Vintage Dirt Bike Q & A

Anything and everything about Vintage Dirt Bikes! After you Register, email nathan@alp-sys.com and let me know so I can activate you.
It is currently Thu Mar 28, 2024 5:54 am

All times are UTC - 7 hours [ DST ]




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Help for 1979 cr125
PostPosted: Sun Nov 13, 2016 9:28 am 
Offline

Joined: Thu Nov 10, 2016 1:57 pm
Posts: 3
Hello, I plan on vintage racing a 1979 Honda cr125 next year. I am looking for help concerning placing a 21' wheel on the front. Who does frame mods for this, and what type of upgraded rear shocks or mods for them. I read that someone has a cd concerning this bike but I can not get hold of them. Also clubs, suggestions on where to get parts... I am new to this type of media, so any help would be greatly appreciated. Thank you gourleyville@yahoo.com


Top
 Profile  
 
 Post subject: Re: Help for 1979 cr125
PostPosted: Sun Nov 13, 2016 6:39 pm 
Offline

Joined: Sun Nov 30, 2008 12:10 pm
Posts: 1010
Location: Connecticut, USA
Here's a Google link to a bunch of '79 CR125 info here at VDB, in case you have little luck with the search function:

https://www.google.com/search?q=79+cr12 ... lp-sys.com

Once you've got a 21" wheel installed, I'd strongly suggest riding the bike several times w/modern tires before cutting up the frame, especially if using 30+ year old info - you may really like the way it handles as-is. Back in '79 a 27° or 28° fork angle (which is close to what you'll have with just the rim-size change) was considered ultra-steep, but nowadays 26° or even less is the norm and 28° will likely seem raked out and stable-feeling. If you don't like it, mod the frame.

Ray

_________________
'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric


Top
 Profile  
 
 Post subject: Re: Help for 1979 cr125
PostPosted: Wed Nov 23, 2016 3:44 pm 
Offline

Joined: Thu Nov 10, 2016 1:57 pm
Posts: 3
Thank you for the tip, Ray. I will try the stock frame first. Right now I am trying to get parts to restore the bike, if anyone has a tip it would be appreciated. Thank you John


Top
 Profile  
 
 Post subject: Re: Help for 1979 cr125
PostPosted: Wed Nov 23, 2016 3:44 pm 
Offline

Joined: Thu Nov 10, 2016 1:57 pm
Posts: 3
Thank you for the tip, Ray. I will try the stock frame first. Right now I am trying to get parts to restore the bike, if anyone has a tip it would be appreciated. Thank you John


Top
 Profile  
 
 Post subject: Re: Help for 1979 cr125
PostPosted: Thu Nov 24, 2016 10:45 am 
Offline
User avatar

Joined: Mon Jun 01, 2015 6:29 am
Posts: 34
Location: Burlington NC
We changed from 23" to 21" and the bike actually handled better with the 21" and changed nothing else. Kind of felt like a chopper with the 23". Hold on to the 23" wheel and tire cause you may want to restore it back to stock once your done racing it or if you are looking to get rid of it they bring good money. What region are you in? I'm the coordinator for AHRMA South East region and if there is anything I can help you with just let me know. My contact info is on the website. www.ahrmase.org

_________________
73 Honda CR250m
74 Honda CR250m
75 Honda CR250m1
76 Honda CR250m1
80 Honda CR250R
79 Yamaha YZ250F
79 Yamaha YZ400F
74 Yamaha GTMX80
75 Honda MT250 x3
66 Honda CA77 305 Dream x2
67 Honda CB77 305 Super Hawk
2009 Yamaha YZ250 2-smoker
2008 Honda CRF150RB


Top
 Profile  
 
 Post subject: Re: Help for 1979 cr125
PostPosted: Fri Dec 02, 2016 1:33 pm 
Offline

Joined: Fri Mar 09, 2007 12:36 pm
Posts: 100
Location: England
We did the frame mod back in the day and it worked fine. I'm now again racing a 79 CR125 and using a 21" front wheel without the frame mod, handles a treat for me we needn't of bothered back in the tbh.

https://i.imgsafe.org/1cb3172e71.jpg


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 7 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 45 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group