Assuming Professor Surfswab* is correct - and they changed both the
bore and stroke - you would be able to relatively easily bore the
cylinders out, but not change the stroke without either changing the
heads or the crankshaft - either of which would be a fairly big job
although the latter would require an entire engine teardown.
Ok - I'm going to play devils advocate here - 700ccs - 175ccs
per cylinder (Yes, I know, it probably isn't exactly 700ccs - but I'm
doing quick math) going to 750 would push each cylinder to 187.5 ccs
per cylinder. 12.5 CCs per cylinder.
Using the rated horspower of the 450 NH (33 HP) and the
displacement - 447 CCs to be exact - .0738 HP per CC of displacement.
Multiplying by 12.5 CCs that would equal .923 HP / increase per
cylinder - or 3.692 HP total.
Ok - now I know that I'm not working with exact numbers here and
I'm guessing that the per CC output of a 450 is the same as a 700
(which I'm almost certain it isn't - but its the only number I had) my
point being - even if you assuming all this is accurate and I'm off by
say 25% to the low - thats around 5 HP gain for a potential total
engine teardown and rebuild.
Ummmm.
I don't think its worth it - but thats me.
Other thoughts?
-Joey
*A Term of Affection :-)
On Wed, May 11, 2011 at 9:37 PM, Dave <[email protected]> wrote:
> now the question becomes... how hard is it to make the 700s into a
> 750s, and is it worth the conversion (if possible?)
>
> On May 11, 5:37 pm, surfswab <[email protected]> wrote:
>> The story, 700 vs. 750, is:
>>
>> When homegrown Harley Davidson was struggling financially back in the
>> 80s, the company successfully lobbied our congress for an embargo
>> against imported bikes 750 and larger, in order to stifle competition
>> -- it was and still is, called protectionism, and still goes on in
>> some parts of the world despite mostly free markets everywhere. The
>> Japanese had done the same against Harley early on (pre-Honda) when
>> they were struggling to establish their motorcycle manufacturing
>> industry.
>>
>> But in the case of the Nighthawk, Honda modified the 750, which was in
>> full production everywhere except the U.S., by reducing the
>> displacement and tinkering with the bore and stroke, to bring it in at
>> less than 750 cc, thereby circumventing the embargo.
>>
>> Long story short, the bikes are virtually identical except for
>> displacement (and maybe kilometers vs. miles on the speedo).
>
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