Real weight distribution front/rear on a GSXR750J/K

[bruteforce]

As I have an oilcooled 750J/K front end on my TurboGS and would like to upgrade this a little, I was wondering if my 550 based bike is heavier over the front than the original GSXR 750 was. 

I do have a big turbo there but no fairing so it might out-weigh each other

Has anyone measured what the real-life weight distribution (so I mean with oil and some fuel on board) is on a standard GSXR750 J/K?

[sbk replica]

get the scales out marco, put your rear end front wheel up a scale, ask pepijn to do the dame as he has a stock gsxr 750 !

 

turbo and manifold may weigh like 5 tot 7kg depending on materials etc. 

your steel frame might be a little havier and is the placement of the engine the same, this might change things a little.

i know from dismantling my 91 GSXR 750 that the headlight weighs a TON!

but the best way to find out is the scales!

[Del]

22 hours ago, sbk replica said:

 

i know from dismantling my 91 GSXR 750 that the headlight weighs a TON!

 

88/89 750j/k light only weighs 1kg with bulbs

[TLRS]

There's more to suspension then that I'm afraid. Maybe the bike handles are certain way, which could give some direction to what's best to mod.

[Oilyspanner]

From Cycle World 1988 - fully fuelled weight 491 lbs, wt distribution 48.9 : 51.1.

As has been said, wt distribution is one of many factors that affect handling, but if the wt is in the ball park, then the front end should work.  Give the forks a good service, they'll work a lot better - heck, they're 27/28 years old now !

[bruteforce]

9 hours ago, Oilyspanner said:

From Cycle World 1988 - fully fuelled weight 491 lbs, wt distribution 48.9 : 51.1.

As has been said, wt distribution is one of many factors that affect handling, but if the wt is in the ball park, then the front end should work.  Give the forks a good service, they'll work a lot better - heck, they're 27/28 years old now !

So if I'm correct the weight over the front will be about 108,9kg. I'll work from there.

 

Forks aren't in bad shape at all, only the lower fitted adjustment screws are corroded solid. May need to replace them. 

What I am thinking of is buying an upgrade spring/oil kit from WP or other top brand, that is a little more affordable than bringing it to a suspension specialist to have it setup completely customised.

[dupersunc]

Racetech in the States have a really good on line calculator for specing fork springs. http://www.racetech.com/ProductSearch/2/Suzuki/GSX-R750/1988-90

Ok it's for stock bikes but it gives you an Idea. The site is really good for cross referencing spring lengths and diameters too.  I wanted a set of springs for my 750k forks but every specialist I spoke to in the UK  said they couldn't supply them. Not wanting to wait or pay shipping from the states, I did some homework then phoned up Ktech and ordered set of springs for a 1999 zx7r. Arrived next day and fitted perfectly.

[bruteforce]

11 hours ago, dupersunc said:

Racetech in the States have a really good on line calculator for specing fork springs. http://www.racetech.com/ProductSearch/2/Suzuki/GSX-R750/1988-90

Ok it's for stock bikes but it gives you an Idea. The site is really good for cross referencing spring lengths and diameters too.  I wanted a set of springs for my 750k forks but every specialist I spoke to in the UK  said they couldn't supply them. Not wanting to wait or pay shipping from the states, I did some homework then phoned up Ktech and ordered set of springs for a 1999 zx7r. Arrived next day and fitted perfectly.

That's a top tip, thanks!

[Reinhoud]

Weight distribution, is that measured with or without rider?

 

[bruteforce]

Without. I've been thinking about this too, being that on a GSXR the rider is over the handlebars more than on a GS.

[Reinhoud]

That's why I asked.