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Old 06-22-2010, 12:26 PM   #1
awasson
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1st Gen Japanese Market 750 Specs & Mods

Well, I can hardly believe my eyes but one of my old buddies got the 1st Gen Gixxer Flu and surprised me with an emailed picture of his new purchase. A 1986 or 1987 GSXR750 from Asia.

I haven't seen it in person but I can tell it's not a North American bike because it has the fuel gauge and 1100 looking paint scheme. It doesn't have the NEAS front end like some of them... It has the regular 750 front end. It also has the 29mm flatslides like the Canadian and European bikes.

So I've read all sorts of theories about the various speed reducing efforts the Japanese put into these bikes. Does anyone have some tips on bringing the performance up on these bikes?

I understand there's a limiter wire in the speedo... Any tips on colour and does it just need to be removed and insulated?

Was carb jetting changed for the Japanese bikes?

I'm not even sure about what pipe he has but I understand the Japanese ones were restricted on that as well so maybe a new pipe is in order as well.

Any tips would be great to know... Thanks a lot!
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Old 06-22-2010, 01:34 PM   #2
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Re: 1st Gen Japanese Market 750 Specs & Mods

Would be interested too. I've got myself the 29mm flatslides on my Canadian '87 750 ... and wondering what spedifically to look for about this "limiter"...? Is it something that would have been made to non-Japanese market bikes?

Anyone?
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Old 06-22-2010, 02:32 PM   #3
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Re: 1st Gen Japanese Market 750 Specs & Mods

The limiter is found only on he Japanese domestic market bikes, all it is is a switch in the speedo that cripples the bike to 180kph. Cure if to disconnect the wire running into the back of the speedo and tape it off.
The JDM model that had the 1100 forks with NEAS was the '87 H. If fact the JDM 750H was identical to the 1986 Limited except for the dry clutch. it had all the other goodies that the limited had.
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Old 06-22-2010, 08:16 PM   #4
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Re: 1st Gen Japanese Market 750 Specs & Mods

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The limiter is found only on he Japanese domestic market bikes, all it is is a switch in the speedo that cripples the bike to 180kph. Cure if to disconnect the wire running into the back of the speedo and tape it off.
The JDM model that had the 1100 forks with NEAS was the '87 H. If fact the JDM 750H was identical to the 1986 Limited except for the dry clutch. it had all the other goodies that the limited had.
As well as the speed limiter that is activated from the speedo, the exhaust was the other item that strangled the JDM bikes. If you look at one of the Canadian OEM exhausts, you will see how much larger the outlet is than the Jap OEM exhausts. Unfortunately for the US and some of the EU market, they were also fitted with a restricted outlet on the exhaust.

I have read that in the US, even though the G model 1100 was advertised as having the same 130hp as the ROW markets, when measured they fell well short of what was expected due to the restricted exhaust.

Robinm is correct about the Jap H models having the 1100 forks, but they were still fitted with the 750 wheels and not the wider 1100 wheels that were also standard on the '86 Jap LTD's.

Mike
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Old 06-22-2010, 11:32 PM   #5
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Re: 1st Gen Japanese Market 750 Specs & Mods

Yep first thing you need to do on a Jap Import is buy a new exhaust or take a grinder to the inside of the headers on the original, They weld a huge restrictor in the headers.
All JDM bikes should have the 29mm Flatsides with 97.5 main jets
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Old 06-23-2010, 03:09 AM   #6
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Thumbs up Re: 1st Gen Japanese Market 750 Specs & Mods

Ok first the warning light is just to let u no your doing 95 kmph,thats all it does,disconect it Ive a bad ass exhaust on mine with yoush hedders, low speed jets drilled,,all so if u read below the Jap Import has high Comp to all the rest Some specs for the Japanese domestic model:
Overall length x width x height: 2,120 x 745 x 1,215 mm
Wheel base: 1,455 mm
Seat height: 765 mm
Dry weight: 179 kg
Engine: 4-stroke DOHC 16-valve parallel-4 749cc
Bore x stroke: 70.0 x 48.7mm - compression ratio: 11.0 :1
Maximum power output: 77 hp/ 9,500 rpm
Maximum torque: 6.4 kg-m / 8,000 rpm
Tires: F 110/80-18 R 150/70-18
Recommended retail price: 780,000 Yen (March 1985)
Cheers PeterRTE38
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Old 06-23-2010, 06:35 AM   #7
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Re: 1st Gen Japanese Market 750 Specs & Mods

Wow... that exhaust can looks pretty much unrestricted to me! :-)
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Old 06-23-2010, 06:54 AM   #8
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Re: 1st Gen Japanese Market 750 Specs & Mods

Quote:
Originally Posted by EviLKarL View Post
Yep first thing you need to do on a Jap Import is buy a new exhaust or take a grinder to the inside of the headers on the original, They weld a huge restrictor in the headers.
All JDM bikes should have the 29mm Flatsides with 97.5 main jets
I can confirm the smaller exhaust outlet as I had a mate with a jap 86 model back in the late 80's when I had my 87 H. The H was every so slightly faster, but not by much. When he gutted the STD pipe and put in a straight through baffle in there was no difference in speed between the two. His had no washer restrictors I'm the headers.

This seems to question the claimed 77 hp for the jap bikes. I read an article last month in classic motorcycle mechanics that said that hp rating was purely for politics and in reality there was little difference - bourne out from my experience.....

I've also read of different ignition and cams..... Anyone heard of that before?

I've also read of differences in the ignition and cams but who knows???
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Old 06-23-2010, 06:55 AM   #9
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Re: 1st Gen Japanese Market 750 Specs & Mods

Peter your bike is beautiful!
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Old 06-23-2010, 07:40 AM   #10
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Thumbs up Re: 1st Gen Japanese Market 750 Specs & Mods

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Originally Posted by Richie Rich View Post
Peter your bike is beautiful!
Many thanks 4 that coment Mate,your most welcome,stay up right
Cheers Peter RTE38
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Old 06-23-2010, 07:43 AM   #11
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Thumbs up Re: 1st Gen Japanese Market 750 Specs & Mods

Quote:
Originally Posted by freezehawk View Post
Wow... that exhaust can looks pretty much unrestricted to me! :-)
http://www.youtube.com/user/gunwarm#p/a/u/0/Qz3P-H-fu3M
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Old 06-23-2010, 08:31 AM   #12
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Re: 1st Gen Japanese Market 750 Specs & Mods

nice video on your youtube channel

in fact
compare yoshi before
and monster later
still not so much loud
(but it s really dangerous drive in the wrong side of the street )
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Old 06-23-2010, 08:51 AM   #13
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Thumbs up Re: 1st Gen Japanese Market 750 Specs & Mods

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Originally Posted by ghostrider.1127 View Post
nice video on your youtube channel

in fact
compare yoshi before
and monster later
still not so much loud
(but it s really dangerous drive in the wrong side of the street )
Nothing like a bit of Danger to keep 1 self young LOL
Cheers Peter RTE38 Oooo trust me its loud,ill have to do a new 1
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Old 06-23-2010, 09:48 AM   #14
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Re: 1st Gen Japanese Market 750 Specs & Mods

...
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Old 06-23-2010, 10:22 AM   #15
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Re: 1st Gen Japanese Market 750 Specs & Mods

Not only it looks bad ass, it sounds bad ass too. Nice!

I should quit being lazy and install my pair of cans.

Regards,
Hawk
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Old 06-23-2010, 08:02 PM   #16
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Re: 1st Gen Japanese Market 750 Specs & Mods

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Originally Posted by Richie Rich View Post
This seems to question the claimed 77 hp for the jap bikes. I read an article last month in classic motorcycle mechanics that said that hp rating was purely for politics and in reality there was little difference - bourne out from my experience.....

I've also read of different ignition and cams..... Anyone heard of that before?

I've also read of differences in the ignition and cams but who knows???
The 77hp and 750cc was the max power and capacity allowed for any bike produced for the Jap market at that time. You will notice the power figure is stated at 8,500rpm, and in all probability that is all that they make at those revs, but the Jap bikes still revved to the same red-line as any other GSXR750, so I would imagine that the power at higher revs may have exceeded the allowed 77hp because, motor wise, they are identical to the ROW bikes (except for the US models which were fitted with the CV carbs and the 1100 exhaust can).

Another quirk of the Jap rules at that time was you could 'import' a motorcycle of any power and capacity, so it was common to get the ROW bikes imported back into Japan (1100's etc) to get around the rules.

Mike
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Old 06-23-2010, 10:47 PM   #17
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Re: 1st Gen Japanese Market 750 Specs & Mods

Richie I have measured the cams in the 86 Australian model, the Jap Imports and even the Limited Edition 86 models and their cams are all the same. All stamped 27A with 290 ex/310 in odd lift and the same durations. Ignitions I can't tell you however I am running a Yoshi CDI at the moment and while it has no RPM Limiter in it, everything else seems the same so dare I say the all other CDI's would be the same between these models.
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Old 06-24-2010, 03:00 AM   #18
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Question Re: 1st Gen Japanese Market 750 Specs & Mods

Ok in all my years on here,no 1 has been able to say y the Import has high com to the rest,all so,that has to b in my favour to the low com standed to USA GSXR,s,all so i cant get answers here as to y in Australia
Cheers PeterRTE38
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Old 06-24-2010, 03:06 AM   #19
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Re: 1st Gen Japanese Market 750 Specs & Mods

Quote:
Originally Posted by ozboy View Post
The 77hp and 750cc was the max power and capacity allowed for any bike produced for the Jap market at that time. You will notice the power figure is stated at 8,500rpm, and in all probability that is all that they make at those revs, but the Jap bikes still revved to the same red-line as any other GSXR750, so I would imagine that the power at higher revs may have exceeded the allowed 77hp because, motor wise, they are identical to the ROW bikes (except for the US models which were fitted with the CV carbs and the 1100 exhaust can).

Another quirk of the Jap rules at that time was you could 'import' a motorcycle of any power and capacity, so it was common to get the ROW bikes imported back into Japan (1100's etc) to get around the rules.

Mike
Bingo right on
Another quirk of the Jap rules at that time was you could 'import' a motorcycle of any power and capacity, so it was common to get the ROW bikes imported back into Japan (1100's etc) to get around the rules.
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Old 06-24-2010, 03:19 AM   #20
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Re: 1st Gen Japanese Market 750 Specs & Mods

Pete I don't have an answer for you because I have never measured the pistons and cylinder heads of the Australian and Jap models side by side but I have owned plenty of both models and never noticed any difference between them once the exhausts on the jappers were swapped out.
It is possible the figures are fudged and also just as possible the cylinders or blocks were surfaced on the jappers. I know the Aussie models have plenty, plenty of clearance in the combustion chambers as I went 80 thou (2mm) over in cam lift recently and had no drama with valves and pistons. If the jappers are 11:1 compression then awesome. It's the sort of thing a good builder would do anyway if they are doing a rebuild with half an idea. If you want to confirm it completely Pete, do a compression test on you 1985, that will soon tell you the truth as yours is pretty healthy.
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