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Author Topic: Honda 750 Nighthawk  (Read 9914 times)
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Gimpy Joe
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« Reply #30 on: April 04, 2011, 11:07:17 PM »

The problem is that by the time I've spent all the time and money to make the CB750 fast, I could have just bought a faster bike. I could put over $2,500 into the CB750 motor and still have under 100 horsepower. I love my CB for riding around town pretending to be a cafe racer, but as a LSR bike I don't think it adds up. Any thoughts?
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Nortonist 592
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« Reply #31 on: April 04, 2011, 11:20:39 PM »

Leave the Nighthawk engine alone and concentrate on streamlining.  You'll be surprised how much free horsepower there is in reduced drag.  Plus if this is your first trip to Bonneville you don't want to bring some engine that is on the ragged edge and spend a week trying to get it sorted.
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Get off the stove Grandad.  You're too old to be riding the range.
wobblywalrus
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« Reply #32 on: April 06, 2011, 12:31:51 AM »

Joe, you are a young guy at 21.  The future is in water cooling, electronic fuel injection, computerized engine management, etc.  My advice is to start out with as modern a bike as you can afford.  Do not dump a lot of money into it.  Simply learn how all of the systems work, data collection, EFI and ignition chip programming, modern chassis setup, intake and exhaust tuning, how to ride, traction control, streamlining, etc.  All of these skills need to be mastered to be competitive during your career.  The sooner you get started the better you will be.
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Gimpy Joe
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« Reply #33 on: April 06, 2011, 12:49:32 PM »

So today was an interesting day. We split the cases on my old '76 CB750A Hondamatic, hoping against hope we wouldn't find bits of metal in there. Turns out it is absolutely pristine inside! We're going to replace the seals and bearings and button it up. We completely rebuilt the top end last month so we know that it's good.

Because the 'matic is much better inside than I thought it would be, I think I will ditch the Nighthawk idea.

NEW PLAN: I will use my 1976 CB750A for my LSR project. It may not be the fastest, prettiest, most modern bike out there, but
1. I already own it
2. I am in love with it
3. It is begging to be turbocharged. The stock cam and lower compression ratio are perfect.

Now I just have to figure out how to change the topic title  undecided
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Old Scrambler
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« Reply #34 on: April 08, 2011, 08:04:21 PM »

Just suggestions.............up the front sprocket to 19 (from Cycle-X); smaller rear sprockets; extra chain and master-links; larger carbs from a standard CB750 K1-K6; Jets from 105 to 120; Free-flowing air-intake but in a box; 4-1 header; Prep the bike for the Salt and you should do 120 or better.  Another low-buck motor wake-up is switch the cam to a CB750 F2 (Black Motor).  You can return the bike to near stock and continue to ride it on the street when you get home.
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
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