Question about 1976 BMW R 75-7

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Old gas in a motorcycle carburetur

Old gas gunk in a motorcycle carburetor

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The carb must be pulled apart and boiled out, otherwise it will not run, trust me on this.

Posted on Sep 12, 2009

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Posted on Jan 02, 2017

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Why won't my bike run when it gets warmed up?


Try checking the choke to see if it is sticking. Add a bottle of carburetor cleaner to the gas and see if you can free up the internal workings of the carburetor and possibly clean it. You could have a clogged jet. Depending on how old your bike is and how bad the gas you have been running in it, your fuel filter could also be clogged. If the fuel filter is full of gunk, drain your tank, replace the fuel filter and fill the tank with clean gas.

May 02, 2015 | Motorcycles

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1990 Johnson115 outboard motor sat up for years started one time n now won't start


Fuel residue also called varnish is clogging carburetor passages and / or the fuel pump. Old gas evaporates leaving behind gunk that looks like varnish. To keep from being up the proverbial creek, you need to take apart the carburetors and fuel pump and clean them out. The link shows a carb apart and the video is representative of taking apart a carb but may not be the exact part.
Carburetor Parts for 1990 Johnson 115 hp J115TLASB Outboard Motor

Feb 03, 2015 | Boating

1 Answer

I have a Troy - bilt generator that when I try and start it it will turn and then backfire, why?


when was the last time it ran? Ethanol gas is deadly to carbureted engines. If the gas is a few months old, your carburetor might be loaded with gunk and rust ( thank your politicians for this gas).
Also take the covers off and see if Mice have enjoyed living in your generator. Very common problem

May 26, 2014 | Garden

1 Answer

Lifan 50cc scooter not starting. I replaced choke solenoid and cleaned the carb. Am getting spark and putting sight vacuum on on hose leading to gas tank valve does produce gas flow in hose attached to...


It requires three main things to start the scooter:--- 1)Gas. 2) Spark. 3) Cylinder compression.---------- Any of the one is not functioning right so scooter is not starting.------------ Its possible that gas is not flowing till the carb and that is causing the problem.Either gas valve is clogged or faulty.Or gas line is clogged or carb itself is dirty and gunked up inside and needs to be cleaned.--------- Click this link below and follow the troubleshooting :--- http://whatisbyme.blogspot.com/2011/08/lifan-50cc-scooter-not-starting.html ----------- This will help.Thanks.Helpmech.

Aug 18, 2011 | Lifan Knight 125 Motorcycles

1 Answer

13 horse Honda presure washer (landa) won't start. Been sitting for several years. Checked plug which looks new.. Maybe wrong one? Will sypone old gas and replace. What about plug, fuel filter and air...


you can try and remove the old gas the carburetor and perhaps the fuel filter are most likly fouled with gunk from the old gas. When gas sits, over time it forms a thick gummy deposit that can clog carburetors, and anything else. try fresh gas with some carburetor cleaner (NOT the kind in the spray can) mixed in. It may need to have the carburetor rebuilt or replaced.

Jul 10, 2011 | Honda Garden

1 Answer

I just purchased a 1998 Shadow 750. The guy that had it wasn't riding it. We tried to start it, no luck. I emptied all the gas lines (because it was 2 yrs old gas) tried again still no start. It has...


If it sat for two years with bad gas in it, you will have to take off the carburetors and clean them thoroughly. Make sure all the passageways(slow jet, high speed circuit, carb body,etc.)are clear of gunk. Take the fuel inlet tube for the carburetors and place it into a fuel container and turn the bike on for a few seconds to test that the fuel pump is working. You may also want to change the fuel filter.

Sep 08, 2010 | Honda VT 750 Shadow Motorcycles

1 Answer

Ran out of gas, put gas back in. will not start again. will run on starter fluid but dies when it runs out. sat for a day, started and ran 2 min. and quit. there is bolts under the carburetor -- is...


Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming the carburetor a few times, and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
If the mower/weedeater is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, You will first seat the jet screws and count the number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns they were in/out.
Please rate me,
Thanks
Good Luck,
I hope this helped

Aug 15, 2010 | Yard Machines 11A54MC006 21Inch 139cc MTD...

1 Answer

Gas trimmer runs for a few seconds and then stops


Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
Please rate me, Thanks
Good Luck, I hope this helped

May 02, 2010 | Craftsman 25cc Gas Line Trimmer

2 Answers

Ignition problem with CB750K Honda


Please check carbs again. Gunk sometimes hids. Clean out orifice's
(vacuum inlets) real good, then spray with air hose. It takes time to get a bike ruuning good after setting over 6 months.

Oct 15, 2009 | Honda CB 750 Nighthawk Motorcycles

2 Answers

Honad bogging down when accelerating.


If it has been sitting for a while, there may be varnish and gunk buildup in the carburetor from old fuel. The easiest way to find out is to remove the air cleaner and look inside the carburetor with a flashlight. If there is varnish you will definitely know it's there. While you have the air cleaner off take a look at the filter too.

While you're at it, pull the spark plugs and look at them, clean as necessary.

If it is indeed varnish buildup in the carburetor, pull it off and clean it and then pull the tank, drain it, put it back on and fill with fresh gas.

To keep this from happening again, when you put the bike up for the winter add some fuel stabilizer to the gas in the tank.

Sep 17, 2009 | 1984 Honda VT 500 C Shadow

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