So me and a friend were talking and he is getting a cb750. He thinks he will be able to smoke me on it. I looked up the specs and that bike has like 68 horsepower. Criticize if you want but do you guys think that is possible with his stock 750 vs my cbr 600. Also what is the difference between our engines he said he has DOHC.

 

the old cb750s?

Google Image Result for http://motorbike-search-engine.co.uk/classic_bikes/1972_CB750.jpg

that bike?

 

I doubt his would win but then again if you suck at shifting he has a chance. I beat a gsxr 750 but the dude didnt know how to shift.

 

No the 1984 nighthawks. With dual overhead cams

 

84 Nighthawk S? 84-86's were only 700cc's if sold in the US.


Back then there were federal limitations on importing bikes larger than 700cc (guess even back then Harley needed federal bailouts).

Love these old bikes though - would love to find one - almost bought one right before I picked my F2 up.

Warn your buddy though - those bikes had a common problem with the alternator/starter - they were chain driven to the crank, and that chain and tensioner is prone to failure. Replacing means pulling the motor and splitting the case. Expensive as hell for a shop to do, but not that huge a deal if willing to do the work yourself.

 

First off - you know what dual overhead cams are, right? Your motor has them too. Means the camshafts sit on top of the valvetrain, instead of the valvetrain being actuated by pushrods from below (Like a typical American V8 motor).

the 84-86 700S was rated at about 80hp, and had a wet weight of about 495lbs. So - it was a little down on power from a stock 94 600F2 (Rated at 100hp) and was a touch heavier. That being said - it probably has plenty of get up and go- and I bet it has a pretty stout bottom end and mid range.

 

Those old cb750's are great bikes. Ive got a ol 80' CB750C im working on.

 

Your bike is faster... But those old bikes are a lot faster than you think. He may give you a good run if you raced from a stop up to like 50 of 60 mph.

 

Your bike is faster for sure. It depends who is the better rider.

 

At the lower end rev range, your going to be surprised. Those old in line 4's have plenty of bottom & mid range grunt. That's how they built them then. My old 81 Z650 only did just over the ton (105mph?), but didn't take a lot to get it there & in the twisties its bottom end & engine braking where great. However the F's is lighter, greater top end speed, better handling (suspension & frame), clearance & brakes. But its all a mute point, it also depends on the skill & commitment of each rider. If its just a p*ssing competition, tell him you love his "Old" classic.