Author Topic: My 76 CB750 Project "Crotch Bobber" (Read 23940 times)

cbr500 · « **Reply #50 on:** August 31, 2010, 08:32:09 AM »

And some more.

zzpete · « **Reply #51 on:** August 31, 2010, 10:54:09 AM »

Clear the runway, the "Crotch Bobber" is almost ready for takeoff!!! Lookin GREAT!!!

RustyOlive · « **Reply #52 on:** August 31, 2010, 11:17:17 AM »

WOW!!! Amazing!! thats a keeper right there!!

cbr500 · « **Reply #53 on:** September 03, 2010, 10:43:41 AM »

Well I had the bike on the dyno last night. There is still some tuning to be done as it is still a little lean. The first run I had 51hp at the wheel. That was running about 14:1. A quick jet change up one size and th second run it pulled 57hp. It is still a little lean above 5500rpm about 13.5:1. I am going to jet down one more size. There is a pretty bad lean spike right around 4000rpm. It did get better with the last jet change but it was off the charts on the dyno graph. I am going to mess around with it some more then take it back. I feel like it should be able to easily get over 60hp by the time I'm done tuning.

HedNut · « **Reply #54 on:** September 08, 2010, 04:40:10 AM »

Sweet man! Nice to have access to a dyno! That's too cool! Cheers! Love your bike.... Great info!!

sinister902 · « **Reply #55 on:** September 08, 2010, 11:44:07 AM »

Awesome build!!

cbr500 · « **Reply #56 on:** September 27, 2010, 12:14:52 PM »

Well I finally got my sewing machine running like it should be. I made the seat cover for the bike. It came out pretty good but I am going to make another seat pan with some stiffer foam. The stuff I had ordered was a bit spongier that I wanted. When I stretched the vinyl it changed the shape of the sest hump more than I wanted. That said for now I am done with the bike and am just going to ride and enjoy it with the little time of nice weather thats left. I am hoping for some nice weather this weekend to get some nice pics outdoors.

RustyOlive · « **Reply #57 on:** September 27, 2010, 12:54:18 PM »

Looks great man!!!
I'd like to know how she rides.. I'm planning on going down the same road with my bike this winter. gsxforks, 17x5.5 rear wheel.. love to year how yours does, and any advice/do's or don'ts...

theofam · « **Reply #58 on:** September 27, 2010, 01:05:40 PM »

I just read this thread, and the Crotch Bobber looks amazing. What's the deal with the oil tank's clear line feeding back into itself? Curious.

j squared · « **Reply #59 on:** September 27, 2010, 01:09:06 PM »

Quote from: theofam on September 27, 2010, 01:05:40 PM

I just read this thread, and the Crotch Bobber looks amazing. What's the deal with the oil tank's clear line feeding back into itself? Curious.

Looks like an oil level indicator. Oil in the tube rises as the level in the tank rises.

rickmoore24 · « **Reply #60 on:** September 27, 2010, 01:16:07 PM »

That sir is a RAD bike, great job!

theofam · « **Reply #61 on:** September 27, 2010, 04:17:40 PM »

Ahh, thx jsquared.

brandEn · « **Reply #62 on:** September 27, 2010, 06:22:50 PM »

I love your color combo. Bike looks great!

HedNut · « **Reply #63 on:** September 28, 2010, 04:17:16 AM »

Stand UP JOB DUDE!! Bike is killer...excellent colors and custom all around.
SLIK RIDE!!

cbr500 · « **Reply #64 on:** September 28, 2010, 06:44:56 AM »

Thanks for the compliments. I love the bike as well. I am surprised it came out as well as it did. The bike rides very well. It tracks straight down the road doesnt get squirrly in the corners. I did mess up and buy Heavy Duty shocks for it. So it is a little rough on bumpy roads. I plan on gettign a set of custom shocks and springs for it over the winter. I also plan on putting a steering stabilizer on it. The one from the CBR I got the front end from would not have beeen easy to use or look very good on the bike.

As far as Do's and Don'ts, I dont think I have much advise except take your time and think the thing through and you should not have much trouble.

cbr500 · « **Reply #65 on:** October 07, 2010, 10:42:59 AM »

Well I finally had a chance to take a few nice pics of the bike completed (for now).

78CB750CAFE · « **Reply #66 on:** October 07, 2010, 11:45:28 AM »

NICE

zzpete · « **Reply #67 on:** October 07, 2010, 11:47:12 AM »

Looks FANTASTIC!!! I just nominated the "Crotch Bobber" for BOTM!!!!
Vote early and often!!!

The Link: http://forums.sohc4.net/index.php?topic=77774.0

The_Crippler · « **Reply #68 on:** October 07, 2010, 12:53:50 PM »

...and beat me to it by a half step.

RustyOlive · « **Reply #69 on:** October 07, 2010, 03:39:12 PM »

dam... this bike just gets better and better.. lol nice ride man

HedNut · « **Reply #70 on:** October 07, 2010, 04:34:24 PM »

Awesome ride man! I third the nomination! Well deserved!!!

vanillagorilla · « **Reply #71 on:** October 07, 2010, 05:19:38 PM »

Just read this whole thread... Very cool build. Good to know about the front end. I think youll be seeing more of those on CB's now that we know its an easy swap! Great job, CBR500!

jaguar · « **Reply #72 on:** October 08, 2010, 10:30:56 AM »

great build

did you make that oil tank?
any pics of mounting it?

greasy j · « **Reply #73 on:** November 14, 2010, 11:21:18 AM »

killer! that seat rules! nice work, I love it!

what did you use for your seat pan? does it open like the stock one?

I want a similar seat for my bike, I was thinking of getting the cutlass seat pan from airtech and cutting it down a bit, but it's kinda spendy...

the oil tank is pretty sweet also, I'd like to do something like that on mine also, ditch the covers. I like the oil tank like yours, not into the donut look some guys go for, hiding it, with a hole right in the middle of the bike. on the other hand I kinda dig my maier covers with 750 pinstriping. I've gone back and forth on that issue, we'll see what happens.

cbr500 · « **Reply #74 on:** November 17, 2010, 10:08:07 AM »

I did not make the oil tank. I bought it off Ebay cant remember the seller. The only thing I did to it was drill out the 1/8" NPT fittings and weld in larger -AN fittings for more oil flow to the motor. The mount for the tank was just a piece or 1" square tubing I notched to fit between the frame rails under the seat.

The Seat pan is made from a piece of 16 or 18ga. sheet aluminum. I mad it follow th elines and put some bends on it to make it a little more rigid. it is attached using som 3M trim lock (its like a heavy duty velcro).

Thanks for the compliments!

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Author Topic: My 76 CB750 Project "Crotch Bobber" (Read 23940 times)