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Motorcycle Forum / General / Yamaha / May 2005how do i lean out my carbs on a 1982 750 yamaha seca
I am currently fouling plugs and getting lousy performance with this bike. any help would be great. http://www.dansmc.com/carbs.htm > I am currently fouling plugs and getting lousy performance with this bike. > any help would be great. thanks but I need to know where the adjustment is the site you sent is very good though huh? I found it the first day I had troubles. > http://www.dansmc.com/carbs.htm > >> I am currently fouling plugs and getting lousy performance with this >> bike. >> any help would be great. yup. sorry, but I read your subject line as "CLEAN out my carbs" instead of "LEAN out my carbs". oops. > thanks but I need to know where the adjustment is > the site you sent is very good though huh? [quoted text clipped - 5 lines] >>>bike. >>>any help would be great. How long have you owned the bike and how long since it started to run rich? The reason I ask is because this sounds more serious than an adjustment. When these carbs get dirty and need cleaning, they tend to run lean, not rich! Check the airbox - if a mouse has made a nest in there, it could would cause a rich condition. Have you removed an aftermarket exhaust and put the original back on? Again, if the carbs were properly adjusted with the aftermarket exhaust, it could run rich with a more restrictive exhaust. Are all plugs appearance the same or is one or two fouled? If two are fouled, it could be a coil since each coil operates 2 plugs. Start simple - how long have the plugs been in? If over 1 year, replace them with the plugs that Yamaha recommends and stick with NGK. A previous owner may have installed a colder plug in error. hey thanks, so anyway here's the deal. I bought it after it had been sitting for approximately 6 months. I replaced the plugs with ngk's they fouled in 10 minutes. I pulled the air filter and it was dripping with oil so I cleaned and oiled it and then ensured the oil level is correct. put in the cleaned plugs and 10 minutes later fouled. (dang) so then I took out the air filter cleaned the plugs dumped the old fuel and refilled and..... yep fouled out again. so the plugs when fouled are black and dry. the look like they are covered in black velvet. so I am thinking it is either valve seal or the carbs there isn't any smoke out of the exhaust oh what else yes it has a super trapp exhaust 4 into 1 pipe. I am going crazy. so if you have any more ideas please let me know because I am going to take it to a mechanic on Sunday if I can't at least figure it out. > How long have you owned the bike and how long since it started to run > rich? The reason I ask is because this sounds more serious than an [quoted text clipped - 12 lines] > them with the plugs that Yamaha recommends and stick with NGK. A previous > owner may have installed a colder plug in error. >I am currently fouling plugs and getting lousy performance with this bike. > any help would be great. I am guessing you bought a bike that sat for awhile or YOU let it sit for awhile, Right? You will probably need to rebuild the carbs. Be sure to replace the o-ring seals on the needle seats while you are in there and set the float levels carefully. Use an aerosol carb spray to flush the gunk from EVERY passage in each carb. One thing you can try before pulling the carbs if it is not too late...Put about half a bottle of Chevron Techron fuel system cleaner in a full tank and find a nice long steep hill. Make sure no-one is behind you coming down the hill. Find the speed at which you are about 300 rpm below redline in first gear and go downhill at that speed. Downshift to first and pop the clutch with the throttle closed (be ready for the engine breaking). This will cause a very high intake vacuum which may (if you are lucky) pull the fuel system cleaner all through the carburetor and dissolve the gunk. Repeat about half a dozen times. A couple of years ago this was known as a Gustafson Carb Clean on a Radian owners news group and worked for a number of subscribers there. Try to find a few different hills or be ready to explain your actions to an over-zealous officer of the law. If those o-rings have dried out and cracked, this will not help your situation any. I hope this helps. |
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