Question about 1993 Yamaha YZF 750 R

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When i went to start my bike it popped and a small cloud of smoke came from engine now it seem to **** air and not get enough fuel

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Check the accelerator cable that is connected to the carburator , then check the carburator the problem is in the carburator.

Posted on Jul 18, 2009

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I have a BMW R1200GSA - 2016 model - 2000 klm on the clock i Start up the bike and i have a huge cloud of smoke coming out the exhust. Dealers cant advise what is wrong nor diagnose the problem.

Hi, Denis if you take your bike to a dealer for a specific issue that costs outrageous amounts of money only to have the same problem 2 days later your situation is not unique unfortunately and it is a double edged sword. First, you suffer the emotional stress and frustration of spending all your hard earned "Drachma" and your bike does not get fixed. Second, comes the realization that not only are the technicians incompetent but also the service manager for not doing anything about it, this isn't rocket science, it's a glorified lawn mower engine with extra cylinders and carburetors sometimes. You need to put an end to all the double talk, dancing around the issue, and a "we don't care" attitude, but how you ask, very simple you exercise the "nuclear option" go back to the dealer and ask to speak to the owner or general manager if the owner is not there, then with a straight face and polite voice you ask him/her if they can provide you with the name and contact phone number of the person at your brand motorcycle headquarters in your country that can recommend a repair facility that will fix your bike because your local dealer either can not or will not. I guarantee you that is all the grease you need to get someone to light a fire under the proper persons rear end to resolve your issue "toot sweet" Your instrument gauges and lights can alert you to most electrical and engine issues they can not warn you about failed engine gaskets or seals so your engine has to resort to old fashion alert methods of colored "SMOKE SIGNALS" here is a breakdown of their meaning:
1. COLORLESS OR SLIGHTLY BLUE SMOKE on start-up means your air/fuel mixture is at the right composition and everything is well burnt in your combustion chamber.
2. BLUE SMOKE on start-up is usually caused by failed valve seals dripping oil into the combustion chamber when the engine is not running.
3. YELLOW OR BROWNISH SMOKE at start-up means your air/fuel mixture is too lean. Too lean means that there is low fuel but high air mixture in your combustion chamber.
4. WHITE SMOKE on start-up may be caused by a blown head gasket allowing coolant to enter the combustion chamber and may start dripping out of the exhaust pipes or mufflers. Smoke while riding is usually caused by worn out or damaged valves, seals, guides, pistons, rings, or cylinder walls.
5. BLACK SMOKE on start-up is usually caused by too much fuel in the combustion chamber this can be due to air/fuel mixture adjustment too rich, accelerator pump improperly adjusted, faulty choke/enrichner or not in the off position, air filter dirty and clogged, faulty carburetor float needle and seat, pilot jet too large, fuel injectors leaking, smoke while riding is usually caused by the main jet being too large or a damaged carburetor.
It should be noted that aggressive or abnormal throttle operation will cause these conditions to manifest themselves exponentially.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Burning oil when start up R1200GS
White smoke at start up
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Mar 17, 2017 | BMW R 1200 GS Motorcycles

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I have a 18hp kohler it starts and ruins for 5/ 10 seconds and them shuts down and there is a cloud of white smoke

Air cooled engine ok ,
When the engine shut off did it white smoke out the garden it could be the head gasket
Low compression and it won't start poor compression and it might start but run poorly stall easily and white smoke produce because of unburnt fuel escaping into hot exhausts and vaporizing

Jul 03, 2016 | Garden

2 Answers

1980 GSX1100 Carburators over fuelling starts fine revs freely at stand still - when riding gets to 4500 revs starts popping and pulling back.

By the sound of your description of the problem which was that at about 4500 RPM under load the bike starts 'popping and pulling back' it seems to me that you are experiencing a lean (not enough fuel) condition. Popping and 'pulling back' are indicative of a lean rather than a rich condition. Revving the bike in neutral does not use much fuel compared to trying to throttle it under load so testing it in neutral does not mean much.

Assuming that it is a lean condition that you are dealing with I would pull the carbs off and then remove the float bowls and check out the float valves under each float to make sure they are not partially gummed up and not allowing enough fuel to flow into the float bowls fast enough to keep up with the demand when the engine is under load. Also check the main jet in each carb to make sure it is clear. All the fuel from about 1/4 throttle opening and above goes through the main jet first but from about 1/4 to 3/4 throttle the fuel is then regulated by the needle jet and slide needle. After that, from 3/4 throttle and on, the main jet is the only form of fuel regulation. Either way all the fuel needs to get through the main jet first except at idle and right off idle as that is the pilot jet circuit so the main jets need to be clean and clear.

Also, as the bike is pretty old, when you have the carbs off you need to carefully examine the rubber intake manifolds that connect the carbs to the engine for cracks and splits. These manifolds should be replaced every 10 years or so as when they split and crack it lets air in through the splits and cracks and leans out the mixture going into the engine and will cause the same popping and 'dropping out' that clogged jets in the carbs will cause.

Mar 05, 2014 | Polaris New Genuine Polaris Snowmobile...

1 Answer

Smoke from exuest

Exhaust smoke from an air-cooled engine will either be oil or excess fuel. On an Innova it will be oil as the engine will not run with a fuel mixture rich enough to show unburned fuel in the exhaust
Oil smoke is generally caused by worn piston rings or worn exhaust valve guides.
Worn piston rings will show smoke all the time the engine is running. Worn valve guides will generate a puff of smoke after the throttle is re-opened after it has been held open for a while and then shut off.

The only cure is to replace the worn components and that may include a new piston/cylinder assembly as on these bikes, a re-bore is more expensive than replacement.

In both cases the engine wear is because the engine oil used failed to deal with the heat of the piston rings and/or valve guides, The usual reason is that the engine was used hard, the oil wasn't of good enough quality to deal with the heat, and broke down around the engine's hottest parts.

If you are going to abuse any small engine, use a (non car brand specific) fully synthetic oil like Amsoil 0w-40, Mobil 1 0w-40 or similar.

Jan 25, 2014 | 2006 Honda ANF125 Innova

1 Answer

My wind bike seems to be having more black colored smoke emissions? whats the problem? the valve was mop already and adjusted.

I am not familiar with your Baja Wind 125 motorcycle, however, normally, black smoke is associated with too much unburned fuel in the exhaust - too rich a mixture. Is your choke fully open when this is happening? Are yo usure? Remove and examine your spark plug(s). I expect they will be sooty sooty black. Is your air filter clean, the air path completely unobstructed? Have you messed with the fuel adjustment? (I am not familiar with the term 'mop') Is your bike equipped with a Cat Converter? If so (not likely ...) it may have to be cleaned or replaced.

Some times, black smoke or sootie plugs results from using too low a gear, not running the engine fast enough for the riding conditions. Usually, the engine will buck if you are expecting too much from it by being in too high a gear. This is a very rare condition, having too low RPM for conditions.

FYI, Black smoke = too much fuel, Gray or Blue smoke = burning oil (worn rings?), White smoke (in water cooled engines) = water in the oil, blown head gasket or other trouble.

If your bike was recently serviced, I suggest you return to the mechanic and have them take another look at your motorcycle. If not, this may not be a bad idea anyway. You do want your motorcycle to perform optimally, right? Best ride and economical operation = most fun.

Some other things you can try, get a hotter plug. Replace the air filter.

I hope this helps you with your Black Smoke issue.

Thanks for your interest in

Jul 18, 2011 | 2006 Bajaj Wind 125

1 Answer

Tractor will not start unless you poor gas into the carburetor. When it dose start it let out a small cloud of white smoke I have changed the fuel filter,spark plug & air filters on the tractor. It has...

It sounds as if your carb. needs cleaned, the fuel line is obstructed or the fuel filter is stopped up. All of these will prevent fuel from moving throught the carb. to the engine.

Jul 10, 2011 | John Deere Garden

1 Answer

Occasional heavy smoke on tickover, but not using oil and oil clean.

HI do you now the color of the smoke
if engine emits white smoke its not burning the fuel
it could be water mixing with fuel = head gasket even tho you
dot have water in the oil
if engine emits black smoke - that's excessive fuel to air ration
check air filter & air inlet to see if clogged

if engine emits blue smoke - excessive oil consumption
cloud be valve seals

Jun 28, 2011 | 1996 Volvo 850

2 Answers

I have Hyndia Tucson 2006 Deisel. I have a problem in it. This problem is smoke heavily (Black) and there is no intention of any force during press the accelerator.

mean there might be fuel leaking into the engine or the air to deisel ratio is and not atomised correctly. the main causes are normally is the air filter that isnt allowing air into the engine. Fuel filter can also be at fault not allowing enough fuel in or allowing to much in the engine sometimes. This causes the chamber to burn it out. Fuel injector if fualty could allow to much fuel or not enough. My personal suggestion would be to run fuel injector cleaner first, then change the air filter. If that doesn't fix it change the fuel filter. I would go the cheapest route first. Is is prolly something simple

Nov 07, 2010 | 2006 Hyundai Tucson

1 Answer

When first started black smoke comes out exhaust pipe,, what could this be

Black smoke is burning oil. Blue smoke is usually transmission fluid due to a leaking modulator valve in the older auto transmission. White smoke is due to water getting in to a cylinder from a bad gasket, cracked block or a cracked head. Black smoke from engines on starting and/or running tends to mean there is fuel leaking into the engine, or the fuel mix is incorrect and not atomised correctly. the main causes are normally a nakered air filter that isnt letting enough clean air into the engine to mix. a blocked fuel filter, which is either not letting enough fuel in, or in some cases, a faulty fuel filter which is letting too much fuel into the engine, and causing black smoke due to excess burning. Black smoke is a fuel/air mixture suggestion problems with injection or carbonation. Cause of black smoke is due to running rich in the fuel air mix. Check the oil,the oil leak,the air filter,the fuel pump and fuel filter to confirm the fault.

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Sep 22, 2010 | 1986 Mercury Grand Marquis

1 Answer

99 GSX600F idles badly, belches smoke

i think your right!! take your drain plug off and drain some oil out....look at it condition does it have small bubbles in it does it smell funny or look like a milk shake?
if it does you probably have a cracked cylinder wall.

Sep 07, 2009 | 1999 Suzuki GSX 600 F (Katana)

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