Question about Motorcycles
Only runs briefly on starting fluid. Has fuel and spark
Posted by Anonymous on
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Posted on Jan 02, 2017
There are 2 sets of serial numbers one set on the motor and one on the frame. The ones on the frame are on the "gooseneck", (where the triple clamps to your forks are connected). The other set on that motor are on the center cases on the top of the engine. As I recall they are just above the left side engine cover.
Posted on Dec 09, 2008
your idle/primary(pilot jet) circuit is blocked.Clean the carbs or have them professionally cleaned and put the starting fluid away.
Posted on Mar 28, 2009
SOURCE: 1989 tw200 yamaha won't start
G'day egdbcs . Ok.now lets see.You say good spark,so i'm presuming you are doing the old sight test.Try bending the arm on a know good sparkplug about 5-6mm,earth the plug and kick'er in the guts(crank it over)Be very carefull , high voltage danger.If there's still a good spark it's safe to say that there will also be a good spark under pressure in the combustion chamber,speaking of which you should also do a compression test,anything over 100psi should be ok. as i'm not to sure of the extent of the re-build,hopefully the valves were lapped and checked for straight and true and valve seals replaced,if you notice oil on the tip of the spark plug you could have a leaking valve seal or oil seal .Try putting a small amount of fuel directly into the combustion chamber ,tighten up the spark plug ,install the plug cap and.......Yeah ..You guessed it ..."kicker in the guts".If all the abouve are correct and true it should fire up.If it runs for 5-10 seconds then stops you've got some sort of fuel starvation problem , could be dirt in the carb,blocked idle jet ,or air passage or even the needle could have come off it's clip,believe me with an old bike like yours anything could be worn and loose inside that carby.The only other thing to consider is the timing.There may be a good spark but is it happening at the right time inside the engine???. I'll leave it all in your capable hands EGDBCS.Hope this helps to solving your worries. Chow for now......Tilleydog..
Posted on Jun 03, 2009
get the clymer yamaha motorcycle repair manual for 1981-2002. it will be twenty bucks well spent.
most book stores carry it or you can go to a motorcyle shop or on the internet at clymer.com
Posted on Jun 26, 2009
SOURCE: yamaha big bear 400 will
Sounds like a problem with the starter, could be a starter fuse, relay or solenoid. The start cicuit wiring could also be damaged. If you can pull-start the motor, and it runs fine, you have pretty much eliminated any problems with the motor. Check the wires running from the start button make sure they are intact, also trace them and look for around a 1" cubed black box. This is the relay, when you push the button, if its working, you will feel the box click. Also locate the starter and do the same thing. If you feel or hear the starter click, the solenoid is working. The battery voltage could also be too low to energize the starter motor. Could also be a battery or alternator issue. Check the battery voltage and for any sounds coming from the bike when you push the start button.
Posted on Aug 21, 2009
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If a starter is able to crank the engine but it won't start you usually have either an electrical or fuel problem. It's also remotely possibly that it's compression.
If an engine has proper fuel, spark and compression, it will start when you crank it. So your challange is to find out which part isn't working right. Start with fuel. Spray a little starting fluid into the air intake while someone tries to start the engine. If it starts briefly when you're spraying starting fluid, you probably have a fuel delivery problem. That could be injectors, fuel pump, fuel filter, relay, fuse... who knows what until you check into it.
If it doesn't start with starting fluid, check the spark. Pull a plug wire and attach it to a spare sparkplug and set the plug on a solid metal part of the engine. Have a helper crank the engine while you watch the plug. If you have a good spark, it might just be out of timing.
In any case, you'll need to start isolating the problem. Find out which part isn't working then you'll know what to replace/repair.
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