HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
MikeOK

Whay a push and a pull on the throttle cable?

7 posts in this topic

I am just wondering, why do we need a return (push) cable on our throttles? It looks to me like we just need a pull??

Mike

Share this post


Link to post
Share on other sites

Apparently the four strokes generate alot of vacuum and would need a really beefy return spring with just a pull cable.

Share this post


Link to post
Share on other sites

Just to add to Mike’s post, apparently it is possible for the slide to “surf” on the intake flow at WFO and this vacuum effect could in some cases not be overcome by your standard strength return spring. And that would be scary. I discovered on my KX 500 on one occasion that the kill button isn’t very effective when the motor is at redline (I also learned that proper throttle cable routing is an important thing on a KX 500).

Therefore on the FCR the “push” cable actually pulls the slide down when you twist the throttle back to the off (idle) position.

Share this post


Link to post
Share on other sites

If ya wanted to research it, you'd find that just about every fourstroke around over 350cc has a push/pull throttle and have for years. Save some of the old BSA's Triumps and those ilk. They used springs good enough to hold up the fork for a return though

Share this post


Link to post
Share on other sites

The slide getting stuck due to air flow is interesting I never thought of that. I always thought that it was safety in case the cable got frayed causing a stuck slide or something similar. I have never looked on the 2-strokes, do they not have double cables on most 250+ cc 2-strokes?

Share this post


Link to post
Share on other sites
Originally posted by sirthumpalot:

I have never looked on the 2-strokes, do they not have double cables on most 250+ cc 2-strokes?

I’ve never seen one. My KX 500 just has one cable, heck it may even be the same carb as some of the older, non-power jet 250s (39 mm PWK??).

I wish it did have a pull cable. I almost rode the thing WFO from the garage into my roommate’s bedroom when the throttle stuck on me. :)

Share this post


Link to post
Share on other sites

A fairly common problem with the DRZ's is that the return cable frays and then breaks. Most everyone that has had that happen has run with just the pull cable. I only remember one person having a problem that may have been related to missing the return cable and that was in VERY cold weather. Don't remember the exact problem. Do a search on the DRZ forum to find it.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0