oil on the good foot

[speedlimit85]

looks like oil is coming out of the vacuum advance

[cajun31]

looks like oil is coming out of the vacuum advance

could be the crankshaft seal behind it. part number
93101-32087-00

[bikerphil]

I just did one of these crankshaft seals, it is a real pita getting the old one out. The seal has a lip on it that rides in a groove. You really have to destroy the old seal to remove it, trying not to gouge the aluminum case or scratch the crankshaft. The replacement seals don't have the lip, so installation is a breeze.

[speedlimit85]

Thank you. I'm studying whether this is a job I can do without breaking something or if I should ask the mechanic here.

[bikerphil]

It took me about 30 minutes to get this seal out...

[speedlimit85]

There's a plug with an o-ring. I should try that first. Right under the cover, it might be leaking from there.

[speedlimit85]

O-RING

93210-18319-00

This one?

[Radioguylogs]

O-RING

93210-18319-00

This one?

Your original post said the leak was behind the vacuum advance (left side)

That O-ring goes onto the oil galley plug on the right side.

Edit: Thanks bikerphil for correcting - apparently there is another O-ring on the left side as well

[bikerphil]

Hey Eric...

Yes, there is an O-ring that goes on the left side oil galley plug which is located directly under the ignition cover. The one you listed above is the correct one. It could be the source of your leak, won't hurt trying that first. If you want to save some time and money, go to your local hardware store and ask them for a #14 O-ring which is the proper size. When replacing, take care not to over tighten that plug, they will snap off rather easily, the plug is very cheaply made.

I hope that the O-ring is the problem, that is an easy fix.

[speedlimit85]

You just saved me money and time, but it's the seal.

[bikerphil]

There is one more thing you could try (if you are up for it) before digging out the old seal. If you remove the ignition cover and all the components, you will be looking at the seal. You will notice that the seal has actually shrunk and there is oil around the outside of the seal. Often it is actually leaking around the outer circumference and not the inner part. You can spritz some brake cleaner all around the outside edge to clean the oil away and smear a thin layer of RTV gasket maker around it covering the gap. Overlap it from on the seal itself to the aluminum case, it doesn't have to be pretty. Let it cure overnight. Reassemble the ignition components and hope for the best. I have had success on several bikes with this procedure on both (left and right) crankshaft seals and it has lasted many years before eventually leaking from the center area of the seal.

Good luck on whichever repair you end up doing.

[speedlimit85]

Do you know the o-ring # on the cam chain tensioner bolt?

[bikerphil]

Do you know the o-ring # on the cam chain tensioner bolt?

No, I'm sorry I don't, I've gotten rid of the leaky manual adjust tensioner on all my bikes long ago and upgraded to the auto adjusting type.

Anytime you fool with the cam chain tensioner, be aware the cam chain may skip out of time damaging the engine if you don't do everything exactly right.

[cajun31]

Do you know the o-ring # on the cam chain tensioner bolt?

Yamaha 93210-06632-00 - O-RING | Partzilla.com

I too would highly recommend that you replace the OEM tensioner setup with an older vmax 1200 automatic cam chain tensioner. Install it and basically forget about it for while.

[speedlimit85]

Alright. I'm gonna have to replace the seal or rtv it. Oil on pick up coils. I am told to put a sheetrock screw into the old seal and pull. Any other ways?
But first, how do I start? The timing was factory set with bolts. Mark the timing? Pliers? Hammer in screw grooves? The shop that welded my exhaust won't touch this seal.