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 Post subject: TZ350 different weight spring
PostPosted: Wed May 04, 2011 10:18 am 
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Joined: Fri Apr 20, 2007 8:31 am
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Hi
I want to upgrade the spring on my tz.
http://www.greenhamracing.co.uk/page22.html
Is there anyone that can help me to choose the right one?

The bike is a Spondon TZ1979 and I am weighting 85 kilos plus gear.

At the front I have now ordered Race Tech valves.
what spring should I have?

Arild 8)


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 Post subject: Re: TZ350 different weight spring
PostPosted: Thu May 05, 2011 1:42 pm 
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Here is the answer I got from Dawn at Greenham Racing
"Hi Arild

Please see below:-

Stock No Spring Rate Colour Code Metric Weight Imperial Weight
MO023 ½ Kilo Blue 72kg 11st 4lbs
MO022 1 kilo Green 80kg 12st 8lb
MO025 2 kilo Silver 95kg 15 st

I would probably recommend the silver 95kg spring."

I am also considering the shock from Davies Motorsport. Does anyone have any comments on that one?

Arild [smilie=icon_wink.gif]


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 Post subject: Re: TZ350 different weight spring
PostPosted: Sat May 07, 2011 6:09 am 
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Hi Arild,

Recomend D Faulkner Springs LLP, They will make you any spring you like progressive or normal.

I had a fork Maxton conversion done on a pair of TZ 350E forks, which improved the patter, but did not stop bottoming out under heavy braking, Mallory Hairpin for example.

A Pre Load increase would have affected the front end spring rates at all times, so I had Faulkners make me a pair of fork springs where the last 15% of compression was at a progressivly higher rate, and this worked a treat. They make for many of the suspension experts in the UK, and supply some race car manufacturers, their prices are very reasonable, and the time they will spend with you and your springs is quite amazing.

Faulkners contact details are +44 (0) 1234 543049 sales@dfaulknersprings.com

This year I have gone for forks off a later Yamaha, with compression rebound and preload adjustment and a rear unit with compression. rebound, preload, and ride height adjustment, Have run it at Mallory and Oulton, and it feels a lot better, I have also changed the lead (Offset) on the fork legs, had my own yokes made and find it turns faster.

Just got to find a few more horses, and it should be quite scarey!!!

Best of luck,

Mike


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 Post subject: Re: TZ350 different weight spring
PostPosted: Sun May 08, 2011 9:41 am 
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Hi Mike
Thank you for info.
I have now settled for the Shock from Davies Motorsport, and hopefully this will do the job.
Do you have any spesifications on the springs they made for you, and what is your weight?
How did you alter the yokes?
Arild.


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 Post subject: Re: TZ350 different weight spring
PostPosted: Mon May 09, 2011 8:50 pm 
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Hi Arild,

Fork Yokes.
I worked out the dimensions from the wheel spindle length back, took into account the thicker fork legs needed different centres, worked out the offset from modern 250 - 125 practice, made a couple of drawings, got bids from fabricators, discussed the spec and the materials with them, modifed the spec slightly, put in my order, waited, paid the bill and got the yokes, simple really.

If you want fork springs made Faulkners will need your weight (Dressed to Race) and the weight of the bike, half fill the tank, a TZ 350 weighs anything from 100 kgs up to 116 Kgs, depending on if it's wet or dry, and which book you believe. Mine is a genuine 100 Kgs, no fuel but with oil and water.

If you want them to my design they will have that in their records just ask.

Good Luck,

Mike


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 Post subject: Re: TZ350 different weight spring
PostPosted: Tue May 10, 2011 5:20 am 
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I had springs wound a year back for 2 of our TZ350's. 0.70kg/mm for the front worked a treat for a rider who's 80-85kg without gear. These were straight rate. I'm not a late braker, but general theory from our local suspension guy is straight rate, not progressive and use air gap / oil height.

The original 350E springs were something like 0.45 or so. Note that modern TZ125 are stiffer and 2/3rds the weight..... :oops:

BUT I do like MIke DH's idea of mostly the rate you want and the last bit higher which is the reverse of what most progressively wound springs are. These tend to use the lightest bit as soon as the bike is off the stand, and you only have to crank preload in to get the sag you want (defeats the purpose of the progressive wind!).

Al

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 Post subject: Re: TZ350 different weight spring
PostPosted: Tue May 24, 2011 9:32 pm 
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I received the shock from Davies Motorsport today. Fast delivery, and it looks absolute fantastic.
:mrgreen: :mrgreen:
A few years ago I bought a TZ shock from Maxton and it took several months to deliver, and when I bought a pair for my RG they called me after a year and asked if I still wanted them :shock:
Arild


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 Post subject: Re: TZ350 different weight spring
PostPosted: Mon Jul 18, 2011 6:48 pm 
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Joined: Mon Jan 29, 2007 9:55 pm
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Location: Sao Paulo, Brazil
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Hi Arild,
Have you run the bike with the new rear shock? How did it work out?
Cheers,
Bob


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