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Old Streetfighter Motorcycle Forum Post 04-20-2015, 11:02 PM   #11
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Default Re: cb750 with a cbr600rr motor

Congrats on the little one!

These bikes just had long legs in stock form. Then dropping from a 19" tire to a 17" with a low sidewall aspect ratio makes it even worse. But it sounds like you know what you're doing. Pulling the rake in is a great idea. The head angles on these old standards was pretty lazy.

F2 & F3 forks work really well on these bikes as far as height and tree offset with all other things being stock, but I'm sure you're not interested in running 20 year old conventional forks

DW!
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Old Streetfighter Motorcycle Forum Post 04-21-2015, 01:23 AM   #12
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Default Re: cb750 with a cbr600rr motor


cbr6rr engine looked small on cb frame
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Old Streetfighter Motorcycle Forum Post 04-21-2015, 01:53 AM   #13
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Default Re: cb750 with a cbr600rr motor

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cbr6rr engine looked small on cb frame
Nice pic for reference. Makes you wonder about air cleaner possibilities.
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Old Streetfighter Motorcycle Forum Post 04-21-2015, 12:07 PM   #14
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Default Re: cb750 with a cbr600rr motor

Yeah I'm pretty set on the 600rr motor just because its about the hp im looking for, id like to keep in in the honda family, id like to keep to in the 03-14 years/technology range and they typically go on ebay for a price i like. I'm actually trying to find the dimensions on the motor height etc so i can determine just how difficult it will be to fit up a custom air box or pods with an elbow fitting... I'm open to other motors but i want to see if i can do the 600rr first then work from there. I'm wanting to alter the backbone on the frame to cradle the motor and give me some more room up top similar to the modern sport bike frames and that means ill have to alter the tank again but oh well. If anyone has access to an 03-12 motor and wants to shoot me some general measurements i would appreciate it... otherwise ill probably be creeping around dealerships looking for a used bike to measure on before i decide for certain.
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Old Streetfighter Motorcycle Forum Post 04-21-2015, 12:15 PM   #15
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Default Re: cb750 with a cbr600rr motor

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Originally Posted by Hillsy View Post
You can get a stepped top clamp to slide the forks down a bit (well, I know they make them for Busa fronts to fit to GSX14's).

Biggest problem you're going to find with putting a modern motor in that chassis is the intakes point to the sky and you've got a backbone frame in the way. Maybe a Z1000 motor or ZRX would be a better choice as the intake tracts are closer to horizontal.
Good idea, cognito moto make a conversion stem for the R1 to cb750 and I'm hoping it will fit so i dont have to have a custom triple machined, but if i can do a stepped top clamp made for the R1 then i will definitely go that route...or I'll just pay a zillion times as much and have one made...still searching for a good machine shop with a good rep here in San Antonio since ill inevitably need one.
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Old Streetfighter Motorcycle Forum Post 04-21-2015, 05:07 PM   #16
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Default Re: cb750 with a cbr600rr motor

I like it, thinking outside the box is always good

I think the intake & tank fitment are going to be your main issues with fitting the motor & there maybe a problem squeezing the rad in if you shorten the rake too much, its probably going to be tight anyway at a guess

I look forward to seeing where you got with this
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Old Streetfighter Motorcycle Forum Post 04-22-2015, 01:20 PM   #17
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Default Re: cb750 with a cbr600rr motor

Okay so i found some good CAD models and an amazing resource. http://www.wwufsae.com/Shared_FSAE_CAD_Library/

Its a collection of fsae cad models and the motor selection is vast and is broken down to air filter model and all individual parts etc... great public resource for anyone building motors. I'm going to compare some measurements after work and get a general idea of how to proceed.
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Old Streetfighter Motorcycle Forum Post 04-23-2015, 12:57 AM   #18
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Default Re: cb750 with a cbr600rr motor

Okay i think i can squeeze the 600 motor in there, its gonna take some trickery but i'm not in an hurry and i got time to screw up and re-do (only a couple times hopefully). I'm going to throw together a rendering and ill put it up when i get somewhere. There might not be too much "cb" left on the bike when i get finished but that doesn't matter to me much.
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Old Streetfighter Motorcycle Forum Post 04-23-2015, 12:21 PM   #19
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Default Re: cb750 with a cbr600rr motor

When pulling in the rake be careful not to kill the space under the neck.
You have to fit a radiator now!

I've contemplated doing this often but i end up building a new frame practically.

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Old Streetfighter Motorcycle Forum Post 04-27-2015, 11:05 PM   #20
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Default Re: cb750 with a cbr600rr motor

A drawing i threw together but its just a starting point. I'm going to practice a little pipe bending and notching for now and keep mulling it over. I'm going to try and work out a frame to where i can keep more of the original cb750 but still cradle the motor as a stressed member...and without adding 40lbs of metal... if anyone has frame references or pics i would love to see some good ideas. I know people have done builds similar but i seem to be having a hard time finding much variety or detail on said limited variety of pics/builds. The "cafe" style one is just an idea from when i was still planning to leave the rebuilt 750 in it.
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