Gs 750 engine/ fuel problem

[Guest]

Hi I have 2 question,first one is that I have just got the bike Suzuki gs 750 1977,rode it for 5 miles no problem then it sound like it had run out of petrol switch to reserve,still died left for five mins started rode about 1/2 mile same again left for a while started etc etc.
2 question starter does not turn engine took starter out worked ok put back I did not turn engine over motor got hot......?.

[tom203]

Sounds like you have two issues . Bad petcock, or no vacuum applied to it,so no fuel flows... did you try "PR" position?

weak and/ or dead battery... Probably not getting charged, so it can't turn over starter

[Grahamp]

Hi tom thanks for your replied,if I leave it on pr would it work just like leaving it on run where is the vacuum from ? Took the starter out connected to batterie start motor run fast?if there any more advise tom would be grateful!!

[hannibal]

When the petcock is on run or res, fuel should only flow when vacuum is applied. When it's on pri, fuel flows all the time.

The vacuum line should go to the port on carb #3.

[allojohn]

Is there any petrol in the tank? Had to ask......
And, welcome to the forum.

[Grahamp]

Is there any petrol in the tank? Had to ask......
And, welcome to the forum.

thank you
Yes, when the bike stopped it was like it had run out of petrol.put it on reserve and wait .forgot to mentions the bike will tick over all the time it's only when you ride I get this problem.
Graham

[allojohn]

So the pilot circuit is OK, but when you need more gas......nothing.
Are you in contact the previous owner? How recently was it running well. Any maintenance history?
It could be cr@p in the tank, in the petcock and in the carbs.
You will need to inspect each to rule out issues/start fixing.......

Edit: Also confirm the vacuum hose is on the #3 carb nipple as Jordan noted.

[hampshirehog]

Try running it on prime as Tom suggested. If it works ok it's your petrol tap. Don't leave it on prime when you park it up or you'll run the risk of dropping petrol all over the ground.

Starter motor could be worn brushes, dirty armature, poor earth, jammed mechanism etc. I'm only just up the road from you if you need help.

[Grahamp]

I will check that allojohn thank you.

[Grahamp]

Hi hampshirehog thanks for the info,I only bought the bike Sunday,I will take it out for a ride tomorrow .thanks for the offer might take you up on that? If I wanted to get it serviced and tune where the best place to take.
Thank you graham

[hampshirehog]

Just sent you a PM Graham.

[mrbill5491]

Do you have an inline filter on it? if so, take it off.

[Grahamp]

Hi mr bill it does have a filter on need to get a longer fuel pipe if I take the filter of