Author Topic: heffay's 75/77 cb400f race project pix and the onslaught of questions  (Read 34264 times)

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Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #50 on: August 05, 2008, 11:46:13 AM »
anyone have the quick and easy on a complete rewire?
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline CharlieT

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #51 on: August 05, 2008, 02:30:54 PM »
anyone have the quick and easy on a complete rewire?


When I builtthe replica, I eliminated virtually the entier stock wiring harness and just made my own for what little I needed. Had the old complete harness laying around here. WOuld have been an easy "plug 'n play" replacement for you.

















But I threw it out last spring.
A good bike mechanic only needs two tools, WD40 and duct tape. If it doesn't move, but should, use the WD40. If it does move but shouldn't use the duct tape.

Offline Triffecpa

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #52 on: August 07, 2008, 03:05:48 PM »
Heffay

Is your goal to make a track bike or a street bike?

These bikes will bump start with ridiculous ease, so including a starter really isn't necessary.

I've done a couple of track bikes.  Fire away with the questions.

Tracy

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #53 on: August 07, 2008, 03:10:26 PM »
no, kidding... i just noticed the other day, your racebike... hence, the nomination.

track bike for sure.  that is why i asked you what class because i was told there wasn't a proper class. 

i'm not sure what the hell i've been waiting for on this project and i think it all comes down to sohc4.net being quite interesting and time grubbing. 
 ;D 8) ;D

w/ all the parts i've acquired, i might be able to have a running and hot little racer... i just don't want to open the cases nor do i want to put the motor back in the frame.   :-[  i know, i'm a lazy ass.
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #54 on: August 07, 2008, 03:11:48 PM »
but apparently i flirt well!!!!    ;D ;D ;D




































 :-* ;)
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline Triffecpa

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #55 on: August 07, 2008, 03:35:27 PM »
OK, here's the quick and dirty run down of what you need for a 400F track bike.

tapered steering head bearings

decent rear shocks.  Get them 13.5+ inches long.  I bought the Midi Forsa ones for a CB1100F.  The springs are a little stiff, but not too bad.

put 20w fork oil in the front forks.  pull out the springs and collapse the forks and put oil to 4" from the top.  Reinsert the springs and you're done.

cut a slice out of the rear of the stock header where the muffler fits on.  Then weld it back together so that it angles up at about 25 degrees. Put any small muffler on there that you want.

have a braided stainless brake line made up for the front brake.

run clubman bars

run street compound Avon Roadrider tires.  100 on the front and 110 on the rear.

put a Dyna S ignition on it

pull the air box off and use the rubber boots that fit from the carbs into the airbox as velocity stacks.

toss the speedo and move the tach to the middle of the upper triple clamps.  try and rubber mnount it if possible

bend some 1/2" wide strap steel from Home depot.  Drill a hole in it and fit it to the upper shock mount.  run it back about 10 inches and bend it 90 degrees, go 2 inches and bend it 90 degrees back again and mount it to the hole in the back end of the frame.  These are for your rear number plates.  Take two more pieces of strap steel.  put a 90 degree bend in them about 4 inches from one end.  mount them to the top triple clamps.  There are two bolt holes there for something.  You want the pieces to point downwards about 9 inches.  mount the front number plate to these.

put a plastic 16oz catch bottle into the space taken up by the stock airfilter and run the top end breather hose into it.

for a wire harness, run 14 ga wire from the positive side of the battery to a toggle switch mounted to a piece of strap steel bolted into the right mirror mount.  from there run another wire to the coils.  split it and power both coils and the Dyna S ignition.  Run the black and white wires from the Dyna to the  other terminals on the coils.  Pull the rotor and charging coil off the left end of the engine.  Pull the starter out and buy a rubber expandable plug from Home Depot to fill in the starter hole.  coat the plug with 1104 gasket sealer and don't over tighten it.  toss all the remaining electrical parts and wiring.

that's about it.

There are upgrade things to do after you get the bike running and sorted out.

The front forks are kind of spindly.  I think that they are 33mm.  I used a VF500F Interceptor front end on one of my bikes.  Had to have the fork tubes shortened by about 3", but other than that it was a bolt on fit.  I used a later model 5 hole Honda brake rotor, drilled to match the four hole 400F hub and had a custon caliper bracket made up to mount a twin piston EX500 caliper.  The bike stops about 10 times better and the forks don't shimmy like the old ones did. 

I've never had my engine apart.  Ran the piss out of it for several seasons.  ran stock carbs and the bike pulls really well. 

thats about it.

TR

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #56 on: August 07, 2008, 03:51:42 PM »
its amazing how alike you and i think...

i planned to use the rear of the frame for number plates and envisioned what i see on yours.

sold the speedo and saved the tach.

need rear shocks.

plan to use my viper fairing and fiberglass the headlight hole into a rounded front w/ number. 

i've got a shorty super trapp.  maybe you noticed.  will go nicely w/ my stock headers from a 14 dollar ebay score.   ;D

i actually prefer drag bars and have them... how insistent are you w/ clubmans?

i'll be running pods... we'll see how that works.  one of my big "i don't want to do it"s is cleaning the carbs... they've been sitting open air for a long time.

i needed and have been looking for that specific type of help w/ the electix... THANK YOU

i may have a blown tranny from what i remember the PO saying... i have a good one on hand... only reason for ever taking the motor out!

oh yea.. the best part... girlfriend has an EX500, i used to own one and always knew they were bare bones race stock... i'm hoping 78550k comes thru w/ that EX parts bike for free that he's been promising... that'd make this project that much closer.   ;D  hint hint nudge nudge

« Last Edit: August 07, 2008, 03:54:08 PM by heffay »
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline Triffecpa

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #57 on: August 07, 2008, 05:16:56 PM »
well, let's see.

If you don't want to clean your carbs, but you might have a broken trannie, you have some problems...  :)

If you like the drag bars, use them.  I prefer clip ons, but $20 Bikemaster clubman bars work about as well, and cost $80 less.

pods are fine, but as a wise man once said...  "race bikes should only use velocity stacks.  Dust you say?  That's what new piston rings are for..."

On race bikes, my philosophy is to get it onto the track ASAP.  Then you can figure out what really needs changing and what doesn't.  I have guys I know that refuse to take the bike to the track until they have all of the upgrades done.  The end result is that the bike never makes it to the track, because it's never really finished.

You'll also want to put a 15 tooth sprocket up front in place of the stock 17. 

An electric tach is a nice upgrade for Phase II also.  I cut up a ZX900 instrument cluster ($15 on Ebay) and used it.  Big improvement.

Rear sets are another nice upgrade.  I welded a four inch piece of angle iron to the frame and bolted on some FZR rearsets.  About $50 on Ebay.

The MRA guys in Colorado do not have any vintage guys racing.  You can do AHRMA races in Salt Lake City and in Albuquerque.  You can also come down to ABQ and race with us monthly, April to October.

Most trackday organizations though will allow most any kind of bike on the track as long as it is in good repair and has good tires.  Usually no safety wiring is required either.

Obviously with the limited electrical, you'll be running a total loss ignition system.  Typically a fully charged battery will last a trackday.  The bike will start to miss at high RPM when the battery starts to run low.  To be on the safe side, charge it at lunch.

Again, you're welcome to come to ABQ and ride one of my bikes anytime.

Trackdays down here cost $75-95.  Leather rentals are another $25.

Tracy

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #58 on: August 15, 2008, 11:02:23 AM »
ok, its obviously been a while since i uncovered the engine that has been sitting on the garage floor... i dug in, FINALLY, last night and started tearing down.  now, that i have a work bench in the garage, it makes the whole process a lot easier.  i was doing it in the basement but the pets live down there too and i was nervous about any fumes.  also, the motor in the basement and the rest of the bike in the detached garage makes for a not very workable situation.  after rearranging the garage and feeling much better about working in it... i'm ready to move forward.  here's the minimal amount of progress i made last night in between the beer drinking and whatnot. 

of course there are the occasional stripped heads...  sometimes the impact can even mangle things... dremel'd it into a flathead screw and impacted it out w/out further delay


of course there are the occasional stripped heads... what, wha?  another one!?... this one was on the 350f parts machine.  i noticed i don't have the sprocket cover on the 400f engine so i'll be swapping the 350f one over to the 400f.  i checked the fit and it seems fine... any clearance issues anyone knows of?  should trick all my race opponents into thinking i've got one less gear than they do!  haha!

oh yea, this one was just barely reachable w/ the dremel due to other parts in the way... just got one side grounded into a flathead and it came out like butter too!!   2 for 2!


this engine is DIRTY!  trying to keep as much out as possible but it still sneaks in w/ all of the disassembly.  i'll have to clean and inspect very well if i want to keep this thing running longer than a few miles.









engine building station... or is that, engine un-building station   ;D




the growing parts cache...

the head and all the top end stuff is still in the basement... yay for piles of parts EVERYWHERE!   ;D 8) ;D
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline Triffecpa

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #59 on: August 15, 2008, 02:11:50 PM »
Heffay

One thing that I do with my race bikes is to cut the sprocket cover back so that you can swap the front sprocket out without having to remove the cover.  You can see the "V" shaped area on the back side of the cover.  Remove that area and then you will have ready access to the countershaft sprocket without having to remove the cover, which over course requires removing the shift lever and linkage and maybe the footpeg and who knows what else.

I try and only swap front sprockets on my track bikes.  It has less of an impact on the length of the drive chain and I'm not personally good enough to tell a one tooth difference on a rear sprocket anyway...

TR

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #60 on: September 28, 2008, 04:51:06 PM »
Going to the Sandia Classic in Albuquerque a couple of weeks ago really got me going to get the bike set up for next year.
still need essentials like tires and leathers and odd bits that will just require a pocket book.

BUT!

i had fun this weekend  ;D ...  pulled the nasty fender off the 350f donor that many of you have parts from.  Drilled the rivets and removed the stocker from the bracket.  true value helped out w/ some chrome acorn nuts and...

oooooohhhh   aaaaaaahhhhhh...





finally got up the nerve to yank the entire electrical system from the bike...



cleaned up the rolling chassis... should be good for about 5 less pounds.   ;D



a couple shots of the day i can't help but include... 
87 kawi ex500, 86 yami srx6, 73 honi cb350f



dirty, dirty kawi zx7r... thank you sandia classic trip!



and last but not least... the seat is in progress by a professional seamstress.   ;D  i am remodeling her house and get a seat out of the deal.  while i do enjoy paisley and snowflakes... i think they are best suited for the mock up!   ;D  i hope to show up to my remodel tomorrow and fresh new marine grade vinyl race seat.   8)
(i cut down a stock seat, made a quick tissue paper pattern and she's doin' the rest)







you know the build is on when you start to dream about it.   ;D 8) ;D
« Last Edit: September 28, 2008, 04:52:40 PM by heffay »
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #61 on: September 28, 2008, 05:02:36 PM »
oh yes... the thought of the day...

red number plates w/ black carbon fiber numbers.  i found some carbon fiber bulk sticker but can't remember where, if you have links i would appreciate it.
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline Ecosse

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #62 on: September 28, 2008, 05:08:10 PM »
Dig the fender! And you holding up the harness reminds me of a B horror movie... ya know, intestines an' stuff. ::)


Sorry, thinking about Halloween I guess.


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Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #63 on: September 28, 2008, 05:12:17 PM »
notice the sidecovers too.   ;)

only coils and plug wires remain!  i kinda feel like i won the battle and scalped her afterward.   :-\  i will repent by rebuilding to leaner and faster specs! 

Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #64 on: September 28, 2008, 05:13:21 PM »
oh whoops... in her side covered, fendered glory

Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline walkingchaos

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #65 on: September 28, 2008, 05:23:00 PM »
I WANT THAT FENDER!!!!!!!!!!! . . . . where did you have it made ?
73' CB750 Cafe Racer
76' CB750 Frame . . . possible project

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #66 on: September 28, 2008, 08:42:27 PM »
the difference in weight from stock fender to carbon fiber is immense!  5 pounds maybe?!

i got the fender and sidecovers half price on ebay from what the original purchaser paid at ttr400.com... seems he didn't want them very much and i did   :)   
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline tsflstb

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #67 on: September 28, 2008, 09:56:28 PM »
If I remember you wanted that fender and sidecovers about $5 more than I did...damn they look nice. 

I want to see dyno runs with and without the carbon fiber pieces.

Offline walkingchaos

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #68 on: September 29, 2008, 01:02:51 PM »
would that front fender fit a cb750 ?
73' CB750 Cafe Racer
76' CB750 Frame . . . possible project

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #69 on: September 29, 2008, 05:21:35 PM »
talk to ttr400 (a member here)... i bet they could make you one. 
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline DarkRider

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #70 on: October 01, 2008, 03:53:20 PM »
Another member that could make you one is Funjimmy.
'84 Chevy C10
'73 MGB Roadster
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Currently a rider without a bike

Quote from: heffay
so, you say just tie myself on with this... and steer w/ this?   ;D ;D  ok.  where's my goggles?   8)

Offline FunJimmy

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #71 on: October 01, 2008, 10:54:33 PM »
Another member that could make you one is Funjimmy.


Thanks for the vote of confidence but my front fender mold looks quite different and a bit wider to fit a 110 tire.

Heffay

That 400 is looking real nice. Can’t wait to see it all finished.

Cheers
Jimmy
You never see a motorcycle parked outside of a psychiatrist's office!

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http://forums.sohc4.net/index.php?topic=27159.0

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #72 on: October 08, 2008, 07:30:01 PM »
proof that we're looking at an (at one time) stock 400f seat...






and the outcome...













works for me!   ;D 8) ;D
« Last Edit: October 08, 2008, 08:18:10 PM by heffay »
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline cleveland

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #73 on: October 09, 2008, 07:49:21 AM »
Very nice! 

Offline heffay

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Re: heffay's 75/77 cb400f race project pix and the onslaught of questions
« Reply #74 on: October 09, 2008, 07:52:59 AM »
thank you... now i can go to work.   :D :D :D
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f