Honda Twins banner
Cancel

Throttle Issue 1979 cm400t

352 Views 7 Replies 3 Participants Last post by  3hunner, 
mcolley
Hi everyone,

Back after a long hiatus. Finally got a stator to make this guy start but after taking apart the carbs and replacing pretty much everything I’m stuck at a throttle issue.
I put the bike back together but it seems the throttle won’t snap back. This is without the cables on. Im afraid I might’ve done something to the throttle when I was cleaning and replacing gaskets in the carbs? I’ve cleaned out the area around it with a parts dip and carb cleaner and still nothing.
Art Motor vehicle Paint Machine Revolver

Any help would be appreciated.
See less See more
Reply
Save
Like
1 - 8 of 8 Posts
B
Hard to tell from a single photo . Find a Honda Service Manual on line and look at how the carbs are connected together . The return spring is mounted on one of the carbs and works both carbs when they are connected. Its not shown on a parts dia that I can find so you will need a manual.

Bill H
Reply
Save
Like
3
Your spring positioning may be off…something is definitely off if they are not snapping back. Might want to slowly work backwards and see where you could have gone wrong. Watch some carb assembly videos pertaining to your bike as well.
Reply
Save
Like
mcolley
Yeah really not sure what I could’ve done as I didn’t touch the throttle. It was mostly replacing gaskets.
I’ve attached a GIF of the rotating body.GIF HERE
Reply
Save
Like
3
Hmmm that’s strange, is something catching on the butterfly inside the carb? May need to pull that shaft out to inspect it further.
Reply
Save
Like
B
Tried to send an image of the return spring but unable to do so. PM me your e-mail and I will send it to you.

Bill H
Reply
Save
Like
  • Helpful
Reactions: 1
mcolley
3hunner said:
Hmmm that’s strange, is something catching on the butterfly inside the carb? May need to pull that shaft out to inspect it further.
Click to expand...
Yeah actually pulled the shaft out and there was some varnish at the very end that was pretty much gum. Snaps back just right now.

thanks for the help! Let’s see if thing will run now.
Reply
Save
Like
  • Like
Reactions: 1
3
Awesome! Glad you got it. Keep us posted on the bike!
Reply
Save
Like
1 - 8 of 8 Posts
Honda Twins
A forum community dedicated to Honda Twin cylinder motorcycle owners and enthusiasts. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more!
Full Forum Listing
Explore Our Forums
Project Logs Engine Discussion Member Introductions Engine Discussion Electrical Discussion
Top