WRONG! I love my Z50R! Again, if you ride a modern bike you'll have no idea what a choke is, but even Electronically Fuel Injected motorcycles reveal a lot by “blipping” the throttle. Not a light job. A no-start can seem like something impossible to fix except in the shop, but there are many problems that can be resolved with some detective work. For many of us, the only issues we’ll ever have with a bike are of our own making. Give slightly too much throttle, then shut throttle fast. You need gas and spark to run any engine and good controls to use it. Lastly, confirm that the fuel is being supplied like it is supposed to by checking everything in the “Running on Empty” section above. Extremely lean motors can also stall out completely when given some light throttle. Used carburetors that have been sitting might have gotten plugged up with gunk. Working in this 1980 Honda cb 750. See if it wont kill your bike. You can find the pump by tracing the lines; most often it is easily accessible for a quick check. Naturally, the first thing you want to do is get safely out of the roadway. I would start with the carburetors. If there is a spark, check the plug gaps. Not the mains. You will raise and lower the needle by changing the clip position on the jet needle. If the petcock checks out, then the fuel pump and filter need to be checked. No matter if you have EFI or carbs, a Harley-Davidson or a Honda, here is a list of five common problems and triage steps you can take to diagnose the nature of a mechanical issue. Don’t be fooled into thinking it’s the transmission just because the sound goes away most the time when the bike is put into gear or revved. Valves lifters when they tap are a very “plinky” tap at idol and tend to get better if the bike is turned off and on, you correct the oil level, or the bike heats up. How long did they sit while you were getting the engine replaced ? Lean running engines tend to “hang up” at high rpms when the throttle is let go, and they also rev down slowly after the throttle is closed. Try starting with the kickstand up, clutch in, and bike in neutral to see if the motor spins. Not good. Camshaft (a big metal pole that opens the valves) chains sound like “ball bearings in a can” and rattle under the tank. If you can make it through the bog and then it suddenly roars to life, that's also a really big confirmation as well. I also check to make sure any vacuum lines on the petcock are attached to the carbs, as fuel won’t flow without that. Thanks! It seems to stay going for a short period of time in idle but no further than that. The exhaust smells VERY rich (dark, wet spark plugs too). Basically, shell start up fine and idle around 1500-2000 rpm (full choke) but upon going to 1/2 choke or giving her any throttle, she dies. Bike is cutting out and dies out when you throttle hard. Hopefully this will stop you from being jammed up by something simple, and it may just get you to the nearest gas station. 1982 Honda dies when given throttle. Any help would be great. Pull the jets and clean them til you can see perfectly through them. Jump to ... bun once i try to ride it in gear i can get to maybe a eighth to quarter throttle and it'll die almost like it's not getting enough fuel. What really happens is that it moves less and less inside the sheath and eventually the cable and sheath as a whole start to fuse into one nasty mass that overpowers the return spring. Try running some sea foam through your carbs. If it does catch, it's at very high throttle and takes off like a rocket. My bike is sputtering whenever I give it full throttle The problem of having an engine “sputter” is typically caused by a fuel system issue. You close the throttle and pull the clutch - and then the engine dies. If it spits you out of gear, jams in gear or just won’t go into gear, than there's very little hope that anything but a total rebuild will fix the issue (for most motorcycles). When revving it in neutral you can hear it break up a bit right at 6000, after that it revs fine to redline. For carburetors that suddenly show signs of being in a rich condition, gently whacking the bottom of the carbs to make sure the floats (tiny little pieces that control gas flow like the rubber piece in the back of your toilet) are free. Cam chain rattles need to go to the mechanic but are normally not horribly costly to fix. Keep in mind that if you have CV carbs, the vacuum will vary because the throttle slides will constantly be making minute changes. But if the transmission “sputters,” rattles or pulses as you put it in or out of gear it’s normally just the clutch. You should feel the pump “click” as it primes. Also check that the choke cable works. Another sign of lean running is the “hunting idle” where the motorcycle revs up randomly, changes RPMs, or takes forever to come down to idle. I … Up until very recently, most bikes have had at least two cables that can go bad and cause headaches: the throttle, and clutch cables. A bog from idle is a lean condition not a rich condition ! This is only really visible in the dark; luckily, it is normally also audible – a regular crackling while turning the engine. Even if you can’t fix it, you don’t have to blindly trust your hard-earned cash to the honesty of the nearest “reputable” mechanic. For EFI, much of the old-fashioned carburetor malarky is done away with. They would just be a bit clogged up. You can check for additional info by pulling the plugs and checking the insulator base. If your noise is like that, you probably just need an oil change. The pilot jet controls idle, jet needle controls throttle from 1/4 to 3/4 of maximum throttle, and the main jet controls throttle from 3/4 to full throttle. Sometimes the engine just spins and you’ve already checked the fuel system like we’ve outlined above. It's much worse to walk away from a basket case bike, or to not walk away at all, because of an overlooked mechanical fault. If there is no click, check the fuses. Pull the carb bowls off. Ultimately, when it comes time to take it to the shop, give plenty of details and make sure you receive detailed information in return. I also disassembled and … For higher RPM you will need to order the next size up main jet and a jet needle that has notches at the top. Symptoms: Starts well, idles well but it sputters and pops (doesn't die) when I apply the slightest throttle. I was so happy to hear her running again so i let it warm up so i could take it out, but as soon as i gave it any throttle, it dies out. Also pull the emulsion tubes (the bits the main jets screw into) and clean those too. I have a 1995 Yamaha Blaster that will start up and idle but everytime I touch the throttle - whether it be a little or a lot - the RPM's drop rapidly and it will stall. Sometimes the motorcycle breaks in a big way. This story evolved from being about choosing the right mechanic to tackle fixes, because identifying what's wrong with your bike before you get the mechanic will help you pick the right one. Generally they should be a slightly tan. only 2000 miles. I had them cleaned roughly a week before I blew it up. and its been running better than ever. So far it has been a great little bike with no issues, I got it serviced around 3 weeks ago, new sparks, oil and air filters, oil change etc. The bike hasnt been running to my knowledge for 4-5 months. EFI bikes also all have a handy “self-diagnostic mode” which will flash out a numeric code through the gauges. Engine Issues: Bike Dies when given throttle? i think im going through the same thing...i can only add that my bike WILL NOT idle unless choke is on a little less than 1/2 way...this is after riding around for 20-25 minutes too! A clunky gear box, which sometimes makes a metal punch noise, doesn’t usually mean much except that it's designed to shift fast and take abuse. Some of the connectors are easy to find – for example, the electrical thing plugged into you kickstand is the kickstand switch – but others may be really elusive without a schematic. After I let it warm up, I gave it some throttle and it dies on me. After this happens, i have to let it sit for about 15-20 minutes before it will start up again. It helps if it’s set to “ON.”. If it starts, something is wrong with the starter system. I have a 1982 Nighthawk 650 that idles but whenever I give it any throttle it dies. I think the reason is the engine is still cold and the fuel does not atomize properly. Keep in mind the real trick is to get the lube down into the outer shell so it can clean away grime. In a pinch, or if you don’t want a special tool you’ll hardly use, set the wire against the engine with a metal screwdriver and look for a blue flash. A key clue is that the issue gets better as the bike warms up. Pumps can be tested by putting a finger on them and clicking the ignition from off to on. But, as soon as I give it throttle in any of these positions, it dies. and it dies when I let off of the throttle. Hey guys, i recently blew the engine on my gs500 and bought/ installed a used one from the same year bike. '85 rebel dies when given throttle. But close! It seems as soon as I pull the throttle the engine dies.. After that, solving a rich condition gets more involved – such as checking the spark plug gap or fuel bowl levels. You start bike and immediately drive off. Don’t feel bad walking away from a bad shop. We use cookies to give you the best possible experience on our website. Prior to my purchase the previous owner, a friend, said he cleaned the carbs. I … The idle is obviously what gives you fuel during idle. You can see when I start the bike up I was giving it a bit of throttle (trying to rev it up a little) and it just stayed at a constant RPM and then shot up for a second even though I wasn't moving on the throttle at that point. This makes it VERY hard to work on my wheelies! Ask questions, like why a part is needed, and inquire if there could be other causes. I doesn't do it if I let go if the throttle when it starts to stall, or if I twist the throttle open all the way slowly. TPS sees fuel going in and compensates, but compensates for nothing. The gas can’t flow out. I designed this guide to help people clear up the “simple fixes." It seems transmissions can be shifted quietly or quickly, but physics gets in the way of making it do both. 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I 've been working on getting it running again this makes it very hard to work on my wheelies,... To do is get safely out of it or are easy with the sidestand down will constantly be making changes! Engine is still cold and the neutral light can all break to cause this type of problem battery OK! Her up constantly be making minute changes previous owner, a Yamaha XVS250 stalling I. Quarter turn in both directions before you can try riding without the clutch to release all the way causes! Changing the clip position on the jet needle rests at the top that idles but whenever I give it,! A handy “ self-diagnostic mode ” which will flash out a numeric code through the gauges also have. Start there are sometimes cases where the spark plug gap or fuel bowl levels I agree, you carb..., a friend, said he cleaned the carbs idle circuit to the carburetor the! Bought it from rebuilt the carbs '72 Honda CB750K2 & '07 Triumph Bonneville T100 the spark gap... Up the “ simple fixes. stop you from being jammed up by something simple, and when that it... Get you to the other comment for a reason connected right and has not helped 3 miles.!