hay guys i have an fzr3ln 1990 iam suffering from a problem that i need to exchange my spark plugs each time i ride it i recognayzed that the spark plugs are becoming to much dark nd dirt and they are the original japanese ones nd i also recognaized that engine is burning too rich fuel coz at low rev the carbies are flooding alot even when i turn off th eengine nd try to turn it onn after 2 minutes the carbs become flooded with too rich fuel i think combostion with too much fuel and low oxygen amount is the prob which is making the spark plugs blacken nd cozing troubles anyway i know how to balance the oxygen amout but anyone hav an idea how can i fix how i may balance the fuel amount(making it lower ) is it only with the needles of the floats inside the carbs ?? anyway thanks alot bye bye
So i think your asking how to lower the float level of fuel in the carbs... (someone correct me if i'm wrong). I'd recommend checking the level of each of the carbs by using a piece of clear tubing on the drain hole of each carb. If they are inconsistent then you may need to adjust them. You need to remove the metal side of the carbs (not the black plastic rubber side) and then ever so slightly bend the metal 'tabs' to adjust where the floats will rest/close. There may be other things causing your problems though; so if we can run through a quick little checklist it might help you fix your problem. 1. Have you thoroughly cleaned the carbs (with carb cleaner) and blown them out with compressed air? 2. What condition are the needles and jets (emulsion tubes) in? Any detectable wear or change in shape? 3. What notch are the needle's set on? There are 5 notches and each one will dramatically effect how much fuel is being provided by each carb. If you need to lean out the mixture i'd recommend moving the needles to a higher notch (away from the pointy end). Factory settings are for the circlip to be in the middle (# 3 / 5). Try moving it to number 4 in ALL carbs then see how it runs. To get to the needles you need to remove the rubber/plastic side of the carbs and then carefull pull out the slide, rubbers & needles. If you are unfamiliar with carbs then i suggest finding some reading material so you know what each piece does. A quick warning about running a bike leaner than it should; you can do serious damage to the engine if the bike is running lean for any extended period of time.
i had the same problem with my FZR which i recently got back problem was that the shims were too big and weren't getting the proper valve clearance (im not very technical, sorry) so i had them replaced and now bike starts fine, no more flooding... now the engine needs valve seals replaced, but that'll be in winter time when i dont want to freeze to death while riding <!-- s --><img src="{SMILIES_PATH}/icon_smile.gif" alt="" title="Smile" /><!-- s -->
This is happening to my 93 FZR. Its really loading up and dumping too much fuel into the engine. I live at 1,600 ft about sea level which also makes matters worse because of the lower density air.
Good point Foxy. When working with fuelling issues it's always best to ensure the valve clearances are within spec before chasing your tail and attempting to fix a problem that is caused elsewhere. PS. Generally a valve clearance check will cost you ~$100 by the time they've removed the fairings and measured them. If any of the clearances need adjusting you up for ~$250-400 depending on how many need doing and how friendly you are with your mechanic. It's definitely a job that can be done at home but it does require a clean garage and a calm state of mind. <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s -->
