Primary Chain Yamaha XJ 900f

I was wondering what mileages owners had to change their primary drive chain on the XJ 900f? What are the signs of a worn chain thanks?

 

Never.
It isn't a primary chain. The HYVO chain only spins the alternator, and allows the starter to turn the engine over.
IIRC the chain is (was?) rated by the chain manufacturer to be good for 150,000 miles, but will likely last longer since it has almost no load placed on it.

 

Thanks k-moe here was me thinking it was like my old Honda CB 750 SOHC, how did I manage that? I didn't realize it just drove the alternator etc, I got nothing to be concerned about and that's great.

 

Sometimes k-moe I hear a noise from my engine and I thought it was the aforementioned chain, mabe it is the gearbox but the bike runs perfectly and I have no problems selecting gears and it is not slipping out of gear during acceleration. I know diagnosis of impossible when you cannot hear the bike but do you have any ideas on this thanks?

 

.

So I assume k-moe the large gear on the right of this XJ 900f crankshaft is the primary drive which meshes with a gear on the clutch basket. Are the other two in the middle of the crankshaft for the timing chain and the oil pump drive?

 

The large gear on the right is the primary drive gear.
The small sprocket in the center is for the cam chain.
The larger sprocket at left-center is for the alternator/starter clutch HYVO chain.
The oil pump is driven off of the clutch input shaft (the one that is driven by the primary drive).

 

Cheers k_moe l understand now.

 

A good indicator is the oil spray nozzle being ground down by the primary drive chain slapping against it.
You can pull it out and give it a look without splitting the engine by taking off the gear lever cover and remove the bearing cover where it is located behind... i think... from memory.

 

Good to know the oil spray nozzle can be checked this way cheers cds1984.

 

The oil jet is behind the alternator bearing housing. The alternator rotor has to be removed to get at it, so it's not so simple to check.
The oil nozzle is in no danger unless the alternator chain guide has failed, and that is where pulling the shift cover comes into play. There is a large oil passage under that cover that lets you peek into the transmission and check for broken bits of the guide.

 

Aah now I remember where it is! oops.
Still good indicator I reckon. Although I do like to split engines for the hell of it, it seems.

 

Hi Everyone

Is it correct that Hi Vo chains can only be fitted one way? According to Haynes this is the case with a used chain but does the same apply to a new chain?