Author Topic: 2 stroke cb700?  (Read 1142 times)

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Offline De250r

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2 stroke cb700?
« on: May 30, 2013, 05:09:35 PM »
I have lots of different Powersports parts available and I'm a machinist. I'm kinda fascinated by older 2 strokes triples but the price to get into one and maintain with parts is too high.
I've also found myself with  a cb750 bottom end from 75. During the winter I run a Yamaha vmax 700 snowmobile that has the sweetest sounding and running  2 stroke triple in it that makes 115 horse with single pipe stock. My idea is to replace the crank in the 750 block with a shaft with just the tranny sprockets and a sprocket on the mag side. Then deck the block as low as possible. Then mount the 700 2 stroke on top where 750 cylinders/head used to live. I don't think it will actually b much higher than the stock 750 with all it crown on it head. Then instead of a cvt style snowmobile clutch run a sprocket spinning the sprocket on 750 block. Use kick start from the cb750. Use electrical from 700 snowmobile which is way better then the cb.
It would b tuned down from 115 hp due to exhaust I would imagine and then it will loose power through the cb crank and what not. So maybe 80hp or so. How much power is the cb750 bottom end good for?
I like challenges and pulling into the local waterhole on something and having people be like what is that. nd I think this would do it. My current cb build is getting closer to completion so im thinking of what's next. What do u guys think?
Kinda like this drawing sorry its crude

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« Last Edit: May 30, 2013, 05:19:22 PM by De250r »

Offline Jim F

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Re: 2 stroke cb700?
« Reply #1 on: May 30, 2013, 05:56:49 PM »
why not put a 1000cc SOHC motor
 in your sled and still have something to talk about at your favorite bar
just my 2 cents worth

Jim
2002 RC51 1000 (SP2)
1983 GS1100EC Suzuki
2002 998 Dukati (Customers Bike)
1992 KTM500 2 stroke
1975 CB750/836 Honda
1978 GS750/840 Suzuki

Offline De250r

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Re: 2 stroke cb700?
« Reply #2 on: May 30, 2013, 07:03:11 PM »
I was thinking snow chopper out of my 76 cb750 kinda like this


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Offline scottly

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Re: 2 stroke cb700?
« Reply #3 on: May 30, 2013, 07:08:23 PM »
 :-X
Don't fix it if it ain't broke!
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Offline 754

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Re: 2 stroke cb700?
« Reply #4 on: May 30, 2013, 07:41:32 PM »
There is a sled here called X Rated...Kawi dragbike four with a Magnussen blower..its pretty fast..
 How are you going to seal the lower. End, fit ballbearings in and deal with the wide camchain gap ?
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