Rise the bike 5cm

  • gordone
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13 Feb 2018 10:20 - 13 Feb 2018 10:20 #778690 by gordone
Rise the bike 5cm was created by gordone
When I rebuild the front fork with new part the total height went up approx. 5 cm... when I received the Hagon rear suspension today, they was also approx 5 cm longer.
So my bike will be 5cm higher in front and rear then before, what effect will these has on the handling?

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Last edit: 13 Feb 2018 10:20 by gordone.

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13 Feb 2018 10:44 #778693 by Nessism
Replied by Nessism on topic Rise the bike 5cm
When the engine is installed and there is gas in the tank the height will drop a 2-3 cm.

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  • gordone
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13 Feb 2018 22:47 - 14 Feb 2018 06:29 #778732 by gordone
Replied by gordone on topic Rise the bike 5cm

Nessism wrote: When the engine is installed and there is gas in the tank the height will drop a 2-3 cm.


When I measure the actual length between old and new rear suspension the new Hagon is 4cm longer.

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Last edit: 14 Feb 2018 06:29 by gordone.

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14 Feb 2018 06:54 #778746 by Kidkawie
Replied by Kidkawie on topic Rise the bike 5cm
New or rebuilt suspension needs to break-in.

1975 Z1 900
1994 KX250 Supermoto
2004 KX125

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14 Feb 2018 07:31 #778748 by Nessism
Replied by Nessism on topic Rise the bike 5cm

gordone wrote:

Nessism wrote: When the engine is installed and there is gas in the tank the height will drop a 2-3 cm.


When I measure the actual length between old and new rear suspension the new Hagon is 4cm longer.


4 cm longer is a lot. Why did you purchase shocks that were that long?

On my 750 the swingarm would hit the stock mufflers unless the shocks were kept to within about 1.5cm of the stock length.

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14 Feb 2018 08:57 - 14 Feb 2018 08:57 #778754 by JR
Replied by JR on topic Rise the bike 5cm
Gordone;
If you keep the longer shocks then when you check and adjust the chain make sure you do this with the rear wheel on the ground and not with bike on the centre stand otherwise the drive chain can end up to tight.

1980 kz750E1, Delkevic exhaust
Last edit: 14 Feb 2018 08:57 by JR.
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14 Feb 2018 18:38 #778779 by SoyBoySigh
Replied by SoyBoySigh on topic Rise the bike 5cm
I agree that you're gonna need to put the WHOLE bike together, 'cause there's a "SAG" factor wherein the bike's own static mass will compress the suspension, and the rider will compress it further. If you're talking about a half-built machine, that'd explain everything.

BUT IF NOT, if you're only talking about work done on the suspension alone, and your bike already IS fully assembled? Well then I'd wonder whether your OEM springs and shocks were cut down by a previous owner. You're sure they're OEM shocks and not a stock-STYLE of "Shorty" shock set? And the original springs well, I could definitely see 'em wearing out and sagging further. Maybe the rear shocks as well!

I guess you'd want to look at the specs from the manual, accounting for all of the other factors you've changed such as tire aspect ratio etc, and look at the seat height of the completed bike. IF you're doing a bone-stock restoration, this would be a lot easier than if you've changed a whole bunch of stuff.

But yeah, I'd suspect the P.O. might have dropped in springs from another model, shorty shocks etc - OR they could be worn out.

UNLESS of course, the seller you bought 'em from made a mistake - in BOTH instances though? If you measure the original springs, perhaps the sellers could help clear up whether those original fork springs were intended for your bike in the first place.


-Sigh.
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