Question about Yamaha PW 50 Motorcycles
I bought this bike used two days ago it is a 1995 Yamaha PW50 and takes a long time to start when it does finally start it runs for a good ten min and then bogs out like not enough or to much gas has a new carburetor, spark plug, and if it is the start stop button how do I replace it.
Posted by Anonymous on
Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
3. Battery damaged or nearly discharged, should have 12.5 volts.
4. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
5. Throttle controls not adjusted correctly.
6. Water or dirt in the fuel system.
7. Water or dirt in the carburetor.
8. Faulty fuel pump.
9. Intake air leak.
10. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricting fuel flow.
11. Enricher valve inoperative.
12. Engine lubricant to heavy (winter operation).
13. Ignition is not functioning properly (possible sensor failure).
14. Faulty ignition coil.
15. Valves sticking.
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.
Just Bought Yamaha PW50 And Now It Has Trouble Starting
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Posted on Jan 02, 2017
SOURCE: pw50 problems stating bike
hey there matey,, just to run a few things with,, have u taken the spark plug out and cleaned it up,,try a new plug 1st,, to be sure, or if u have a new plug,, take out the spark plug place it back in its cap and rest it on the cylinder head and either elec start it or kick it over and make sure u have a spark ,, if all is ok on the above,, then turn to fuel and carburetta, make sure fuel is gettin to the carb 1st,, but u say u do eventually gettin it goin ,,then theres a blockage in jets ,,undu the bottom of the carb clean out the bowl, ,in the carb u will see a brass jet, un screw that and the needle guide that the jets screwed in to and using a pin or needle,poke the small hole clean so u can see light threw them,, bung it all back together and pray,, if no joy il get back to ,, ok m8, enjoy
Posted on Jan 10, 2009
the float pin is stuck or has some dirt in it. try tapping the side of the float bowl(s) with the handle of a screwdriver... not hard enough to break it. if that doesn't work you will likely have to take the carb apart and clean it.
Posted on Apr 06, 2009
If the bike has sat for a long period of time without being run - the gas that is sitting in the carb(s) will shellac.. Then the carb(s) would need to be cleaned and "rebuilt"..
Posted on Sep 14, 2009
When you cleaned the carb, did you get the needle valve put back in correctly? That is the small pointed valve that is actuated by the float. As gas flows into the carb it raises the float and the needle valve rises to shut off the gas flow. You should have put compressed air through the hole that the needle valve goes in. There is a removable jet that the needle valve tip goes into to shut off the gas. Remove a spark plug after trying to start it. If the plug is very wet it means the carb is flooding, and if it is dry it means the motor is getting no gas. If the plug is dry you can take off the air cleaner boot and pour a tablespoon of gas into the carb opening, then quickly try to start it. If it starts momentarily you know you just need to work on the carb. You also could remove a plug, put a teaspoon of gas into the cylinder, replace the plug and try to start it, to see if you get a pop or two. Put some Seafoam in the gas to help clean the carb. Make sure you use compressed air to clean out all the small passages in the carb. An owners manual would tell you exactly how to adjust the float level, but I think you can assume it's okay if you didn't do anything to it. Generally the gas shuts off when the float rises until it's about level. When you take off the bowl of the carb, before removing the carb from the bike, there should be gas in the bowl, but it shouldn't be overflowing.......somewhere around half full. Also, are you getting good compression? If that bike has a kick-starter it would be easy to determine if the compression is okay. If there is not much resistance to the kick-starter, or pushing the bike in high gear, the compression is bad and valves may be stuck or burned. Let me know how your project is going.
Posted on Jan 01, 2010
Pull the cab off spray it with carb cleaner, pull float bowl off to spray it clean, be careful not to drop anything and check to make sure your floats move up and down...I would suggest taking the carb over to a friend that know about carbs and he can clean it for you in just a few minutes.
Posted on Mar 24, 2010
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