KZR's Bikes of the Month for 2024

Throttle Return Spring

More
20 Jun 2021 07:32 #850455 by Jakob
Throttle Return Spring was created by Jakob
Hello,

Just got my a 1983 kz750 Ltd4 a couple months ago, wouldn't start so I cleaned the carbs and she's up and running! Realized after taking it around the block that the throttle hangs open if I don't push it back and there's not enough force on the throttle cable to return back to idle. 

Here's a couple questions:
1. Is it supposed to have a return cable?
        It only came to me with one cable for the throttle. I didn't notice a spot for a return cable connected to the carbs or anywhere to screw one in.
2. Is it possible the return spring is just weak?
        I put some oil down the throttle tube hoping it would help but it didn't seem to really aid my situation. The return spring works, but I have to push the cable back so far before it starts to actually pull it back. I adjusted at both ends but there seems to be some play that I can't get rid of. 

I am hoping I don't have to remove the carbs to get to the spring, but I looked and it looks like I might. Any tips?

Thanks,
Jakob


 

Please Log in or Create an account to join the conversation.

More
20 Jun 2021 12:46 - 20 Jun 2021 12:55 #850479 by TexasKZ
Replied by TexasKZ on topic Throttle Return Spring
If yours is a 1983 H4, then I believe it is supposed to have two cables. However, it should work ok with just one. I think the 750 F1 used a single cable, as did the 1980 H1.
Perhaps your cable is gummed up or fraying. If you are following the proper factory procedure for adjusting the cable, you should easily be able to adjust all of the slack out unless the cable is really stretched. 

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24
Last edit: 20 Jun 2021 12:55 by TexasKZ.
The following user(s) said Thank You: Jakob

Please Log in or Create an account to join the conversation.

  • DoctoRot
  • Offline
  • Sustaining Member
  • Oh, the usual... I bowl, I drive around...
More
20 Jun 2021 14:25 - 20 Jun 2021 14:26 #850484 by DoctoRot
Replied by DoctoRot on topic Throttle Return Spring
I'm not familiar with the H4 but i believe it uses the same carbs as the E1. The spring was super weak on the rack i rebuilt I added a stiffer spring and it solved the issue.
Last edit: 20 Jun 2021 14:26 by DoctoRot.
The following user(s) said Thank You: Jakob

Please Log in or Create an account to join the conversation.

More
20 Jun 2021 20:09 - 21 Jun 2021 05:25 #850507 by Jakob
Replied by Jakob on topic Throttle Return Spring
Thank you so much for the replies. I will check the cable adjustment procedure to make sure I'm doing it correctly and will look into springs. @DoctoRot - which spring did you end up going with? I'm checking online right now for spring and found one on ebay for 40 bucks. I'm hoping I can find something cheaper.

Thanks,
Jakob
Last edit: 21 Jun 2021 05:25 by Jakob. Reason: Accidentally sent two posts instead of one.

Please Log in or Create an account to join the conversation.

  • DoctoRot
  • Offline
  • Sustaining Member
  • Oh, the usual... I bowl, I drive around...
More
21 Jun 2021 09:28 #850528 by DoctoRot
Replied by DoctoRot on topic Throttle Return Spring
I added an extra pin and a spring from the hardware store. It wasn't the most elegant solution but it worked.
The following user(s) said Thank You: Jakob

Please Log in or Create an account to join the conversation.

More
21 Jun 2021 09:33 #850529 by Jakob
Replied by Jakob on topic Throttle Return Spring
Have you guys seen a throttle cable like this? I'm trying to buy a new one and cannot for the life of me find one with that sort of circular lip that comes out just before the curve.
Attachments:

Please Log in or Create an account to join the conversation.

  • SWest
  • Offline
  • Sustaining Member
  • 10 22 2014
More
21 Jun 2021 12:20 #850542 by SWest
The following user(s) said Thank You: Jakob

Please Log in or Create an account to join the conversation.

More
22 Jun 2021 04:38 #850580 by Jakob
Replied by Jakob on topic Throttle Return Spring
Thanks! I'll keep looking around based off of that.

Please Log in or Create an account to join the conversation.

  • SWest
  • Offline
  • Sustaining Member
  • 10 22 2014
More
22 Jun 2021 06:42 #850581 by SWest
Replied by SWest on topic Throttle Return Spring
No eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationLooks like I was wrong. 


Steve
The following user(s) said Thank You: Jakob

Please Log in or Create an account to join the conversation.

More
22 Jun 2021 08:59 #850586 by Jakob
Replied by Jakob on topic Throttle Return Spring
Holy crap that's it! I've been looking like crazy couldn't find it at all. Thanks so very much!

Please Log in or Create an account to join the conversation.

More
22 Jun 2021 09:07 #850587 by Jakob
Replied by Jakob on topic Throttle Return Spring
All right, sorry for being so needy I'm still a newbie, is that cable the push/pull and mine the opposite? 

Trying to find one with threads on the other end.

Here's a pic attached.
Attachments:

Please Log in or Create an account to join the conversation.

  • Scirocco
  • Offline
  • Premium Member
  • Never change a running system
More
22 Jun 2021 13:26 - 22 Jun 2021 13:27 #850597 by Scirocco
Replied by Scirocco on topic Throttle Return Spring

All right, sorry for being so needy I'm still a newbie, is that cable the push/pull and mine the opposite? 

Trying to find one with threads on the other end.

Here's a pic attached.
Your bike/carb/RH throttle is a pull only cable driven. Try to read the part# that is print on. It make the search much easier for all of us.

 

Alternative you can buy a slotted adjustment screw.

 
Last edit: 22 Jun 2021 13:27 by Scirocco.
The following user(s) said Thank You: Jakob

Please Log in or Create an account to join the conversation.

Powered by Kunena Forum

If you like KZR Please consider making a donation. Thank you.

KZRider is free, but not without cost.

Please consider chipping in a few bucks to help cover the cost of running the KZR servers.