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Author Topic: 78' KZ400B - another rabbit  (Read 2275 times)

Offline john83

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Re: 78' KZ400B - another rabbit
« Reply #10 on: Apr 12, 2018, 22:47:04 »
Might as well see if it runs at least.

Offline canyoncarver

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Re: 78' KZ400B - another rabbit
« Reply #11 on: Apr 13, 2018, 00:11:42 »
Might as well see if it runs at least.

Yep.   It' would eat at me otherwise. 

I think I've decided not to sell it for awhile.  I still have the spare motor, it's an earlier version but it's "supposedly" out of a running bike.  The po believed the motor locked up so they got the spare but never did the swap.  It was so cheap I didn't question it and just loaded it up.  I got it home and it turned by the kicker just fine, feels like it has compression.  I suppose I'll find out whats up when I finish prepping to start it. 
« Last Edit: Apr 13, 2018, 00:40:01 by canyoncarver »
--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, 73 Norton Commando, my 93" shovelhead chop, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
--

Offline JustinLonghorn

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Re: 78' KZ400B - another rabbit
« Reply #12 on: Apr 13, 2018, 14:47:58 »
Do. It.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline freemonty

  • Posts: 25
Re: 78' KZ400B - another rabbit
« Reply #13 on: Apr 14, 2018, 11:33:33 »
Iíve gone through a full resto, top end rebuild of a 76 Kz400, so if you do end up doing it and have a question I may be able to help.

I have to agree with one of the earlier responses though. You could spend thousands and do all the modifications in the world but youíll never be able to squeeze the horses out of these motors to make this bike exciting. Trust me Iíve tried. One day Iíll explain this in my unfinished build thread...

That doesnít mean Iíd sell it though. Itís a reliable, easy to work on bike. I think a tracker build would work if you lightened the piss out of it.

Hereís mine:
KZ400 Resto-mod
 https://r.tapatalk.com/shareLink?share_fid=9366&share_tid=74009&url=http%3A%2F%2Fwww%2Edotheton%2Ecom%2Fforum%2Findex%2Ephp%3Ftopic%3D74009&share_type=t

Offline freemonty

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Re: 78' KZ400B - another rabbit
« Reply #14 on: Apr 14, 2018, 11:39:15 »
Oh god that pictures awful. Thatís not the finished bike! How does it decide which picture from the thread is going to be used for the thumbnail

Offline Nebr_Rex

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Re: 78' KZ400B - another rabbit
« Reply #15 on: Apr 14, 2018, 22:43:08 »
    There is no need to swap heads. The only difference between the late 400 and the 440 is
bore size, cam chain and kick start. The thing that holds the KZ400/440 back is the cam timing.
Intake lobe center is 113*. The cam needs to be advanced. KZ900/1000s are 110* from the
factory and some have degreed them down to 102*. KZ650s and KZ750s are 105* and that is
what most street racers set their bikes to 'back in the day'.
    The 440 head flows very well. It is a scaled down version of the GPz1100 Unitrack. The only
 thing it would need even for a mildly modified engine would be a little clean up for core shift.
    Cam chain on the 400s is a roller and a Hyvo for the 440. There are ways with both of
these to advance the cam with no machine work. As for carbs most people use to large of a
unit hurting throttle response.


.

Offline canyoncarver

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Re: 78' KZ400B - another rabbit
« Reply #16 on: Apr 15, 2018, 15:27:56 »
Neat bike Monty, I love the stock hard bags on these. 

Nebr, as always, thanks and keep it coming.   

After putting a few beers into my wife last night, she took another look at the bike and somehow became interested.  Even this morning after she woke up I had her look at it again just to be sure.    Yep, looks like I should get it running ( as cheap as possible , ie, skipping all the head upgrades etc..) and let her ride it.   I don't doubt it'll be a snoozer, she's used to her 2014 FZ6R but she seems to think the 400 is cute so I'll stick with it awhile.



« Last Edit: Apr 15, 2018, 15:29:41 by canyoncarver »
--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, 73 Norton Commando, my 93" shovelhead chop, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
--


Offline canyoncarver

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Re: 78' KZ400B - another rabbit
« Reply #18 on: Apr 16, 2018, 11:56:09 »
Speaking of rabbit holes:

--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, 73 Norton Commando, my 93" shovelhead chop, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
--

Offline doc_rot

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Re: 78' KZ400B - another rabbit
« Reply #19 on: Apr 16, 2018, 13:27:41 »
is that a giant hole in the piston?