Topic: 73 CB350F/2008 600RR Mash Up Cafe Project

[Sheik Yerbouti]

Beautiful welds!

[Ringo]

Too cool.  I'm loving the thought of having a modern 600 in a vintage bike.  Keep it up!

[Syscrush]

I still have 6' of moly tubing and I'm not real concerned about adding a few pounds

Speaking of adding pounds... Which is lighter - the 350 engine or the 600?  Dry, I would expect the 350 to be lighter, but with the rad full of coolant, it might come out closer.

[climbingaz]

Wow, hats off on the work so far!

[babyfood1217]

Drool.  Beuatiful.  Look, you got me so excited about this, I can't even type correctly...

[ivanhoew]

most interesting .

[Retro Rocket]

Interesting

[alternativeauto]

I still have 6' of moly tubing and I'm not real concerned about adding a few pounds

Speaking of adding pounds... Which is lighter - the 350 engine or the 600?  Dry, I would expect the 350 to be lighter, but with the rad full of coolant, it might come out closer.

I haven't weighed either, but I did ship the 350F engine, so I am going to look back at the weight of the 3 boxes and compare to the weight of the 600. My guess is the 600 is a little heavier dry, guessing maybe by 15#.

[Syscrush]

I haven't weighed either, but I did ship the 350F engine, so I am going to look back at the weight of the 3 boxes and compare to the weight of the 600. My guess is the 600 is a little heavier dry, guessing maybe by 15#.

I meant to say that I expected the 600 to be a bit lighter dry, but that with the rad and coolant factored in, it would probably be closer.

Either way, I'm interested in those #'s and will be keeping a keen eye on your project.

[Syscrush]

BTW - years ago I saw an article online about a guy who had stuffed a CBR600 engine into a CB550 chassis.  His front end conversion used KTM USD forks with a supermoto front wheel.  The forks looked horrible (way up in the triples and with almost all of the travel taken out to shorten them) but it was still kind of cool.

[climbingaz]

Do you figure you'll have to heavily modify the gas tank because of the new backbone on the frame?  Loose any substantial fuel capacity?

[FunJimmy]

Great concept build.
can't wait to see how it all comes together.

Cheers
FJ

[alternativeauto]

Do you figure you'll have to heavily modify the gas tank because of the new backbone on the frame?  Loose any substantial fuel capacity?

The fuel tank is now hollow and basically an open air box. Fuel capacity ZERO. New fuel tank will be in tail section, Fuel capacity, hopefully 1.5 Gal.

[climbingaz]

Do you figure you'll have to heavily modify the gas tank because of the new backbone on the frame?  Loose any substantial fuel capacity?

Cool!  Was sort of hoping you were going to keep a stock "looking" tank to keep the theme together.  But let's see....1.5 gallons???  What, maybe a ride range of about 60 miles?

The fuel tank is now hollow and basically an open air box. Fuel capacity ZERO. New fuel tank will be in tail section, Fuel capacity, hopefully 1.5 Gal.

[Syscrush]

I hate to harp on this kind of thing, but are you gonna brace that CRF450 swinger?  It's designed for a bike with 1/2 the power and 2/3 the weight.  Although given that that bike can also get 30' of air, land at 50mph and take off WFO, it's probably fine.

[alternativeauto]

I hate to harp on this kind of thing, but are you gonna brace that CRF450 swinger?  It's designed for a bike with 1/2 the power and 2/3 the weight.  Although given that that bike can also get 30' of air, land at 50mph and take off WFO, it's probably fine.

I really think the wheel spokes will twist before that big hunk of box tube aluminum. Oh yah, the spokes lol. No mention from anyone about those yet. Haha

[luceja]

Do you figure you'll have to heavily modify the gas tank because of the new backbone on the frame?  Loose any substantial fuel capacity?

The fuel tank is now hollow and basically an open air box. Fuel capacity ZERO. New fuel tank will be in tail section, Fuel capacity, hopefully 1.5 Gal.

I've had a few fantasies of projects involving a tank in the triangle area, but the challenge was the gravity feed to the carbs. Seeing as how that newfangled 600 motor you have probably has a fuel pump, I guess that'd be an option for you. By the way, super cool project. I look forward to seeing it move along.

[Syscrush]

I really think the wheel spokes will twist before that big hunk of box tube aluminum. Oh yah, the spokes lol. No mention from anyone about those yet. Haha

Well, I was thinking it - specifically I was thinking about the hubs having probs dealing with 120hp and a bike that's probably 50 lbs heavier than the donor bike.

But again, there's the fact that sumo wheels/spokes/hubs are subjected to jumping stresses.

[Jan187]

I dont see any problem using those hubs, the sumo engines dont produce as much horses but they have torque!!! a good one even pulls liter bikes off the line.
the only concern i would have is the power in that frame and swingarm.
How is your chain clearance on the wheel and frame?

[alternativeauto]

I dont see any problem using those hubs, the sumo engines dont produce as much horses but they have torque!!! a good one even pulls liter bikes off the line.
the only concern i would have is the power in that frame and swingarm.
How is your chain clearance on the wheel and frame?

The frame clearance and chain alignment is the biggest challenge and will be the hardest part of the build. Once I have that in check, the rest should fall together nicely. I will be visiting my chassis guy this week to discuss my options. I might end up flipping the rear wheel and using a jack shaft to keep my geometry the way I want it.

[Syscrush]

The frame clearance and chain alignment is the biggest challenge and will be the hardest part of the build. Once I have that in check, the rest should fall together nicely. I will be visiting my chassis guy this week to discuss my options. I might end up flipping the rear wheel and using a jack shaft to keep my geometry the way I want it.

Keep in mind that going to a jackshaft will probably mean losing the bike's anti-squat mechanism - and you probably want that intact with 115hp.

[brandEn]

I can't wait to see how this turns out. Those wheels will look killer.

[65Ch3v3LL3]

Any updates on the build? You are using the same front end that I plan on using on my 79 650 and would like to see how you setup those wheels. I sure would be nice if you could do dual disks. Looks great so far.

[hapakev]

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[lordmember1969]

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