Posted by aloungelizard on April 29, 2005, 10:55 pm
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
> 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.
>
Posted by Paul Gustafson on May 14, 2005, 6:10 am
>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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> 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.
>