ahoi... im havin abit of trouble with my throttle. actually i dont know if its the throttle. wen i start the bike up it seems fine give it a few revs to stop it from stallin then let it warm up abit. then i get down the road a little bit and it seems like there is no throttle response. the bike splutters then dies. could this be blocked fuel lines? dirty carbs? wat? id really like to get it fixed soon so if anyone has any tips put 'em up. hows to's would be awesome as well. cheers joe
theres been plenty of fuel each time its done it. sometimes when i stop at an intersection or something, then go to take off again, it barely idles, then if you stop givin it throttle it just stalls. and also wen im ridin sometimes i feel like its just loosin power, droppin revs when im keepin the throttle steady, so i give it more and it usually corrects itself, or it just starts studderin and dies. cheers for any help, my mate and i are currently takin the bike apart to try and find the problem so if youve got any ideas of where to look and what to do that would be muchly appreciated. joe
And let me guess..... When you wait a couple of seconds at the lights and hold the start button down for a while (with no throttle at all) it finally starts and runs okay for a little while. You may even notice a slight petrol smell in the air perhaps? Am I close?
kinda...the few times it has packed it in at lights etc, i usually pull over and try to start it and when it finally gets goin it barely idles, then dies. then after a few minutes it will fun alright for a while...
Okay...sounds exactly the same as the problem I had with mine. Its most likely fuel related and in the carby area. Things to check are: 1. Is the fuel filter blocked? These are really hard to tell as they look fine normally. Try to unlug the main fuel feed into the carb itself (and point the hose into a can or something to hold the gas) then turn the petrol on, then turn the key on and finally the on/off/kill switch. If gas flows out of the hose then this is a good sign. Other wise your not getting gas into the carbs. 2. My one was a dirty carb...in that carb #3 must have had some dirt in the float bowl that held the fuel seat open and eventually filled up the cylinder with petrol. A bit extreme I know...but once I took the carbs off and cleaned them (really well), then balanced them and set the idles etc. Did the trick a bit. I ended up having to drop the needles two notches as well because for some reason my one just likes running a little rich.
Mine is doing the almost exact same thing - i'll be riding at constant rpm's and the revs just drop down to idle - it happens more frequently after a bust of speed ie/ accelerate and rev over 10k and then try and keep speed or drop it down a little - revs drop down to 3k and throttle is completely unresponsive. Did cleaning the carbs/fuel filter end up fixing the problem??????
Have a read of these first - they will help immensly. http://fzr250.com/viewtopic.php?t=1487 http://fzr250.com/viewtopic.php?t=673 http://fzr250.com/viewtopic.php?t=1702 If it is not mentioned, also check that the float valves work properly by doing a bench test with fuel supplied via long hose from the running fuel pump as you won't get the supply pressure equall to pump pressure without a tank 3 metres higher than the carbs. Valve adjustments http://fzr250.com/viewtopic.php?t=1597 EXUP adjustment http://fzr250.com/viewtopic.php?t=676 These all need to be good.
Weird, I have almost the same problem. My bike *OCCASIONALLY* starts to fart and splutter when I'm slowing down/stopping for lights and occasionally konks out when I get there. It also does it on occasion when I'm going up the freeway... Very weird. It (a) doesn't do it that often and (b) only seems to do it when I've done > 100km on the tank meaning it's less than half or so full. Last time I pulled it apart I noticed it didnt have a fuel pump..could that be why?
hey man i also have a little carb trouble it seems like two of my jets are blocked and i cant get them out cuz the heads on the jets where the screwdriver is to lock is round off and i have the new ones to put in can anyone give me a solution? <!-- s:cry: --><img src="{SMILIES_PATH}/icon_cry.gif" alt=":cry:" title="Crying or Very sad" /><!-- s:cry: -->
I don't like to say this but you may need to run a small drill up the guts of the jet and use a very small "EZY-OUT" to then unscrew it. The drill and ezy-out would need to smaller dia than the minimum thickness of the jet so that you don't drill out the carb housing where the jet screws into..
Welcome to the FZR250 world, What you have stated are all common problems with this bike. Won't start hot, dies at the lights, fluctuates while riding, and very unreliable. But with hope, know how and a little mechanical skill it can be sorted out. This is what I did to my bike with the same problems expressed by you guys. 1. Clean and balance carbies (10.5-11mm flat distance on float height). 2. Sychronize butterflies. 3. Get new spark plugs. 4. Turn pilot screws to 2 7/8 turns out. 5. Slightly open exup valve. 6. Clean or replace air filter (use hot soapy water, and let it soak). 7. Drill holes in air box on the other side of the intake at the front top half of the air box, 7 1cm holes (this made all the difference, with induction roar). Believe it or not but I have not had any problems with my bike since (6 months), although it took 2 years of frustration and problem solving to figure this out. Although this may not work for you but it has certainly worked for me, and my bike can half die going up steep driveways and pull the clutch in and it goes back to idle as though nothing happened. Best of luck and try what I have suggested.
Good advice there, ive been through this with my bike, After cleaning out the carbies, setting float heights, syncing throttles and setting the needles to the 3rd position (factory i believe) the bike was running like a bag of **** n flooding badly at lower rpm, had the idle mixtures at 2.5turns out, i played around with the idle mixture screw but soon realized it wasn't the cause of my problem. Set the needles one leaner (2nd from the top) with the idle mixture screw at 2 7/8s like you said and now its so much more rideable, am also getting ~200kms to reserve. Alot is in understanding if the bike is running **** cause its too rich or lean and what component is causing the condition. These bikes can be very temperamental but with a bit of persistence they can generally be made good again. This site is very helpful with tuning and troubleshooting the carbies. <!-- m --><a class="postlink" href="http://www.factorypro.com/tech_tuning_procedures/tuning_carbtune,CV,high_rpm_engines.html">http://www.factorypro.com/tech_tuning_p ... gines.html</a><!-- m -->
alrite hear this yesterday i wasriding my bike and the rpm wont pass 7000rpms and wen i put the choke on its runs alot better what might be the cause of that?
Hi Thynel, I take it you have put the new jets (how much, from where) in because this problem sounds jets related. If not remove the assembly that holds the jets to the carby body (this should allow you to get at them more easily). Grab a trusty hacksaw and gentle and carefully try and cut a new grove in them, if not you may have to drill them out. Be extremely carefull when attempting this because if you make a mistake you will instantly be up for $200 for a second hand set of carbies. I am guessing here but at the 7k rmp mark the carbies are now wanting to use the jest that are currently clogged and therefore it can't and won't pass 7k rpm because it needs more fuel to do so. And when you pull the choke on it introduces more fuel to the system and therefore runs a lot better.
alrite natas i will try wat u say a and another thing the other day wen i was riding it sounds like i could hear it sucking hard from the carbs like the filter came off one the carb but wen i check they are all on tight so i was wondering if the rubvers to the top of the carbs are busted what u think
