Question about Suzuki GS 400 E Motorcycles

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Hello, i have a 1980 Suzuki GS 450. i think my timing is off because it will only run with the choke on. if my timing is off how do i set it, and if its on already do you have any ideas about what it could be?

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Your carburetors need a good cleaning. Specifically the slow circuit ( slow jet and passageways ) are plugged with dirt or corrosion. You should take the carbs off, disassemble them, and clean/spray carb cleaner and compressed air through the jets and carb body. If you remove mixture screws , be sure you count the turns and write it down before you remove them so you can put them back in the same positions when you reassemble. Install new spark plugs and spark plug caps and your bike should run like new.

Posted on Aug 01, 2010

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Posted on Jan 02, 2017

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I have a 1980 GS L 450 Suzuki that starts but


Hi and welcome to FixYa,

Almost always, your described problem would be the float needle not closing the inlet seat. This could be caused by a dirt, sand, contaminant, worn needle ends, grooves on the seat. Unfortunately, the only fix would be to pull down the carbs again and redo. Considerations are:
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  • ensure the float height is correctly adjusted;
  • verify float is not punctured with fuel sloshing inside.

Good luck and thank you for using FixYa.

Apr 27, 2009 | 1980 Suzuki Gs 550 L

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