Author Topic: 1/4 times for stock 78 cb750k? (Read 3223 times)

Phxmark123 · « **on:** June 20, 2008, 05:22:49 PM »

I am just curious what the factory 1/4 mile times were for the 78 cb750k. Anybody know?

WFO · « **Reply #1 on:** June 20, 2008, 05:34:49 PM »

Pretty close i will keep looking but this was a pretty cool read..

http://www.triumf.ca/people/baartman/bike/cb750-77.html

Phxmark123 · « **Reply #2 on:** June 20, 2008, 05:39:27 PM »

I saw this article. They list the F model times but not the K. I'll let you know if I find it also. Did a google and didn't have any luck.

eurban · « **Reply #3 on:** June 20, 2008, 06:31:44 PM »

No, read the article more carefully . . . Lists the 77Ks 1/4 at 13.33 . . . .

754 · « **Reply #4 on:** June 20, 2008, 08:37:02 PM »

Now that sounds like it could be done..

Phxmark123 · « **Reply #5 on:** June 21, 2008, 12:49:14 AM »

My bad...now if I could find out how much difference the '78's are.

eurban · « **Reply #6 on:** June 21, 2008, 05:39:00 AM »

None

Phxmark123 · « **Reply #7 on:** June 21, 2008, 05:45:31 AM »

Kool, thanks

Sam Green Racing · « **Reply #8 on:** June 23, 2008, 05:36:12 PM »

Quote from: Phxmark123 on June 21, 2008, 05:45:31 AM

Kool, thanks

Do you have a 78 CB750k ?

Sam.

TwoTired · « **Reply #9 on:** June 23, 2008, 06:26:31 PM »

According to the Honda Shop manual, the K7 has a primary ratio of 1.708, the K8 has a primary ratio of 1.989.
The change ought to make the 78 faster in pickup than the 77, though I have no quantification of that.

Cheers,

Phxmark123 · « **Reply #10 on:** June 24, 2008, 01:17:08 PM »

SAMC750: Yes I do have 78 750K, cant you tell from my icon picture...lol. Customized

Sam Green Racing · « **Reply #11 on:** June 24, 2008, 03:50:35 PM »

Quote from: Phxmark123 on June 24, 2008, 01:17:08 PM

SAMC750: Yes I do have 78 750K, cant you tell from my icon picture...lol. Customized

That's what I figured, SO..........why don't you take it to a drag strip and find out for youself

you know you want to

Sam.

medic09 · « **Reply #12 on:** June 24, 2008, 03:57:42 PM »

An answer worthy of you, Sam!

Sam Green Racing · « **Reply #13 on:** June 24, 2008, 04:35:25 PM »

Life's a DRAG doc, can you give me somthing for it

Sam.

Phxmark123 · « **Reply #14 on:** June 25, 2008, 07:17:38 AM »

Hey Sam, your links in your signature dont work. I have to learn to ride again before I can fly, been about 15 years

ekim98 · « **Reply #15 on:** June 25, 2008, 11:27:47 AM »

About 5 weeks ago I took my 78 750k to the Bowling Green, Ky drag strip. Made 6 passes. First was not to good - 14.3 at 93 mph, last was 13.4 at 98.8 mph. The bike had more but I didn't push as hard as I could have, plus my reaction time was horrible. My bikes not stock, 4 into1, pods, small 1/4 fairing and approx 60 lbs lighter than stck, so it should really do better.

Leino · « **Reply #16 on:** June 25, 2008, 11:51:04 AM »

Quote from: ekim98 on June 25, 2008, 11:27:47 AM

About 5 weeks ago I took my 78 750k to the Bowling Green, Ky drag strip. Made 6 passes. First was not to good - 14.3 at 93 mph, last was 13.4 at 98.8 mph. The bike had more but I didn't push as hard as I could have, plus my reaction time was horrible. My bikes not stock, 4 into1, pods, small 1/4 fairing and approx 60 lbs lighter than stck, so it should really do better.

Reaction time doesn't affect your ET.

tinyrobot · « **Reply #17 on:** June 25, 2008, 11:57:00 AM »

Quote from: ekim98 on June 25, 2008, 11:27:47 AM

My bikes not stock, 4 into1, pods, small 1/4 fairing and approx 60 lbs lighter than stck, so it should really do better.

what parts are you figuring in to lose 60lbs?

ekim98 · « **Reply #18 on:** June 25, 2008, 02:47:26 PM »

Quote from: tinyrobot on June 25, 2008, 11:57:00 AM

Quote from: ekim98 on June 25, 2008, 11:27:47 AM
My bikes not stock, 4 into1, pods, small 1/4 fairing and approx 60 lbs lighter than stck, so it should really do better.

what parts are you figuring in to lose 60lbs?

Removed tach, center stand, chopped both fenders, stock air box, center light cluster, stock foot pegs replaced with cbr 1000rr rear sets, stock seat cut down = 5 lbs lighter, 4 into 1 exhaust, drilled front brake rotor, all emison stuff, misc. brackets, very small turn signals and tail light, changed head light brackets, replaced brake arm stay will alium. piece. My final weight lose was based on stock dry weight of 508 lbs. and then weighted on a certified scale showing 464 lbs.? minus 2-1/2 gals. of gas - 15 lbs and 3.7 quarts of oil at 5.3 lbs. comes out to 443 lbs. Each item I replaced was weighted with a digtal scale to determind weight savings and the final weighting confirmed it. The actual numbers might be off a little based on weight gas and oil as I didn't write all the numbers down but they are quite close. To lose much more weight would start to cost more in replacement items(read custom items) that I can't really afford/justify. Another 7 to 10 lbs. could be gained if I remove the electric starter and lightened the stator some.

754 · « **Reply #19 on:** June 26, 2008, 05:30:40 AM »

That is a realistic time.

Regardless of what they did in a magazine test, that is what most riders will get out of it.

eldar · « **Reply #20 on:** June 26, 2008, 06:57:09 AM »

Seems true for all bike though. The average person will most likely never get the same as a magazine.

eurban · « **Reply #21 on:** June 26, 2008, 08:00:44 AM »

Yeah, I wasn't going to get into it, but somehow sandcasts breaking into the 12's by your average joe is realistic too

. . . . . .

ekim98 · « **Reply #22 on:** June 26, 2008, 08:13:52 AM »

I don't have a tach on my bike so it's hard to really judge how much I'm reving on take off. It would probably help if I had a tach in that respect, I just don't know how much. Each pass I made was quicker than the one before. But getting to the same times as a professional is not really feasible <sp? for me I don't think, but I did want to get to 100 mph. Oh well!

Sam Green Racing · « **Reply #23 on:** June 26, 2008, 03:20:48 PM »

Quote from: ekim98 on June 25, 2008, 11:27:47 AM

About 5 weeks ago I took my 78 750k to the Bowling Green, Ky drag strip. Made 6 passes. First was not to good - 14.3 at 93 mph, last was 13.4 at 98.8 mph. The bike had more but I didn't push as hard as I could have, plus my reaction time was horrible. My bikes not stock, 4 into1, pods, small 1/4 fairing and approx 60 lbs lighter than stck, so it should really do better.

Those are not bad times at all for a first time out ekim. That 13.4 was as quick as Chris's best run with the old 736 motor

Like Juha (leino) said, the reaction time don't make any difference to the ET.

Keep at it and your times will improve, practice makes perfect.

Sam.

ekim98 · « **Reply #24 on:** June 26, 2008, 06:55:28 PM »

Quote from: SamCR750 on June 26, 2008, 03:20:48 PM

Quote from: ekim98 on June 25, 2008, 11:27:47 AM
About 5 weeks ago I took my 78 750k to the Bowling Green, Ky drag strip. Made 6 passes. First was not to good - 14.3 at 93 mph, last was 13.4 at 98.8 mph. The bike had more but I didn't push as hard as I could have, plus my reaction time was horrible. My bikes not stock, 4 into1, pods, small 1/4 fairing and approx 60 lbs lighter than stck, so it should really do better.

Those are not bad times at all for a first time out ekim. That 13.4 was as quick as Chris's best run with the old 736 motor

Like Juha (leino) said, the reaction time don't make any difference to the ET.

Keep at it and your times will improve, practice makes perfect.

Sam.

I realize reaction time doesn't effect ET but they do list it on your time sheet, and it looks bad when your still on the line and the other guy is 30 feet down the track already!!

News:

Author Topic: 1/4 times for stock 78 cb750k? (Read 3223 times)

Phxmark123

Phxmark123

Phxmark123

Phxmark123

Phxmark123

Phxmark123

eldar