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Blood Sweat Tears and Grease => Projects => Cafe Racers => Topic started by: bvonroth on Feb 06, 2017, 08:11:54

Title: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 06, 2017, 08:11:54
Last November I began my search for a suitable vintage Honda CB to restore as my first attempt, something to cut my teeth on before moving on to my dream bike; a 1960s Triumph bobber.

I missed out on a cherry little 1968 number due to the fact that a couple of guys managed to get out to the seller before I could. it was a blessing as the very next day i was scouring a general sales site and found another example around the corner from my parents house - a 1973 CB250 $700 cheaper than the other, at $1,300 I considered it a good deal and bought it. Here are some pics of it as bought.

I will be doing some catch-up with my first posts, a little bit to show.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 06, 2017, 08:18:34
My son and I took our new toy home and proceeded to get to planning out all of the work we were to do to make this our perfect cafe project. Didn't take long to start disassembling the bike. The previous owner had decided to heat the tank with an oxy and belt in the sides to create knee dents, I had thought about repairing the tank and fixing the dents to make them symmetrical, useful and less dodgy, after realising that the tank also had a leak on the left hand balance pipe underneath, a new tank was planned for.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 06, 2017, 08:32:08
While tinkering one night I overtightened the top triple and ended up cracking it :'( appears that someone had attempted to weld it once prior only the penetration of the weld looked somewhat lacking, looked into sourcing a replacement of the same type, ended up being cheaper to order a machined top triple from Dime City Cycles, will look trick too.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 06, 2017, 08:40:34
Started to get to cleaning the bike, was greeted by this level of crud in most areas, decided it was time to give it a proper degrease externally before going any further with disassembly. Ended up lifting the motor out not long after. Used some old BMX foot pegs to get a feel for whether I liked the position of rear sets.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 06, 2017, 09:00:17
At this point i ordered my new tank and a seat to suit, they arrived on christmas eve as an early gift to myself
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 06, 2017, 09:08:32
Bought some 90 degree aluminium section to create a key barrel bracket, ended up having a go at polishing it with my bench grinder / polisher i got for christmas.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 06, 2017, 09:57:37
I thought I would have a go at rejuvenating my gauges. Rather than buying new faces I wanted to brighten up the existing while still keeping some age to them. Decided on pulling them apart, cleaning the face then layering on some enamel clear, used some of my wife's bright red nail polish to liven up the needle tip too. These suit me perfect
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: Bootsey on Feb 06, 2017, 19:47:47
Nice, looks like a good start.
What shape the motor is in? Will there be much work ahead making that tank fit?
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 07, 2017, 03:54:57
Thanks Bootsey, motor is strong, needs some carb tuning to get it running perfect but sounds pretty meaty.
The tank will take some work to fit, my dad and I are building some mounts to use the factory front rubbers. Probably be sorting that out next weekend time permitting.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 07, 2017, 04:01:50
I had a go at polishing the lower sections of my front forks at this point, they turned out okay however i know i can do better with more fastidious wet sanding and polishing.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 07, 2017, 04:06:32
I used some aluminium stock to create some small arms to tie the two gauges together and connect them to the underside of the machined triple clamp. I will stick with these for now, likely redesign in the future.
Thought i would put a few parts on and take some photos in the sun.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 07, 2017, 04:26:58
Welded up a quick stand to get the motor up where i could clean it, following a serious degrease and clean i then sprayed the cases. and began polishing parts
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 07, 2017, 04:43:15
Decided rather than buying new rear shocks that i would have a go at rejuvenating the originals, removed the rust with coke and 00 steel wool, sprayed the springs with Killrust epoxy enamel and polished the struts.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: Green199 on Feb 07, 2017, 08:47:24
Shocks are looking nice and tidy, as is the motor!

Don't see many 250's around, mainly the 350's.

Keep up the good work.
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: kosmoto on Feb 07, 2017, 13:42:47
Looking good! I know how much work all that polishing is.  Following along...
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 15, 2017, 00:08:34
Cheers for the support guys!


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Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Feb 15, 2017, 00:12:28
https://youtu.be/ZsXMpMZyPP0
Here is a quick vid of it running prior to tear down


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Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:14:27
Things have progressed dramatically since I last posted a long.... time ago.

Got the motor covers all fitted up with new gaskets
(https://uploads.tapatalk-cdn.com/20170812/472d126837120ecac7bd528993c61b21.jpg)

Decided to reduce the size of the front guard
(https://uploads.tapatalk-cdn.com/20170812/30fcac532f532374d89db7f30c55719e.jpg)

My dad then helped me with mounting the tank and seat to the frame
(https://uploads.tapatalk-cdn.com/20170812/9e304a18fc864e8ee50e976e25ce798f.jpg)
Title: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:20:45
Decided it was then time to take a shot at mounting the rear light, plate and indicators
(https://uploads.tapatalk-cdn.com/20170812/3151478152aed162a4e362e8a76a8c41.jpg)
(https://uploads.tapatalk-cdn.com/20170812/1f557817b929705d207aa0e408a583da.jpg)
(https://uploads.tapatalk-cdn.com/20170812/ad535f96321fe6345e3587b0007c6b48.jpg)
(https://uploads.tapatalk-cdn.com/20170812/9f1842afa85c7a0c35491df7032f2d51.jpg)
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:32:31
Stripped the frame of all paint at his point.
(https://uploads.tapatalk-cdn.com/20170812/b20964ef8de3e4bb003feaa6b7db9eec.jpg)(https://uploads.tapatalk-cdn.com/20170812/6b109c00fb05a217d82f69264fe069ad.jpg)
Then sprayed it with black epoxy enamel.
(https://uploads.tapatalk-cdn.com/20170812/21d2231799b4051807ac99bf67279a1e.jpg)(https://uploads.tapatalk-cdn.com/20170812/5cf764829065ffc09c80ef9e5f82e96b.jpg)(https://uploads.tapatalk-cdn.com/20170812/f80dfbbf349ab3ab6c8d27db0058c02a.jpg)
Title: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:34:41
Mounted the engine and got very excited.
(https://uploads.tapatalk-cdn.com/20170812/cee352999c1014e84bb3685e0470f306.jpg)(https://uploads.tapatalk-cdn.com/20170812/fc9ac18ede90cea633a5f11db95fac17.jpg)(https://uploads.tapatalk-cdn.com/20170812/924dcb3b76600c331497a37f7a5b7d53.jpg)(https://uploads.tapatalk-cdn.com/20170812/246a1a3120dc9273882de1a3a200c584.jpg)(https://uploads.tapatalk-cdn.com/20170812/1f34b98ff8c328a679bcacbba39a72c3.jpg)
Bought some new reverse cone 'mufflers' with no internal baffles
(https://uploads.tapatalk-cdn.com/20170812/99c6f7948117e7fee64dc1832db748f7.jpg)
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:37:48
Cleaned up my switches and fitted gp style levers
(https://uploads.tapatalk-cdn.com/20170812/812fadf033b5f80a326c891f168aaa06.jpg)(https://uploads.tapatalk-cdn.com/20170812/365182611153d89dfdbe42e2d3d4f9b7.jpg)
Title: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:38:55
Decided to wet sand and polish the forks again too
(https://uploads.tapatalk-cdn.com/20170812/054fce10c1f88871115d53b86fff2773.jpg)
Decided to polish up my pipes too despite there being a dent in one (https://uploads.tapatalk-cdn.com/20170812/2782a2ddf1d328933bd97d56f9aa5f7f.jpg)(https://uploads.tapatalk-cdn.com/20170812/18139a30119f3cedfb7f34706e6fb5de.jpg)(https://uploads.tapatalk-cdn.com/20170812/d79b3ab3154cb808ef9cc880b95223b7.jpg)
Title: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:42:38
Had a go at relacing my wheels and fitted them up to see how it all looked
(https://uploads.tapatalk-cdn.com/20170812/732f058c782b3152a05121a1bc09669a.jpg)(https://uploads.tapatalk-cdn.com/20170812/8a65356c57f928fd8617c61533ee9b9b.jpg)(https://uploads.tapatalk-cdn.com/20170812/210df220f44dd83a3d9ac4804b0e8872.jpg)(https://uploads.tapatalk-cdn.com/20170812/6044cdd8732065dea722ac7597425d9b.jpg)
Obviously I still need to tighten all spokes, have to respray the hoops so that will happen following
Title: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:52:49
Made a fibreglass pan for upholstering and glued in some closed cell foam
(https://uploads.tapatalk-cdn.com/20170812/61f4b0cc8ab2088af69389bdb6203b07.jpg)(https://uploads.tapatalk-cdn.com/20170812/495b7d4266023b8f270361eed6b3364d.jpg)(https://uploads.tapatalk-cdn.com/20170812/6a8e200473f8ecff288c8159cc1e878a.jpg)(https://uploads.tapatalk-cdn.com/20170812/795913f33c00c33279e44a6cba90325c.jpg)(https://uploads.tapatalk-cdn.com/20170812/19bc8f4ac317ce5248e957bd2633662e.jpg)
Tried some diamond pattern then flat vinyl but didn't like the seat thickness as it makes the rear jump useless so I pulled it all off
(https://uploads.tapatalk-cdn.com/20170812/96c854a1b0df7ee912c73025fd414944.jpg)(https://uploads.tapatalk-cdn.com/20170812/54bd09eb2c25f711802e0678bb8734f3.jpg)
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:54:39
Decided to try and use the baffles out of the original mufflers so I chopped them up and slid it in the new case. Will see how it all goes.
(https://uploads.tapatalk-cdn.com/20170812/6bfda959b60a7c76e4eb7c654ea76588.jpg)
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 04:57:08
Sprayed my air filter covers Ford Blaze red then decided it would look odd with red below the horizontal line of the tank and seat so painted them black. This is the red I will be using for the tank and seat.
(https://uploads.tapatalk-cdn.com/20170812/3dc932b3c9892f7c517c6e8a19882105.jpg)(https://uploads.tapatalk-cdn.com/20170812/071e18e81aa3171bb8754ae926549271.jpg)(https://uploads.tapatalk-cdn.com/20170812/bea8bda9c4c6d714cb079181567916b1.jpg)(https://uploads.tapatalk-cdn.com/20170812/3c687582a7f6a5112501cdfd675bb3f1.jpg)
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: bvonroth on Aug 12, 2017, 22:27:27
Got the seat painted today. Wondering if it needs some silver highlights to make it pop against the black of the frame.
(https://uploads.tapatalk-cdn.com/20170813/1f7a22a4ebc520972422d350022597ac.jpg)(https://uploads.tapatalk-cdn.com/20170813/fa0be45718689f086a935386b85eb2b4.jpg)(https://uploads.tapatalk-cdn.com/20170813/8e94c7918f377da2def9b9dc022df60f.jpg)
Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: Mr Bernzo on Aug 13, 2017, 08:02:28
Tidy work, coming along very nicely.

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Title: Re: 1973 Honda CB250 Twin - Australian Build
Post by: Uglyrabbit on Aug 14, 2017, 17:24:44
Your bike is making me want a Honda!


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