Author Topic: My Own Mini SOHC Drag Race Adventure..... (Read 4825 times)

jaguar · « **on:** May 31, 2015, 08:21:23 AM »

Not to let the rest of the gang have all of the fun, I too recently found some old drag stuff.
No where near as much, or as cool. Bug figured some would find it interesting, and I have a few questions about it.

Started talked to an older guy a few weeks ago and he said that he had some old SOHC CB750 stuff from when he used to race.
Said he couldnt remember much about what was still left, but knew he had a special cylinder with RC cast into it, and webers.
That was all I needed to hear!

Grabbed the stuff yesterday.

RC Swing arm. Seems straight.

Head. Didnt look to hard at it. Seems to have HUGE ports and aftermarket retainers. Need to measure the valves to see what size. Needs a rebuild for sure.

Weber carbs on an RC manifold. Almost everything seems to move.

Old school air shifter. Dont really know if it works, how to test it, or how to use one.

RC Block.

Crank. Lightened rotor. Have not checked the journals.

Markings on the cam. Anyone know anything about these? I dont really know how to measure cams to get specs either.

This doesnt look stock

73mm Pistons. Do not look like they were run long.

Failed to get a picture of the near new GoldenRods!

Seems like this must have been on heck of a motor back in the day.
What kind of power/speed would this set up net?

754 · « **Reply #1 on:** May 31, 2015, 08:27:31 AM »

Don't worry, can sedthe goldenrods in the pic....nice score..

Stev-o · « **Reply #2 on:** May 31, 2015, 09:02:45 AM »

Nice find. Now you need to build a motor...

jaguar · « **Reply #3 on:** May 31, 2015, 09:04:36 AM »

Quote from: Stev-o on May 31, 2015, 09:02:45 AM

Nice find. Now you need to build a motor...

That I do.
I have most of the parts.

gschuld · « **Reply #4 on:** May 31, 2015, 09:17:22 AM »

Good for you jaguar. This new project should keep you way too busy to hold on to that Seeley frame. I'll come take it off your hands... LOL. Seriously, great score. Some nice vintage RC stuff you got there. 73mm RC Arias pistons and cast block. Webers, golden rods, RC swingarm. A solid start toward a proper vintage old school dragbike.

I'll send you an email later today. I may be able to help...

George

Jerry Rxman Griffin aka MuthaF'er · « **Reply #5 on:** May 31, 2015, 10:44:52 AM »

Bad ass score! Have you put it back together yet?

Cobra setup.

Bill/BentON Racing · « **Reply #6 on:** May 31, 2015, 11:10:10 AM »

William, nice, trade good ARD for cylinder! C'mon

Bill

gschuld · « **Reply #7 on:** May 31, 2015, 11:12:07 AM »

Probably bigger than this Norris cam:

125-NR .350 252 106 NORRIS R profile. MILD performance20/52 .005
.350 252 106 increase. Road/Road race. SOME TQ52/20 .005
ENGINE BUILDERS PREFER this profile
for small tracks in basically stock
motors. P.M. Springs STRONGLY
RECOMMENDED

jaguar · « **Reply #8 on:** May 31, 2015, 11:20:38 AM »

Quote from: Bill/BentON Racing on May 31, 2015, 11:10:10 AM

William, nice, trade good ARD for cylinder! C'mon Bill

I have had my eyes peeled for an ARD to use on the Seeley.
Figured these parts would peak your interest....lol

gschuld · « **Reply #9 on:** May 31, 2015, 11:50:17 AM »

Looks like Benton is trying to trade you the ARD he recently got from me. If that's the case, it is a nice one...

George

Medyo Bastos · « **Reply #10 on:** May 31, 2015, 12:29:22 PM »

Quote from: jaguar on May 31, 2015, 11:20:38 AM

Quote from: Bill/BentON Racing on May 31, 2015, 11:10:10 AM
William, nice, trade good ARD for cylinder! C'mon Bill

I have had my eyes peeled for an ARD to use on the Seeley.
Figured these parts would peak your interest....lol

think i have another ard tucked under the bed

Bill/BentON Racing · « **Reply #11 on:** May 31, 2015, 12:39:07 PM »

Yep, I need cylinder and a RC ignition distributor type! George, also got one from Trey, both good ones! Bill

dragracer · « **Reply #12 on:** May 31, 2015, 02:11:21 PM »

Gotta love this crowd- its like being on "Lets make a deal". Lol. Great score on the hipo parts. On the cam, figure out the base circle first, and then measure the lobe, both intake and exhaust. Subtract the difference and you have the lift. As to duration, no way to measure that without putting it in a motor and doing the math as far as I know.

754 · « **Reply #13 on:** May 31, 2015, 02:16:01 PM »

Was it a street or track bike?
Can you show a side shot of the lobes..

01Thomas · « **Reply #14 on:** May 31, 2015, 02:49:31 PM »

Besides all the other lovelies, that's a sandcast head!

jaguar · « **Reply #15 on:** May 31, 2015, 03:30:38 PM »

Quote from: Medyo Bastos on May 31, 2015, 12:29:22 PM

Quote from: jaguar on May 31, 2015, 11:20:38 AM
Quote from: Bill/BentON Racing on May 31, 2015, 11:10:10 AM
William, nice, trade good ARD for cylinder! C'mon Bill

I have had my eyes peeled for an ARD to use on the Seeley.
Figured these parts would peak your interest....lol

think i have another ard tucked under the bed

Oh yeah?

jaguar · « **Reply #16 on:** May 31, 2015, 03:31:03 PM »

Quote from: 754 on May 31, 2015, 02:16:01 PM

Was it a street or track bike?
Can you show a side shot of the lobes..

Was a strict race bike.

jaguar · « **Reply #17 on:** May 31, 2015, 03:31:19 PM »

Quote from: 01Thomas on May 31, 2015, 02:49:31 PM

Besides all the other lovelies, that's a sandcast head!

How do you tell?

Medyo Bastos · « **Reply #18 on:** May 31, 2015, 03:32:19 PM »

front center bolt is missing

jaguar · « **Reply #19 on:** May 31, 2015, 03:33:23 PM »

I only got the bottom half of the engine case.
Need to take a closer look at that, and maybe ask to see if the seller knows where the top is.....

SOHC4 Cafe Racer Fan · « **Reply #20 on:** May 31, 2015, 06:02:43 PM »

Nice score -- maybe this should go in the Seeley!

gschuld · « **Reply #21 on:** May 31, 2015, 06:08:06 PM »

Nah, thems drag racin' parts.....

George

Sent you an e-mail Jaguar

754 · « **Reply #22 on:** May 31, 2015, 06:13:54 PM »

The head was used to serial number 26***, if the lower case is sandcast, then you really need the top..

SBR-CB400F · « **Reply #23 on:** June 20, 2015, 07:25:52 AM »

very nice score. Its good to hear another drag bike build will be in the future

Adam

jaguar · « **Reply #24 on:** June 20, 2015, 07:57:57 AM »

Quote from: SBR-CB400F on June 20, 2015, 07:25:52 AM

very nice score. Its good to hear another drag bike build will be in the future

Adam

Still on the fence about what I will do.
Have talked to some people with drag frames. Would like to build a period drag bike and do some LSR.
But I know I have a few projects on the list in front of that.

SBR-CB400F · « **Reply #25 on:** June 20, 2015, 08:15:20 AM »

That sounds like a great plan.
Some of us can't be happy with just one project haha

Adam

Retro Rocket · « **Reply #26 on:** June 20, 2015, 05:38:34 PM »

Quote from: SBR-CB400F on June 20, 2015, 08:15:20 AM

Some of us can't be happy with just one project haha

Adam

You have no idea....

Stev-o · « **Reply #27 on:** June 23, 2015, 07:09:10 PM »

Quote from: Retro Rocket on June 20, 2015, 05:38:34 PM

Quote from: SBR-CB400F on June 20, 2015, 08:15:20 AM

Some of us can't be happy with just one project haha

Adam

You have no idea....

Oh yes I do

Medyo Bastos · « **Reply #28 on:** June 23, 2015, 08:57:31 PM »

i about ended up with the california drag queen this past weekend. my wife stopped me and reminded me about how many unfinished projects i have, lol

...Save a tree, eat a beaver...

dragracer · « **Reply #29 on:** June 25, 2015, 12:42:04 AM »

Quote from: Medyo Bastos on June 23, 2015, 08:57:31 PM

i about ended up with the california drag queen this past weekend. my wife stopped me and reminded me about how many unfinished projects i have, lol

...Save a tree, eat a beaver...

That bike was sitting there crying for you to take it home. I could see that look of lust in your eyes when Bill showed it to us. Lol.

Bill/BentON Racing · « **Reply #30 on:** June 25, 2015, 02:02:18 AM »

Yep, could still be yours....or someone!!!!

Bill

Medyo Bastos · « **Reply #31 on:** June 25, 2015, 04:06:06 AM »

i have had my eye in it since he first brought it home!

...Save a tree, eat a beaver...

jaguar · « **Reply #32 on:** June 25, 2015, 05:16:16 AM »

Lots of coveting going on....lol

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Author Topic: My Own Mini SOHC Drag Race Adventure..... (Read 4825 times)