Author Topic: 76 F model project- mono shock suspension  (Read 39778 times)

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Offline Retro Rocket

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Re: 76 F model project
« Reply #25 on: January 01, 2015, 10:52:41 pm »
Who is it/was it that was doing the bolt kit for them? Flush hex head I believe? Mark McGrew? The German guys that are/were making the cush rubbers? Classic City?

I wonder how far off original balance those welds are?

I just suggested to Elan to consider making new cush rubbers for these since he has a handle on the oil stopper seal rubber component.

Brian {bear} has heavy duty cush rubbers, or can get them.... ;)
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If You can't fix it with a hammer, You've got an electrical problem.

Offline Bill/BentON Racing

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Re: 76 F model project
« Reply #26 on: January 02, 2015, 07:10:54 am »
Nah, found it yesterday in a box of old stuff! K. RC did weld etc. going to check my old catalog and see what it says, Bill
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Offline cbr954

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Re: 76 F model project
« Reply #27 on: January 02, 2015, 04:04:01 pm »
Will have to look into the heavy duty cush rubbers.
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F2 head), 2017 CRF450R, 2001 CR250R, 72 CB500, 79 XR250, 04 CRF50,70's soon to be rebuilt cb750 drag bike.

Offline Retro Rocket

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Re: 76 F model project
« Reply #28 on: January 03, 2015, 04:37:38 pm »
Will have to look into the heavy duty cush rubbers.

Mark at M3 racing in the US sells them as well...

http://www.m3racing.com/graphics/parts/hvydtyprimdrrbrs_lg.jpg

http://www.m3racing.com/products/parts.html

6th down from the top.... ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline cbr954

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Re: 76 F model project
« Reply #29 on: January 03, 2015, 04:59:00 pm »
03 CBR954RR, 72 750 chopper(970cc
F2 head), 2017 CRF450R, 2001 CR250R, 72 CB500, 79 XR250, 04 CRF50,70's soon to be rebuilt cb750 drag bike.

Offline Retro Rocket

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Re: 76 F model project
« Reply #30 on: January 03, 2015, 05:25:18 pm »
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline johno

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Re: 76 F model project
« Reply #31 on: January 04, 2015, 03:05:32 am »
Bear would be 3 months quicker ;)
GRASSHOPPER SOHC HONDAS ARE THE MEANING OF LIFE.

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: 76 F model project
« Reply #32 on: January 04, 2015, 12:11:38 pm »
And less likely to get hosed (no more comment)..................
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline kmb69

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Re: 76 F model project
« Reply #33 on: January 04, 2015, 03:20:08 pm »
I personally know that's right! No more comment......for now.

Offline dragracer

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Re: 76 F model project
« Reply #34 on: January 04, 2015, 06:11:05 pm »
Well crap fellas, don't hold back now. You might as well throw all of it up against the wall so we can see the full picture.

Offline kmb69

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Re: 76 F model project
« Reply #35 on: January 04, 2015, 07:50:48 pm »
Still owes me parts I already paid for over 2 years now. Made promises, on this forum no less, and still hasn't delivered. There was a thread on this forum a while back that got to the point that the moderators locked it. At least in my case, it's relatively low dollar stuff, but that's not the point and not so much for some other folks, I'm told. I wouldn't pi$$ on him if he was on fire.

The only thing that lives on beyond a man's grave is his reputation.

Offline bear

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Re: 76 F model project
« Reply #36 on: January 05, 2015, 01:28:25 am »
I wouldn't pi$$ on him if he was on fire.


Nice turn of phrase Keith.
There you go Frank, it's up against the wall. ;D ;)

Cheers,
Brian
The older I get the faster I was.

Offline kmb69

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Re: 76 F model project
« Reply #37 on: February 02, 2015, 08:00:08 pm »
Damn Frank, didn't mean to kill your thread!  ??? :-\ ;)

Offline dragracer

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Re: 76 F model project
« Reply #38 on: February 03, 2015, 01:26:13 pm »
Damn Frank, didn't mean to kill your thread!  ??? :-\ ;)


Not an issue Keith. Open communication is always welcomed on any thread of mine.

Someone had to keep it active. I haven't touched the project lately as I've been concentrating on other things. I'm trying to get the wife's new car tire drag bike together before I work on any of my bikes.

Happy wife, happy home. Lol

Offline dragracer

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Re: 76 F model project
« Reply #39 on: October 16, 2015, 05:06:55 pm »
Alright, i'm refreshing this thread. I decided to start messing around with the F model chassis again. My plan is to set this one up with a mono shock swingarm. The arm i'm using is from a 2001 Katana 600. The later arms are longer than the early model Kat arms. The 2001 arm is actually 6 1/2" longer than the stock F model arm. I intend to extend the arm an additional 5" so i can at least get the same wheelbase as my 78' F model. The Kat arm is slightly wider at the pivot than the Honda arm and won't fit inside the frame. I ended up grinding inside the frame on both sides so it would fit. The pivot bolt for the Honda is a bit smaller than the stock Kat pivot bolt. Instead of using bushing inside the Kat arm so i could use the stock Honda bolt, I decided to drill out the hole in the frame with a 5/8" bit so i could use the Kat pivot bolt. I mounted the arm and then bolted the shock linkage onto the arm. I was trying to determine the location for welding tabs on the rear of the cross bar on the frame where the bottom engine mounts are located. I didn't have a shock absorber on hand so i wasn't able to figure out where the upper shock mount needed to go at the rear of the engine cradle. I've installed a Kat arm on another F model in the same manner so i just need to take a look at it and get some measurements. Using the Kat arm will also allow me to use the stock Kat rear wheel assembly with brakes and sprocket carrier. Most Kat parts are cheap in junk yards and on Ebay so i'll start sourcing them soon. The stock 17" rear wheel isn't wide but it should accommodate a 180 shinko hookup tire so i can have some sticky rubber. If not, i may use an RC Comp 17" x6" rear wheel i've got laying around. Obviously i'll have to use an offset front sprocket and i'll pick on of those up from Cycle Ex.

Find below some pictures of what i did tonight.
« Last Edit: October 16, 2015, 08:34:10 pm by dragracer »

Offline dragracer

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Re: 76 F model project
« Reply #40 on: October 16, 2015, 08:43:22 pm »
I think i had some duplicates- sorry. Hopefully you all get the point. This arm can also be set up with dual shocks if necessary. The only draw back to the KAt arm is its steel and not aluminum. Therefore, its not lightweight so if saving weight isn't important to you, then this is the simplest way to get an extended arm with the ability to put a newer, wider wheel on your bike with updated brakes. I haven't attempted to use the KAt front wheel but i think it would work inside the stock Honda forks. That will be my next step once i get the rear half worked out completely. I'm going to rake the frontend a little just so the wheel will clear the sidewinder i hope to install on the bike. I'm going to use Don R.'s method of raking the neck this time and hope i don't screw anything up-lol.

I'm going to cut everything off this frame i don't need so i can shave some weight thats been added by the steel arm. Eventually, if i keep messing with this bike,  i'm going to have a light chromemoly arm done by Hardcore Arms. I'm concentrating on the chassis first and may put a basically stock motor in the frame just to show the gains one can get by a properly set up race chassis.

Standby, more to come in the next few days.
« Last Edit: October 16, 2015, 08:59:28 pm by dragracer »

Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #41 on: November 11, 2015, 12:03:11 pm »
Look what the UPS man brought. I snagged a light weight PM front wheel off Ebay for the project- its even got a Billy Bling, Bling valve stem cap ;D. I've already got a 17" rear wheel to match. Should work just fine with a CycleEx offset front sprocket. Now to sort out which frontend I'm going to use. I'll look at how long to extend the swingarm and begin setting the chassis up in the next few months. Still trying to sort out what route to take on the motor build but I do know its got to be at minimum 72mm high compression piston set up with an F2 head. 

Offline 754

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Re: 76 F model project- mono shock suspension
« Reply #42 on: November 11, 2015, 04:52:51 pm »
Chicane.... Mitchell wheel from Performance Machine.. 
 A buddy runs one on the salt, and it is very light..... Nice wheel..
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Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #43 on: November 11, 2015, 07:20:56 pm »
Chicane.... Mitchell wheel from Performance Machine.. 
 A buddy runs one on the salt, and it is very light..... Nice wheel..

Yeap, a Chicane. I've got a set on my F model and a set on my KZ 1000, 8.88 index bike. These wheels are light. I'm trying to reduce weight in as many places as possible. Unfortunately the swing arm I plan to use for now is heavier than I would like but its what's on hand. Eventually if I keep messing with the package, I'll source a cheap, used chromemoly arm. I'm going to gut a stock tank out into a basic shell and fit a small aluminum fuel cell underneath. I need this bike to be lighter than my current F prior to installing the onboard starter set up. I'm going to use only the tapered portion of the rotor that bolts to the starter clutch. The rest will get cut, ground or torched off to eliminate reciprocating weight on the end of the crank. I'll likely use a 24 volt start system due to my desire to build a 73mm high compression engine.

Offline Bill/BentON Racing

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Re: 76 F model project- mono shock suspension
« Reply #44 on: November 24, 2015, 12:45:18 pm »
I need those wheels!!  I got 73mm stuff to trade, lots of  it, but no light 17/18 setup, let me know.Bill  ;D
BentON Racing Website
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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.
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Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #45 on: November 24, 2015, 02:34:54 pm »
Ahhhh, holding back on me about having those pistons till you saw my wheel!!!! Sorry man but this one goes on the project bike. I wish I'd have known you were interested in this type wheel when we were in Valdosta. Mike Durham had a nice one just like it for sale. I'll check to see if he still has it .  I figured you preferred the bling gold anodized spoke wheels. These things are very difficult to find like a perfect set of golden rods

Offline Bill/BentON Racing

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Re: 76 F model project- mono shock suspension
« Reply #46 on: November 24, 2015, 03:04:33 pm »
Yes, please check, I'll take it....gotta be mo like Frank! LMAO, Bill
BentON Racing Website
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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.
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Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #47 on: December 04, 2015, 09:38:03 am »
Yes, please check, I'll take it....gotta be mo like Frank! LMAO, Bill

Real funny Bill, really funny. Don't follow my example cause I don't know "jack" about the race game. Besides, you're the old  racing/ wrenching veteran and should be teaching the rest of us all your tricks.

Online gschuld

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Re: 76 F model project- mono shock suspension
« Reply #48 on: December 04, 2015, 10:14:22 am »
Grumble, grumble ..."OK settle down kids.  Don't make me pull this car over.  If I do, you two are really gonna get it..." ;D

George

Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #49 on: December 04, 2015, 11:11:12 am »
Grumble, grumble ..."OK settle down kids.  Don't make me pull this car over.  If I do, you two are really gonna get it..." ;D

George
[/quote

Grumble, grumble ..."OK settle down kids.  Don't make me pull this car over.  If I do, you two are really gonna get it..." ;D

George

Awwww, come on daddy, you know we boys just wanna beat up on each other from to time. It makes us tougher. Lol. Bill and I are teammates and friends regardless to what it might seem at first glance.  What you perceive going on with us is just good natured humor. We're on the same piece of paper most of the time, but occasionally on diagonal corners. Hahaha.

 

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