Topic: Transmission gear orientation

[danfr]

I'm reassembling my K4 750 transmission and am having difficulty identifying which way the gears should be facing. The gears I am referring to are #14 and #4 in the photo below (C1 and final drive gear). Any pointers would be very helpful.



I've also noticed a bit of play between the coutershaft and the C1 bushing, part number 5 in the diagram. Is it common for these to wear?

Cheers
Dan

[Don R]

Would a photo of a K2 help? I have one apart in the shop.

[danfr]

Yes please!

My final drive has an L stamped on one side. Not too sure if you can see if yours has a stamp on it.



The C1 gear appears to have a deeper counterbore cut on one side.




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[danfr]

C1 side one:



C1 side two:


I would assume that the shallower side (side two) would face C3 so that the gear dogs are more engaged....? But some photos I've seen on ebay, looks like the deeper side faces C3.


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[Kickstart]

C1 side one:

... this side faces the dogs on the other gear.  You can tell by the rub marks where the dogs were hitting the gear.

[Kickstart]

The trickier part is that #14 gear.

I was fortunate enough to find a clear picture of the gear that I took during the tear-down.

On mine (75 CB750F), that gear has a groove cut around the circumference of the teeth.  That groove is not centered.. and I noticed the groove goes toward the inside of the engine (or towards the bearing that it's next to).   I suspect the K's were the same way.  Check to see if you have that groove.

I've attached a picture... I've added some arrows showing where the groove is... it's hard to see but it's (just) visible in the picture.

[danfr]

Thanks for the replies! C1 is on. Unfortunately, no groove on #14. 

[Kickstart]

Just went through my rebuild pictures... I have a pretty good picture of the side of the gear facing C1 (attached), unfortunately I don't have a picture of the other side.

I'm not sure if both sides of that gear look identical... so I'm not sure how much the picture is going to help you.  Maybe (hopefully) the one side has a shoulder and the other doesn't

[Don R]

I got pics of an F3, my k2 is still in the case and hard to see. On 4 the shiney side is toward the dogs s shown in the pic. 14 appears symmetrical, there is a groove on the outer edge of the teeth but it's centered. Let me upload the pics and see If we can tell anything.

[Don R]

[Don R]

[Don R]

This trans was back cut. I'm sure the gears are in the correct orientation.

[danfr]

I'm not too sure if it helps identifying but I've noticed one side has a much rougher casting...








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[danfr]

Ok, I think I have the final gear sorted out. I found a section in Hondaman's book that speaks of this and there should be a larger gap (2mm) between the two final gears. Also, the side with the L stamped on it has a bit of wear that is the same diameter as the C1 bushing. So I'm going with the L stamp facing in which also gives me the biggest gap between the gears.

Thanks for everyone's help and photos. It is greatly appreciated!!