Last time I rode, I had to add about 8 oz of oil. I ridden about 4 hours since then. Checked it again today and it is at the bottom of the stick again. I don't notice any smoke from the engine and nobody complains behind me. I suspect it is leaking out. While replacing the worn front sprocket, I noticed a lot of oil buildup on the case behind the front sprocket. I sprayed it down with brake cleaner and cleaned it up. Going to wait until tomorrow morning to see if there is a stream of oil. If not, I will start it up and check again.

Anyone else suspect an oil leak in this area or had to have any seals replaced?

Thanks...

 

Same thing happened to my Warrior. It sounds like the counter-shaft oil seal. It's only a couple of dollars, and reall easy to replace. =)

 

Thanks for the info. Sure enough I had a wet oily case again this morning. Definitely the seal you mentioned. When I pulled and cleaned the metal bushing that goes around the counter-shaft, I notice two grooves are worn in from where the rubber seal contacts it. Hopefully the new seal will fix the problem without having to replace this bushing.

Thanks again.

 

If it likes other motors (it probably is) then there should also be an oring on the counter shaft sprocket that seals the "metal bushing" on the inside diameter. The outer seal is the one that has the lips that wore the 2 groves you seen. Look at the counter shaft as it gets into the motor and see if the oring is installed or has been damaged. your outer seal may be ok.

 

Thanks for the tip, I did notice that one too. I ordered the outer seal, the inner o-ring, and the collar as Yamaha calls it. Since nobody locally stocks any of this stuff, I figured it was worth the $11.31 for the new collar since I wouldn't want to tear it down another time - you have to give it to Swytak for checking his valve clearances all the time.

I put it all back together for now so I will have to watch the oil level closely until the new parts arrive. I ordered them through Riva on-line.

Everyone else, check your Raptor just to make sure every time you ride. I seem to remember a recent post where a guy seized his engine and discovered no oil left in the oil tank. For the biggest part, I have been pretty lazy about checking it since it is always right where it is supposed to be. I will check it faithfully from now on along with the tire pressure.

 

I can't believe yamaha didn't put in a low oil pressure light...

it has a heat sensor but no oil light.. wtf...

makes no sense to me..

I'm sure one could easily be rigged... just tap into the lower oil supply line back to the oil tank..

Yamaha.. bad move..

 

If your sprocket seal is leaking, be sure to check for blockage in the crank case breather line. It is the 3/8" diameter line connected to the front of the air cleaner lid.

Also, 4oz. oil is alot of oil to leak from the seal and way more oil than you describe as your leak. I have seen a number of these engines that have too much valve stem to guide clearance. The result is oil being sucked into the combustion chamber. I have never seen an oil leaker actually smoke but the amount of oil being burned is not that much.

Take off your intake boots and look down the intake ports. If you find an oily film, there is your problem. Bring it to Yamaha. They, in most cases, will replace the head.

By the way, as of recent, Yamaha has updated the cylinder head to correct this and other problems.

 

about that oil setup u said about and how much would it cost

i would really be interested in it