Old gsx 750 es

[mightysaints]

Hi all

I have resurrected a 30 year old gsx750es. She's great fun to do up. Passed mot with no problems. I do have a rev issue. The bike will only rev up to 8000 rpm and no more in any gear. It starts and ticks over ok

I also have a neta exhaust which I would love to get rid off. Can you still get the old Harris or laser type exhausts and is it true that the oil cooled gsxr exhausts will fit

Can you change the rear end to get a bigger tyre on

[hussey1]

Get some pictures up   I am currently doing up a gsx750es, take a look in the projects section. Not sure on your rev problem but i'm sure someone who knows will be along soon.

It is true the oil cooled gsxr exhausts fit, I fitted a gsxr1100 and bandit 1200 system but both gave me very small ground clearance, so I have fitted a Jama GS850 exhaust which required some fettling. I'm not sure if you can buy the harris/laser exhaust, but think my spares bike may have one on 

I'm sure there is a straight forward rear wheel change. I think I have a gsx1100 wheel which was said to be wider, that came with my spares bike too. 

[bracket]

You can fit a 600 or 750 teapot rear wheel into the gsx swinger you will need the teapot spindle and wheel spacers. I think thats right i was asking similar questions on old forum about my gsx750es. I think it was del that gave me sone advice.

Bracket

[mightysaints]

Here's the bike. Its was a real mess when i got it. I will re spray the body work in the winter and polish up all the ally. Frame is a bit tatty but i aim to clean it up in the winter. Replace the brake hoses and fit K&N's etc. Got shot of the bodywork and center stand to shave some weight of her as shes no lightweight compared to modern bikes.

Took it to work today and still won't rev beyond 8000rpm. Its either the carbs or its electrical. Ran on 3 cylinders on the way to work but was fine on the way home.
Hate the Neta pipe, it has to go and will look out for a GSXR pipe. Now one of the fork seals has blown so a job for a mechanic soon. How much is a good price to charge for fork seal replacement. Thanks for the info above

[mightysaints]

Think I know what my rev problem could be now. I was stuck at the top of a steep hill this morning waiting a while before I could pull out. All was ok with the bike before I got to the top but then it started to run rough and miss a bit at the top. Pulled out onto the road and it played up for a few seconds and then was ok. Going to take the tank off tonight and see if the fuel filter is shot and the fuel pipes may be pinched or damaged. Seams to much of a coincidence its happened twice now whilst waiting on a hill to pull out. May drain the tank out and see what comes out, bet its full of crap as it was standing for a while.

[mightysaints]

Found below on the net,(Sorry its long but is a good reference to my problem) just wondered if anyone agreed with below. If I have not got a fuel problem then can I replace the an aftermarket unit as the Suzi units are a lot of cash and don't work very well

I recently purchased an immaculate 1984 GSX 750es from a dependable Dealer/Importer close by. The Bike is a Japanese Import and is a Very Clean Machine with only 18,000kmh ! Yea I know It sounds a bit Suspect, but Listening to the Engine with Exhaust pipes blocked with a soft cloth tells the truth of the matter….it Purrs ! All original parts still on it and No Grubby "Vice Grip" marks on any part what so ever…. On leaving the Shop it had a new battery, new oil and oil filter, I know cause I done it myself with the Dealer and Brand new Metzeler's front and Back……the usual things like Bulbs, brake Pads, Brake Fluid checked and/or replaced….

On collecting the Bike I decided to take the long way home to get aquatinted with it… Listening out for any Rattles or Hums, anything that could be counted as suspicious.. Nothing what so ever and ,after about 20 miles 30 odd Km/h…nice and warn kept around 4kRPM.Feels Good!, Lets Drive it on then and see how it pulls…… It zipped up to 120Kmh about 75mph and then U can hear it Flooding or Starving . No Power beyond 6000 RPM…… Just Dies ! and u get that "Moaaaaa " effect Happens in every gear ……perfect power delivery all the way to 6000 and SUDDEN DEATH…..

Take Out Plugs ! Completely Black all of them….(Not Oily),, Ok either filter Gone or Chokes Sticking ….Further Check reveals the Air Filter is Disintegrated due to age..

OK Time for A complete checkout…After each step taken the Bike was taken for another Blast

1 Replaced Air-Filter, No Joy

2 Replaced Plugs (tried 2 types "DR8ES and DR8ESL), No Joy

3 Plug Caps Replaced Make NGK TYPE - SP05f (5Kohm) (Old one’s were all different impedance), No Joy

4 Measured Coils OK ,checked wiring loom to CDI OK, No Joy

5 Stripped Carburetors down to individual units… Needless to say Diaphragms were Perfect, Needles Straight, Float pistons free moving spotlessly clean inside . Stripped Chokes …they needed a cleaning all right…… Completely Cleaned and Reassemble with No Spare parts , Carbs Rebalance, No Joy…..

Plugs still black…..

Checked for blocked Orifices from Airbox to carb and from carb to Head Ports…nothing…..

Strip Check Clean and Balance Carbs again…..Same Result…Black plugs …

PLEASE PLEASE PLEASE TELL ME I AM DOING SOMETHING WRONG

Genuine Suzuki "Cylindrical type Foam Air Filter" should I try something else ? Are these BIKES restricted ? I don’t think so.. then Again? Are there any Sneaky Restricting Washers in the Engine or Exhaust ? Do I need to change the jets ?

Any Information or help in this area would be much appreciated and it would help keep a perfectly sane Human Being away from a Shrink !

RIDER: Owen Coughlan

REPLY: Ken Taaffe
I have run into the same problem with my 84 GS550ES, and believe it or not, it has nothing to do with your fuel system. It is the infamous GS electrical system. I did the same replacements and checks as you. I ended up replacing the signal generator ($125) and ignition module ($300).

You may want to try with just the signal generator first. Since it is RPM dependent, that is your best bet. I had to replace the ignition module also (I also wasn't getting enough spark), but you should hold off on that unless really necessary. My bike runs great now.
REPLY: Mike Saxon
Wow, sounds like you put a lot of effort into troubleshooting your problem! I don't think you have a fuel problem, though, especially since you cleaned and adjusted the carbs twice. I'm wondering if you've got bad coils or a bad ignitor. Do the test for the ignitor and see what obtains.