Author Topic: Shock Absorbers (Read 22050 times)

voxonda · « **Reply #50 on:** February 28, 2011, 11:05:36 AM »

Thanks Nap,

Length from hart of pivot to beginning of rearaxle recess and (inside)width at rearaxle, please.

Kind regards, Rob

napoleonb · « **Reply #51 on:** February 28, 2011, 12:30:17 PM »

Hi Rob,

No problem, from the centre of the axle to the beginning of the recess is 440mm.
The width is 265mm and if i remember correctly the offset to the left is 10mm but my frame is at school so if you really want to know you'll have to wait until tomorrow.

voxonda · « **Reply #52 on:** February 28, 2011, 01:12:16 PM »

Hey Nap,

Thanks mate, this will do.

Cheers, Rob

voxonda · « **Reply #53 on:** February 28, 2011, 01:23:53 PM »

Quote from: Phil on February 28, 2011, 06:19:26 AM

Most informative. I am still going for Maxton T260-C shocks. The question is what length! Anyone know if a K7 swing-arm is the same length as the F2 one?

Phil,
K7 seems to be same dimensions as F2, length pivot to begin of recess 17 5/16" (440m/m) and width 10 15/32" (266 m/m).
OEM K2-K6 shocks 330 m/m, with longer swing would go up to 360 m/m. But that's me.

Rob

duflacci · « **Reply #54 on:** February 28, 2011, 06:02:13 PM »

So a question for you Formula 750 racers is a K7/F2 swingarm AHRMA legal?

Phil · « **Reply #55 on:** March 01, 2011, 08:15:05 AM »

Thanks everybody. I'll stay with the stock swinging arm and order standard length shocks from Maxton.

hesselfuzz · « **Reply #56 on:** March 01, 2011, 09:21:15 PM »

The difference I've noticed between my K1/K3 and my F2 is that the mount for the shock on the swingarm is 3/4" further back on the F. What this means I haven't a clue.

Retro Rocket · « **Reply #57 on:** March 01, 2011, 10:07:43 PM »

Quote from: hesselfuzz on March 01, 2011, 09:21:15 PM

The difference I've noticed between my K1/K3 and my F2 is that the mount for the shock on the swingarm is 3/4" further back on the F. What this means I haven't a clue.

It changes the shock angle, to a supposed better position for the rear suspension to work, it was a common mod for racers in the 70's and is still done on post classic racers today....

Mick

Sam Green Racing · « **Reply #58 on:** March 01, 2011, 10:35:50 PM »

Mick, is the shock angle different or might the top mount be further back as well, perhaps hesselfuzz could check that out as well.

Sam.

Retro Rocket · « **Reply #59 on:** March 01, 2011, 10:38:26 PM »

Hi Sam, on my F frame the top support is in the same place as my K, i think they are all the same as far as the top mount goes.

Mick

Big Bob · « **Reply #60 on:** March 02, 2011, 07:12:48 AM »

Quote from: duflacci on February 28, 2011, 06:02:13 PM

So a question for you Formula 750 racers is a K7/F2 swingarm AHRMA legal?

10.2.1A states "Modifications must be consistent with the spirit of the class."

I'd say you're good to go.

andy750 · « **Reply #61 on:** March 02, 2011, 07:30:10 AM »

Great discussion! One question - can the longer F2 swing arm be fitted to an earlier K (K2 specifically) with no modifications except longer chain? Or will brake stay also have to be changed?

Thanks
Andy

voxonda · « **Reply #62 on:** March 02, 2011, 07:45:35 AM »

Andy,

No mods needed for mounting. But a brakestay has to be mounted to underside of swing. On a F2 the stay is on top.

Rob

Sam Green Racing · « **Reply #63 on:** March 02, 2011, 07:48:45 AM »

If the answer is yes to it fitting, then you'll have problems as the anchor point for the disc is on top of the arm and for the drum it's underneath. Beam me up Scotty

Sam.

Sam Green Racing · « **Reply #64 on:** March 02, 2011, 08:02:28 AM »

I guess you type quicker than me Rob.

kos · « **Reply #65 on:** March 02, 2011, 08:10:09 AM »

Oh, but you must read further.

Section10.3.1 Formula 750 Eligible bikes built prior to Dec 31st 1972

CR/RC SOHC 750 Hondas in stock frames with unmodified swingarm.

So by the book, answer is NO. (because you are installing a newer swingarm)

But in reality, there is no one at AHRMA who would know the difference and with two strokes now allowed into class..it will be a joke within a year anyway!

Also, with Will "the Pill" Harding calling the shots when there is a protest, he could'nt make a decision his life depended on it.

I say...go for it but don't do any bracing that they can see.

KOS

Sam Green Racing · « **Reply #66 on:** March 02, 2011, 08:39:23 AM »

Are you condoning cheating Mr McGrew ?

Sam.

napoleonb · « **Reply #67 on:** March 02, 2011, 09:36:30 AM »

The K7 has the brake mounting point on the more or less the same location as an earlier type.
You will have to change the shock mount on your frame.

andy750 · « **Reply #68 on:** March 02, 2011, 10:07:39 AM »

Thanks guys thats the info I was looking for. Much appreciated!

Andy

Retro Rocket · « **Reply #69 on:** March 02, 2011, 01:50:04 PM »

Quote from: napoleonb on March 02, 2011, 09:36:30 AM

The K7 has the brake mounting point on the more or less the same location as an earlier type.
You will have to change the shock mount on your frame.

Why.?

Mick

napoleonb · « **Reply #70 on:** March 02, 2011, 03:23:24 PM »

The left hand side of the swingarm has an approximatly 10mm offset to the left.
Your spring mounting on the frame hasn't got enough room to accomodate this much offset.

somesuch · « **Reply #71 on:** March 02, 2011, 04:11:35 PM »

Quote from: napoleonb on March 02, 2011, 03:23:24 PM

The left hand side of the swingarm has an approximatly 10mm offset to the left.
Your spring mounting on the frame hasn't got enough room to accomodate this much offset.

to accommodate the corresponding amount of increase in sprocket carrier? So what would be the easiest modification?

--Nick

Retro Rocket · « **Reply #72 on:** March 02, 2011, 04:14:11 PM »

Quote from: napoleonb on March 02, 2011, 03:23:24 PM

The left hand side of the swingarm has an approximatly 10mm offset to the left.
Your spring mounting on the frame hasn't got enough room to accomodate this much offset.

So it needs a longer mount on the frame, is that what you mean.?

Sam Green Racing · « **Reply #73 on:** March 02, 2011, 04:21:46 PM »

Quote from: napoleonb on March 02, 2011, 03:23:24 PM

The left hand side of the swingarm has an approximatly 10mm offset to the left.
Your spring mounting on the frame hasn't got enough room to accomodate this much offset.

Ya wonna see the Auto set up.

Sam.

Retro Rocket · « **Reply #74 on:** March 02, 2011, 04:37:53 PM »

Quote from: SamCB750A on March 02, 2011, 04:21:46 PM

Quote from: napoleonb on March 02, 2011, 03:23:24 PM
The left hand side of the swingarm has an approximatly 10mm offset to the left.
Your spring mounting on the frame hasn't got enough room to accomodate this much offset.

Ya wonna see the Auto set up.

Sam.

See it...!!!!! we want to hear the bloody thing......{same as you i assume..

}

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Author Topic: Shock Absorbers (Read 22050 times)