Author Topic: Dry clutch on CB750  (Read 131757 times)

0 Members and 2 Guests are viewing this topic.

Offline turboguzzi

  • Old Timer
  • ******
  • Posts: 4,084
Re: Dry clutch on CB750
« Reply #375 on: June 09, 2010, 09:50:00 AM »
rob,

how goes the race testing?

He's out at Spa, give him a break ;)

TG

Offline wannabridin

  • Patience made me a
  • Master
  • *****
  • Posts: 2,237
  • -Garrett
    • 1976 CB750K, under construction:
Re: Dry clutch on CB750
« Reply #376 on: June 09, 2010, 10:24:10 AM »
ahhh, did not know! 
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline BLUE71TURBO

  • Master
  • *****
  • Posts: 1,849
Re: Dry clutch on CB750
« Reply #377 on: June 09, 2010, 10:39:03 AM »
rob,

how goes the race testing?

He's out at Spa, give him a break ;)

TG

 Whatta mean give him a break ?  Someone creates a bada$$ part and you want us all to give them a break ?  Oh hell no !  Were like kids in a candy/toy store !!!   CAN I HAVE IT ?!!!   I WANT IT !!!  NOW !!!   PLEASE, PLEASE, PLEASE !!!  Laying on floor throwing a tantrum !!!   ;D
                                         
« Last Edit: June 09, 2010, 11:08:29 AM by BLUE71TURBO »
Remember; Before you can be old and wise, you must first be young and stupid !

Offline bubbafun101

  • Enthusiast
  • **
  • Posts: 101
    • My K3
Re: Dry clutch on CB750
« Reply #378 on: June 09, 2010, 11:33:18 AM »
Sounds about right Turbo....Gimme  Gimme.

Offline voxonda

  • Master
  • *****
  • Posts: 2,231
Re: Dry clutch on CB750
« Reply #379 on: June 09, 2010, 11:46:06 AM »
Hey Men,

No, am not at Spa yet. Have a small fysical item on hand, but working on that. Well the clutch did not survive the first, hard, test on the bench. After a couple of runs started to sweat just a little and decided to call it a day. We're working on this right now, it is just all part of the fun, ain't it? But it can handle the 81 rwhp, no problem. It bites off the line and sound really good.
Preppin' to go to Spa this weekend.
Will keepin' you updated.

Cheers mates,

Rob
Better sorry for failing then for the lack of trying.

Offline Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: Dry clutch on CB750
« Reply #380 on: June 11, 2010, 05:55:09 AM »
If @ first you don't succeed,PLEASE try again! Vox,you can do it!! ;) :D :D Bill
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline voxonda

  • Master
  • *****
  • Posts: 2,231
Re: Dry clutch on CB750
« Reply #381 on: June 13, 2010, 11:51:38 AM »
Well, just home after a very nice Spa Bikers Classic weekend!
A lot of interseting bikes, esspecially the once that participate in the 4 hour race on Saturday evening.
@Bill: that (little) set back will not stop us. We'll get there, no matter what! ;)

Rob
Better sorry for failing then for the lack of trying.

Offline Sam Green Racing

  • Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,068
  • I REALLY? hate black rims.
Re: Dry clutch on CB750
« Reply #382 on: June 13, 2010, 11:58:22 AM »
Pics please Rob, you know how the children like them ;D ;D ;D glad you had a good time. 8)

Sam. ;)
C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

Offline voxonda

  • Master
  • *****
  • Posts: 2,231
Re: Dry clutch on CB750
« Reply #383 on: June 13, 2010, 12:27:33 PM »
Hey Sam,

Pic's are accoming, but have to take them off my son's camera.

Rob ;)
Better sorry for failing then for the lack of trying.

Offline turboguzzi

  • Old Timer
  • ******
  • Posts: 4,084
Re: Dry clutch on CB750
« Reply #384 on: June 13, 2010, 10:08:56 PM »
Hey Sam,

Pic's are accoming, but have to take them off my son's camera.

Rob ;)

Hei rob

was the honda that took third place a sohc or a dohc?

and what happend to the moto bel guzzi? they where leading by a mile no? still another guzzi won! viva italia!

results here

http://www.ris-timing.eu/~vitesse/4hours/2010/index.htm

TG

Offline voxonda

  • Master
  • *****
  • Posts: 2,231
Re: Dry clutch on CB750
« Reply #385 on: June 14, 2010, 12:14:00 AM »
Hey Sam,

Pic's are accoming, but have to take them off my son's camera.

Rob ;)

Hei rob

was the honda that took third place a sohc or a dohc?

and what happend to the moto bel guzzi? they where leading by a mile no? still another guzzi won! viva italia!

results here

http://www.ris-timing.eu/~vitesse/4hours/2010/index.htm

TG

Hey TG,

All Honda's that I know of or saw were DOHC. Do not know what exactly happened to the MG, think it broke. The MG's are doing a fine job, there where some fine examples. Still 'strange' they are that fast, I wonder...... Problem is getting that the level of competition is so high even to get into the race is a battle of it's own. There are former, very fast GP riders, like Deradiques and Stefan Mertens etc. But they also ran into problems.

Rob
Better sorry for failing then for the lack of trying.

Offline turboguzzi

  • Old Timer
  • ******
  • Posts: 4,084
Re: Dry clutch on CB750
« Reply #386 on: June 14, 2010, 08:15:00 AM »
Hey Sam,

Pic's are accoming, but have to take them off my son's camera.

Rob ;)

Hei rob

was the honda that took third place a sohc or a dohc?

and what happend to the moto bel guzzi? they where leading by a mile no? still another guzzi won! viva italia!

results here

http://www.ris-timing.eu/~vitesse/4hours/2010/index.htm

TG

Hey TG,

All Honda's that I know of or saw were DOHC. Do not know what exactly happened to the MG, think it broke. The MG's are doing a fine job, there where some fine examples. Still 'strange' they are that fast, I wonder...... Problem is getting that the level of competition is so high even to get into the race is a battle of it's own. There are former, very fast GP riders, like Deradiques and Stefan Mertens etc. But they also ran into problems.

Rob

hei rob,

what is the minimum for getting to the start line, 107%, 110% of best lap time? that'd be though...
It's funny how people who proved it all, still have something to prove... :)

TG

Offline mec

  • Hot Shot
  • ***
  • Posts: 503
Re: Dry clutch on CB750
« Reply #387 on: June 14, 2010, 08:36:31 AM »
what is the minimum for getting to the start line,..................130%

moto bel guzzi the engine died, but i am not sure, maybe it was the oilline to the cooler only.

we (horvath-reitprecht guzzi) finished 10th, despite a crash in the night. but the rider managed to stay sitting on the bike, laying at the right side. only one footrest damaged and a broken spark plug (didn´t matter cause of the double ignition). the rider continued racing with the delay of 50 seconds :)

i have seen some sohc´s, but none within ~20th place.

mec
Honda Monkey
Takeuchi TB 070
Massey Ferguson

Offline voxonda

  • Master
  • *****
  • Posts: 2,231
Re: Dry clutch on CB750
« Reply #388 on: June 14, 2010, 09:05:03 AM »
Hi mec,

Sorry I missed you. Spend a lot of ours in the F1-pit area. Like the endurance bikes even better than the GP bikes. How do you explain the speed of the MG compared to the more powerful fours?

Rob
Better sorry for failing then for the lack of trying.

Offline turboguzzi

  • Old Timer
  • ******
  • Posts: 4,084
Re: Dry clutch on CB750
« Reply #389 on: June 14, 2010, 10:05:05 AM »
what is the minimum for getting to the start line,..................130%

moto bel guzzi the engine died, but i am not sure, maybe it was the oilline to the cooler only.

we (horvath-reitprecht guzzi) finished 10th, despite a crash in the night. but the rider managed to stay sitting on the bike, laying at the right side. only one footrest damaged and a broken spark plug (didn´t matter cause of the double ignition). the rider continued racing with the delay of 50 seconds :)

i have seen some sohc´s, but none within ~20th place.

mec

Hei Mec, nice on ya! good result! (or where you hoping to win? :) )

was really wondering who of the german sounding guzzi teams was yours.

Rob, with a 130% window you should be in next year.....

Really sorry i didnt make it, there's always next year (and the new imola 200 event by the same organizers)

TG

Offline mec

  • Hot Shot
  • ***
  • Posts: 503
Re: Dry clutch on CB750
« Reply #390 on: June 14, 2010, 12:33:13 PM »
Hi mec,

Sorry I missed you. Spend a lot of ours in the F1-pit area. Like the endurance bikes even better than the GP bikes. How do you explain the speed of the MG compared to the more powerful fours?

Rob

maybe we will meet next year!?

speed of the MG: there are many facts that make the guzzi ultrafast.

# first of all, its the rider that makes the speed. the motobel and segarra team are racing all over the year, many races, since many years. they do have a lot of experience tuning the bike and winning an endurance race (spare parts, mechanics, rear and front lights, alternator or not,......).

# the MG does have a small lack in engine power. the big four do have ~ 145 rear wheel hp. but no one knows if they will see the chequered flag. this causes that there are a lot of competitors that compete with stock engines. our guzzi passes these bikes and the moderat modified bikes with ease.

# our MG race engine delivered 116NM torque. even the most powerfull fours aren´t any better.

# when you take a look at the frame of the MG (motobel, dynotec, our bike), you will see that the frame geometrie is heavily modified giving modern frame numbers.

# maybe a guzzi race bike does have better aerodynamics.

# there is a great number of MG competitors

mec
Honda Monkey
Takeuchi TB 070
Massey Ferguson

Offline voxonda

  • Master
  • *****
  • Posts: 2,231
Re: Dry clutch on CB750
« Reply #391 on: June 15, 2010, 11:09:10 AM »
Have to agree with mec, the Guzzi's were fast and looking very good. Here's a example which was present on Spa.

Though it is still amazing that the MG's are that fast compared to the fours on a fast circuit like Spa.

Rob
Better sorry for failing then for the lack of trying.

Offline Doctor_D

  • Hot Shot
  • ***
  • Posts: 722
Re: Dry clutch on CB750
« Reply #392 on: June 15, 2010, 11:23:50 AM »
For sport-tourer's, bikes like the V7 Sport have proven to be tough competitors in vintage roadracing.  I'm very impressed.

A V7 is definitely on my list should the right bike come available at the right time...
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline turboguzzi

  • Old Timer
  • ******
  • Posts: 4,084
Re: Dry clutch on CB750
« Reply #393 on: June 19, 2010, 02:14:53 AM »
For sport-tourer's, bikes like the V7 Sport have proven to be tough competitors in vintage roadracing.  I'm very impressed.

A V7 is definitely on my list should the right bike come available at the right time...

Speaking from what I see here in italian vintage RR, as a 750 / V7, Guzzi's are not that competitive, a bit overweight/underpowered.

But essentially the same bike as 1100-1200cc, is a monster :), specially in vintage endurance

not cheap to build and setup though. to get a choice of gear ratios you need three-four different final bevel boxes and the must have CR gearbox is very hard to find, even here

racing at speed with a shaft drive takes some getting used to too.

I considered at one point turning my LM III into an open claser, way out of my budget!

TG


Offline wannabridin

  • Patience made me a
  • Master
  • *****
  • Posts: 2,237
  • -Garrett
    • 1976 CB750K, under construction:
Re: Dry clutch on CB750
« Reply #394 on: July 06, 2010, 06:58:31 AM »
hey Rob!  any updates?  i've been patiently waiting, haha
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline Sam Green Racing

  • Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,068
  • I REALLY? hate black rims.
Re: Dry clutch on CB750
« Reply #395 on: July 06, 2010, 07:28:20 AM »
You've been so quiet Gee, thought you'd emigrated. ;D ;D ;D ;D

Sam. ;)
C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

Offline wannabridin

  • Patience made me a
  • Master
  • *****
  • Posts: 2,237
  • -Garrett
    • 1976 CB750K, under construction:
Re: Dry clutch on CB750
« Reply #396 on: July 06, 2010, 08:15:47 AM »
haha, nope, just slowly realized the funds aren't quite where i'd like, so no need to excite myself over something i can't quite afford yet...   :(
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline Sam Green Racing

  • Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,068
  • I REALLY? hate black rims.
Re: Dry clutch on CB750
« Reply #397 on: July 06, 2010, 08:21:43 AM »
Damn Gee, thought you were gonna be the guinea pig...errr.. factory tester ;D ;D ;D ;D ;D

Sam. ;)
C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

Offline voxonda

  • Master
  • *****
  • Posts: 2,231
Re: Dry clutch on CB750
« Reply #398 on: July 06, 2010, 08:48:16 AM »
Hey kids, stop foolin'around!  ;D

Hey G, due to illness on my part and a economy that is slightly improving not been able to do a lot on the clutch. There was a minor problem with a oilseal when tested on the bench, been replaced but not tested yet. There is a second one build to put in the bike I am building at this moment in order to street and tracktest. Am moving house shortly so that will take up some time, but we're still progressing.

Cheers, Rob
Better sorry for failing then for the lack of trying.

Offline wannabridin

  • Patience made me a
  • Master
  • *****
  • Posts: 2,237
  • -Garrett
    • 1976 CB750K, under construction:
Re: Dry clutch on CB750
« Reply #399 on: August 17, 2010, 06:34:28 AM »
so Rob, how's the health?

on a lower note, how's the clutch coming along?  winning any races with it yet??
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...