Author Topic: 76 F model project- mono shock suspension  (Read 39774 times)

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Online gschuld

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Re: 76 F model project- mono shock suspension
« Reply #50 on: December 04, 2015, 11:21:30 am »

Awwww, come on daddy, you know we boys just wanna beat up on each other from to time.

I feel, well, a little creeped out when you call me daddy ???...... ;D. Carry on...

George




Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #51 on: December 04, 2015, 12:06:26 pm »
Hahaha, lets keep it light. Lifes to short not to have some fun.

Offline Bill/BentON Racing

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Re: 76 F model project- mono shock suspension
« Reply #52 on: December 04, 2015, 12:27:57 pm »
Yep, what me brother said!  ;D, Bill aka Grasshopper. All good fun, but man oh so motivating!! Somebody's going to surprise someone! ! Don't forget  D or our Houston connection!  C'mon down and play, K.
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Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #53 on: December 04, 2015, 12:50:46 pm »
Yep, what me brother said!  ;D, Bill aka Grasshopper. All good fun, but man oh so motivating!! Somebody's going to surprise someone! ! Don't forget  D or our Houston connection!  C'mon down and play, K.

I kind of figured you were collaborating with one or both of them to put together a surprise for next season. You've got to use any and all resources at your disposal to meet your goal. Its just me and my shade tree over here but I'm going to spend some time under a limb formulating a solid plan. Neither the bike or the rider were as consistent as they should have been this season. Got to get both on the same upward swing.
« Last Edit: December 04, 2015, 12:57:30 pm by dragracer »

Offline Bill/BentON Racing

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Re: 76 F model project- mono shock suspension
« Reply #54 on: December 04, 2015, 06:42:07 pm »
Nope, just me and my shade tree right now! ;D, 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.
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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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Online gschuld

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Re: 76 F model project- mono shock suspension
« Reply #55 on: December 04, 2015, 07:02:00 pm »
Is that your holy head?  What's the deal with the drilled head cooling fins.  RC did that VERY early on with a few engines that I know of, but didn't see much of that since.  RC drilled more, but smaller diameter holes from the chamber end up to but not into the top fin layer.

George

Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #56 on: December 04, 2015, 08:43:47 pm »
Yeah, what's the purpose of those holes??

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: 76 F model project- mono shock suspension
« Reply #57 on: December 04, 2015, 09:51:18 pm »
Lightening it and cooling it AND trying to break Frank's record ;-)

Frank may have to start using some of those super light top secret pink 6mm bolts to counteract those holes!
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #58 on: December 04, 2015, 10:03:17 pm »
Lightening it and cooling it AND trying to break Frank's record ;-)

Frank may have to start using some of those super light top secret pink 6mm bolts to counteract those holes!

Jerry,

Records are meant to be broken. Its open to anyone to re-set just like I did- I've got the official certificate to prove it along with my name in the books. But wouldn't it be fitting if Bill was able to lower it next season?? That turbo bike, Purple Rain,  might be the ideal candidate for a 9 second pass ??

Uhhh, the light weight, pretty bolts are a BIG NO!!! Bling never made me fast.   

Offline Medyo Bastos

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Re: 76 F model project- mono shock suspension
« Reply #59 on: December 05, 2015, 05:14:52 am »
i always heard that red paint drops 60' ;D

Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #60 on: January 23, 2016, 08:23:26 am »
Medyos reminded me about this thread. I haven't posted in a while because I've been focusing on building a high compression engine for this chassis. Also looking at the possibility of having n aftermarket chromemoly arm built to keep the weight down. Standby cause something is about to happen soon.

Offline Medyo Bastos

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Re: 76 F model project- mono shock suspension
« Reply #61 on: January 23, 2016, 03:17:31 pm »
how much longer are you wanting that arm?  love that mitchell!


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Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #62 on: January 23, 2016, 09:19:40 pm »
I need to extend that Katana 600 arm about 6-7" to at least match the wheelbase on my 78' F model. Problem with that arm is its made of steel and heavy. Thats the main reason i'm contemplating an aftermarket chromemoly arm- its much lighter. I just hate to spend that $600 for the new arm when i can spend  $200 or less extending the Kat arm. That $400 would go far on parts for the engine and chassis. Decisions, decisions.

Offline scottly

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Re: 76 F model project- mono shock suspension
« Reply #63 on: January 24, 2016, 04:46:35 pm »
Frank, how long is the Kat arm? Most mono shock MX bikes have rather long aluminum arms, like 24" pivot to axle.
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Offline 754

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Re: 76 F model project- mono shock suspension
« Reply #64 on: January 24, 2016, 06:50:32 pm »
Its around 7.5 over.. I was going to take about 3 inches off the front of mine to use it.
« Last Edit: January 24, 2016, 06:53:26 pm by 754 »
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Offline scottly

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Re: 76 F model project- mono shock suspension
« Reply #65 on: January 24, 2016, 07:17:23 pm »
How long is it from the pivot to the axle?
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Offline 754

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Re: 76 F model project- mono shock suspension
« Reply #66 on: January 24, 2016, 07:55:17 pm »
I will wait for Frankie to answer that.
What i like about the arm, and I considered a few. Its steel, not my favorite but..I would have no qualms about welding to it..  Cant say that about Aluminum, unless willing to heat treat it.. At 150 bux plus shipping 2 ways
And it looks Ok ...pretty nice actually.
 Bigger pivot but I can deal with that.. I will cut the front off mine, move pivot back..
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Offline scottly

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Re: 76 F model project- mono shock suspension
« Reply #67 on: January 24, 2016, 08:36:48 pm »
Yeah, I understand about welding on an alloy arm, but I would be more concerned about the greatly increased pressure on the shock mount, with both a longer arm and the heavier spring required for a bike that weighs twice as much. Just throwing it out for discussion.. ;)
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Offline 754

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Re: 76 F model project- mono shock suspension
« Reply #68 on: January 24, 2016, 08:41:21 pm »
 The arm is off a 1100 or 1150...
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Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #69 on: January 24, 2016, 09:14:02 pm »
Scottly, the Katana arm is approximately 24" long.  This isn't the first Katana arm i used on a Honda F model. We extended that one about 3-4" but it was an earlier model arm and not quite as long as the 2000' arm i'm using. It went on a street bike so I didn't want it to be too long because the owner wasn't interested in extending the seat pan to fit the overall wheelbase. I attached a picture to this post. We put an early model GSXR 1100 frontend on the bike. I rebuilt a stock motor for him but i'm about to start on an 836 so he can have a bit more power.

Like i said before, the pros of the Kat arm are its steel and can be welded and extended easily. The cons are its steel and its heavy and will be even heavier with the extra 6-7" added. I've never given any thought to using a dirt bike arm. You've planted a seed i need to cultivate. Thanks

Offline cbr954

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Re: 76 F model project- mono shock suspension
« Reply #70 on: January 25, 2016, 06:33:45 am »
My 03 honda crf450 swingarm is 23" pivot to axle.  Not sure where they get them done but the hill climbing guys have a foot or more added to the swingarms, some of them are very long and use the stock front piece.
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Offline Medyo Bastos

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Re: 76 F model project- mono shock suspension
« Reply #71 on: February 12, 2016, 06:02:17 am »
is the gsxr frontend bolt on, or did it take mods to work?


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Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #72 on: February 12, 2016, 09:11:06 am »
is the gsxr frontend bolt on, or did it take mods to work?


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It was not bolt on. But still fairly simple. You will need to use the Honda stem. Press it and out then have it set up in the GSXR lower triple. The GSXR stem was longer I think and it kept me from sourcing bearings at the time. I think Alls Balls does carry conversion bearings now but I wasn't aware of it at the time.

Offline Medyo Bastos

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Re: 76 F model project- mono shock suspension
« Reply #73 on: February 12, 2016, 03:36:38 pm »
i am really liking this, and getting motivated to steal your ideas  ;D ;D ;D  how does the shock attach to the frame?

Offline dragracer

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Re: 76 F model project- mono shock suspension
« Reply #74 on: February 14, 2016, 07:21:12 pm »
i am really liking this, and getting motivated to steal your ideas  ;D ;D ;D  how does the shock attach to the frame?

I've got the engine off the 75 F model street bike right now to freshen it up. The fram is still at my buddy's house. I'll try to get by and take some more pictures of the frame work for the shock. We didn't take many when it was being built. There was a build thread somewhere on this forum but it only has sporadic updates. I'll look for the link to that one. I'll be picking at the current F model project in the next month or so. I'm messing with an old car for now.

 

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