I love building old motorcycles and working on them i have always rode old bikes. The kids at school always make fun of what i ride. They all ride new bikes would it be posible to build a cb750 that could take a r6?
3800cafe
I guess you've never ridden an R6, or any modern sportbike.
The difference between a CB750 and a Yamaha R6 is like...
a Ford Model T and this years Ferrari F1 car. Seriously. The 2006 R6 redlines around 16000rpms and makes about 110hp, all from 600ccs. You're CB750 might make.... 60hp at 7000rpms?
Funny what happens with 30 years of development on the sportbike cutting edge. The only way you could "beat" a R6 is on the cafe looks department... and of course, beauty is in the eye of the beholder.
The difference between a CB750 and a Yamaha R6 is like...
a Ford Model T and this years Ferrari F1 car. Seriously. The 2006 R6 redlines around 16000rpms and makes about 110hp, all from 600ccs. You're CB750 might make.... 60hp at 7000rpms?
Funny what happens with 30 years of development on the sportbike cutting edge. The only way you could "beat" a R6 is on the cafe looks department... and of course, beauty is in the eye of the beholder.
Who was the dude on the tower of Pisa with the cannonball and the marble? Galileo? Didn't he prove that more mass doesn't fall faster? Does that apply to a CB750 and an R6 at all? Could I ask ANY more questions?
Also, don't let those beaters clown you about riding an old bike. They've got no imagination. You'll have the last laugh when they wrap themselves around a tree anyway.
Z
Also, don't let those beaters clown you about riding an old bike. They've got no imagination. You'll have the last laugh when they wrap themselves around a tree anyway.
Z
In a vacume items of different mass fall at the same rate. In the real world masses of different Density fall at different rates due to the resistance of air.
For instance...a balloon and a pea that weigh the same, will fall at the same rate in a vacume, but at a different rate in air...due to the difference in density and aerodynamics.
I figure the extra heavy CB750 would fall faster than the lighter R6...even though the R6 is more aerodynamic. But...I guess if the R6 fell nose first it might win anyway.
JohnnyB
For instance...a balloon and a pea that weigh the same, will fall at the same rate in a vacume, but at a different rate in air...due to the difference in density and aerodynamics.
I figure the extra heavy CB750 would fall faster than the lighter R6...even though the R6 is more aerodynamic. But...I guess if the R6 fell nose first it might win anyway.
JohnnyB
Cycle Xchange claims they can build a 1061cc Sohc (Cb750) motor that will put out 130+ Horsepower at the rear wheel. M3 racing builds Sohcs to 96 rw HP with a 1mm overbore (approx 760cc). They also get their bikes down to something like 375lbs dry weight. I'm pretty sure a 375lb, 130 HP Cb750 would kick an R6's ass (in a straight line at least), but you'd probably be able to buy an R6 for the money spent to get it there. If I was rich I'd do it just to see the look on the R6 owner's face (I'd build a completely stock looking Cb, too). Jimmy
No....
I have a friend who raced cb750s for 20 years. His garage looks like Russ Collins took a shit on every shelf (points for the people who know who russ collins is). At one point he had cb750 drag bike that ran 9's. this is probably about the fastest I have ever heard a single motored N/A cb750 go. It was bored to 1036ccs, ran race gas (actually nitro) had a dedicated chassis, was maximized fof straight line, and was no where even close to street legal. Also it took all of a two lane road to make a u-turn. Cycle world managed to take a brand new R6 and with a couple of ratcheing tie downs and some dropped dogbones managed to go 9's with a street legal and registered R6.
I have heard about cycle ex's calims and that is for crank HP, somehow a lot more hp will get lost in the cb750's gearbox on it's way to the rear wheel, that is if the cb750 gearbox could handle the power (doubtful). The biggest thing to consider is that a stock cb750 overheats in traffic, a bored cb750 will have a complete meltdown in traffic if stuck long enough. An R6 will sit and idle all day long.
He never said it had to be a brand new R6. And I doubt any high school kid could run as fast as a hired gun at Cycle world. If I ever get rich you'll see. If I have to turbo and nitrous inject the thing and strap rocket boosters to the seat I'll do it just to prove an old Cb750 can kick an R6's ass. Jimmy
P.S. He never said it had to be street legal.
P.P.S. RC Engineering, raced multi-engined Cb dragbikes. Where are my points?
P.S. He never said it had to be street legal.
P.P.S. RC Engineering, raced multi-engined Cb dragbikes. Where are my points?
Everybody who knows me knows I eat, sleep, and crap cb750s (the 77-78 K bikes are the hardest to pass). Currently I have 6 bikes from early K's to dunstall Super Sports. I have had or ridden most of the hot setups out there. The point of a cb750 is nolonger to be the fastest baddest muthafucker on the planet, there is something else that the bike delivers that a new r6 or r1 cannot and that is a raw riding expirence.
I have a 1986 ninja 1000R and at 100mph on the slab that bike is boring. It feels stable, sure, the wind isn't even that bad, it is just really boring. On the highway with the cb750 at 80mph the bike is shaking, the engine is scraming at 5grand, it feels at any second as if it could pitch you into a tank slapper. At 80mph you feel like you are going for the land speed record. At 100mph you feel like you are cheating death. It is those feelings, that absolute raw edge that embodies the spirit a cafe racer, the soul a new bike is born without.
The difference between a cb750 and an r6 is the difference between a WWI spad, and an F16. Sure the F16 pilot can fly faster and harder, but only the Spad pilot is truely cheating death in his open cockpit rickety contraption.
The rider will make a difference to a certain point. I have a friend with a new R1. He doesn't know how to push the bike around curves and the chicken stripes on his tires are a mile wide. He gets pissed wheneve he hears my centerstand scraping behind him because he knows I am right on his ass in a curve. I have even managed to pass him on a curve a few times on my 75 Q-ship. However once we get a straight all he has to do is wick it up and he is gone and it takes me miles to catch him again. Unrestricted his bike will do 190mph, mine will do 110mph. If I am doing 2 miles a minute (say I got a good tailwind and am pushing 120mph) he is doing 3 miles a minute. in 2 minutes of running flat out he is 2 miles ahead of me. That is the magic of a new sport bike: Any Tom, Dick, and Harry can throw a leg over and go this speed, all you have to do is pony up the dosh for a power commander and tuck behind the fairing.
Edited by - Geeto67 on Apr 28 2006 1:27:20 PM
I have a 1986 ninja 1000R and at 100mph on the slab that bike is boring. It feels stable, sure, the wind isn't even that bad, it is just really boring. On the highway with the cb750 at 80mph the bike is shaking, the engine is scraming at 5grand, it feels at any second as if it could pitch you into a tank slapper. At 80mph you feel like you are going for the land speed record. At 100mph you feel like you are cheating death. It is those feelings, that absolute raw edge that embodies the spirit a cafe racer, the soul a new bike is born without.
The difference between a cb750 and an r6 is the difference between a WWI spad, and an F16. Sure the F16 pilot can fly faster and harder, but only the Spad pilot is truely cheating death in his open cockpit rickety contraption.
The rider will make a difference to a certain point. I have a friend with a new R1. He doesn't know how to push the bike around curves and the chicken stripes on his tires are a mile wide. He gets pissed wheneve he hears my centerstand scraping behind him because he knows I am right on his ass in a curve. I have even managed to pass him on a curve a few times on my 75 Q-ship. However once we get a straight all he has to do is wick it up and he is gone and it takes me miles to catch him again. Unrestricted his bike will do 190mph, mine will do 110mph. If I am doing 2 miles a minute (say I got a good tailwind and am pushing 120mph) he is doing 3 miles a minute. in 2 minutes of running flat out he is 2 miles ahead of me. That is the magic of a new sport bike: Any Tom, Dick, and Harry can throw a leg over and go this speed, all you have to do is pony up the dosh for a power commander and tuck behind the fairing.
Edited by - Geeto67 on Apr 28 2006 1:27:20 PM
What's a Q-ship? Your Cb will only do 110mph? Is it stock? I'm 6'2" and weigh 210, and tucked down as far as I can, I've had my '75 going 120mph. All it had at the time was aftermarket pipes and clubmans(and some lightening). It also has over 40,000 miles. I don't know, maybe my speedo's off. Jimmy
Oh yeah, I ride the Cb for the same reasons. Mine feels pretty stable at any speed going straight, but going 100mph on that thing around curves feels insane. I know I could spend a few grand (or even get financing) for a mid 90s rocket that would smoke the Cb in every way, except the feeling and the style. I don't want to be just another punk kid on a rocket.
By the way, I have a friend who owns a 73 Rd350, and just spent over $2000 on a 97 Yzf 750. He's gone 150mph on the Yzf, but he's already talking about selling it, because it's too boring and predictable! He said he loved how uncontrollable the Rd was. Before he bought the Yzf I went with him to look at an Rz350 that he almost bought, except it went for slightly more than he bought the Yzf for. I bet he would have liked the Rz better. Jimmy
By the way, I have a friend who owns a 73 Rd350, and just spent over $2000 on a 97 Yzf 750. He's gone 150mph on the Yzf, but he's already talking about selling it, because it's too boring and predictable! He said he loved how uncontrollable the Rd was. Before he bought the Yzf I went with him to look at an Rz350 that he almost bought, except it went for slightly more than he bought the Yzf for. I bet he would have liked the Rz better. Jimmy
i do love going fast on old bikes but i tell you i am ready for a newer commuter....you see i ride over 100 miles a day and pushing 95 miles an hour on a cb 350f is sweet and all but it is so damn cold these days and it takes me about half an hour before i can feel my extremities again.....other then that i hate new sport bikes, anyone want to buy me a KTM elephunt?
Ride Fast and Take Chances
Ride Fast and Take Chances
Best bet is probabaly one of these
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early 70's 2 stroke 750 cc Kawi H2 or a related yamaha TZ. They can get the hp your looking for to keep you in the game, but you would have to do some serious mods for handling. Here is a build page for one that now a flat tracker http://home.san.rr.com/h2hester
early 70's 2 stroke 750 cc Kawi H2 or a related yamaha TZ. They can get the hp your looking for to keep you in the game, but you would have to do some serious mods for handling. Here is a build page for one that now a flat tracker http://home.san.rr.com/h2hester
I think that if you want to be a little competetive with the newer sport bikes, the easiest way might be to move up a generation to the late 70s early 80s to start with. Look at the twin cam Hondas 750, 900, 1100 or the 2 valve Kawasakis or suzukis. They can still cafe out really well and will provide a little better handling and engine performance. I think if you tune for torque and handling you will be able to run with 90% of the punks on new sportikes. E-gay can be your friend on this one as far as better forks and swingarms and wheels and brakes. I am planning and collecting parts for my 82 Seca 550. I am gong to use this as a race bike, but it will probably be streetable too. Or by the time I collect up enough parts for the race bike I will have enough leftovers for a streetbike too.
Ken
AHRMA 412
Vintage racing - old guys on old bikes
Ken
AHRMA 412
Vintage racing - old guys on old bikes
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