We get tons of phone calls about
"My YSR is leaking oil on
the left side, what's wrong?"
This one is simple. 99% of the time there are only TWO reasons for your YSR to leak oil.
1. Transmission has been over filled
2. Clutch push rod seal is leaking
The white arrow on the left side of the
picture points to a small hole. This small hole is the vent to
atmosphere for the gearbox. The hole goes to a channel cut in
the left engine case which acts as a trough for oil to flow.
If you have overfilled, i.e., more than 600cc ( 20 ounces for
those who are metrically impaired ) this is where the extra oil
leaves the sanctity of the gearbox! O.K., I know this sounds
stupid but....do not, repeat, do not fill up that hole with expoxy,
chewing gum, mud, or any other semi-solid goop! We get engines
in all the time where that hole has been blocked off. New seals
all around for those!
So the next question becomes, "How
do I know when I have enough oil in the gearbox? I can't see
it through the filler hole and there is no dipstick!?" All
right now, enough whining, no there is no dipstick, yes Yamaha
supplied a dipstick originally in their fine "tool"
Kit that came with the new YSRs. The dipstick was as useless
as, oh well, never mind. Remove the oil drain plug, drain oil.
Replace oil drain plug. MEASURE 600CC of oil and pour into oil
filler hole on right engine case. Now, if you still leak oil,
we will move onto the second problem.
TCR Recommends Castol GTX 20-50W motor oil. (Remember this is a wet two plate clutch which does not like synthetic oil) Drain oil, measure 600cc (20 ounces) and pour into transmission filler.
The white arrow on the right side of the
picture points to the clutch push rod seal. If your YSR is an
'87 or '88, this seal will leak. Yamaha came out with a factory
mod to combat this. In January 2001, they stopped producing it!
Guess they figured all the leaks had stopped. Not so. All '87s
and most '88s, depending on the manufacture date, will leak oil
from this seal. The seal is not defective, the left engine case
is. So what do we do now that the modification is no longer available?
Put a small amount of silicone around the outside of the seal
to keep it in place. Simple fix!
That's it for now. Shoot me some
E-mail if you have specific
YSR questions and I'll do my best to answer them as time allows,
and/or suggestions for topics in "Tech Tips!" Remember
this page is for you!