Hi fella's,

I recently bought a '98 GSXR750. It was built 1/98 making me believe it should be a fuel injected unit? Previous owner bought it a while ago thinking it was injected til he pulled the tank off and had a closer look.

My question is, do you believe this "could" be the original engine, and how can i find out for sure?

The engine seems like a "factory" fitment, no excess wiring etc. But what puts a hindering on my suspicions is that the previous owner also said it came to him with fuel injected stickers on the fairings.

Does anyone have any thoughts or ideas on the best way i can clarify this issue?

thanks all,
Tom

I'm wondering if the engine could be one of the last carbied engines fitted before going injected??

shouldn't the engine id number be matched to the frame vin? i always assumed that 98 on was fi for the 750. maybe at one time someone blew up the fi engine and it was cheaper to swap in a carbed one. you never know. people do silly things lol

thanks for the reply TT750. that was my assumption also. How exactly are the VIN and engine numbers matched up? And where is the engine number located?

I will post up both numbers and the wealth of knowledge on this forum may be able to give me the answer i'm looking for!

ok i just went and had a look over the bike

VIN: JS1GR7DA000510280

But I'm not too sure where the engine number is?

On the right-hand side of the engine, under where SUZUKI is stamped it has 6DF2

and an array of other numbers scattered over the engine such as 1772B and 33EE-1

I hope someone can shed some light on this..

thanks.

Engine number is at the rear of the motor. Should be able to see it in front of the rear shock. Also, spare parts people at a Suzuki dealer should be able to tell you exactly what it is by using your frame number.

ok thanks dude.

Well the engine number is: R726 - 111687

So judging by the prefix it has it must be a 1997 engine. But it could still be the original engine..

cheers all

Ok i just pulled up the seat, and looking at this I'm wondering if its the ECU??

Which would answer alot of questions.

hm. i have a 98 750 and the wiring harness that plugs into my ecu looks much different. what does it say on the title? and on the rear of the gas tank is there a hose comming out?

The engines are not serialized to the frame.

That is the ECU and 32900-33E01 is for the carbed engine, while 32920-33E40 is for the FI engine.

Does this answer your question, no, not really. Anything could have been put in to make it work.

Post a pic of the intake, that is the easiest way to tell if it is carb or FI.

there is a hose coming out. 3 in fact. 2 hoses are just ventiliation hoses and the centre one is blocked off...

I will go and get the numbers on the Unit now...

32900 - 33E01
131008 - 6702
12V NIG076

The engine is carbed, i know that, i want to know if its the original engine...

That is a carbed ECU!
I have never seen a 98 that was not factory fuel injected.
Very unlikely you got a left over with carbs instead of F.I.
More likely you got a bike that had a transplant.
Look for signs that the motor has been removed/replaced.
Take a hard look at the surrounding hardware for marred bolt heads and alike. You should see some evidence of previous work done.
With a carbed motor must also come the accompanying harness. Look for signs of a retro fit there as well.

What's the likelihood that a carby set-up was fitted to an FI engine? For go knows what reasons.

So there is no real definitive way to tell?

I have been over the bike with a fine tooth come, all the wiring is extremely neat, no bolt heads look like they have been tampered with ( hearsay ).

Usually...Someone will install what ever they can find when the old motor goes bad. Carbed in F.I./F.I. in carbed/600 in a 750 and vice versa.
Not much to see from where i am sitting so the question you are asking is quite difficult to answer.
Is it possible carbs were fitted to an F.I motor...YES! More likely though that the entire motor was changed because the previous one went bad.

Does the airbox have the green sensor on the under side?

No green sensor!

Would some photo's help mate? with the tank off..

Well...After changing hands 3 times it appears some work has been done.
If you have yourself a clean/good running srad, the point you seek to prove becomes a moot one. I understand your curiosity though. I'm old school myself and actually PREFER a good running carb set up over F.I. most any day. Easier to diagnose and easier to service if need be.
As long as you have a 750 power plant I would not get too hung up over the original engine issue. I know of folks who purchased 750 srads only to find out they had 600 motors transplanted in them and have looked at several over the years myself. Now THAT would be a bone of contention if ever there was one!

To be honest it doesn't phase me, I love the bike and I think with the future mods I have planned ( cam's etc ) it will be much more user friendly.

It was merely a nagging question in my mind, if it was original or transplant, since the conversion was so well done. I checked on the engine and it has 749 cm3 so it must be the 750 thankfully.

I'm going to do a compression test tomorrow just to confirm there's no issues then look into cam's and a few other things.

cheers for the help SRADIATOR! I appreciate it.

Though I was really of little help, you are quite welcome.
You'll find this site is a wealth of information and others are always willing to share and quick to respond when questions arise.
Become a site member if you can and help support the site that helps support you. As we say around here..." It's the BEST 15.00 a GSXR owner will ever spend!"

I might do just that. thanks again

I sensed that you were "across the pond" from some of the wording in your posts. This may shed a new light on things.
You might have gotten a post production model that slipped out under the radar.
1998 frame with a left over motor. We do see different models overseas and now i am wondering...
Take a look at the knurled ring on the right & left side/lower motor mounts. It's nearly impossible to get those off without marking it up. What do they look like?

Aussie slang is hard to miss...

I will remove the tank tomorrow as I want to degrease and clean the engine and I'll throw a few pictures up here...

Do you have any ideas on where to start?

one of the main reasons I think it could be a transplant is it's done 81,000kms..

I'd look at all the hardware necessary to remove/replace the motor.
It will tell you...especially those knurled rings previously mentioned.
They are difficult to loosen/remove without making some king of marks on them!

I sensed that you were "across the pond" from some of the wording in your posts. This may shed a new light on things.
You might have gotten a post production model that slipped out under the radar.
1998 frame with a left over motor. We do see different models overseas and now i am wondering...
Take a look at the knurled ring on the right & left side/lower motor mounts. It's nearly impossible to get those off without marking it up. What do they look like?

They look like they haven't been touched. No markings what so ever. But as i said I will take some photo's tomorrow, it may give you a better idea of how the bike is set up.

Well...Either someone was quite meticulous with the transplant (a rarity) or you actually got a hybrid post production change.
Strange days indeed mama...strange days indeed!

im goin with engine transplant. especially because that one line off the back of the fuel tank being capped. carbed bikes dont have that from what ive heard. unless its a 96 or 97. does the title say its a 98 750? does the title and vin on the bike match? and this ones a bit of a long shot but is the rear swingarm braced and are the forks usds? 750s had the usds and braced swinger. 600s had conventional forks and unbraced swingers. if anything in here is incorrect feel free to correct me haha

Did he say one line is capped?
If so...then the answer is obvious!

What I would guess to say is that someone did one of two things.
1) Motor swap due to a problem
2) Converted back to carbs as many racers/riders did not enjoy the first gen of FI when it came out.

I would pull the air box off and look at the valve cover for the cam sensor on the top left (closest to the #1 intake) of the cover. If it is there, likely this was a FI motor converted to carbed.

John

Hi John, no cam sensor fitted.

Looks like it is a transplant..

Well...If it works, don't fix it!

Yeah. The capped line makes it pretty obvious.

What part of OZ are you located at? I wanted to find out if mine was a T or V. Went to Mick Hone Suzi in Melbourne and asked, got the answer straight away. That easy.

I'm located in West Oz mate, its good to know another aussie member on the forum.