What is the Purpose of the White Plastic Roller on the Start Lever Shaft?

[Bob K.]

I'm baffled. Consensus says I have the primary throttle cable routed incorrectly on my '93. It's not supposed to go around the white plastic roller/bearing on the starter lever shaft. Instead, the throttle cable is supposed to go on the inside of the starter lever shaft and directly to the throttle linkage. The angle of the throttle cable bracket does seem to support that idea in that it points toward the throttle linkage rather than toward the plastic roller.

 

Yet when I look at this area, I can't see anything that would then touch the plastic roller, so what is its purpose? It's not needed to position the starter lever shaft or hold anything in place on the starter lever shaft. Is it a vestigial remnant of some sort? I don't want to reassemble any further until I'm positive I've got everything back where it's supposed to go.

[Prairiehammer]

I confess that I don't know the "why", but I do know the "where" is behind the plastic roller. I think that Marcarl's explanation of that plastic roller being a spacer is valid. Perhaps, in some situations the throttle cable MAY touch the enricheners actuation shaft and so Yamaha did a "CYA" to prevent unexpected throttle sticking?

[uhfradarwill]

That part is very critical to the safe operation of the motorcycle in the event a major CME, Coronal Mass Ejection, hits the earth.

Normally our planet's magnetic field shields us from much of this energy but if the field fails, btw it is reversing so manual compass will point South at some point, the special material this "spacer" is made from will be immune to the effects of the major cosmic rays it will be exposed to and thus will not WOT unexpectedly.

Will:smile5:

[Patch]

That part is very critical to the safe operation of the motorcycle in the event a major CME, Coronal Mass Ejection, hits the earth.

Normally our planet's magnetic field shields us from much of this energy but if the field fails, btw it is reversing so manual compass will point South at some point, the special material this "spacer" is made from will be immune to the effects of the major cosmic rays it will be exposed to and thus will not WOT unexpectedly.

Will:smile5:

 

Will, more sleep less polishing chemicals

 

It is a position guide for the cable to cradle!

[Bob K.]

It is a position guide for the cable to cradle!

Steve--Are you being humorous or serious? Explain further, please. My throttle cable, when routed correctly inside the shaft, would never have enough slack in it to even come close to touching the white plastic roller. By the manual, Throttle Cable #3 is only supposed to have 1-2 mm of free play. Weird stuff. Those original designers need to be interrogated under a bright light!

[Patch]

Steve--Are you being humorous or serious? Explain further, please. My throttle cable, when routed correctly inside the shaft, would never have enough slack in it to even come close to touching the white plastic roller. By the manual, Throttle Cable #3 is only supposed to have 1-2 mm of free play. Weird stuff. Those original designers need to be interrogated under a bright light!

 

Yes I am but as you say it doesn't really do much, still a good principle.

 

So you can always count on Pairriehammer to not guess.

 

Take a look at 3-3 bottom left hand of the page,,, you clearly see the nylon bushing without interruption of the cable.

 

Page 5-1 item 23 backs what Carl describes.

 

So what can happen is when you snap the throttle back, its hot in that area potentially it can move away enough to snag So because this is a throttle cable their is still a practice of protecting and if possible completely eliminate any risk to limiting a free expected smooth operation of,,, period.

 

Patch;)

[Patch]

I'll just add Bob that when the throttle is working correctly then everything is as is expected, but this is a cruise control rig and there is a splitter an added complexity. On another bike I have I had to replace the short cable from the cruise splitter it was well documented in the manual not so much in the Venture manual but is showing if you look carefully.

 

Page 1-157 item 14

[uhfradarwill]

Will, more sleep less polishing chemicals

 

It is a position guide for the cable to cradle!

 

Ok, will do Steven, but I was serious about the Earths magnetic field flipping. Leading scientists predict within 50 years it will happen.

Will

[Patch]

"Leading scientists predict within 50 years it will happen.

Will"

 

 

I'll wait, but will let the boys know its expected;) funny guy

[Prairiehammer]

I'll just add Bob that when the throttle is working correctly then everything is as is expected, but this is a cruise control rig and there is a splitter an added complexity.

 

Steven may have hit on the reason for the roller, kinda. Perhaps during cruise control operation, the servo introduces slack in the throttle cable and the roller is to make sure that there is no interference with the enrichener/starter/"choke" actuating shaft?

 

Note that on the nearly identical V-Max carbs, the same actuating shaft has the grooves for the circlips (that locate the roller), but the circlips and roller are not used or needed. Why? Because the V-Max does not have cruise control?

 

(Ignore the red arrow in the photo, it is not relevant to this discussion.)

 

[Patch]

Yes when I was looking up the pages and item numbers I simply forgot to include it, likely because it was at the end of the book.

 

The cruise splitter pulley and pin can ware as well which can if the ID. goes out of round example, will generate some slack. Not a complaint we hear about on these bikes to my knowledge. Also not an item we ever recommend lubing.hmm

Perhaps not servicing this part may be for the better verses the risk of messing it up? I wonder..