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Motorcycle Forum / General / Motorcycles / April 2008My 1986 FZ600 won't start
I have a 1986 Yamaha FZ600 and the battery would die as I would turn it over. I put new spark plugs in it and charged the battery and low and behold it fired up in a split second. It ran great and started great until the next day. I went to go and start it and as I did it would start at an idle but whenever I would give it gas it would bog and die. As long as I left it at an idle it would be fine. I took off the fuel filter and hooked up the gas line directly and it did the same thing. Does anyone have any ideas what it could be? Thanks alot. Kelly On Apr 23, 11:22 am, KellyR...@gmail.com wrote: > I have a 1986 Yamaha FZ600 and the battery would die as I would turn > it over. I put new spark plugs in it and charged the battery and low [quoted text clipped - 5 lines] > same thing. Does anyone have any ideas what it could be? Thanks alot. > Kelly Gummed up carbs? Greg > On Apr 23, 11:22 am, KellyR...@gmail.com wrote: > [quoted text clipped - 11 lines] > > Greg Hi Greg. I took the carbs off yesterday and put brand new jets in and I looked inside the carbs and it was spotless. Is there something else I should have done? And thanks for the reply. Kelly On Apr 23, 8:46 am, KellyR...@gmail.com wrote: > Hi Greg. I took the carbs off yesterday and put brand new jets in and > I looked inside the carbs and it was spotless. Is there something else > I should have done? Yes, you should have douched out the idle ports and passages with Berryman B12 Choke and Carburetor Cleaner. A gummed up carb won't pass the fuel that goes through brand new jets. The ports and passages provide a pathway for the fuel and air that pass through the jets. Douche 'em, douche 'em good... > > On Apr 23, 11:22 am, KellyR...@gmail.com wrote: > > [quoted text clipped - 16 lines] > I should have done? > And thanks for the reply. Kelly What did you fiddle with, between when it ran fine and when it didn't? Or before it ran fine, come to that?  SignatureBMW K1100LT Ducati 750SS Honda CB400F, SL125 & SH50 chateau dot murray at idnet dot com "What you're proposing to do will involve a lot of time and hassle for no tangible benefit." > What did you fiddle with, between when it ran fine and when it didn't? Oh, geezzzz, you aren't supposed to ask things like that until we have flailed around for at least a week getting no where !!! ;-) > > What did you fiddle with, between when it ran fine and when it didn't? > > Oh, geezzzz, you aren't supposed to ask things like that until we have > flailed around for at least a week getting no where !!! ;-) Heh. In my experience, a question like that usually throws up: "Well, I only...." Or: "My friend, who knows bikes (he had a Triumph in the 1960s), re-set the grunge sprackler thingy on the silver bit of the engine, where the wires are..." SignatureBMW K1100LT Ducati 750SS Honda CB400F, SL125 & SH50 chateau dot murray at idnet dot com "What you're proposing to do will involve a lot of time and hassle for no tangible benefit." >> > What did you fiddle with, between when it ran fine and when it didn't? >> [quoted text clipped - 7 lines] >the grunge sprackler thingy on the silver bit of the engine, where the >wires are..." "I swear I didn't touch it! It's not my fault!" SignatureTurby the Turbosurfer On Apr 23, 11:46 am, KellyR...@gmail.com wrote: > > On Apr 23, 11:22 am, KellyR...@gmail.com wrote: > [quoted text clipped - 16 lines] > I should have done? > And thanks for the reply. Kelly Did it run good after the new jets were put in? Were they the same size as before? Maybe pinched a fuel line and it took a while for it to really get flattened. Possibly a plugged gas cap vent. Try starting it with the cap open. Are you just putting this bike back in service? Maybe a plugged fuel filter from rust settling over night. The way you describe it, it sounds like it is starving for fuel. As long as it is at idle the enrichners (choke) will provide enough fuel to keep it going. As soon as you open the throttle it leans out. Bruce > On Apr 23, 11:46 am, KellyR...@gmail.com wrote: > [quoted text clipped - 34 lines] > > Bruce Hi everyone thanks for all the input. Bruce you are right, as long as the choke is on it idled fine but when I gave it gas it died. The bike sat covered for around 2 months (bought a 1998 GSX Katana F and have been riding that) I did take the fuel filter off and tried blowing through just the gas line and I couldn't blow through at all, so now I new I wasn't getting any gas through to the carbs . In the very beginning the bike would sometimes take alot to fire so I put new plugs in and it started right away every time and ran awesome until the next day when I went to start it, and thats when the problems all started. I had purchased a new jet kit last year and never got around to installing it until now. I thought maybe if I install them it will be fine but it kept doing the same thing (idling fine and stalling when I gave it gas). The fuel filter seems to be fine and the gas lines are brand new. Maybe it is gummed up? What could I used to clean it? I really appreciate the feedback. Thanks Kelly On Apr 26, 2:40 am, KellyR...@gmail.com wrote: > > On Apr 23, 11:46 am, KellyR...@gmail.com wrote: > [quoted text clipped - 53 lines] > > - Show quoted text - If you were blowing into the gas line while it was attached to a full carb nothing would go in because the float would be holding the needle valve closed. With the gas line unhooked turn the fuel on and see if any comes from the tank. You may have to put the shut off valve in the prime position if it has a vacume shut off. If you are getting fuel from the tank, hook the fuel line back up and remove one of the drain plugs from the bottom of a carb. When you turn the gas on it should flow out of the drain in a steady stream. If you are getting fuel from the drain then it is quite possible that the new plugs got fouled by running the bike with the choke on. While it is possible to get an engine to run with plugged up jets by keeping the choke on, it is also easy to make the mixture too rich and foul the plugs. Take a look at the plugs and see if they are black with soot. If you have been trying to start it they may also be wet with gas. You can try cleaning the plugs with emery cloth if they are covered with soot, but set it on the engine and be sure that it sparks before putting it back in. Sometimes the soot forms a conductive glaze and the electricity will go through it rather than jump the gap. When that happens it's new plug time again. If it starts up after cleaning/replacing the plugs then the real problem is plugged idle jets and you will continue to have problems till they are cleared. Let us know how things are going. Bruce > If you are getting fuel from the drain then it is quite possible that > the new plugs got fouled by running the bike with the choke on. While [quoted text clipped - 3 lines] > soot. If you have been trying to start it they may also be wet with > gas. What he said. I have weak spark on one cylinder on my bike and I experience this exact problem. I've even been known to carry a spare plug and a socket and a ratchet with me for roadside repairs. If your plugs come out black, either you're running wayyy too rich for some reason or you have an ignition issue (gap too big? plug temperature rating too cool? resistor plug instead of non-resistor? wire shorting to ground? coil bad?). > On Apr 23, 11:22 am, KellyR...@gmail.com wrote: > > I have a 1986 Yamaha FZ600 and the battery would die as I would turn [quoted text clipped - 8 lines] > > Gummed up carbs? Do you really think they gum up in a single day? It ran fine one day, and didn't the next. SignatureBMW K1100LT Ducati 750SS Honda CB400F, SL125 & SH50 chateau dot murray at idnet dot com "What you're proposing to do will involve a lot of time and hassle for no tangible benefit." On Apr 23, 8:22 am, KellyR...@gmail.com wrote: > I have a 1986 Yamaha FZ600 and the battery would die as I would turn > it over. I put new spark plugs in it and charged the battery and low [quoted text clipped - 4 lines] > the fuel filter and hooked up the gas line directly and it did the > same thing. Does anyone have any ideas what it could be? Thanks alot. You're saying it ran great one day but the next day, when you opened the throttle it would bog and die ? And the behavior had changed overnight ? CV carbs occasionally need a new diaphragm. Could be that I guess, but I'm confused by your statement that it ran great the first day. > CV carbs occasionally need a new diaphragm. > Could be that I guess Nah. SignatureBMW K1100LT Ducati 750SS Honda CB400F, SL125 & SH50 chateau dot murray at idnet dot com "What you're proposing to do will involve a lot of time and hassle for no tangible benefit." <KellyRabb@gmail.com> wrote >Does anyone have any ideas what it could be? Thanks alot. > Kelly A google user I see........... You are known by the company you keep! Does the bike have a choke? Do you know how to use it? |
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