Articles and road tests

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Ibsen
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Articles and road tests

Postby Ibsen » Fri Mar 03, 2006 1:15 pm

I have got a number of scanned 650 articloes and road tests. As sonn as I have them uploaded to a server, I'll post the links here.

Here is one:

May 1979

cb650
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Postby cb650 » Wed Mar 08, 2006 12:35 pm

In the old 650 site there was a breakdown on all the diffrent models you got across the pond.
Some where 64 hp and others had 50. I'm interested in the cam specs that where listed to compare to what I have here. Can you get these Ibsen?




Terry

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Ibsen
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Postby Ibsen » Wed Mar 08, 2006 1:22 pm

The cam specs are:

For the 46kw(63hp) version: cam lobe diameter 35.6mm IN and 35.3 EX , parts number pn 14101-426-000.

For the 37kw(50hp) version: cam lobe diameter about 33.1mm, parts number pn 14101-426-690.

cb650
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Postby cb650 » Thu Mar 09, 2006 7:17 am

Thanks!!!!!! I'll post what I find out.



Terry

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Postby cb650 » Fri Mar 10, 2006 7:32 am

Our cam in the states is the bigger one. Figured it would be as the bikes here where rated 63
also. Why the smaller cam in some? Also where did you get the specs for the smaller cam?
I think also the 650 cam is the same as a performance 550 cam. Need to get a 550 cam to check its journals and centerlines.




Terry

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Ibsen
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Postby Ibsen » Fri Mar 10, 2006 8:23 am

Robert posted the specs for the different cams and I wrote them down because I needed the info when I purchased a spare cam.

The reduced effect had something to do with German rules I believe.

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Postby Volker_P » Fri Mar 10, 2006 8:57 am

German motorcycle assurance prices in the eighties were quite high. Some dealers even wrote down the insurance price next to the sale price (one year third party insurance alone was about 20% of the new sale price of a motorcycle :shock: ). The step from below and above 50hp was about a factor of two, so almost all manufacturers offered 50hp versions in Germany.
I can confirm the specs given by Ibsen. They are easy to distinguish even without measurement as the 50hp lobes are symmetric while the 63hp are not. I try to attach a picture to show that. However it may vanish after some time:
Image

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Postby cb650 » Fri Mar 10, 2006 3:05 pm

That is a big diffrance. I'm trying to investigate putting a hipo 550 cam in instead of going through the expence of having a 650 cam reground. On place had a 550 cam with the same lift as the 650 another has about 1 mm more. Wonder what it would gain in hp? Dont want anything radical just little more.



Terry


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