07 MTX Reduction Gear Bearing Ok Engine Case Is A Goner

[UP bushman]

Reduction gear removal update on begining of thread.

 

[cannondale27]

Sad and worrisome to hear this.

 

[UP bushman]

Yes it's sad, worrisome, frustrating, angry, and I remind myself it can be fixed some how. There are other things in life we cannot fix like health and family so that helps me. There is very little tolerance in this area due to the force generated to drive the sled. The factory bearing is 1.968" which was what mine was. The dealer even pulled a bearing out of a Phazer motor he had that blew up and that bearing was also 1.968". My dealer is gone to try and find a bearing that is 1.971" and that would work. To normally get this bearing out you need to heat the engine case and use a hammer puller.

I will deffinetly keep everyone up to speed on the progress and eventual repair. To better explain the noise I heard coming from the motor it was like a scratch awl on metal turning in a lathe.

 

[cannondale27]

Thats a good explanation of the sound to listen for.Was the bearing itself still intact and free rolling with no play?

There is sleeves that are available to fix things like this but it requires machining.Was common on old LT500 2str Suzuki motors for the crank bearings to do this and that was the fix.

 

[UP bushman]

The bearings were fine a free rolling and the splines on reduction gear are in great shape. Nothing was in the oil or in the case below the reduction gear. The noise came out around the steering cowling and was fairly noticable. EARLY DETECTION WAS THE KEY and you know what your machine sounds like it's like a pair of underwear you just feel it. I probably only drove it 30 miles with that sound back to the garage before I thought I better investigate.

 

[AKrider]

I've never cared for their clutch reduction gear arrangement simply from the point of view that it added more parts. Bummer to hear about your problem. I looked into buying a Phazer last spring for my daughter adn changed my mind because it didn't seem like the Phazer is as reliable as the other Yamaha 4-strokes. Maybe I'm off base? I don't pay close attention to the Phazer, but I don't have the impression that it uses a high milage engine design.

I've always thought the 500 was pretty high strung to produce 85 HP.

 

[UP bushman]

Hey AKrider keep in mind the Apex and Attack use the same reuction gear system. That does give me some comfort with the load there under and the HP they have not to mention turboed.

 

[cannondale27]

Does the Apex have such a big weight on the reduction gear?

 

[AKrider]

Hey AKrider keep in mind the Apex and Attack use the same reuction gear system. That does give me some comfort with the load there under and the HP they have not to mention turboed.

I remember reading posts when the Phazer first came out that it was not two YZ250F motors but instead two cylinders off the Apex engine. Still, the Apex doesn't make 170 HP, before '11, they were rated at 150 HP. That's 37.5 HP per cylinder instead of the Phazer's 42.5 per cylinder. That doesn't seem like a big difference but Ski-doo's ACE 600 only puts out 60 HP and I bet it lasts a lot longer than the Phazer engine. Plus it is direct drive off the crank like the 3 cylinder Yamaha motor.

For some reason I have a view of the Phazer being high strung to make the power that it does. I'm probably wrong, but I don't recall hearing or reading about very many high milage Phazers. Chances are, I've just not paid attention.

 

[UP bushman]

Does the Apex have such a big weight on the reduction gear?

Hey c27 yes all the 4 cylinder sleds have a big reduction gear on them Apex, Attack and the RX-1. I did a parts search and found something else interesting that they all use the same rear bearing part #93306-27209. These 4 cylinder motors turn at about 10,400-10,900 so the reduction gear is also needed to drop primary clutch rpm. The confidence is building knowing the RX-1 motors have been around awhile and turboed. I beleive now that my engine case must have been machined and was just a bit off.

 

[BombaPolaYama]

I've always thought the 500 was pretty high strung to produce 85 HP.

I believe they are actually 80Hp stock. There are some on here now that have reached 20,000Km if my memory is correct. Mine is at 11,500km. I wondered about the high revs as well, but so far so good.

 

[AKrider]

That's right, I was thinking 85hp for its USCC class. 12,000 miles is pretty good. I'm guessing the high milage numbers may not be as common because the Phazer isn't generally used for high mile touring and long trip rides?

 

[UP bushman]

Dealer nad Corporate Yamaha update on beginning of thead.

 

[yamahas]

Is this a bearing that would need to be serviced like the one behind the secondary and drive shaft?

 

[cannondale27]

No not supposed to need servicing.

I wonder if a combination of peening,Loctite and a pinned bearing would work?