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Author Topic: Another Honda CB400F cafe racer  (Read 63894 times)

Offline swan

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Re: Another Honda CB400F cafe racer
« Reply #60 on: Apr 06, 2013, 21:57:52 »
Thanks Worst. Thinking hard about the 305.

This CB400F is up for sale and I will let you know how it goes.

http://minneapolis.craigslist.org/hnp/mcy/3732892913.html
« Last Edit: Apr 09, 2013, 14:21:11 by swan »
1966 Triton cafe, 1962 BSA Gold Star DBD34, and 1966 T120 Triumph Bonneville.
BSA Gold Star barn find restoration
1975 CB400F Cafe Racer build
1966 Triumph Bonnevile restoration

Offline braveg

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Re: Another Honda CB400F cafe racer
« Reply #61 on: Apr 08, 2013, 12:48:33 »
Damn, if only shipping this bike to SA didn't cost as much as the bike I would buy it in a heartbeat! Crank up that price man, someone is getting it at waaaay too much of a bargain :o beautiful work, I have 4 of these babies in my garage in various stages of restoration and I know just how much work goes into doing a build of this quality, the new owner is going to be a lucky, lucky person.

Well bloody done!

Offline Maritime

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Re: Another Honda CB400F cafe racer
« Reply #62 on: Apr 08, 2013, 14:00:57 »
I sooo wish i had the dough to take this off your hands Swan, it is a super fair price for that bike! I want one badly, but I have no disposable income for it and won't for at least another 2 years. Maybe the next time you flip one I will be ready.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline NeightRG

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Re: Another Honda CB400F cafe racer
« Reply #63 on: Apr 08, 2013, 15:40:48 »
Renting the same workshop as Swan, I've had the privilege to watch this build (and plenty more of his work) very closely. Whoever buys this bike is in for a real treat.
Top Gear fans will know what I mean, when I say that the sound of that 4 into 1 exhaust with the repacked Dunstall style muffler really brings on "the fizz"
Not even my bike, and it'll be hard to watch it leave the shop.

Offline MotorbikeBruno

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Re: Another Honda CB400F cafe racer
« Reply #64 on: Apr 17, 2013, 11:15:04 »
Was looking through CL today and saw your bike. Amazing for sure.  I hope this goes to a good home, and gets ridden, if I had the cash I'd be all over this thing as I've ONLY heard good things about how they ride.  Good luck with the sale man.

Offline swan

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Re: Another Honda CB400F cafe racer
« Reply #65 on: Apr 18, 2013, 12:28:42 »
Thanks all. I have had several nibbles, but no bites yet on the sale. I may go to E-bay next.
1966 Triton cafe, 1962 BSA Gold Star DBD34, and 1966 T120 Triumph Bonneville.
BSA Gold Star barn find restoration
1975 CB400F Cafe Racer build
1966 Triumph Bonnevile restoration

Offline hondacycle

  • Posts: 4
Re: Another Honda CB400F cafe racer
« Reply #66 on: May 14, 2013, 23:04:17 »
Thanks all. I have had several nibbles, but no bites yet on the sale. I may go to E-bay next.
I'll be watching this build very closely... Closer than most. Looking good.

Hi my name is Norman.

 I am currently working on a 76' CB400F. My delima is, does this engine require 8 valve stem seals or 4? I noticed the intake valve guides are different from the exhaust valve guides. I have a genuine Honda Service Manual as well as a Haynes Service Manual. The Honda manual say's it requires 8. The Haynes manual say's it requires 4. If it  truly only requires 4, Which side do they go on intake or exhaust. Now I did attempt to install all eight, however when the seals are placed on the exhaust side the inner valve spring is rubbing on the valve stem seal. HELP!
Norman

Offline o1marc

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Re: Another Honda CB400F cafe racer
« Reply #67 on: May 14, 2013, 23:13:00 »
Thanks all. I have had several nibbles, but no bites yet on the sale. I may go to E-bay next.
I tried to pull up your ad but it says it was flagged and removed

Offline M. Wolfe

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Re: Another Honda CB400F cafe racer
« Reply #68 on: May 30, 2013, 18:16:32 »
I am having a challenging time getting my bike to idle correctly with individual K&N pod filters. There are dozens and dozens of threads online (Do the Ton, SOHC, Yahoo Auto Groups, et al) discussing this very problem and most say it cannot be done. It can be done and I have successfully run pods on three other CB400f's using stock exhaust, dropping the needle clip one notch and running 80 or 85 main jets. This bike has a repacked Dunstall replica muffler (which sounds awesome!), stock 4 into 1 header, 80 main jets, raised the needle one notch (lowered the clip, enriching the mixture to compensate for more incoming air) and a #38 pilot jet. I have quadruple checked timing, ignition, valve clearances and confirmed there are no vacuum leaks. The carbs, floats levels all passageways etc have been meticulously cleaned several times and set to spec. I am at 700 feet elevation and it is generally in the 50's farenheit when I am doing test runs and plug chops. The bike runs extremely well above the idle circuit, but down low it idles high, hangs, then drops down to a too slow of an idle. This has nothing to do with mechanics of the carbs (slides, springs, throttle cables etc) I believe one or more of the pilot jets are fouling, causing the idle to drop. This has made synchronizing the carbs at idle difficult.

Well, last night I did a series of compression tests with the engine cold, wide open throttle (WOT), cold with a bit of oil squirted into the cylinders and WOT and after I ran the bike around for awhile. Cylinders 1,2,3 were consistently in the 130's psi on all tests with my cheapie compression gauge. Cylinder #4 was 75 psi cold, 85 with oil added and 80 psi after running, telling me there was a leak in the valves, not the rings or cylinder on #4. I checked the torque on the cylinder head and all bolts were tight and to spec. There are no air leaks around the cylinder head or gasket area. So, off with her head-I ripped her down to lower end last night. I knew the chamber of cylinder #4 had some pitting and corrosion which came with the bike. I did lightly lap the valves with rough and fine compounds when I rebuilt the motor.

#4 on the right, note the pitting.

What I discovered was some of the pitting and corrosion was also in the inlet valve seat of #4, allowing for a slight leak, causing the low compression reading. In a dark room, I shined a strong led flashlight into the inlet and exhaust ports and discovered two tiny light leaks on the inlet valve seat, the culprit of my compression leak. If I did it right the first time, I would not be doing this now.


I am meeting with a machinist friend today who has the proper sized valve seat cutters. Hopefully, we can lightly cut the valve seat in order to remove the two small areas of pitting without having to replace the whole valve seat (time and $$$$).

As long as I am at it, I am replacing the kick start quadrant with a slightly used one with better splines than my original.


With 4 cylinders of even compression I should have an easier time dialing in and synching the carbs and fixing the idle problem. I'll post my results, stay tuned....

I am a new biker and i know that is not easy to get fixed on your bike.. hehe.hehe.
« Last Edit: May 30, 2013, 22:50:53 by M. Wolfe »

Offline swan

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Re: Another Honda CB400F cafe racer
« Reply #69 on: Jun 16, 2013, 17:59:29 »
I do not want to deal with E-bay. I rode it yesterday and this is such a great bike, but I need to let it go. Relisted it on Mpls Craigslist:
http://minneapolis.craigslist.org/hnp/mcy/3875009767.html
1966 Triton cafe, 1962 BSA Gold Star DBD34, and 1966 T120 Triumph Bonneville.
BSA Gold Star barn find restoration
1975 CB400F Cafe Racer build
1966 Triumph Bonnevile restoration