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Old Streetfighter Motorcycle Forum Post 03-06-2012, 02:49 PM   #151
Crom_child
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Default Re: 1978 XS400 CAFE Build

Real nice work... clean bike

XS400 DOHC motor being bored to accept GS500 liners & pistons ...




Left is GS500 piston 1 mm o/s, right is XS400 dohc stock piston @ 69mm.


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Old Streetfighter Motorcycle Forum Post 03-06-2012, 04:12 PM   #152
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Default Re: 1978 XS400 CAFE Build

Thanks. ^^^^^Nice dude, keep me posted on how it turns out.

"Oh my god look at this, it's a machine! You know, your like looking into the mechanism of the universe..."
-Indian Larry-

Current build, check it out.
xs650 Brat Tracker:http://www.customfighters.com/forums...ad.php?t=57958


78 XS400 CAFE build (SOLD): http://www.customfighters.com/forums...ad.php?t=53414

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Old Streetfighter Motorcycle Forum Post 03-06-2012, 05:09 PM   #153
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Default Re: 1978 XS400 CAFE Build

I want to do a big bore on mine too!!!!!

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Old Streetfighter Motorcycle Forum Post 03-06-2012, 11:41 PM   #154
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Default Re: 1978 XS400 CAFE Build

Dunno who owns the whole hog DOHC XS400/GS500 hybrid motor.
Hell of an upgrade...
Saw the machining pics on Photobucket.

Let's see an XS under 400 lbs. w/ 60 +/- h.p. hmmmm

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Old Streetfighter Motorcycle Forum Post 03-07-2012, 12:50 AM   #155
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Default Re: 1978 XS400 CAFE Build

Quote:
Originally Posted by Crom_child View Post
Let's see an XS under 400 lbs. w/ 60 +/- h.p. hmmmm
You mean a stripped down xs650?

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Old Streetfighter Motorcycle Forum Post 03-07-2012, 08:18 AM   #156
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Default Re: 1978 XS400 CAFE Build

...a late Maxim DOHC mega-sized 500cc engine swapped into a 77-78 XS400 frame.
The pic below is a stock 82-83 XS400 dohc.
.


The following is directly related to this thread: engine upgrades ...

Per Yamaha specs a stock 38 hp '77-78 xs400 model = 186 kg. / 409 lbs.
Tossing the stock fenders / seat / pod etc. a cafe'd xs400 could weigh less
- say around 280-285 lbs.?

The 1982 XS400-R DOHC engine produces "45 hp / 9,500 rpm"
Given its advanced architecture it's likely a dohc xs400 motor makes
an actual 49-50 hp in top tune (+ low miles).

Option 1: GS based 510cc
Depending on carbs / cam / exhaust a modded XS400 dohc engine, taken to 510cc,
may be able to produce 60 hp @ 9,500 rpm. although this goal requires a flowed cyl. head.
I'm thinking of a mega engine being equipped w/ Yoshimura DOHC cams.

Option 2: less is more ... 440cc
A DOHC XS400 engine can be over bored using Kawa gpz1100 pistons > gives 440cc.
Engine remains fairly stock; one may be able to keep the original cyl. liners.
Should make 49.5-50 h.p. using stock components, big exhaust.
Yoshimura used to make piston kits & cams.

Option 3: 440cc + Flat slide carbs
Adds estimated 4-5 hp. .... for 54 h.p. total.

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Old Streetfighter Motorcycle Forum Post 03-07-2012, 01:53 PM   #157
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Default Re: 1978 XS400 CAFE Build

I wonder what mine weighs, I need to get her on a scale. I know the stock mufflers and center stand had to make a huge dent.

"Oh my god look at this, it's a machine! You know, your like looking into the mechanism of the universe..."
-Indian Larry-

Current build, check it out.
xs650 Brat Tracker:http://www.customfighters.com/forums...ad.php?t=57958


78 XS400 CAFE build (SOLD): http://www.customfighters.com/forums...ad.php?t=53414

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Old Streetfighter Motorcycle Forum Post 03-07-2012, 02:55 PM   #158
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Default Re: 1978 XS400 CAFE Build

since we started on my build i'm sure my bike lost at least 40 pounds.

It's always better on wheels.







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Old Streetfighter Motorcycle Forum Post 03-07-2012, 04:10 PM   #159
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Default Re: 1978 XS400 CAFE Build

Hmmm wonder what mine weights?

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Old Streetfighter Motorcycle Forum Post 03-07-2012, 05:19 PM   #160
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Default Re: 1978 XS400 CAFE Build

Before I started changing everything with the motor swap my 360 was on track to be real close to 300 pounds wet. I would imagine your xs400 could be close to that.

The gs750 should be able to get under 400 pounds wet. You seem to be using a lot of steel in your build so my guess is you'll be around 430-450 wet.

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