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Author Topic: CB750A BHP and SPEED  (Read 3133 times)

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Offline clintcd

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CB750A BHP and SPEED
« on: January 10, 2013, 09:45:12 AM »
Hi, Can anybody tell me if the power output of 47 bhp for the 1976 model was the same for the 77 and 78 models. I know the carb jetting was different but I can not find any reference to the power output for the later models.

Thank you
« Last Edit: January 14, 2013, 08:09:56 AM by Sam Green Racing »
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Offline raymond10078

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Re: CB750A BHP and SPEED.
« Reply #1 on: January 10, 2013, 10:35:32 AM »
Good question!  I can't find the number published anywhere (for the 77/78 bikes) - yet - but I'll keep looking.

However, since the cam/head/pistons all stayed the same for the 76 through 78 A bikes, I doubt that the HP rating changed either . . . .
« Last Edit: January 14, 2013, 08:10:33 AM by Sam Green Racing »
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1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.

Offline Bill/BentON Racing

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Re: CB750A BHP and SPEED.
« Reply #2 on: January 10, 2013, 02:23:23 PM »
38.9 rwhp according to Cycle or Cycle Guide on 76.Doubt any difference for 77-78.Reg K model usually 49-51 RWHP.67 @ crank,you lose an extra 10-12 thru T/C!!! Samauto"s last dyno run(wasn't broken in) was 87.07!!! ;D Bill
« Last Edit: January 14, 2013, 08:10:59 AM by Sam Green Racing »
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Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
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Offline Sam Green Racing

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Re: CB750A BHP and SPEED.
« Reply #3 on: January 14, 2013, 08:09:21 AM »
Billy, I wonder what speed Samauto would reach if it wasn't geard right down for the quarter?
We know it reaches about 93mph at the 8th mile when shifting into high gear and has touched 116mph at the stripe, that's your next chalenge. ;D ;D ;D ;D ;D ;D ;D

Sam. ;)
« Last Edit: January 14, 2013, 08:11:25 AM by Sam Green Racing »
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C95 sprint bike.
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JMR Racing CB750A street ET drag bike

Offline Retro Rocket

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Re: CB750A BHP and SPEED
« Reply #4 on: January 14, 2013, 01:42:03 PM »
CB750A BHP and SPEED = oxymoron.... ;D ;D ;)
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Offline Sam Green Racing

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Re: CB750A BHP and SPEED
« Reply #5 on: January 14, 2013, 02:13:07 PM »
YES but I am a nice Oxymoron. ;D ;D ;D ;D ;D ;D ;D ;D ;D
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C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

Offline dusterdude

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CB750A BHP and SPEED
« Reply #6 on: January 14, 2013, 02:18:26 PM »
He meant moron
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Offline Bill/BentON Racing

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Re: CB750A BHP and SPEED
« Reply #7 on: January 14, 2013, 03:19:49 PM »
Bet it would do 150 mph +  ;D.....@ least 140+ :D Bill
Sam, wanna do Bonneville next year or year after....I'm game! 8)
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BentON Racing Website
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Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
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See our latest build 'Captain Marvel' CLICK HERE

Offline jweeks

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Re: CB750A BHP and SPEED
« Reply #8 on: January 14, 2013, 03:42:06 PM »
     Gotta love the optimist! My bet would be lower 130's. My "big" Hondamatic motor made 100 horses at the rear wheel and had 124 mph trap speeds. A naked bike is a big brick cutting through the air. I'm running a quarter fairing on my drag bike that helps a little. Kinda like cutting a square foot off of the 4X8' plywood sheet that I'm pushing down the road. ;)

                                                        Jon Weeks
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Offline Bill/BentON Racing

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Re: CB750A BHP and SPEED
« Reply #9 on: January 14, 2013, 05:59:00 PM »
Well,if I was trying for top mph I'd add some aero along with changing gearing etc.!!!! ;) ;D Bill
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BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB750A BHP and SPEED
« Reply #10 on: January 14, 2013, 06:21:52 PM »
Bonneville, hell yeah. You have a place to stay on the way and another drinking err pit crew member. In light of the recent legalities however I'm not so sure that you should stop over for anything but gas...................

I'll save some cardboard so we can make that air cutting fairing Jon refers too... Jon you gotta come along. Who would we rib if you aren't here  ;D
« Last Edit: January 14, 2013, 06:26:54 PM by Jerry Rxman Griffin »
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline jweeks

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Re: CB750A BHP and SPEED
« Reply #11 on: January 14, 2013, 06:57:57 PM »
That's what phone's are for..... ;D ;D ;D

                        Jon W.
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Offline raymond10078

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Re: CB750A BHP and SPEED
« Reply #12 on: February 10, 2013, 03:35:57 PM »
Quote from: clintcd on January 10, 2013, 09:45:12 AM
Hi, Can anybody tell me if the power output of 47 bhp for the 1976 model was the same for the 77 and 78 models. I know the carb jetting was different but I can not find any reference to the power output for the later models.

Thank you

From a Honda site, the 47 HP applied to the 77 model too.  I know it is a EARA model - but it is clearly a 77.  I realize that 47 PS is slightly less than 47 HP - but it is close enough . . . .

http://www.honda.co.jp/news/1977/2770421.html
« Last Edit: February 10, 2013, 03:37:36 PM by kandrtech »
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1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.
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