Bike wont Stay running

slaine27

HI, Hope someone can help.

I have a 1984 Suzuki GSX 750 EF, its been sitting up for quite sometime, but was running before that, without any issue.

I give it some choke, press the starter button and the starter tries away to start the bike but it just wont turn over, I replaced the plugs, cleaned the carbs, charged the life out of the battery and tried again,

by pure accident, i had my fingers in one of the carbs and when i blocked the air flow and created suction the engine turned over and came to life, gave it full revs and was sweet but unless i keep covering the carb/s it wont stay running, it cuts out.

anyone any ideas ?

daenerysstormborn3

If there is a little tube sticking out of where you cover the carb it needs a little rubber thing on it, did the little rubber thing pop off maybe?

galwaytt

slaine27 wrote: »

HI, Hope someone can help.

I have a 1984 Suzuki GSX 750 EF, its been sitting up for quite sometime, but was running before that, without any issue.

I give it some choke, press the starter button and the starter tries away to start the bike but it just wont turn over, I replaced the plugs, cleaned the carbs, charged the life out of the battery and tried again,

by pure accident, i had my fingers in one of the carbs and when i blocked the air flow and created suction the engine turned over and came to life, gave it full revs and was sweet but unless i keep covering the carb/s it wont stay running, it cuts out.

anyone any ideas ?

If blocking the main airway actually helps,then I'd wager what's happening is that you are 'forcing' air through the pilot/low speed circuit, and the bike fires up, so they're working. But, once you allow air through the main body, something's not right, and I'd say basically you've got fuel starvation.

This could be because your carbs need re-examining, or, if they're diaphragm carbs, maybe they've dried out and/or split.

I've been down thus road with a GSX,years ago, and I lost count of how many times I had them off to cure a similar fuel issue.

Actually, just noticed, my troublesome GSX400F was a 1984 as well !

slaine27

pixiebean22 wrote: »

If there is a little tube sticking out of where you cover the carb it needs a little rubber thing on it, did the little rubber thing pop off maybe?

not sure where you mean, there isnt any tube coming from the carb except the air and fuel. The only other tube i see is a air bleed opposite the fuel on the petrol tank,

slaine27

galwaytt wrote: »

If blocking the main airway actually helps,then I'd wager what's happening is that you are 'forcing' air through the pilot/low speed circuit, and the bike fires up, so they're working. But, once you allow air through the main body, something's not right, and I'd say basically you've got fuel starvation.

This could be because your carbs need re-examining, or, if they're diaphragm carbs, maybe they've dried out and/or split.

I've been down thus road with a GSX,years ago, and I lost count of how many times I had them off to cure a similar fuel issue.

Actually, just noticed, my troublesome GSX400F was a 1984 as well !

guess ill have to look at my carbs again, fuel is getting into them for sure and the rubber seemed fine, but ill check again,

thanks for the help, ill give it a try and we'll see.

Hotblack Desiato

Not turning over would mean nothing happening when you hit the starter. It was turning over, just not firing!

slaine27

ninja900 wrote: »

Not turning over would mean nothing happening when you hit the starter. It was turning over, just not firing!

oops ah yes indeed, thanks