Grandpa's CB750F rides again!

[ws6transam]

Hi all,
Mike, this is a pretty darned good bike, this old CB750F Supersport. I've been riding it every day, and saving up to 20 cents PER MILE on just fuel savings alone. Thus, for my eight mile round-trip ride to work, I save between $1.25 to $1.70 in gas, at $3.50 a gallon. Thus, the bike pays for it's insurance and registration, plus a little extra if all I do is ride it to work and back. This thing gets 48 miles per gallon, just around putting around town.

However, it's still got some balls. It just takes a whole lot of wrist to crank the throttle wide-open: It takes effort and a concious decision. However when you do and let the 750 wind out beyond 6000 RPM, it wails and rockets you forward like an old musclecar. I can fully believe that this is a low-13, high-12 second machine in the quarter mile.

It'll take between 5300 and 8500 miles to pay for the machine, it's repairs, and it's insurance and registration. After that, it's a money generator at these current fuel prices.

...plus my kids think it's ultra-cool and there's no way to put a price on THAT. :D

[IROCFST]

Dan, Dan you da man!!!:jiggy: So when you going to make a chopper out of it and put some pointy highway bars/pegs on it? lol I'll have to dig up some pics of my brothers old 79 Honda CBX.Nothing like a inline 6 cyl. between your legs!

[Timberwolf]

Glad you're having fun with it dan :) I have seen kits to make the throttle a different ratio... like 1/2 the turn, etc. not sure if they make them for the cb, but that bike was so popular in it's day I wouldn't be surprised.

[Razmiblackz28]

Glad you're having fun with it dan :) I have seen kits to make the throttle a different ratio... like 1/2 the turn, etc. not sure if they make them for the cb, but that bike was so popular in it's day I wouldn't be surprised.

1/4 turn throttles rock:headbang:

[krtismo]

Dan, I think its time you buy that bike you've been wanting so you can sell me the CB750F!:heyhey:

Please!

[ws6transam]

Dan, I think its time you buy that bike you've been wanting so you can sell me the CB750F!:heyhey:

Please!

Yeeaaahhhh, THAT would be nice! I'm only about $2500 away from doing that.
-----

TODAY I managed to swap out the nasty old rear tire for a nice, fresh tire. I whipped out my old tire changing irons and did it myself because I am a chronic doit-yourselfer. The motorcycle shop wanted FOURTY bucks to swap the rubber off the old rim, plus take the new rubber off IT's respective old rim, and put the new rubber onto the CB750 wheel. Argh. Fourty bucks. I suffered a bit of cheapbastarditis at hearing that, so I sweated and swore and did it myself. Removal of the tires was the hardest part. I'm a bit glad I did it though, because there was some corrosion inside the wheel in need of wire wheeling. That old tire had a tube inside (with water in there), and the whole thing was soggy and stinky. I'm surprised that the tire didn't BLOW UP on me! :eek: It was probably the tube (in a tubeless wheel) that saved me. I'm thinking that now the wheel weighs two or three pounds less, that it might actually improve performance.

Bearings look okay though. The chain needs replacement, but the sprockets look okay. I'll have to order up a new DID O-ring chain some time this summer. That ought to take care of the rear of the bike!

[Dave89IROC]

Dan, did you get the new tire balanced?

[ws6transam]

Not yet. I'll balance if it becomes a problem. However it doesn't wobble much on the center stand so it might be alright. It feels good at 40 MPH, anyways. A lot better than the old tire.

[ws6transam]

A little update for you:

The CB750F runs great now. I washed it for the first time, and it looks really classic!

Carbs are smooth, it starts up instantly, and after a minute of choke, it'll idle at 850 RPM. I've replaced the rear tire, replaced the warped front rotor, and replaced the frozen caliper with the busted-off bleeder screw. The brakes are still feeble on the front, but with thirty year old lines and a questionable master cylinder, who can blame them?? ;)

The bike's getting between 40 and 45 MPG around town, and I'm driving it every day for work and errands. It'll be clicking over 20,000 miles on the odometer by the week's end: I've put about 400 miles on it in the last three weeks or so.

I'm getting ready to shop for some more parts, actually. The tank needs some new rubber hold-down straps, I need a new rubber foot peg, and I need to recover the seat. All this riding has made the old vinyl split in multiple places. So, I'll probablyplace an order for the seat cover, tank straps, foot peg rubber, and a master cylinder rebuild kit. I'll probably rip out the brake lines and take them to a hydraulic repair shop & have them fabricate some new ones in braided stainless steel while we're at it.

After that, I think I'll be in good enough shape to ride this bike to Cadillac for a weekend: I need to help my brother in-law with some electrical work on his house.

--Cheers,

[kammi10]

sweet dan, im going up either friday or monday to put money down on my new bike

[ws6transam]

http://www.sohc4.us/gallery/d/34043-2/CB750F2.jpg

Here's how it looks today. It just did a nice, smoky burnout in the driveway. I almost was half-tempted to do that circle/slash thingy that they did in the Mad Max movie.... Maybe I'll save it for the next spring duft-off or something...

[Becca_007]

So when you coming down for a cruise?

[ws6transam]

When I'm not home alone with three kids. Then when Laura is home, lately there has been spring "stuff", like doing things with her. Unfortunately my interests generally fall into second place, and I fit them in whenever I can. My "big car event" for the year was to be the National Motorsports Event (formerly NFME) but it got canceled so now I'm out.

Plus it's hard doing the parenting where you have to teach your kids how to do chores. It's almost easier if I just do the damn chores myself. They deserve a good boot to the backside, sometimes.

Now, back to laundry.

[AL SS590 M6]

Wonder if someone still makes the replacement double saddle seats for those. That's the single best improvement that you can make to the ride quality on an old bike and the back saddle really helps keep the kids in place when they go along. Had one on my CB 750 and the KZ 900.

Do you need a set of carb sticks for sycronizing the carbs? I got some.

[rod442]

Do you need a set of carb sticks for sycronizing the carbs? I got some.

before you send em off to dan, I might need to use them to synch the TB's on my bike. I think I read somewhere that it still needs to be done, even tho its FI.

[AL SS590 M6]

before you send em off to dan, I might need to use them to synch the TB's on my bike. I think I read somewhere that it still needs to be done, even tho its FI.

syncronization with carb sticks assures that each throttle slide is open the same amount. Doesn't matter the type of fuel delivery.

[rod442]

then its something that definately needs to be done when the slide stops I have are put in, I would guess.

[ws6transam]

I've been thinking of making my own carb balancers from a set of four old MAP sensors. Think it's possible? I'd just need to buy a set of analog readouts, zero to five volt. I could probably make do with one readout and a rotary switch, too.