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Big engines in little bikes

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Old 12-10-2008, 12:06 AM
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Big engines in little bikes

This is Truckinducs fault by the way, when he posted pics of his latest project.
I thought I'd show pics of a couple of bikes that I built.

The first one is an '86 250 Ninja with a 600cc Rotax motor shoehorned in.
Works performance rear shock and EX500 forks with a mix and match of Yamaha and GSXR brake parts.
I built it back in '89, put 20,000 miles on it and sold it about 3-4 years ago to buy my XR650R/SM. (That makes that bike the same age as truckinduc, kinda ironic)

The second one is a work in progress.
It's a 1989 CB400 aka CB1 that has a built CBR600 F3 motor for power. It was started by a friend of mine and I mechanically finished it about 4-5 months ago and put about 3000 miles on it since.
I was supposed to take it apart, once I knew it worked, and powdercoat the frame/swingarm black and paint the tank/fender and cowl in pearl white, too much fun riding it.
Speaking of which, any recommendations for affordable paint and powder coaters in So Cal ?

Kai Ju
Attached Thumbnails Big engines in little bikes-image032.jpg   Big engines in little bikes-image017.jpg   Big engines in little bikes-image019.jpg   Big engines in little bikes-dsc_1407a.jpg  
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Old 12-10-2008, 12:10 AM
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The CB1 looks like tons of fun.... it'd have to awfully cold outside for me to want to tear it down for paint.

I''ve always wanted to stuff a KX450F or KX500 motor into a new EX250.
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Old 12-10-2008, 12:22 AM
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kai ju, you don't post all that often, but when you do you steal the show. Nice work as always.
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Old 12-10-2008, 12:30 AM
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I've seen an old vintage Mustang with a big modern Harley engine in it. Looked pretty good too.
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Old 12-10-2008, 07:42 AM
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Love that CB1. Is the engine a direct fit?
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Old 12-10-2008, 10:54 AM
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Nice work kai ju!
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Old 12-10-2008, 11:30 AM
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What great work. The Ninja looks like it could have come from the factory. Must be a LOT of fun to ride.
I put a Yamaha 600 single in a Bultaco Astro. Quite a track bike.
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Old 12-10-2008, 11:53 AM
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i love the cb
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Old 12-10-2008, 03:12 PM
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Originally Posted by B R View Post
I've seen an old vintage Mustang with a big modern Harley engine in it. Looked pretty good too.
How is 60hp going to move a mustang????
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Old 12-10-2008, 03:14 PM
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Originally Posted by kai ju View Post
This is Truckinducs fault by the way, when he posted pics of his latest project.
I thought I'd show pics of a couple of bikes that I built.

The first one is an '86 250 Ninja with a 600cc Rotax motor shoehorned in.
Works performance rear shock and EX500 forks with a mix and match of Yamaha and GSXR brake parts.
I built it back in '89, put 20,000 miles on it and sold it about 3-4 years ago to buy my XR650R/SM. (That makes that bike the same age as truckinduc, kinda ironic)

The second one is a work in progress.
It's a 1989 CB400 aka CB1 that has a built CBR600 F3 motor for power. It was started by a friend of mine and I mechanically finished it about 4-5 months ago and put about 3000 miles on it since.
I was supposed to take it apart, once I knew it worked, and powdercoat the frame/swingarm black and paint the tank/fender and cowl in pearl white, too much fun riding it.
Speaking of which, any recommendations for affordable paint and powder coaters in So Cal ?

Kai Ju
VERY sweet bikes! I would love that Rotax/Ninja, and the CB looks like a Hawk GT.
I just am finishing restoring a nice old XR350 trail bike. But now I'd REALLY like to have that motor in a CR frame.
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Old 12-10-2008, 03:56 PM
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I had a CB1 and i wanted to put a F3 motor into it. All the CB1 guys said it couldn't be done... Liars. I had dreams of a sub-400# 100hp streetfighter. I'd love to hear more about it.
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Old 12-10-2008, 08:11 PM
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The vintage Mustang refered to, is a small motorcycle (think Cushman)
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Old 12-10-2008, 11:16 PM
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Thanks guys,

The Rotax powered Ninja was a fun bike to build and a real hoot in the canyons.
But man was it a pain around town, it would sometimes die just as the light turned green and with the kickstarter on the left it was a real pleasure to get going again.
It weighed only 315 lbs with a full tank of fuel, did killer stoppies and wheelies and could hold it's own against much bigger bikes. I do miss it.

The CB1, or CB1.5 as I call it, on the other hand feels just like a typical Japanese bike. Fires right up, doesn't stall or leak and is wicked fast, twisties or straight line.
I had it on a frineds dyno and it showed 94 hp at the rear wheel. There were files for three other F3's which were all in the mid 80's.
A good friend of mine started the project ten years ago but never finished it. He did all the hard work, like getting the engine lined up in the frame and fabricating the front motor mount, machining the rear sprocket carrier to line up the chain run etc.
When I asked him whether he ever finished the bike he said no and asked if I wanted it.
I couldn't say no to that, could I now ?
I finished the rest of the mounts, modified the F3 airbox to fit under the tank, installed a 599 radiator, CBR600RR gauges and a whole bunch of other stuff.
Like the flyscreen that is an upside down helmet faceshield.........

I'm glad you guys like them.
As always questions are welcome.

Kai Ju
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Old 12-11-2008, 11:25 PM
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Originally Posted by trackdayhawk View Post
The vintage Mustang refered to, is a small motorcycle (think Cushman)
There you go, I knew someone would know what I meant.

Like this
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Old 12-12-2008, 12:08 AM
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Originally Posted by MLB View Post
VERY sweet bikes! I would love that Rotax/Ninja, and the CB looks like a Hawk GT.
I just am finishing restoring a nice old XR350 trail bike. But now I'd REALLY like to have that motor in a CR frame.

Do it! cant be any harder than what im doing
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Old 12-12-2008, 08:06 AM
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Brilliant work kai ju!

Chris.
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Old 12-12-2008, 02:52 PM
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Originally Posted by Truckinduc View Post
Do it! cant be any harder than what im doing

No, but your skill can be a lot better than mine. (guaranteed)
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Old 12-12-2008, 05:08 PM
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https://www.superhawkforum.com/forum...ad.php?t=16937

chk out Slot's YSR! 600-400 = 200cc / 400 = 50% increase, try 250 - 80 = 170 / 80 = 212% increase
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Old 12-12-2008, 05:22 PM
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I WIN

Ha ha, how about a Husaberg 470 in a ZB50 frame?

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Old 12-12-2008, 07:23 PM
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Originally Posted by Truckinduc View Post
I WIN

Ha ha, how about a Husaberg 470 in a ZB50 frame?



I'm not trying for anyone to win. As a forum member if you built what is in the pics, that "kicks ***" quite literally.
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Old 12-12-2008, 07:50 PM
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I was just playing around. I just found that bike, its pretty radical.
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Old 12-26-2008, 04:19 AM
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I'm currently building a YSR80 which i have now fitted with a 250cc 4 stroke

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Old 12-26-2008, 08:04 AM
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damn good luck trying to keep the front wheel on the ground on that thing. but it is super cool...
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Old 12-26-2008, 09:26 AM
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YSR80 +

Hey Slot,

Keep the pics coming, that looks really clean so far.
What's the donor bike for the forks, or is that what YSR80's come with in the UK ?

Kai Ju
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