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Throttle tube freeplay
Throttle tube freeplay
Also, I found this page explaining how to adjust the freeplay and synch the cables to the carbs. Thoughts?
https://w6rec.com/bmw-motorcycle-contro ... placement/
Tommy
1967 R69s + a bunch of Ducatis
Re: Throttle tube freeplay
1/2" is way too much play. Photo #15 in your link show the two large gears at the end of both the throttle tube and the cable end (chain). The "relationship" of those two gears determine the amount of slack in the cable.
Take the cover off the throttle housing and look at how those aforementioned gears work together. Basically - what you are trying to do is take slack out of the chain by resetting when the two gears start working together. Lift the gear with the chain attached high enough to turn the throttle tube to a new position where it will engage the chain/cable sooner than it was previously. Hard to explain this, but hopefully it will make sense when you see the two gears working together.
Re: Throttle tube freeplay
Tommy
1967 R69s + a bunch of Ducatis
- vechorik1373
- Posts: 268
- Joined: Fri Oct 27, 2006 3:00 am
- Been thanked: 25 times
Re: Throttle tube freeplay
1. rotate the grip toward the open position, until you feel all the slop come out.
2. remove the screw that holds the P shaped lid over the gear.
3. Raise the lid, not all the way off, but just enough that when you pull outward on the grip, it moves away from the perch
4. While the grip is disengaged from the gear, rotate the grip toward the closed position, and while still holding the lid up, push the tube back on the handlebar. If you did not rotate it too far, it will go back in, and you will be able to push the lid back down. Put the screw back in.
You see, the lid has a blade near the end, that fits down inside a slot, of the throttle tube. That blade keeps the grip from coming out and off. The slot is of a certain length. You have to "time" the grip tube so when it is re inserted, into the gear, the blade of the lid will go down in the slot and leave very little rotational slack.
Technical Adviser, Former owner, Bench Mark Works
662 312 2838 cell 9 am to 4pm CST PLEASE!
Re: Throttle tube freeplay
THANK YOU! So doing this procedure I wont need to do the cable "synching" to the carbs as described in the link in the my original post?vechorik1373 wrote: ↑Fri Sep 16, 2022 10:40 amTry this procedure:
1. rotate the grip toward the open position, until you feel all the slop come out.
2. remove the screw that holds the P shaped lid over the gear.
3. Raise the lid, not all the way off, but just enough that when you pull outward on the grip, it moves away from the perch
4. While the grip is disengaged from the gear, rotate the grip toward the closed position, and while still holding the lid up, push the tube back on the handlebar. If you did not rotate it too far, it will go back in, and you will be able to push the lid back down. Put the screw back in.
You see, the lid has a blade near the end, that fits down inside a slot, of the throttle tube. That blade keeps the grip from coming out and off. The slot is of a certain length. You have to "time" the grip tube so when it is re inserted, into the gear, the blade of the lid will go down in the slot and leave very little rotational slack.
Tommy
1967 R69s + a bunch of Ducatis
Re: Throttle tube freeplay
If you move the point of meeting, replace the P cover, open the throttle to maximum and look at the carb intakes, you may find the throttles don't open to maximum. Unless you're racing, this probably won't matter.
On the post-1970 bikes, it was a way of getting more use from the parts, at the expense of top speed, as the gears tended to wear most at small throttle openings.
Balancing the cables is a further operation. Plenty of fun here.
Charlie.
- vechorik1373
- Posts: 268
- Joined: Fri Oct 27, 2006 3:00 am
- Been thanked: 25 times
Re: Throttle tube freeplay
Technical Adviser, Former owner, Bench Mark Works
662 312 2838 cell 9 am to 4pm CST PLEASE!
Re: Throttle tube freeplay
Tommy
1967 R69s + a bunch of Ducatis
Re: Throttle tube freeplay
Dave
Re: Throttle tube freeplay
Agreed, I will add that to the growing list of things I need to check out and learn about this bike. Fun!
Tommy
1967 R69s + a bunch of Ducatis