Question about Suzuki B-king Motorcycles

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Got regulator rectifier fitted last year Also fitted new plugs BIKE BEEN SITTING IN GARAGE Most of winter with optimate on but now it is running rough at low speed then picks up very abruptly Fine on

Could it be the Plugs or a Coil

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Clean the Carburetor. Next winter store the bike with some fuel conditioner.

Posted on May 14, 2014


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Posted on Jan 02, 2017

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SOURCE: kawasaki gpz 1000 rx 1987 model

Running well at high revs would indicate that all the fuel and air it needs are getting to the engine and you also have a good spark. Probably no problem with air and fuel filter ( if fitted) or sparkplugs.

Running hot, and bad idling are signs of a lean air fuel mixture. The engine is probably not getting enough fuel at low revs.

This could be caused by an air leak between the carburettors and the engine. Check that the vacuum line to the fuel tap is properly secured at both ends. It is behind the fuel line at the tap.

Get a a short length of hollow plastic tube and use it like a stethascope - put one end to your ear and move the other end around your carburettor mounts with your engine revs as low as you can get, and listen for any sucking noises that would indicate a leak. Look for cracks in the rubber inlets.

The other possibility is that there is an internal blockage in the idling jets or idling fuel circuit. This is where dirt tends to lodge because the jet dimensions and passageways are very fine - The high speed jets are much bigger and dirt often just passes straight through.

Try a little bit of choke while the engine is warm to see if you get a stronger low speed response. If so that would point to an internal blockage.

Posted on Mar 21, 2009

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SOURCE: will only run with full choke and absolutely no throttle.

Carbs gummed up. Need a serious cleaning or a full ruubers replacement/rebuild kit. Gas turns to gummy when left stting in the fuel bowls.

Use a couple of cans of Sea Foam.. best stuff in the world.

Posted on Mar 20, 2009

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SOURCE: misfiring at speed on gilera 200 scooter

This sounds more like a lean fuel condition than ignition. If it was stored over the winter without the gas being drained or a fuel stabilizer being added, you'll likely have varnish build-up in the fuel system that is not allowing sufficient fuel flow.  If your engine is fuel injected, it's likely your injector is partially clogged.  If it's carbureted, your carb jets may be partially clogged or your carb float may be sticking and not allowing the needle valve to fully open.  Fill the gas tank with fresh gasoline, but leave enough room for a can of Sea Foam.  The Sea Foam may be able to break up the deposits and allow fuel to flow again.  However, there's no guarantee and the fuel system may have to be disassembled to be cleaned.

Posted on May 05, 2009

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SOURCE: suzuki 1200 bandit 1997 running rough at low revs

i had a similar problem on a suzuki gs250t custom, my bike would not start some times and if did start, would run erratically, and cut out, this was after i changed the spark plugs, found out that the supplier gave me the incorrect graded plugs.

Posted on Jun 11, 2009

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SOURCE: 2001 FXST will only start with full choke, dies

sounds like your main jet is clogged you will need to take carb off and clean the jets out run a peice of a wire wheel through the jet to ensure they are clear you also need to clean your float needle valve to ensure that it is getting enough fuel

Posted on Jul 06, 2009

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I just put a brand new battey in my 95 katana but it still.loses power and dies and wont start

Sounds like your regulator/rectifier has failed. This is a fairly common fault on GS and GSX models, particularly the smaller capacity (below 750cc) models. Did the oil level fall below minimum at any time, because this can cause the generator on some models to overheat, causing a power surge which can burn out the regulator. Get the generator checked and fit a new regulator/rectifier.

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I cant get my 2005 aprilia rs125 to start when i press the button i just get a click ive charged the new battery ive got. any ideas

You need 3 things for it to start: Compression, fuel and spark.

1. First and easiest thing to check for is spark. Pull one plug and connect the lead to the top. Rest the plug against the head to ground it. In your garage (or somewhere where it is somewhat dark) turn on the ignition and crank it for a few seconds while looking at the plug. You should see a bright blue spark.

2. If that checks out, and you can get a hold of a compression tester check that. We can probably assume you have sufficient compression in at least a couple of cylinders.

3. Next is gas. If it has been sitting for some time, (A) the carb passages could be gummed up. Or (B) the petcock screen could be plugged, not allowing fuel to reach the carbs. This happens to my bike about once a year. Or the floats could be out of adjustment, unlikely. With the petcock in the on position, open one of the drain screws on one of the carbs to be sure fuel is reaching them.

One last possibility is that your rectifier has gone bad. when was the last time you rode the bike?

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I just took my ducati out of its winter garage, when i parked the bike there 4 months ago it was all fine, but today when I started it first time this year the engine did not run well. after 30 minutes...

hello rob. often when there is oil in the air filter it is an indication that the machine was turned on it's side. that said, replace the air filter and the spark plug[s]. Also remove any old fuel and replace it with brand new fuel, not fuel that has been sitting around.

finally if it is still rough running go to the auto parts store and get a bottle of a product called seafoam, a fuel additive that cleans the internal parts of the engine remarkably well.

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Replaced dead battery. new one went dead. guess something wrong with charging system. don't know what to look for

hi, looks like u may have a faulty rectifier, did the battery go flat when u wer using the bike or when it was standing? locate the regulator rectifier,under the rear mudguard in front of the rear wheel, on this you will have a plug in connector check all conections for corrosion clean if ness, see the vidio, click on linkhope this helps paul

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I have purchased a 1991 750 ninja it will not run unless it is attached to jumper cables to my truck. does this mean that i have a bad stater or regulator? also what bike parts are interchangable with that...

Your bike will not run without a battery, Get a new battery in there, and make sure your alternator is working to keep it charged. If the alternator is bad, a new battery will only run the bike for maybe 1 hour before it dies. You might go a couple years either direction for parts to fit. Even body parts might fit. Hope this helps.

May 03, 2010 | 1990 kawasaki ZXR 750

1 Answer

Leaking battery

Yuasa batteries are expensive but with good reason. They are extremely high quality and follow the old adage 'you get what you pay for'.
Cheap batteries appear initial good 'value' but the extra investment will pay dividends long-term, if properly maintained, your Yuasa will last many years.

If you suspect the liquid is acid, neutralize it with some baking soda just to be sure. You don't want that dripping onto anything metal or pain, causing damage.
Once you have it neutralized, wash it out with water.

It sounds like you ride infrequently and bike may have periods of serveral weeks on occasion without being ridden.

My recommendation would be to install a quality replacement (like the OEM Yuasa) then purchase a battery maintainer that you can plug in while bike is not being used. Good maintainers are Optimate and Battery Tender. (I have both myself - I really like the Optimate 4.) Both of these come with a waterproof 'pigtail' harness that you can permanently connect to the battery - then when you put the bike away, you can simply connect up to it without having to remove anything.

Hope this is helpful.

Good Luck!!

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Charging problems on my 1983 Suzuki GR650 tempter

The only easy way is for you to buy the service manual - it is pretty hard to tell you how to service your regulator if you don't know what it is...
And it is - or at least something in the charging circuit.
Early Suzukis had consistent charging problems, resulting in run-down batteries, short battery life, hard starting and frequent stator and regulator/rectifier replacement. Some of the problem is due to poor quantity or corroded electrical connectors, some to a poor ground to the regulator/rectifier and some just poor quality components or design. Keeping the connectors on the three stator wires clean and by running a heavy ground wire directly from the negative terminal of the battery to the regulator/rectifier mounting bolt will help.
You can download the GR650 manual here - just look for the tiny "Save file to your PC: click here" at the bottom right of the page.

Jul 01, 2009 | 1983 Suzuki Tempter GR 650

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Battery light on and firing on three cylinders

ah the old 5G2 nice bike.

if sat around for a year the battery will be shot, so it will not take a charge or hold it, that may be why the warning light.

after a year idle the carb jets will gunge up,

might you have no spark because the battery is so flat?

a year laid up... why.? did it have a fault then? carb diaphragms don't like being laid up, nor carb slides, one may be stuck in the old petrol residue.

think I'd be tempted to try a new battery, and if not charging, the regulator probably packed up, beware though, a shot regulator can feed ac through to the battery rather than DC, and it will bust your new battery. loads of people fall for that one.

May 09, 2009 | 1983 Yamaha XJ 650

1 Answer

No rear brake master cyl.full

If it has been sitting on the sidestand, the cylinders on the low side occasionally become fouled - which will clear up pretty fast or after changing the plugs. There is probably gunk in the rear caliper from sitting & dealer may want to check the fronts as well. Dealers are really expensive & I would guess that they would want $250 or so just to fix the rear brake issue. When i needed all my calipers cleaned, my dealer wanted almost $1000., so I did them myselves for about $50. Rick

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1 Answer

Battery not charging

it will either be a stator problem or your regulator rectifier has gone down , id say most likely to be the regulator rectifier ., not really a good way to test these with a meter its just a case of check what readings you are getting from the stator if they are ok fit a new regulator ,your regulator is a square peice of metal with lots of cooling fins on it , here is a idea of what it will look like as this one is on ebay im unsure if it is the right one for your exact bike as i dont know year and model code etc , but should give you a idea what your looking for .

hope this helps ,
kind regards

Mar 18, 2009 | 1990 kawasaki ZXR 750

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