I've had dirt bikes and have rode others, but my very first street bike back in 1990 (I'm aware most here weren't born yet) was a 1982 Honda CM450E

Over the last few years I've realized that a modded CBR1000RR in a city (500k+ population) with city streets ranging from 25mph - 45mph (most 30-40) riding around on a bike that can do entire city (including highway 65mph limit) in first great without breaking a sweat is a bit of overkill. I have since been looking for something more suited for the streets, either a 600 (any make just something for sensibility/can have a passenger) or doing a cafe racer. But what? Well, go back to roots.

I've searched high and low to find my first bike (just year and make, not actually hunting down MY FIRST BIKE)

Last week it fell in my hand by no other means but "hey, what's in the background of that picture of your bike?"

Fast forward a couple days and I'm Google-n pictures of it "cafe-d out" and I come across a picture with what appeared to be sitting on either a cbr600 or cbr1000 suspension. Full. Forks, rims, swing arm, breaks... full load.

I'm waiting on my Carrozzeria rims to come in for my RR7 so I'll have a set of stocks laying around. I can fab a rear with no problem, but I'm concerned with the trouble of how the triple would fit the front.

If it will be easy, I'll either hunt down in pieces the suspension parts, or hunt down 600/1000 wrecked or blown motor for donor posts.

Any thoughts?

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Not easy. But, doable as you can see.

Check out cognito moto- I have their upper triple with risers on 600rr forks on my cm450. Depending on what forks you go with, you may also need bearings, which can be found through all balls racing.

They have some pretty good options out there. You can build one, but may need to have machine shop do fabrication on certain parts. It is duo able.

Well I ended up finding a site, you input year, make, model of bike and it spits out a list of just about every bike ever made and gives the part number for upper and lower head bearings for the front you are planning to use. Ordered them. Also ordered stock race assembly for the 450. Bike frame and front end at a machine shop that does custom work for motorcycles. When parts come in, either of the bearings should work, last resort the stem will be pressed out of 450 triple and fitted into the cbr929 front end. I got the apex 6 wheels in and are at a shop to get powder coated. The stock front wheel fits the 929 perfectly.

Next hurdle is the rear. I have a complete 07 cbr1000rr swing arm coming from same place I got front (sitting on porch waiting for big brown truck) that has master and caliper, rim with no tire, shock and links. What I need is mounting measurement. The center stand on 450 is going to come off and it looks like a great place to bolt the lower links, I just don't know from there where the swing arm bolts to the frame (measurement above and forward) so I can have shop make plates to weld onto 450 frame.

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That is cool you found a site to purchase the parts from and list. Do you have the link? Next, you can do a mock up to give you an ideal of where to mount the swing arm. A good machine shop will be able to point you in the right direction.

https://www.allballsracing.com/forkconversion

Blessings