tsimnami
New member
In response to the fourth point, yep I screwed that spring up by accident when I was trying to adjust something. I bought a new one the other day but its still revving incredibly high. (First picture is old spring second is new exact part that was installed.I could see part of the problem back in the 2 pictures of you showing how far the black plastic piece returns naturally and when forced.
Firstly: That is indeed the throttle mechanism that controls engine speed.
Secondly: The black plastic Phillips head screw you were turning is indeed the idle adjustment screw. If you backed it out all the way you'd see your low jet stuffed down into the hole that's usually covered up by the screw shank. That's how you replace it, you just pull it out and drop a new one in.
Thirdly: That piece you were showing the return on is supposed to naturally spring return until it's stopped by the tip of the idle screw. That's how the idle is adjusted, screw it in and it prevents the throttle from coming back any further, raising the idle speed. Back that sucker up.
Fourthly: What I saw in those pictures was that thin spring's straight section that hooks onto the throttle under your thumb is bent. All non-coiled parts of the springs should be perfectly straight. Bending that zigzag in it shortens it, prevents throttle from returning properly. It's part of how the governor regulates the throttle no matter how hard you floor it, and it does it with those delicate-looking little springs and such, so any change like bends will screw everything up.
I've cranked the idle screw back pretty much all the way before, but it normally just results in the engine not wanting to run at all. Its also pretty perplexing that the idle speed got worse (3000-5000) without me even touching the screw. Nevertheless I will certainly try again to bring back the idle screw as far as I can.
Hmm, the only chrome screw with a spring I could find is the one in the picture, but I doubt that's the one you're talking about as that only control the max throttle rotation. If this is the case, whereabouts should I look for the screw you mentioned?The throttle looks like it is bouncing back open after you snap it closed. Forget about the black philips screw for a moment. Snug it up and leave it. Find the chrome screw with the spring around it and loosen it up until it no longer touches the spring barely. Start engine and see how it responds. It should not want to idle at all. Unless throttle is pressed. Then run screw back in slowly until idle is achieved. (Chrome with spring around it.)