Throttle tensioner ?

[beemuker]

I'm getting to know my new brick, and while adjusting the levers I noticed something missing under the throttle, a threaded hole . looking down [up] it you can see the cable. thinking some kind of tensioner? There was also more slack in the throttle cable than  like, but the adjustment is all the way out. I wrapped a bit of wire to act like a spacer and it worked. I guess a new cable would work, but looking at where it runs, maybe wait until I have to get down there.

[Laitch]

looking down [up] it you can see the cable.

Knowing up from down is overrated and clearly a distraction in this case. Your description is mysterious. A photo would be helpful but I think I know how you feel about photos. :giggles

There is an adjuster and why yours is missing is also a mystery.  Here is one bristling with wrenches. Additionally, are your throttle gear arrows aligned?

[rbm]

Yes, there is a threaded hole in the righthand control set for a throttle tension screw.  It is an M8 x 0.75 all-metal with a nylon-like friction tip and a captive spring.  It was provided on various models at various times over the years.  Part number is  32-72-1-454-414.  Search Motobins for part number 61183.



Early K's had the throttle adjuster halfway down the cable sheathing instead of at the control cluster, as Laitch has illustrated.  Check your bike.

[beemuker]

Knowing up from down is overrated and clearly a distraction in this case. Your description is mysterious. A photo would be helpful but I think I know how you feel about photos. :giggles

There is an adjuster and why yours is missing is also a mystery.  Here is one bristling with wrenches. Additionally, are your throttle gear arrows aligned?


[/quot

The adjuster is maxed out.  I put the "spacer " there to take up more slack.

[beemuker]

Yes, there is a threaded hole in the righthand control set for a throttle tension screw.  It is an M8 x 0.75 all-metal with a nylon-like friction tip and a captive spring.  It was provided on various models at various times over the years.  Part number is  32-72-1-454-414.  Search Motobins for part number 61183.



Early K's had the throttle adjuster halfway down the cable sheathing instead of at the control cluster, as Laitch has illustrated.  Check your bike.

Thanks, that's what's missing. I may seal it up and wait until I need other parts before ordering it.

[Laitch]

What about your gear alignment?

[beemuker]

Thanks, that's what I thought may go there. . I may seal it up and wait until I need other part before ordering it.

[beemuker]

What about your gear alignment?

??? I guess I need a picture, which you seem to be aces at.

[rbm]

There is a master index on this site where you will find links toall the threads that describe service procedures on the K-bike. http://www.motobrick.com/index.php/topic,666.0.html


The throttle adjustment thread is http://www.motobrick.com/index.php/topic,1797.0.html  There is a PDF file linked in the second post in that thread with a procedure for adjusting the throttle, including aligning the gears as Laitch has spoken about.


Always best to try and exhaust your search options before posting, as it is HIGHLY LIKELY that the question has been asked and answered.

[beemuker]

There is a master index on this site where you will find links toall the threads that describe service procedures on the K-bike. http://www.motobrick.com/index.php/topic,666.0.html


The throttle adjustment thread is http://www.motobrick.com/index.php/topic,1797.0.html  There is a PDF file linked in the second post in that thread with a procedure for adjusting the throttle, including aligning the gears as Laitch has spoken about.


Always best to try and exhaust your search options before posting, as it is HIGHLY LIKELY that the question has been asked and answered.

thanks, I read the procedure and  It probably wouldn't hurt to lubricate the throttle gear, , but I think my cable is stretched beyond any adjustment, the little nuts are out as far out as they will go.

[rbm]

I've never heard of a throttle cable streching, but stranger things are possible I guess.  Have you examined the other end where it connects to the TBs to see if that end is correctly installed?

[Martin]

+1 RBM the cable would have to stretch heaps to use up the adjustment available.
Regards Martin.

[beemuker]

I've never heard of a throttle cable streching, but stranger things are possible I guess.  Have you examined the other end where it connects to the TBs to see if that end is correctly installed?

It looks correct, The missing tension screw is probably a contributing factor.

[Laitch]

It looks correct, The missing tension screw is probably a contributing factor.

Doubtful. That screw is used for convenient adjustment of revs. Some use it as a cruise control. Are the arrows lined up?

[beemuker]

Doubtful. That screw is used for convenient adjustment of revs. Some use it as a cruise control. Are the arrows lined up?

I don't know, I'll have a look. thanks

[beemuker]

Thanks, that's what's missing. I may seal it up and wait until I need other parts before ordering it.

Bob's has the part, $10 + 10.40 shipping. anyone have a spare lying around? Otherwise I'll wait until I need to order something else.

[Martin]

As Laitch stated it is not needed check that the marks align. I removed the one on my brick it was too hard to use on the move as a cheap cruise control especially with gloves on. I ended up making my own easier and safer version. http://www.motobrick.com/index.php/topic,7822.msg56073.html#msg56073
Regards Martin.

Throttle Lock 1.png (569.48 kB . 688x516 - viewed 440 times)

[beemuker]

As Laitch stated it is not needed check that the marks align. I removed the one on my brick it was too hard to use on the move as a cheap cruise control especially with gloves on. I ended up making my own easier and safer version. http://www.motobrick.com/index.php/topic,7822.msg56073.html#msg56073
Regards Martin.

I was thinking it would tighten up the loose feeling grip.

[Martin]

When not engaged the throttle action is not impaired. I just use it as a throttle lock at times, but mainly used as a cheap cruise control. I don't use it when cars are in striking range, mainly on long straights to give my throttle hand a rest. It's been on my brick for 15 years plus and it gets used all the time. As stated previously the OEM was hard to use as a cheap cruise control, and not as safe.
Regards Martin.

[lmiklosy]

On some budget model K75s the tensioner hole is plugged with a plastic cap, see pic. Wonder if they tapped the hole?   :dunno
Capital Cycle has the throttle lock screw for $10.49 plus shipping, see eBay.

[kris]

I read somewhere that the BMW wasn't allowed to ship bikes to the US with that screw tensioner in place (don't quote me....I"m losing my mind). My '86 RT does have the screw in and I have used it on a limited basis. It is a pain to work with. Given its layout I'm not sure Beemer ever really wanted anyone to use it.  Hard to believe proud German engineers would come up with a rig like that!

[Laitch]

that the BMW wasn't allowed to ship bikes to the US with that screw tensioner in place

My bike was new stock in the USA. It has the tensioner screw. I'm so lucky! :yippee:
Maybe I'll put it on eBay and buy some chrome tire valve caps with the proceeds.

[lmiklosy]

The throttle tensioner screw goes way back, 90s, 100s, my 90/6 and 1981 R100RS both have them.  Pretty conservative design (maybe German!), corrosion proof, freeze proof. Guess I'm just very familiar with them, I can find mine blindfolded with gloves on, just sayin'. 

[Laitch]

The throttle tensioner screw goes way back, 90s, 100s, my 90/6 and 1981 R100RS both have them. 

Maybe I'll only get one valve cap then. I can always hope for a bidding war.

[alexg]

My K75s from 1993 and the R75/6 from 1975 have one each. Never used them. I have a bad experience with throttle locks in cars, so I do not want to experiment with them on bikes.