Rpm at 60mph for a GS750

[tomo]

Just taken the bike out for her first good run after tidying her up a bit following a long time sat in the garage. The bike is a 79 GS750, standard airbox but with a new Delkevic 4 into 1 exhaust. It has been a long time since I last rode it, about 8 years or so, and my ageing brain can`t recall how well it would pull or what rpm when cruising. The Delkevic sounds snarlier than the old Motad I used to have on, but quite like the sound. At 60mph the revs were sat at 4000rpm, but seemed a little high ?. I vaguely remember she used to show 3500rpm at 60 but can`t recall and may be confusing with one of the other old bikes I used to have. She ran ok, smooth enough although felt a bit more "buzzy" than I recall. Just wondered if any one with a similar age 750 can advise ?.

[Nessism]

4000 rpm at 60 mph sounds about right. You might want to count your sprocket teeth and compare against what it says in the factory Suzuki service manual just to be sure.

[Grimly]

Yeah; double that to 120mph and 8000rpm and you'd be right at the top speed (plus a bit for luck and bar bs).

[rphillips]

Back in the day, Old rule of thumb for most 750 thru 1100 bikes 1000rpm. = 15 mph. rarely exact, always pretty close. Don't think it works for Harleys

[1978GS750E]

Thats about where my 78 runs at 60mph. Matter of fact, when I was out yesterday on it, I was thinking about going up 1 tooth on the front to try and eliminate some of the "buzzy-ness" at highway speeds.

[tomo]

Thanks guys, put my mind at ease. Probably always did run at that rpm, just could`nt recall.

[Grimly]

Thanks guys, put my mind at ease. Probably always did run at that rpm, just could`nt recall.

Heh. I always found myself reaching for a sixth gear in the early days. I still occasionally do that, which is the one and only time a working gear indicator might be useful.
Otoh, the thing ran so smooth, on one occasion I covered about ten miles at about 70mph in fourth before realising I had another one to go.

[Rob S.]

...found myself reaching for a sixth gear...

Same here. Gear indicator works, but it's not that blatantly visible. I've never been able to get anyone (here or anywhere) to tell me if it's supposed to be back lit. It's hard enough to see during the day.

[Agemax]

Same here. Gear indicator works, but it's not that blatantly visible. I've never been able to get anyone (here or anywhere) to tell me if it's supposed to be back lit. It's hard enough to see during the day.

Not sure if this wiring diagram is for your exact bike but it says GS1100. There is clearly a lamp next to the gear indicator which says "gear position indicator light", so i am guessing the answer is yes, it should be back lit.

http://members.dslextreme.com/users/bikecliff/images/GS1100wiringdia_.jpg

[Steve]

"Back lit" would depend a bit on what you have. Most of the bikes have individual lights behind a screen that shows the number. Five or six individual lights, one for each gear, plus Neutral. Starting about 1980, the 750s and 1100s had a digital display. I have seen at least two versions of that. One had red LED segments that lit up as necessary, the other one had an LCD display, which is basically black on white. I don't know if that one was lit, but I have a sneaking suspicion that it should be.

.

[1978GS750E]

I put a cheap Chinese LCD display in my 1978 GS750. I think I paid less than $2.00, including shipping off of ebay. A little sanding on the outer case and some glue and it works great! Can be seen even in bright sunlight!

[rphillips]

"78" 750E shouldn't be a problem to see the gear position. Big, bold, bright red numerals on a black background. Was your original indicator not working? I put an after mkt gear position indicator on my "05" Bandit 12, looks a lot like the one on the "77" thru "79" GS750's, same size & color. Love it