1978 Honda cb400t cafe (first build)

Hello, Im new to cafe racers and bike building but have been working on cars since grade school. I quickly became tired of riding an R6 everyone had and want my next bike to have a more class with the comforts of modern suspension. I purchased a 1978 cb400t for $400,

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Not registered but who cares i can deal with it (i checked it wasn't stolen no back fess, just paper work). the engine started up and ran, it idled with a little help from the throttle. i wasn't able to ride it as it was missing a tank which i just purchased for $170 shipping included,

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but was able to get the gears through 1-5 while just rocking it back and forth so at least those all work. I figure the engine will need some work just not 100% sure what quite yet , it has 11k so its been sitting. I want to install a 2005 cbr 600 rr or similar fork assembly

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although im not sure how the bolt up will work yet either but know its possible. Ideally I want to use spoke wheels and have already found some

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but am a little concerned with the end look of cb400 spoke wheels with cbr600 rr forks. I am starting to lean toward the cb1 400 wheels

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For the seat frame i will weld the U cafe seat tube

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The seat itself i have yet to design or realy think about

For the rear shocks I was thinking about (anyone please advise) these:

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I truly am not set on them, i want to find a better quality being these are on ebay for $150 (even less) and from china i don't trust they'll last or even be safe, any recommendations here would be appreciated.



i plan to further clean the engine and want to paint it black while cutting the edge of the finns for that two tone look the frame itself i will have taken apart this weekend and will send it to get sand balsted and powder coated... (black?). I know there's alot I've missed and like i said im new so any insight is greatly appreciated and if im just completely off please share your opinions the parts ordering has begun.
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

I f you have any fab skills I suggest chopping the subframe and building a new one to change the geometry. It'll like it.
 
1978 Honda cb400t cafe/streetfighter build (beginning)


Joon-yah Bourelle said:
I f you have any fab skills I suggest chopping the subframe and building a new one to change the geometry. It'll like it.

I second that. Fuck that frame. Wishing I would have before my buddy started my seat.

For you, I would check out some CB360, CB550 and even the other makes like the KZ550 frames to get an idea of what would be ideal, (as far as flat goes). It will make that seat setup and overall appearance much more appealing and easy to work with.
 
1978 Honda cb400t cafe/streetfighter build (beginning)

Junior, don't do that. Now I'm depressed. Haha
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

I have absolutely no fab skills, but I have found since your posts, a few fab shops in the area so i'm thinking ill pick up some tubing and away i go.

I'm now i really want to change my swing arm too ... cb1 400 would just need to be shortened a bit.

got alot more to think about now.
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

Don't get the frame powdered until you know you have cut/grinded/welded everything you need to. Leave it til the very end of the build if needs be. You can't really touch up powder like you can paint if you realise you missed a tab or two!
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

Yeah im bringing into a fab shop to see if this place knows what there doing and will do what i need.

Wow just got that beast started.. decided to see if the motor was any good being how clean it is and all ... boy oh boy am i the sucker who bought a clean motor that seeps from its gaskets !!! doesn't have to run long to show smoke coming from the oil touching the case. in diff areas. but the engine seemed to have some power i didn't ride it but rev'ed it up..had some back fires here and there not sure what that's from but now that i have the leaks it doesn't matter ill be ripping the engine apart as soon as i unbolt it... damn i guess i cant complain i cant really expect much from 40 + year old gaskets.

SHould i scrap this pile or turn it into gold???

Ive never rebuilt a motor but i guess since ive already ordered the 170 tank i will just do it....

Anyone ever rebuild these? any advise or forewarning appreciated.
 
1978 Honda cb400t cafe/streetfighter build (beginning)

Buy a manual. An FSM (Factory device manual) and/ or a Clymer manual. Don't be afraid to dig in and for God sakes don't even think about scrapping that ! The manuals will be your bestfriend during "surgery" on the engine. Just be sure to take your time.

If you feel the need to ask question use the search bar to see if the issue you are having has been address and answered by another member. If all else fails, ASK!

This site will motivate you like none other and will at times be more helpful than the manuals (especially during "brain farts" moments)
 
1978 Honda cb400t cafe/streetfighter build (beginning)


Joon-yah Bourelle said:
Lmao,Drey6. heres a pic of the first cm I built. Subframe is a lil less complicated but still works n looks good. Feel free to hit me up if ya need any tips or advice.

Of course, thanks for the offer!
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

Just got it all off i'm going to roll it into a fab shop on Monday since everyone's close tomorrow and use the day to get started on that engine. Why the f do all the compression tester gauge ktis i find exclude the adapter for this motor???

I found the honda shop manual.. http://www.mediafire.com/download/cnkmdznfjgz/HSM+Cm-Cb400low.pdf

is clymers better?
 
1978 Honda cb400t cafe/streetfighter build (beginning)

Not sure on that adapter, dude.
The Clymer manuals have additional pictures and a bit more explained. It's good to have the Clymer next to the FSM during use to ensure accuracy. Overall, Clymers are solid.
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

Both have the pros and cons, I used both the Honda and Clymer when I worked on mine. These engines are pretty straightforward to rebuild, just take your time with it and it will go smoothly.
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

They are not bad to rebuild and they are pretty solid motors. Once it's tuned they make decent power.
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

Can anyone recommend the steel tubing wall thickness that is best for fabing a sub frame? im about to order the tubes and dont wan to get something something that's to hard to bend or something that wont hold up because its thin.
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

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Just need to take out the air box and wiring sh'ell be ready for welding... once the tubing layout is designed that is.

Gasket kit coming on Thursday hopefully my piston rings are good and i won't have to do a total top end overhaul.. ill find out in the next day or so as i disassemble it.

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1978 Honda cb400t cafe/streetfighter build (beginning)

My CB400F had 2mm thick tube on the rear section. 2mm will be a bugger to bend though.
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

I ended up ordering the 17 gauge which is 1.473 mm so i'm hoping this isn't to thin and should be plenty easy to bend. (crossing fingers)
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

michaelcafefighter said:
I ended up ordering the 17 gauge which is 1.473 mm so i'm hoping this isn't to thin and should be plenty easy to bend. (crossing fingers)
you'll be good
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

Alright finally got the top end of the engine rebuilt fresh gaskets and new piston rings with an extensive cleaning of valves and pistons..

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I've also finished designing my sub frame

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I love it , i know its simple but i love that its 100% different than the bogus sub-frame that it came with. Its in the fab shop getting welded together now. Im a little stuck on the front end... still trying to find an 18" spoke wheel off of a cb (does it even exist?). I still need to order the forks but am hesitating on account of not being able to find a rim yet... i saw new spoke wheels but at 200 plus a pop id rather wait and refurb a used one since i'm powder coating anyways.
 
Re: 1978 Honda cb400t cafe/streetfighter build (beginning)

thats gonna look good
 
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