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Author Topic: Why only build one 400f race bike?  (Read 3381 times)

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Offline Kashmired

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Why only build one 400f race bike?
« on: January 28, 2014, 02:53:01 PM »
5 years ago about this time i got my first motorcycle. it is a nearly stock 1977 Honda CB400f. it had sat in a guys garage for about 15 years then it sat in my dads motorcycle shop (Valley Cycle Service in East McKeesport) for another about another 10. in half an hour i had it running then after a minor restoration i learned to ride on it. that first day out on the road i knew i had to build one into a race bike. since then I have bought 2 more for parts and the intention of building one for just that. Fast forward to a couple months ago i was talking to my friend who is currently building an old Norton into a race spec street bike and he agreed to not only help me build mine but also build his own. tonight we will be starting to tear them down with the hope to have them ready for the May 10th WERA race at Summit Point.  Here is our starting point









i have been doing alot of research on here for the past couple months and so far have decided that to stay within WERA's rules for V2 and Formula 500 (http://maps.wera.com/rulebook/?x=1098#ch11)

So far it seems like we will be going with a stock motor, may upgrade some internals (oil pump, cam chain tensioner, but can not do an overbore), Removing the charging system, Bore the stock carbs, Pod filter or velocity stacks, Cb550 triple tree,  forks, axle, and hub, 2 dual piston brakes (probably from a 81 cb750f) in the front, stock swingarm (for now anyway) with stock rear wheel and brakes, a cafe style seat, stock gas tank, clip on handlebars, stock exhaust header, aftermarket muffler, and a small viper fairing.



any and all suggestions are welcome, ill do my best to keep this thread up to date
« Last Edit: January 28, 2014, 02:57:55 PM by Kashmired »
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Current Collection: 1977 Honda Cb400f
1981 Honda Cb750f (Cb900f Motor, Mototech Ontario 1000cc Kit)
1989 Honda CB-1
1992 Honda CBR600 F2
1972 Kawasaki F7
1973 Kawasaki F7

Offline thirsty 1

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Re: Why only build one 400f race bike?
« Reply #1 on: January 28, 2014, 04:29:22 PM »
Right on! Looking forward to the transformation.
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73' CL125, 75' CB400F, 16' KTM 1190R, 05' KTM 525EXC

75' CB400F  -  http://forums.sohc4.net/index.php?topic=127295.0

My 79 CB750F for fun   ----   http://www.dotheton.com/forum/index.php?topic=19923.0

Offline seanbarney41

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Re: Why only build one 400f race bike?
« Reply #2 on: January 28, 2014, 04:41:35 PM »
I'm always up to watch people go racing, 'cus I hope to do it myself someday soon.
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If it works good, it looks good...

Offline 2strokeTrush

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Re: Why only build one 400f race bike?
« Reply #3 on: January 28, 2014, 07:15:11 PM »
Good looking start! Interested!
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If You Aint First Your Last!!

 350F project-http://forums.sohc4.net/index.php?topic=133079.0

500F Project-http://forums.sohc4.net/index.php?topic=135660.0

Offline Mugen_Stumpo

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Re: Why only build one 400f race bike?
« Reply #4 on: January 29, 2014, 03:35:13 AM »
WOW!!!!

go go go 8)
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Offline Kashmired

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Re: Why only build one 400f race bike?
« Reply #5 on: January 29, 2014, 09:52:54 AM »
had about an hour and a half with them last night so still just tearing it down, hopefully i will have a bit more time tonight and have it down to just the motor in the rolling frame

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Current Collection: 1977 Honda Cb400f
1981 Honda Cb750f (Cb900f Motor, Mototech Ontario 1000cc Kit)
1989 Honda CB-1
1992 Honda CBR600 F2
1972 Kawasaki F7
1973 Kawasaki F7

Offline Roach Carver

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Re: Why only build one 400f race bike?
« Reply #6 on: January 29, 2014, 10:46:46 AM »
count me in!
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Offline Kashmired

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Re: Why only build one 400f race bike?
« Reply #7 on: January 29, 2014, 10:49:04 AM »
im trying to do some research on how to fit a gl1000 oil pump into the motor and i can't find a good article or forum post. anybody have a good link?
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Current Collection: 1977 Honda Cb400f
1981 Honda Cb750f (Cb900f Motor, Mototech Ontario 1000cc Kit)
1989 Honda CB-1
1992 Honda CBR600 F2
1972 Kawasaki F7
1973 Kawasaki F7

Offline bwaller

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Re: Why only build one 400f race bike?
« Reply #8 on: January 29, 2014, 12:01:57 PM »
Don't know about the GL1000 pump, but check the 400f oil pump upgrade on www.TTR400.com
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Offline Kashmired

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Re: Why only build one 400f race bike?
« Reply #9 on: January 29, 2014, 12:31:56 PM »
ya ive seen that, im on a very tight budget with a giant pile of used parts so im gonna figure out how to do it. i read an article once that had instructions but i cant find it...
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Current Collection: 1977 Honda Cb400f
1981 Honda Cb750f (Cb900f Motor, Mototech Ontario 1000cc Kit)
1989 Honda CB-1
1992 Honda CBR600 F2
1972 Kawasaki F7
1973 Kawasaki F7

Offline bjbuchanan

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Re: Why only build one 400f race bike?
« Reply #10 on: January 29, 2014, 06:56:21 PM »
Pm me if you want my viper fairing. It has about 10 miles on the new windscreen, maybe that much
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The dirty girl-1976 cb750k, Ebay 836, Tracy bodykit
Round top carbs w/ 38 pilots, middle needle position, airscrew 7/8ths out, 122 main jet
Stock airbox w/ drop in K&N, Hooker 4-1

Don't trust me alone with a claw hammer and some pliers

Offline Just4fun

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Re: Why only build one 400f race bike?
« Reply #11 on: January 29, 2014, 07:56:34 PM »
Kevin at TTR is a really great guy and an amazing resource for us 400 guys. 

He does sell a completely updated oil pump which I will be using in a performance build.  When he builds the oil pump, he also replaces the correct seals and thoroughly tests.  It is not inexpensive, but for the time he invests I think he provides great value.

If that kind of upgrade is not in your budget, he also provides documentation on how to do the modification.  You go to the link posted above and click on the blue link on his main page to get the document.  You would need some help from a machinist, but you can take a look.


Sent from my iPad using Tapatalk HD
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Offline Kashmired

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Re: Why only build one 400f race bike?
« Reply #12 on: January 30, 2014, 12:15:13 PM »
Quote from: bjbuchanan on January 29, 2014, 06:56:21 PM
Pm me if you want my viper fairing. It has about 10 miles on the new windscreen, maybe that much

thanks but i already have them

@Just4fun thanks i found the link, i have access to a small machine shop so i should be able to handle it
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Current Collection: 1977 Honda Cb400f
1981 Honda Cb750f (Cb900f Motor, Mototech Ontario 1000cc Kit)
1989 Honda CB-1
1992 Honda CBR600 F2
1972 Kawasaki F7
1973 Kawasaki F7

Offline Kashmired

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Re: Why only build one 400f race bike?
« Reply #13 on: February 05, 2014, 03:09:45 PM »
Well i have not gotten to work on this for a few days. If you look closely at the far left side of the second picture you can see the edge of a drain, well saturday it decided to send raw sewage spewing out, so needless to say the whole garage reeks of chlorine now. also it seems like my friend is considering building a different bike so i may be only doing one now. ill keep you all updated
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Current Collection: 1977 Honda Cb400f
1981 Honda Cb750f (Cb900f Motor, Mototech Ontario 1000cc Kit)
1989 Honda CB-1
1992 Honda CBR600 F2
1972 Kawasaki F7
1973 Kawasaki F7
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