backcountry Georgia and South Carolina trails.  I did not powdercoat it.  I will not ever powdercoat it.  It's an untitled frame that I got for $40 to cut up and put an RM suspension on.  Know the whole story first, dumbass.   

Also:  If you look really close in the pic, you'll notice remnants of yellow paint where I machined down the stock RM neck to fit inside the XL tube.  Those are welds.  So, basicallly what I did there was essentially copy the stock RM design. 


Offline Jewbacca

  • Posts: 1138
  • Therapy is expensive. Riding is cheap. You decide.
Re: Question about stem bearings and front end swap
« Reply #16 on: Mar 11, 2017, 13:27:08 »
Without adding to the love on this thread,,, Why not have someone cut a new stem for you to an available bearing size? Is it just a budget or time issue? I've turned my own stem for my TX project bike and have 2 others who have asked me about turning new stems for them as well. It would solve the issue with having to cut/weld new cups in the neck, and make future repairs/bearing replacing much simpler.
1979 Honda CB750K- Soon to be CB750K-SC Night-Ninja (SOLD)
http://www.dotheton.com/forum/index.php?topic=18771.0
1974 TX500A "Yamahonda" http://www.dotheton.com/forum/index.php?topic=66736.0"
1983 Honda CB650SC
http://www.dotheton.com/forum/index.php?topic=70532.new#new
Gives me a major cramp in my wedding tackle..." Fellow PNW Rocker Dave Simmons


Offline esmoojee

  • Posts: 99
Re: Question about stem bearings and front end swap
« Reply #18 on: Mar 11, 2017, 17:42:06 »
Couldn't you just buy an older cbr triple off of ebay and use it or swap out the stem? 

Offline erock85

  • Posts: 73
Re: Question about stem bearings and front end swap
« Reply #19 on: Mar 12, 2017, 15:14:10 »
Couldn't you just buy an older cbr triple off of ebay and use it or swap out the stem?
That's what I'm thinking of doing, just replacing the triple tree with an '07. But now I'm not sure the fork tubes are the same diameter. I know this one on the '08 is 54mm at the bottom triple and 50mm at the top. If I just swap the stem I will need some adaptor rings pressed in the triple clamps because the top but is 32mm and the older cbr is 30mm or less. I don't have one to check. I would say a new stem with rings is the best bet. I was just wondering if the cup thing was viable or not. And as irk has shown it definitely is. And I'm not sure what that other dude's problem is but it appears this is "normal" for him. I will update this post with what I do. Should be able to get it done this weekend.
1974 Honda CB360
1979 Honda CX500

Offline esmoojee

  • Posts: 99
Re: Question about stem bearings and front end swap
« Reply #20 on: Mar 13, 2017, 20:59:47 »
I have a 2002 cbr954 front end on my bike.  I can measure the forks for you in a day or two and tell you if the measurements are the same.

Offline esmoojee

  • Posts: 99
Re: Question about stem bearings and front end swap
« Reply #21 on: Mar 15, 2017, 15:02:36 »
Measured my forks, 50mm at the top and 54mm at the lower triple clamp

Offline erock85

  • Posts: 73
Re: Question about stem bearings and front end swap
« Reply #22 on: Mar 16, 2017, 11:34:39 »
Measured my forks, 50mm at the top and 54mm at the lower triple clamp
Awesome! thank you for the information! That will work for me, and the stem is the smaller O.D. I'll just have to source a set.
Thanks again

Do you know if the 929 is the same? I know the top fork diameter on the 929 is 50mm, but I have not found the bottom measurement info
« Last Edit: Mar 16, 2017, 12:08:26 by erock85 »
1974 Honda CB360
1979 Honda CX500

Offline erock85

  • Posts: 73
Re: Question about stem bearings and front end swap
« Reply #23 on: Mar 16, 2017, 12:24:54 »
Found it http://www.gillestooling.com.au/Honda-Fork-Yolks.php

Honda CBR 1000 RR           2004 - 2005   FO-SC57-500.540   fork-diameter up=50,0 mm, low=54,0 mm

Honda CBR 1000 RR           2006 - 2007   FO-SC57-500.540   fork-diameter up=50,0 mm, low=54,0 mm

Honda CBR 900 RR / 929   2000 - 2002   FO-SC50-500.540   fork-diameter up=50,0 mm, low=54,0 mm

Honda CBR 900 RR / 954   2002 - 2004   FO-SC50-500.540   fork-diameter up=50,0 mm, low=54,0 mm

Honda CRF 250 R               2000 -           FO-CRF-530.584   fork-diameter up=53,0 mm, low=58,4 mm

Honda CRF 450 R               2002 -           FO-CRF-530.584   fork-diameter up=53,0 mm, low=58,4 mm

Honda VTR 1000 SP1        2000 - 2002   FO-SC45-500.540   fork-diameter up=50,0 mm, low=54,0 mm

Honda VTR 1000 SP2 / RC51   2002 -           FO-SC450-500.540   fork-diameter up=50,0 mm, low=54,0 mm
1974 Honda CB360
1979 Honda CX500

Offline esmoojee

  • Posts: 99
Re: Question about stem bearings and front end swap
« Reply #24 on: Mar 17, 2017, 13:00:13 »
Iím pretty sure the 929 is the same as the 954.  The only difference is that the 954 has improved adjustability.

Offline erock85

  • Posts: 73
Re: Question about stem bearings and front end swap
« Reply #25 on: Mar 20, 2017, 09:52:50 »
Iím pretty sure the 929 is the same as the 954.  The only difference is that the 954 has improved adjustability.
Is there any chance you could get me the rotor to rotor measurement on the outside? This reference pic is the RC51, but this is the measurement I am after. Thanks for your help.
1974 Honda CB360
1979 Honda CX500

Offline esmoojee

  • Posts: 99
Re: Question about stem bearings and front end swap
« Reply #26 on: Mar 20, 2017, 23:15:09 »
Yea, Iíll try to get that for you tomorrow.  The bikes are at the shop.

Offline erock85

  • Posts: 73
Re: Question about stem bearings and front end swap
« Reply #27 on: Mar 21, 2017, 14:04:05 »
I think everything changed in '08 for the 1KRR
Here's what I did to get somewhat of a measurement, I just need confirmation from someone with an '08+:
I am thinking my rotors are 136.5mm outside to outside on the '09 CBR1KRR.
I get to that number by measuring the space between the backs of the calipers when they are all bolted up, 48mm. Then the opening for the rotor to rotate through the caliper, 9.3mm. And finally the distance from the back of the caliper to the inside of the slot is 37.1mm. Now here's the math part.....(48/2) + (9.3/2) + 37.1 = 65.75mm; which is center of front end to center of caliper rotor slot. Now 65.75 + 2.5(half the rotor thickness) = 68.25mm; center of front end to outside of caliper. 68.25 * 2 = 136.5mm; outside rotor to outside rotor. Confirmation, lol?
1974 Honda CB360
1979 Honda CX500

Offline esmoojee

  • Posts: 99
Re: Question about stem bearings and front end swap
« Reply #28 on: Mar 21, 2017, 20:34:14 »
The 954 is 142mm... hope this helps.


Offline erock85

  • Posts: 73
Re: Question about stem bearings and front end swap
« Reply #29 on: Mar 23, 2017, 12:11:35 »
The 954 is 142mm... hope this helps.
Thanks, that does help a lot in case I switch the triple out. Once I get the rotors in the mail I'll be all good to finalize my design, but here's the rotor adapter to the Comstar wheel
1974 Honda CB360
1979 Honda CX500