Author Topic: Stiff throttle pull - lighter springs anyone? (Read 6229 times)

74 750K · « **on:** August 06, 2005, 12:29:35 PM »

Yes, this is with new cables, etc. Throttle pull is annoyingly stiff compared to a more modern bike. Just wondering if anyone has sourced/experimented with lighter spring(s) to lighten the pull?

Thank you.

Buffo · « **Reply #1 on:** August 06, 2005, 01:43:48 PM »

You might want to try a new pair of grips with a bigger O.D. first. Leverage.

Did you properly lube the cables?

Don

74 750K · « **Reply #2 on:** August 06, 2005, 01:47:33 PM »

Yes, cables are brand new and everything is lubed/greased properly. Maybe I am picky, but the pull is definitely on the stiff side, and its obvious that its not becuase of binding, but because of the spring tension that you're pulling against. I remember seeing a post or two on this site quite awhile ago when I first got the bike. I searched, and can't find anything on it now.

Buffo · « **Reply #3 on:** August 06, 2005, 01:53:14 PM »

I have a cb750k8 with clubmans, so I had to reroute my cables. NO...it doesnt pull like a 919 but it doesnt handle like one ether..

bigger grips will help a little.

I dont need the springs so i never looked into them...Sorry

Don

falcostan · « **Reply #4 on:** August 06, 2005, 02:37:46 PM »

back off large return spring a couple of turns, worked for me, end of spring may rest against carb body but it is much lighter.

750deepsouth · « **Reply #5 on:** August 06, 2005, 07:28:51 PM »

I played around a lot with various different springs, trying to ease the pull, but couldn't find a happy medium. The spring tension was not a problem at age 20 but at age 50.... $:-\$

eldar · « **Reply #6 on:** August 07, 2005, 10:43:35 AM »

If you have a 2 cable setup, do you need springs? They are for closing the throttle in the event of an emergency but I dont know if they are NEEDED.

74 750K · « **Reply #7 on:** August 07, 2005, 01:40:38 PM »

agree. There are no springs in the carbs tho...maybe I'll just deal with it... Definitely not worth the risk of a stuck throttle.

dusterdude · « **Reply #8 on:** August 08, 2005, 07:04:33 AM »

eldar,i have the same problem with the spring stiffness,yes you need a spring of some kind.i disconnected mine and even with the push cable connected the carbs will not close all the way.im still looking for a good fix to this ir anyone has figured it out i would like to know.thanks

750deepsouth · « **Reply #9 on:** August 08, 2005, 10:14:41 AM »

It's fairly important to have a spring that still pulls the carbs shut with a firm snap. I still have the original spring, coiuldn't find that elusive spring that gave less wrist work yet still shut the carbs firmly.

CB750R · « **Reply #10 on:** August 08, 2005, 10:32:19 AM »

not a solution, but works super well is the throttle rocker, its a piece of plastic that curls around your grip and extends so that your wrist rests on it, like a lever. I went from a VFR, to this bike and couldn't believe the difference in throttle pull, and stiffness. This is an awsome solution for highway riding. in the city I just rotate the thing outa the way, so it is easier to manuver.

eldar · « **Reply #11 on:** August 08, 2005, 01:18:49 PM »

If you anchor down your cables, you have a more positive push/pull. The spring may not be needed then. Again, I would still use the spring but if a person want to experiment, well thats how everthing is done. Maybe anchor the cables and then a lighter spring might work.

Buffo · « **Reply #12 on:** August 08, 2005, 04:39:06 PM »

I only put one twist in my throttle return spring. I dont know how many it was supposed to have. I wouldn't want to ride without a spring. Just not safe.

you should start mastrabating 4 or 5 times a day. That will strengthen your wrist.

Don

eldar · « **Reply #13 on:** August 08, 2005, 05:24:14 PM »

I am not sure if there is a proper smiley face for that comment!

I would not go without a spring either. I only state options if someone decides to experiment.
I think the hard throttle is just a result of 4 carbs. Many newer bikes use 1 maybe 2 carbs.

dusterdude · « **Reply #14 on:** August 09, 2005, 07:24:40 AM »

i dont understand the back off the spring thing,the spring is fixed in its windings,its not adjustable.

eldar · « **Reply #15 on:** August 09, 2005, 11:27:26 AM »

When you pull the carbs completely apart, the spring is a separate piece. When you put it back on, you can kinda set its weight. I think thats how it works. I never did it though.

dusterdude · « **Reply #16 on:** August 09, 2005, 12:47:33 PM »

i would like to hear how to set that.

74 750K · « **Reply #17 on:** August 10, 2005, 03:21:14 PM »

I'm confused by this as well. Are we talking CB750K here? There is only one return spring, that works for the whole assembly. I can't find any adjustment to be had there.

eldar · « **Reply #18 on:** August 10, 2005, 03:24:32 PM »

I dont think it is a "regular" adjustment. You are just winding the spring less to reduce its pull. I think.

Buffo · « **Reply #19 on:** August 10, 2005, 03:55:12 PM »

Eldar is correct. There is no "adjustment" to be made other than (un)winding the single return spring.

I have the 1978 CB750K8. And like I typed "I only put one twist in my throttle return spring.".

Don

Zeke · « **Reply #20 on:** August 10, 2005, 07:21:43 PM »

You guys are lucky.

My 650 has a spring, but it's super stiff and you wind it less than a full turn as it is -- you can't do it any less, or it does nothing.

So, I agree that these bikes are too stiff. Throttle Rocker is a lifesaver on the freeway, but puts hand in an odd position when you need to use brakes. Definately NOT for those twisty downhill roads.

For a replacement spring, you might try mcmaster-carr.

out,

Zeke

dusterdude · « **Reply #21 on:** August 11, 2005, 05:36:49 AM »

zeke,i went to the mcmaster-carr website,the one i found was an industrial supply type outfit.is that the same one?

jotor · « **Reply #22 on:** August 11, 2005, 08:11:49 AM »

Quote from: Zeke on August 10, 2005, 07:21:43 PM

You guys are lucky.

My 650 has a spring, but it's super stiff and you wind it less than a full turn as it is -- you can't do it any less, or it does nothing.

My '82 650 has a very easy throttle pull and the '75 400F is super hard. Everything lubed & routed properly.

TwoTired · « **Reply #23 on:** August 11, 2005, 03:11:36 PM »

I was bored and just stumbled onto this thread.
Most Hardware stores have a selection of springs. Just take yours into the store and select one with the same length but smaller diameter wire.
That's what I did in 75, anyway.

Cheers,

cd811 · « **Reply #24 on:** August 11, 2005, 05:14:14 PM »

I took my stock spring completely off and went to lowes and found a easier spring that still snaps carbs back to idle.

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Author Topic: Stiff throttle pull - lighter springs anyone? (Read 6229 times)

74 750K

Buffo

74 750K

Buffo

falcostan

eldar

74 750K

eldar

Buffo

eldar

eldar

74 750K

eldar

Buffo

cd811