V 1356 starts/runs well for approx 2 miles then shuts down, (looses power and quits). While coasting it will bump start easily and continue to run for 100 yds before having to repeat the bump start sequence. I can get another 2 mile run only if engine sits for 5 min before restarting. All attention has been on fuel system ie. gas flow-float level-tank vent-filter. Am I overlooking something....hopefully simple? Thanks for input. Harry #994
HO,
Well I think you need to try and separate the two...fuel or electrical. I suspect you have an electrical problem, but since you titled this Bing Problem you can easily take the carburetor out of the equation. When it stops turn off the gas petcocks and see if you have plenty of gas in the bowl. If you don't you need to start looking at the check valve that allows the gas to enter the carburetor.
On the electrical side you need to be sure everything has a good ground including the coil. Next if when the bike stops check the fire at the spark plug and compare it to the fire before you ever start the bike. If the bike is stock you have points so I would change out the internals of the ignition system and check the timing.
This is just an initial check. Let us know.
Ron Carbaugh
Thanks Ron...you have given me hope. I never would have tried this approach...another example why POG contributors such as yourself have been indispensable in my efforts to get my "old stuff" running again. Harry
If you haven't done so already, you might want to see if the screens that are around the inlets of the petcocks, inside the tank are clean. Take the fuel line off and open the petcocks one at at at time and see if the fuel flows freely and continuously, if not just remove the petcocks and look for dirt on the screens. It sounds to me like you might be running out of fuel. Is there a filter on your fuel line, if so it might be a bit clogged. When you run the bike be sure to leave both petcocks open to help eliminate the fuel flow probability.
Another thing to try is to hold the tickler on the carb down when the engine starts to quit, this will allow more fuel into the bowl if the float setting isn't correct.
Good luck,
Paul
I have to agree that it sounds like an electrical problem if you have been looking at the fuel system. Like Ron said look for a bad ground, in the coil mounting, and the stator. If it has points, a bad capacitor will do exactly what you describe. Also look at your kill button if you have one, disconnect it completely as close to th coil and eliminate it from the mix.
BUT this has all the symptoms of an un-vented fuel tank. Get a see through inline filter and eliminate the guess work of a fuel supply problem. Another thing you can do to eliminate guessing about a vent is to ride it with the gas cap loose (be careful and don't make a mess).
Also when is quits, immediately gently tap the carb with a wooden hammer handle and see if it comes back to life. Could be a float sticking.
A motor that is vibrating too much (i.e. loose in the frame) can make the fuel in the bowl froth up and the bike wont run till it settles. Tapping the carb will break up the bubbles a bit quicker.
I know this is going to sound silly but I have seen spark plugs go south and act this way when they get hot. Also try reducing the spark plug gap to .005"-.010". If it runs longer that means your spark is getting weak.
I like Paul's idea of holding the tickler down when it starts to quit, that will eliminate any float sticking.
On previous trials running with cap off had no effect. On last trial it started on first kick and ran for the 2 miles. I let bike come to complete stop. It took a couple to seconds for tickler to
fill bowl...not as long as on initial start. It failed to kick start. (There is a muscle in the buttock area that I didn't know existed). I loaded up and after dinner approx 3 hrs later I checked float bowl and it was full...plug looked textbook, points were dry and clean and has spark at plug that I can see in daylight. It's not wired for a kill button cause I know death comes at a two mile mark anyway. Some say I'm a pessimist.
Wouldn't the coil ground effect the start up and first 2 miles? On build up I remember sanding paint from the coil mount area but I did not run a separate wire.
Thanks all for the response...I shall try some of the other suggestions. Harry
Typically, a bad ground is going to effect the ignition all the time, The condensor is another thing, if it is old replace it. I have seen sparkplugs go bad too. Coils can be a mystery I have been told that they either work or they don't but I am not sure that is true. Lets not forget the sparkplug cap can go bad too. I had one fail as I was pulling off the track. A new cap and I was back in business.
Gas flow can be tricky. My bike sat for alot of years and when I started riding it again, I cleaned the tank or at least I thought I did and I would run it and soon after a mile or two it wanted to die. The funny thing is that I had check to see if I had good flow and it looked fine to me. I let the bike sit a few minutes and the thing started back up, now I am really confused. I took it back to the pits, layed the bike on its side and removed the pitcock, to my amazement the screen was clear full of yellow crusty stuff. it was varnish that had be attached to the sides of the tank coming off. I cleaned the pitcocks and went out for the second moto. again the same thing. when I got home, I took the tank off, dumped a gallon of Laquer thinnner and some nuts to help aggitate and clean out my tank. then after, I took the petcocks off on a regular basis just to make sure I did in fact get all the junk out. what was happening is that the gas was flowing but not fast enough to keep the bowl full. by the way. when that happens, you bike will run lean and that is not a good thing. good luck my friend.
Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)
74'250 hare scrambler (project)
74' 1/2 440 maico
78' 440 maico
72' cr125 Husky (project)
74' TM125 suzuki
93' RMx 250 suzuki
Quotequote:Originally posted by harrO
It's not wired for a kill button cause I know death comes at a two mile mark anyway.
I'm hot. I'm tired. And my head is sore from swatting deer flies all morning. This quote made my day and made me laugh out loud.
Good luck with your bike. Sorry I didn't have any suggestions to add.