Balancer Shaft Alignment

[barber1303]

The picture in the publicly available manual is not very clear. I'm trying to align the balancer shaft and crankshaft, but unfortunately they both indicate a specific tooth instead of a tooth and root. Can someone verify whether this alignment is correct, or whether I have it one tooth off?

 

[MaxMidnight]

You are aligning the mark on the gear with a mark on the crankcase
According to the Service manual (p.3-61):

Be sure the balance shaft gear is aligned so that the dot mark lines up between the triangular timing marks on the upper crank-case when the No. 1piston is at TDC.


1) Balance shaft mark
2)Triangular timing marks

 

[barber1303]

I cannot find that instruction in the manual...are you referencing the Yamaha Factory Service Manual? Here's what I'm seeing:



and from another version of the Yamaha Factory Service Manual:



Unfortunately it's difficult to see the pictures. I was hoping for a tooth and root marked, but I've got two teeth marked, which leaves two potential position.

 

[maleko89]

The mark on the balancer shaft should be on the groove, not the tooth. The mark on the crankshaft is on the tooth.

Cheers.

Mark

 

[barber1303]

Oh, okay...so on closer inspection the "J" mark on the tooth (red arrow) is not the timing mark, but the punch on the gear (green arrow) IS the timing mark?

 

[maleko89]

That could be it. Mine has two dimple marks. One where yours is and on a same line and on the tooth groove.

 

[barber1303]

Thanks for your help!

 

[MaxMidnight]

I cannot find that instruction in the manual...are you referencing the Yamaha Factory Service Manual? Here's what I'm seeing:

Sorry, must have been up before my time...the reference should have been 3-61

 

[one2dmax]

13 teeth is the magic number. You should see the throws as well. See pics. This is from sitting in the upper case half though.