I dropped the fuel from a friends carbs,which contained fine dirt deposits.i then filled the carbs several times and repeated the process until the fuel ran clean.the bike then started and was rode for about 2 miles.when the bike was allowed to cool down and tried again it would'nt start,what would you advise,cheers Dave.
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best way is to remove the carbs ! get 4 x 4mm drill bits , set carbs on a wide tickover gap on butterflies until you can get the drill bits in the gaps and adjust till all 4 carbs are set the same gaps just slightly touching the butterflie bottom edge and the drill bits trapped between them and carb venturies ! then return the tickover back to shut on the butterflies and look and see if they are all opening and closing together and gaps same after several times ! should be correct if all links are ok ! final tickover setting when fitted on bike to about 600 to 800 rpm ! while the carbs are off you could strip and clean them if you wish ! hope you understand this ! ?? cheers P...
The fuel system needs cleaning. Remove the carbs and petcock and clean them both out. The carbs have plugged jets which cause that. If you are not sure of how to properly clean out the carbs, I recommend that you take them to a shop or someone who knows how to.
Sounds to me that the float may be stuck in the raised position for that carb. This will keep the needle vavle closed preventing fuel entering the float chamber. has the bike been left in the garage for a while on its side stand if so that might also indicate that the float pivot pin is worn and as the fuel evaporates the float has jammed against the side of the float chamber. Carb cleaner slight tapping of the side of the carb float chamber and possible a squirt of compressed air. All worth a try before a massive strip down. Jim ex heli-mech.
The most common issue of bikes not starting after they have sat for a while is the carbs have gotten gummed up from the gas sitting in them. Gas breaks down and gums up the fuel and air passageways in the carbs after it sits for awhile. You need to remove and overhaul the carbs.
This is the single most common repair we see as motorcycle techs.
To be certain it is fuel related, it doesn"t hurt to spray some carb spray into the engine and see if it fires up briefly. If it does then you know its fuel related.
Problems like these can be the most difficult to diagnose- especially when not in person.
Time is not a factor when it comes to water in fuel. Water can condense in a tank in just a few weeks or you could have pumped it directly from a filling station.
Its easy to check for water in fuel... Get a clean container, preferably clear or white in color ( makes it easier to see contaminates/ water). Shut the petcock off or if its vacuum driven turn the petcock to on. remove the fuel line from the carb end and place in the container. turn the petcock on or to PRI (prime) and let some fuel flow into the container. Shut the fuel off and let the container sit undisturbed while you reattatch the fuel line to the carb and secure.
Now look into the container. Fuel floats on water. if you see little bubbles on the bottom of the container or a distinct seperation line in the fluid in the container then you have water in your fuel. You will neeed to drain your entire fuel system including carbs and tank and replace with fresh fuel. Maybe run a bit of sea foam through your fuel system to remove the remaining water. If you are lucky you can get by without removing the carbs and cleaning them.
If the fuel is good then you may be looking at an ignition problem.
The spec sheet doesn't say if your model has fuel injection or carbs. Assuming carbs, disassemble and clean them. You will want the shop to balance and sync the carbs as well. This should get you back on the road in style.