Fuel mixture doubts suzuki gsxf750 2006

[ggguilleggg]

Hello,

My bike (suzuki gsxf750 k6) takes a bit more time than normal to lower the rpm to idle speed once I close the throttle. I heard that this could be caused by a weak mixture. I have recently put new spark plugs and they have a thin white dust like in the picture. Do you think I have to adjust the mixture?

Thanks, regards.

[DAZ]

Oooh carb tuning over the interweb  ask 5 people get 7 answers , seriously though plug chops as you are on about are not as reliable as they were due to the ethanol in petrol these days ( thanks you eco-mentalists ) and are usually done after a full throttle flat out run to check main jet sizing . First question is did the bike run ok when you got it ? If yes what has altered? Have the carbs been off ? Have the mixture screws been altered? Does the bike pull cleanly through the rev range? Do all plugs look the same ?

My initial checks would be for air leaks, ( head to carb there's an o ring where the inlet rubber bolts to the head )  , esp if the carbs have been disturbed  try spraying a bit of brake cleaner to see if idle speed changes 

If the bike doesn't pull smoothly at low rpm Up to say 4-4.5k check the pilot jet/mixture screw  after that your into main jet could be a blockage or gummed up if it's sat a good while an the fuel has evaporated and left the crappy  additives to fester ,either way it's carbs off for a clean up .

If it's just one plug that looks lean then you know which carb is to blame 

 

 

[ggguilleggg]

Hello,

I've only checked that plug for the moment. I bought the bike recently and has always behave like this but I did not took it very seriously. The bike behaves good in high and low revs, the idle speed is a bit inestable. I have not touched carburetors on this bike. I'll try that break cleaner trick, thanks. Also I'll check on the air filter, maybe is torn.

 

 

[Gixer1460]

Ignore the air filter as it's pre throttles so can't affect AFR to degree required for diagnosis. Lots of stuff will affect carb running! A good & full service with everything back to stock if bike is basically stock - I trust you have a manual - if not, why not? Get one as they are essential!

[ggguilleggg]

Hello,

I have clean and sycronice the carburetors and now it is working fine. The inside of the carburetors was actually very clean without any obstruction in the jets, so I think that with only the syncronization it would have been fine.

Than you all for the tips.