[1994 gsxr750 86mph tops]

6 hours ago, Gixer1460 said:

Seems too repeatable / exact to be fuel related as load will vary due to rpm / gearing which determines fuel flow? I'd still plump for something electrical - but don't know what as all the usual suspects have been replaced - assuming they've been sourced from 'normally running bikes' to eliminate a 'like for like' problem swap?

I totally agree.

We have tried different carbs, different clocks and ECUs . The ECU that was on it had rounded plugs with seals.

  It now has a different loom with the older looking ECU and squared plugs with no seals. That didn't make a difference until we managed to get a gear selector switch. Fitted the switch and took it for a run. Power felt the same even after 86mph. It did feel like it was going to hold back at all. Sadly the bump obviously dislodged something and it dropped back to 86mph.

So I'm thinking the gear selector is making the difference.  

[1994 gsxr750 86mph tops]

6 hours ago, george 1100 said:

Theoretically, that bike should be able to do that in second gear.

Is this happening in top gear or any gear?

Maybe a fuel supply issue? Take the tank off, suck on the vaccum with a syringe and check flow.

Does it redline in first?

Does it feel like it has full power up until 90mph?

Fuel flow is good, I did check the breather pipe and ran it with the cap undone .  Straight up to redline in first. It was pulling hard until it hit the bump then went back to only doing 86 mph.  Doesn't matter what gear your in, it will pull strong until 86mph. 

[1994 gsxr750 86mph tops]

Hi all. Not had chance to do a video.

But here's an update.

After lots of messing around. The bike now has different carbs ( with out the tps ),

A different loom and a different CDI. 

There was no fittings for a speed sensor before and still isn't.

The clocks have been changed

The bike still wouldn't pass 86mph.

The latest thing was to pinch a  gear selector switch of another engine.

 there was a difference.  It was pulling strong untill he hit a slight  bump and it dropped back down to 86. He got just over 90mph

 

So the only thing that's made any difference was adding the gear selector switch

 

[1994 gsxr750 86mph tops]

1 hour ago, gazza49 said:

here is a bit of information on how to deristict the gsxr 400,as they have used m-max boxes as well to fool the cdi thinking its still in a low gear when in 5th and 6th.-But they are easily overcome by soldering a 1.5k Ohm 1/2 watt resistor in line with the green/yellow wire to ground which is what you could probably could do to yours to get it revving in 5th and 6th again. The resistor is a mod that owners use to lose the speed restriction from the poxy gear selector switch that Suzuki put on the bike to make it Jap legal. (put the 1.5k resistor inline with the green/yellow wire from the cdi to ground )

I'm hoping to go over tomorrow to have a look at it and see about soldering a resistor in.

As far as know though, it doesn't have the gear selector switch. Just neutral .  No speed sensor on the drive sprocket just a cable speedometer. He's tried a few speedos and it didn't make any difference . 

But thanks for the info. 

[1994 gsxr750 86mph tops]

3 hours ago, Gixer1460 said:

That would explain why it wasn't 'visible' at UK or European sources! Even so, it should be 'full power' unless the emission restrictions extend into the CDI's as well? This is really getting strange as its acting like the Jap market bikes with restriction based on speed but 86 mph is too low, they are restricted to 112mph I believe?, all done within the speedo - needle passes sensor and ignition cut occurs.  This bitsa is turning into an enigma!

Just so you know, i copied and pasted the numbers and the number 1 was added some how. 

He has changed the clocks to see if that made a difference. No change. This gsxr also has tps. Should it have a speed sensor as well .

I'm popping over next week if I get chance ( I'm stripping my gsxr11). I'm going to video the cdi and loom and TPS and anything else I can think of. It's easier than typing

[1994 gsxr750 86mph tops]

5 hours ago, TxGsRider said:

32900-17E201 is listed as an igniter Unit 88-91 gsxr 750 California Only per Partzilla

Oh dear. I copied and pasted the numbers but not sure where the 1 at the end came from.

I just searched again minus the 1 and this is what I found.

https://www.google.co.uk/search?q=131800-5680+gsxr750&sca_esv=d37586a3b186efe8&sca_upv=1&biw=432&bih=810&ei=Pkk1Zv_6AZGshbIP0qis8Aw&oq=131800-5680+gsxr750&gs_lp=EhNtb2JpbGUtZ3dzLXdpei1zZXJwIhMxMzE4MDAtNTY4MCBnc3hyNzUwMggQABiABBiiBDIIEAAYgAQYogRI8R9QlxtYlxtwAHgAkAEAmAFRoAGRAaoBATK4AQPIAQD4AQGYAgGgAleYAwCIBgGSBwExoAe_Aw&sclient=mobile-gws-wiz-serp

 

5 hours ago, TxGsRider said:

32900-17E201 is listed as an igniter Unit 88-91 gsxr 750 California Only per Partzilla

 

[1994 gsxr750 86mph tops]

2 hours ago, Gixer1460 said:

Easy enough to check a part number against what is supposed to be fitted on somewhere like Robinson Foundry or CMSNL ? (providing the part # tag is still legible!)

 

32900-17E201 31800-5680 

This is what's on the bike. But I'm struggling to find it any where apart from a repair site. 

When I search for the 1994 cdi I get a different one. 

32900-17E00 131800 5661 

He's having a break from it at the moment, it's doing his head in. 

[1994 gsxr750 86mph tops]

2 hours ago, bunk said:

Is there any way to figure out its intended market? Its obviously restricted wit that box put on it.

We are trying to get some history on it. I have a feeling it was a bit of a project that someone couldn't get sorted before my mate acquired it.  I'm convinced it has the wrong cdi 

[1994 gsxr750 86mph tops]

On 5/1/2024 at 2:12 AM, Dezza said:

Is the bike an import intended for the Swiss market? They used to be castrated in the factory. Look in any genuine owner's manual and you'll see the power output for models intended for Switzerland to be about half what they should be. However, even with half power it should still go a lot faster than 86 mph

It's not an import. And it's like a missile up to 86 then it's like he stopped turning the throttle.  We're going to look at fitting a speed sensor. If that doesn't work we will get a loom and cdi of a 94 gsxr750

[1994 gsxr750 86mph tops]

5 hours ago, TonyGee said:

not in the exhaust in the inlet rubbers.  the reason why i said is ive fitted some restriction washers to other bikes is, a 600 bandit rev's and rides just exactly the same BUT when it reaches around 80-85 mph it won't go any faster. 

Sorry . I was walking the dog when I read your post and I misread it . 

[1994 gsxr750 86mph tops]

1 hour ago, TonyGee said:

not in the exhaust in the inlet rubbers.  the reason why i said is ive fitted some restriction washers to other bikes is, a 600 bandit rev's and rides just exactly the same BUT when it reaches around 80-85 mph it won't go any faster. 

Cheers. I will get him to look. 

[1994 gsxr750 86mph tops]

Cheers guys. The m max it seems is a derestriction device. There's no washers in exhaust. He redlined it in first. He said it revs as it should but the revs stop slightly lower in each gear at 86mph.  He said it's like he just stops turning the throttle when he gets to 86

[1994 gsxr750 86mph tops]

Hi guys/ladies

Hopefuly I'm posting this in the right place.

My mate has acquired a 94 gsxr750. Starts great, ticks over great, handles great and flies straight up to 86mph great. 

Problem is it won't go past 86mph. It's not restricted on the revs or power output. 

I've had a look myself and this is what I can tell you. Please bare in mind I'm not to hot with technical stuff.

It has tps, it has a cable speedo ( THERES NO ELECTRONIC SPEED SENSOR). I was told it had kph clocks originally. It has what I think to be a cdi and loom off a 96 onwards gsxr750. 

I have searched the net and here and I couldn't find a 94 gsxr with TPS and the 94 cdi or ECU has different plug fittings.

I will pop a photo of the cdi and m max thingy that I found under the seat. 

I will also add photos of what I think should be on there.

My final thoughts is the loom and cdi have been replaced and it's playing up because there's no speed sensor.

It's probably something really stupid that's staring me in the eye.

Ide like to thank you all in advance . 

 

[Awesome Oilcooled Pics]

[Slabside 11 mixture screws]

On 1/3/2024 at 10:26 AM, Duckndive said:

Are all the springs the same length ?

Yes.  I'm going to take the carbs off probably next week to measure up a new filter cover and give them a clean.  I'm out tomorrow night, if it's not raining I will reset the screws with the engine running. Not something I can do at home with a straight through pipe

[Awesome Oilcooled Pics]

[1052 cam chain adjuster spring]

Cheers guys. I will keep my eyes open for a 1200 bandit one

[Awesome Oilcooled Pics]

[Awesome Oilcooled Pics]

[1052 cam chain adjuster spring]

Hi. I've been trying to locate a spring for the cam chain adjuster on my gsxr1100 slabside.

I can't seem to find one any where.  I don't really want to go down the manual route.  I wondered if there was any other options like one off another model 

Thanks 

[Slabside 11 mixture screws]

6 minutes ago, Swiss Toni said:

As Tony says, just screw them in until they just seat. No more. Then back out as required. The probable reason for yours differing in the amount of protrusion into the inlet tract, is maybe the po was a bit heavy handed with the screwdriver bottoming them out, so slightly enlarging the hole, thus the differing levels of … penetration. 

I would imagine it was me that was heavy handed. I will be more careful in future. I was hoping it was something else like the way it was drilled or something. 

[Slabside 11 mixture screws]

In this amazing peice of art. I show an idea of where the needles are when screwed in.

When I screw them out equally #1,2&4 can't be seen. But #3 is just visible. 

 

[Slabside 11 mixture screws]

3 minutes ago, TonyGee said:

the general rule is to screw them all the way in JUST till they stop, don't over do it, then set them all to the desired turns out equally to start with.  

Hi Tony gee. That is what I usually do.  I normally do it while there on the bike. But I can't get a very smooth tick over and it gets worse when the engine warms up. 

I have synced the carbs. 

I'm tempted to take the bike up the layby and try adjusting until they sound even.  But Im just curious if the drillings are different and how much effect it has.

I will take some photos over the weekend if the weather holds. Im having to work out the front at the moment

[Slabside 11 mixture screws]

Hope this is the right place to ask.

When I screw the mixture screws in I've noticed that I can just feel the tip of the #1 screw inside the carb.

#2 #4 protrudes a bit further ( 1 extra turn in  ) and 

#3 sticks out quite a bit ( can't remember off my head but it was around 2 extra turns from flush )

I've measured and examined the screws and there identical to each other.  

I've got the same issue on my RF.

So I'm wondering. If I screw them all the way in then 2 turns out. Are the mixture screws going to be set wrong.

I am trying to find pictures to better explain.

Thank you

[Awesome Oilcooled Pics]