Have to check the voltage regulator for burned wires or yellowed connectors,, also looking over every wire on the bike you can get to would be a good idea,, something could just have rubbed thru the insulation on a wire resulting in a dead short,,, look carefully for the damaged wire,, It could easily be a voltage regulator
We just replaced the reg on a SV650 and that was the trouble,
SOURCE: Battery drained while riding
chek your connection where the alternator plugs into your engine casing & spray it with electrical contact cleaner
SOURCE: my honda cbr 600 is struggling as if it keeps
It all seems to be leading to fuel starvation. Have you checked the tank breather is not blocked which can be a small hole in the petrol cap or a tube from under the tank. It could also be a blocked fuel filter. There should be two. One inside the fuel tank under the petcock, another before the fuel pump. Here is the workshop manual where you can find all info you will ever need for this bike.
Hop this has been useful, rate me if it has...?
Thanks and good luck.
http://www.carlsalter.com/download.asp?fileid=072111110100097095067066082095054048048070051095039057053045039057054095083101114118105099101095077097110117097108046114097114
SOURCE: honda cb750 f2 1978fault on old bike ! electrical problem
From your explanation it sure sounds electricals, but surprising to hve a total failure to the electricals and thn it reappears after 30seconds!
Best would be to go through the wiring especially frm the battery onwards, the fuse box .
Since it is totally disappearing it should be a fault to those main wires could be lose connections somewhere!.
Hope this helps.
SOURCE: 94 GSXR 750 DIED WHILE RIDING AND WILL CRANK BUT NOT START
There may not be an in-line fuel filter on the bike. Most bikes don't come with them. Yes, the fuel petcock has two screen filters on one pipe and they can get clogged up. Remove the tank then remove the petcock and clean it. The gas in the tank should be dumped into a clear plastic storage bin so that you can see if there is any water in the gas as well as rust and trash. Your bike is 15 years old and the inside of the tank may be rusty. If so, Google “ kreem fuel tank liner “ or go to
www.http://www.4secondsflat.com/Fuel_Tank_Sealer.html
This will end the rust problem. Go ahead an install an in-line fuel filter. There is a drain plug on the lower left side of each carb. Drain each carb into a clear container and look for water and trash. You may need to clean the carbs but hold off to see if the other stuff fixes the problem.
Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock.
www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx
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SOURCE: 1990 virago 535 starts and runs great for about 3 or 4 miles
Pull the float bowl caps off the carbs and then spray carb cleaner into the main jet and all other accessible ports on the carbs. Chances are there is a build up of water condensation in the carbs.
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