Big engines in little bikes
12-09-2008 | 11:06 PM
#1
Thread Starter
Senior Member
SuperSport
Joined: Jun 2005
Posts: 524
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
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
12-10-2008 | 02:14 PM
#10
Senior Member
Back Marker
Joined: Sep 2008
Posts: 210
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
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
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.
12-10-2008 | 10:16 PM
#13
Thread Starter
Senior Member
SuperSport
Joined: Jun 2005
Posts: 524
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
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
12-11-2008 | 11:08 PM
#15
Senior Member
SuperBike
Joined: Oct 2008
Posts: 1,033
12-12-2008 | 04:08 PM
#18
Senior Member
SuperBike
Joined: Jan 2007
Posts: 2,166
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
chk out Slot's YSR! 600-400 = 200cc / 400 = 50% increase, try 250 - 80 = 170 / 80 = 212% increase
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