Katana Owners Club U.K.

Hi all!
Does anyone know how the Jap model was restricted to 77hp? And more importantly.... how can it be undone
Thanks!

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I assume you are referring to the late model 1100, if so not sure of the actual BHP figure but they were restricted in the exhaust and CDI which isn't as the original CDI but a black box. I suspect the timing is different and the jetting to suit different power lay down.

Is it worth the hassle for an extra 20 horses that are hiding somewhere inside ? You still have to deal with the speed ristrictor at 112 mph ......if you think you need these extra BHP. You must also need the extra mph!

Sorry Fossie, i thought i had posted it in the Pop up section?!
My 750 is one of the restricted models. 77bhp instead of 90bph. Just wondering if anyone else has found their way around the restrictors

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Ah in that case the restrictor is in cam timing and cam profiles , and carb jetting the difference is 7 BHP in real terms ...... The back wheel on Aussie model is 18" so if you take readings at back wheel as they do and not crank so rear reading is 84 not 90 BHP.
"
Easy to do just get a set of European cams of a 750 esd and reset cam timing and carb jets.

I have 1 of each model tour 2 up with them , the difference is ...........is there?

Oh and by the way yes you do post it correct area.......Iam at fault for ....well most things really!

Resetting the timing by way of power commander? Thanks for the info Fossie.
Do you know if the intake rubbers or Exhaust is also restricted?
I was thinking as a winter project i might see if i can get a few more hp out of her....
Or maybe i just lose weight? Then she will go faster!

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Resetting the timing is just a case of advance or retarding the pick up plate . The CDI on these is so way before power commander remapping , it is just a set of electronic points.

There is no restrictor so in the inlets or carb outlets.
It is all simply a GSX 750es normal set up , just reprofiled cams.
An aftermarket exhaust may well have released some ponies anyway.....or restrained them if the carbs are not correctly jetted to suit it. Best find a dyno to see where you are at to start with, I mean you spend weeks searching and fitting only to end up with what you started with

How do you know your bike is a restricted model?..maybe it has had an Es engine fitted in the 30 Years Maybe it is a full power bike with a replacement set of clocks that make it look jap market,, does the 80 Kms warning light come on? If not has it been disconnected OR ...Not possible to connect it as the wire from the loom to clocks never supplied ...as per Southern Hemisphere model?

So says the soothsayer

The frame number tells me that it was originally a restricted model and i have the dreaded 80kph light! But i have no idea if the engine is original...
I would have thought it would have a bit more get up and go if it was unrestricted?! It is pretty tame on the acceleration. Is there any way the engine number would reveal any info?

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The frame would just tell you it is a GSX 750sE as the frames are not built for a specific market, however for some marketing reasons some bikes came with GR71D the rest were GR72A.

I can check the engine numbers tomorrow but the fuller power pop up engine is R703.

Ok, i thought the GR72A was the Jap model and the GR71D was the export? My engine is also a R703?

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Just been to check and all 3 of my engines are prefix R703 so no help there...however the lower power is-703 127etc all full fat is 701-126 etc, this may be helpful.......
Though it is best to remember as said that the real figure you are unleashing is 84 ...the 90 was never stated in any Suzuki literature in any market officially.

GR71 D was export to Australia etc but with the advent and time and grey markets everything is mixed up now. We always have had both frame prefix here in UK from the first day of there import by Heron in 1985-.
But after 1992 when grey imports came in we got more GR72A s .
So a bike that came from Singapore who didn't get it officially anyway , then in to Hungary possibly via UK or Eire must have an interesting history.

Just to compare , we did a project as a club a few years ago and built one from parts, it ended up in as a raffle prize and is now in Germany. It is a GR72A jap model, the clocks are obviously from another. But the engine is from a UK ES With a recon'd head etc so is as full power is it can be, but on paper is just a lowly 77 BHP........if only the German authorities knew