Question about Honda CBR 600 F(3)W Motorcycles
Bought the bike from a guy that had it sitting for 3 years. it did not run the motor did turn. when i got it home i drained the tank and used the screw under each carburetor to drain the carburetors. added new fuel and gave it a try but no luck. i try a couple of times and checked with the drain screw under one of the carburetors but no fuel came out. the pump does feel like its pumping. help please
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Posted on Jan 02, 2017
SOURCE: Fuel Leak from the Carburetor
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Check the float as they can go bad and fill with gas such that they no longer float. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
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Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. The idle speed will probably different so adjust the idle screw to get back to where it was. This process should get you back on the road.
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Posted on Apr 23, 2009
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.
Posted on Jan 28, 2009
SOURCE: cbr 600 f3 will not start
wow, 7 years without use! try to check if the fuel pump motor is still working... also check the fuel lines if its clogged.. I hope you get your bike up and running again... feel that adrenaline rush when going 100+mph.. hehehe.. have a good one bro...
Posted on May 26, 2009
SOURCE: cbr250rr 1990 model won't start
Guess I should post my answer as a solution so you can rate the solution. Clarifications can't be rated. Any results yet?
The timing should be okay. Sitting for two years will not change it. Pull all the plugs and give a shot of WD40 into each cylinder while pushing the starter button. This will get some lubrication to the cylinder walls and piston rings. It will also help the rings to seal up. Now do the compression check. The readings should be within 10 psi of the top reading. If using aerostart, spray it into the air cleaner not the carbs. The air cleaner will greatly lessen the chances of a fire caused by an engine backfire. Always have a fire extinguisher on hand when messing with the carbs.
Bear in mind that some of the rings may be stuck in the piston grooves and will not be free to spring outward to seal against the cylinder wall. The WD40 may help here also. The worst case is that you will need to pull the head and cylinder to physically free the rings. Your pike is now 19 years old and the valves have probably never been worked on. Now would be the time to re-seat the valves. Depending on the condition of the cylinder, piston and rings, you may want to re-bore the cylinder and mount new piston and rings. At least run a cylinder hone through each cylinder.
I was going to just post this as a "clarification" but have sort of gotten into it now. All I ask is a "Helpfull" rating The "Thanks for trying" rating is a real bummer for a guy just trying to help. Get back to me.
Not sure what manual you have but compression is never checked at anything above idle. Crank and idle speed compression should be 140 to 160 psi.
Posted on Jun 03, 2009
You cannot bleed the fuel injection system.Test the pump alone (not on the bike) for sufficient fuel supply.Also check the fuel pump relay.
If all that is ok next time you try to crank the engine (only with kill switch on, the fuel pump primes up) with lifted tank and opened air box, spray a bit of carb cleaner spray towards the throttle bodies.It will help.
Posted on Jun 09, 2009
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