Question about Suzuki GS 750 Motorcycles

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I recently purchased this bike. It starts right up and idles great. However, while riding the motorcycle, it sputters, backfires, hesitates and feels very sluggish when accelerating. just not running 100%. The guy i got it from said he cleaned and tuned the carbs and had no issues prior to me buying it. i've tried so far, new gas and some "HEET" additive to maybe remove any condensation. Any advise would be great!

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Good choice of bike, I have the same!
Is it an early bike with points? If so this could be the problem (I can give you advice on setting them up if needed).
Check the simple things first. Take your plugs out and check their condition and colour. You want to see a biscuit brown colour. Are any wet or sooty? Are they the correct NGKB8ES plugs? Also check the plug caps. Take them off (they unscrew) and check for corrosion. Repace with new ones if they look bad.
Charging issues can also cause problems, so check that the system is healthy. Put a meter accross the battery, with the bike running, slowley increase the revs and check for a voltage increase to around 14volts dc.
These bikes have a bullet proff engine, its often electrical issues that let it down.

Posted on Aug 02, 2010

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Posted on Jan 02, 2017

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Just purchased bike from owner who had the bike stationary for a while. While riding it sputters and jerks. Once I open throttle it moves. it only has 9900 klm and it is in fantastic condition.


Hi The dealership are right but there are ways of dealing with the problem that don't require loads of cash. I had a similar problem with a Suzuki SV some years ago. i researched the problem on the web and spoke to a few bike performance places fuel goes off and causes all manner of problems with fuel injection and carbs.

I cured my problem by get a couple of bottles of injector and carb cleaner for petrol.engines you simply pour it into the tank and ride. I used Comma Petrol Magic (about £6 here in the UK) filled to nearly full tank poured the contents of 1 bottle into the tank and rode around after a few miles and a few small backfires I found the bike was performing much better and idle was nearly normal. I use this product every couple of months (normally ½ a bottle to a full tank) bike rides great. Hope this helps.

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The shop who sold you the exhaust should have given you some indication, but if the bike starts and runs fune and revs clean through the rev range, it may not need rejetting.
hesitation,backfiring,uneven idle, hard start, can all be symptoms of incorrect jetting.
If it is lean, you can sometime diagnose this by using the choke.

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