SOURCE: 1988 suzuki samurai
I just ran into this problem as I was rebuilding my 1.3 engine. When you put the mechanical pump back on, you have to be sure the rod that pushes against the pump is all the way in, check this with your finger, you should only feel about 1/4 inch of the rod, if you should feel more, turn the crank with a wrench until it goes in all the way. Then put your pump on making sure that you start both mounting bolts before you begin to tighten, as you tighten gently pull back on the top of the pump, so the lever will line up with the pumps push rod in the head. Your pump will work fine after that.
SOURCE: fuel leak
Sounds like one or more of the floats in the carbs is not seating, allowing the fuel to overflow the carbs. This would likely mean there is some trash or varnish in the float bowl. But, of course, there is a possibility that a fuel or vacuum line is leaking or has become disconnected. See, the fuel tap, also called the petcock, when it's set on RUN or ON only flows fuel when the motor is supplying vacuum to it. You may be able to switch it to PRI (Prime) and then find where it's leaking from. This way you don't even have to run the motor to get the fuel to flow. Good luck, keep us posted.
SOURCE: engine runs, but it will not rev up past 2000-3000 rpms,
are you turning the choke off after its warmed up? most will not run with the choke on and warmed up.
also try running it with the gas cap open to see if you have a vent issue in your tank. if air can't get in, then gas can't flow.
if not a choke or vent issue, then try this. turn the petcock off and then disconnect the fuel lines one at a time going into the carb. start with carb fuel line #1 disconnected (and the rest connected) and in a coffee can, turn petcock on and ignition too. fuel pump should come on momentarily and inject some fuel. see how the quantity looks. reconnect the line to carb #1 and repeat for carbs #2 - #4. your looking for a decrease in fuel to a couple of cylinders.
if all looks fine, i would then focus on the carb floats & jets. have the carbs been off for a good cleaning lately? modern fuel breaks down quickly and could cause a gumming condition in the carbs. spraying the sea foam or carb cleaner into the carbs is bypassing the everything in the carb bowl (but it means the spark plugs are ok) so there could be an obstruction. i would look there first.
if uncomfortable removing the bank of carbs, you can try a quick fix first. with the petcock closed, open the drain screws of each carb and let the gas drain out. go and buy some yamaha carb cleaner (liquid in a black bottle) at a yamaha motorcycle dealer. mix it in a separate container with gas as recommended. close the drain screws on each carb. pour the mixture into each fuel line feeding the carb and let it sit overnight. DO NOT POUR THIS MIXTURE INTO YOUR TANK. its not a fuel additive, but a cleaner that will not harm orings or gaskets, but it will not ignite with a spark plug. open the drain screws the next morning and let the mixture pour out. reconnect the fuel lines to the carbs and test drive it.
if that didn't work, then removing the carbs for a good cleaning is my next step. good luck.
SOURCE: 1997 Yamaha FZR 600 cuts out when shift into first gear
Does the bike have a sidestand switch that cuts the power if the stand is left down? If it does, disconnect it and temporarily join the ends together and try starting....
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