Question about 2003 Suzuki GSX 750 F (Katana)

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Idles and reves but bogs under load at about half throttle

I cleaned the carbs, replaced the fuel filter, replaced the air filter, changed the oil and synchronized the carbs. the bike idles well and will rev in neutral but bogs under load in all gears.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 23 Answers

SOURCE: GSXR 750 Slingshot wont rev past 5000rpm, with or without choke

I have seen this before a few things to do too make sure. First take the air filter out and shine a light use your fingers to move the slides up and down I suspect the springs that go on the slide is not seated in center you can tell from the slide going halfway and hanging up. Next, the boots on the slides only go on 1 way there is a notch on the carbs for them. I would guess this would fix you up if not we can get deeper into it with air-fuel mix screw settings.good luck

Posted on Mar 25, 2009

MakisRC51
  • 408 Answers

SOURCE: 97 srad no power under 4000 rpm in, in first gear acceleration

If you have installed the Dynojet kit's carburetor needles take them off and use the stock ones.
Dynojet's needles are for track use only and the don't work properly under 4000rpm.

Posted on Jun 15, 2009

ollie reece
  • 1167 Answers

SOURCE: RM85 w/ 105 kit bogs down with rapid throttle onset rate

hi buddy set the needle clip to its normal condition and also on the carb is the mixture screw you need to turn this all the way in and out 1 turns and try this you will always get a bog if you rev fully too quick i had this problem with my kx85 and it was just this hope this helped mate i will send the pic in a mo

Posted on Sep 17, 2009

Testimonial: "Appreciate the help. I've been all over w/ the air mixture screw. Still smokey and bogging down."

  • 1 Answer

SOURCE: 83 suziki GS450 idle issues

the problem with the rubber was close but on the gs450 there is a metal insert that even if the rubber was rotted away the metal seals aginst the head so it cant leak. the problem is on the gs 450 suzuki used a cheap throttle cable that kinks behind the gas tank and kinks at the bend to the crabs under the set and the throttle system is a pull only not a dual cable pull push to always close the throttle. if you start the bike a wiggle the bend in the cable that comes out from the twist grip you will see it changes the idle. with either your finger or a screw driver and push the plate down on the carbs that the cable connects too. if the idle drops this conforms your problem. order a new cable from dennis kirk they have the revised one that has metal adjustment screw and metal clip in. better jacket casing as well.

Posted on Sep 29, 2009

  • 311 Answers

SOURCE: ltz 250 wont idle needs full choke to run.cleaned

hi,sounds to me like the air fuel ratio is all up the ***,locate the air/fuel screw on the carb(normally on the side)screw the screw right in untill it stops,then back the screw out 1.5 turns,this should get the bike to run without the choke,once you have the bike running simply turn the screw in or out untill the bike settles into a nice steady idle,should be good to go,hope this helps...cheers

Posted on Mar 27, 2010

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I have a Troy Bilt trimmer model TB675EC...4 cycle engine. Problem that has arisen is that it dies at high speed and under load. Starts up and runs at idle well.


Fuel starved, carb should have an idle adjustment which sounds like it is fine. Look for the second adjustment

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clean the idler on the intake and also clean the throttle sensor, it would also be best to change the air filter and clean the maf sensor. Idler does more than just idle vehicle it controls low revs, and drop down from reves. throttle sensor tell ecu what air to add to the fuel. and the MAF tells ecu how much air is coming into the intake. also check for broken cracked vacuum lines.

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Hi, Anonymous and the usual suspects are:
1. Extremely lean fuel mixture.
2. Dirt, rust, water, or ethanol sludge in the fuel system.
3. Sticky throttle cables.
4. Multiple carburetors not in synchronization.
5. TPS sensor out of adjustment or faulty.
6. Wrong spark plugs for the type of service.
7. Throttle bodies not in synchronization (FI)
8. Faulty O2 sensor.
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For more information about your issue please click on the blue links below. Good luck and have a wonderful day.
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Hi, Marcus and the usual suspects are:
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4. Float needle and seat sticking.
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For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
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Hi my suzuki gz 125 wont idle correctly and when i rev the engine it just dies down and cuts out i cant even achieve a stable idle speed


I had this problem today with my bike and after much ado I discovered there was oil in the air filter box... check your oil level it could be too full. Mines was and the excess oil was blown into the air filter box and as a result contaminated the air filter. Spent today cleaning the filter box, carb and draining and changing oil, could not get a new air filter today so ran it without onebike runs like new!! New air filter will be here Monday!

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Aug 18, 2012 | Homelite Garden

1 Answer

The bike wont rev up, spits and sputters idles fine. carbs have been cleaned and sinked new plugs and fuel filter.


Hi, Marvin if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will idle and run poorly, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition.
1. If your battery was 2-3 years old when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging remove the leads and let the battery sit for a couple of hours then check the battery voltage with a volt meter, you should have 12.5 volts or better, any readings in the 11 volt range you need to do a proper load test on the battery and replace as necessary, any readings in the 10 volt range you have a dead cell and replace the battery.
4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove your air cleaner and clean and re-oil per Mfg. specifications.
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7. Remove fuel valve and filter disassemble and clean as necessary, remove fuel lines and replace with new ones.
8. Replace spark plug with a new one and check for spark.
For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have a nice day.
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