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1979 CX500
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Discussion Starter #1
So there’s some slack in my throttle cable, it doesn’t spring back into place very strongly without my pushing on it a little bit. I adjusted the throttle housing/kill switch box and it helped a little bit, but I noticed the screws that hold the housing together are starting to get a little stripped.
I need to do more work on the throttle cable, but I want to replace those screws to make sure that they don’t strip as I take them off and back on.
Anyone know the thread pitch/length of the two screws, or where I could order some new ones?
Thanks
 

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By stripping are you referring to the cross slot where the screw driver engages or to the threads on the fastener? Are you aware that these are not phillips type fasteners, but are instead JIS? Use of a phillips can lead to stripping of the slot.
 

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Discussion Starter #3
By stripping are you referring to the cross slot where the screw driver engages or to the threads on the fastener? Are you aware that these are not phillips type fasteners, but are instead JIS? Use of a phillips can lead to stripping of the slot.
Yeah, I’m talking about the cross slots on the head. Looks like the previous owner probably used a Phillips screwdriver and the head is starting to strip. Trying to source some new screws to replace them.
 

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Discussion Starter #5

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They are standard metric screws and Partzilla charges way too much for them. You might save some time & money looking for the replacements at a good local hardware store that carries metric hardware.

BTW: The usual cause of the twistgrip not returning is a gummed up cable, most commonly the so-called "push" cable. It's job is to let you use the twistgrip to pull the throttle closed if the throttle return spring fails; In 20 years on this forum and it's predecessors I've never heard of that happening and I've heard of many cases of that cable causing more problems than it could ever solve so I always recommend eliminating it.
 

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The screws are M5. I am rebuilding a couple of sets of switches at the moment but don't have the hardware {have ordered 30 of 35 mm ones and will cut to length ... when they arrive}

I'll take some measurements tomorrow as I'll be needing to anyway.

There appears to be three lengths.
 

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1979 CX500
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Discussion Starter #8
They are standard metric screws and Partzilla charges way too much for them. You might save some time & money looking for the replacements at a good local hardware store that carries metric hardware.

BTW: The usual cause of the twistgrip not returning is a gummed up cable, most commonly the so-called "push" cable. It's job is to let you use the twistgrip to pull the throttle closed if the throttle return spring fails; In 20 years on this forum and it's predecessors I've never heard of that happening and I've heard of many cases of that cable causing more problems than it could ever solve so I always recommend eliminating it.
You’re definitely right about the cost, it ended up being about $10 with shipping for the two screws, but I wanted to get them ordered as I was heading out to the field and didn’t have time to hit up a hardware store. When I get out of the field in a week or so I’ll do some more probing with the throttle cable to try and get that issue resolved, a stuck throttle cable is the last thing I’d need as a new rider. Thanks for the advice
 

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The cable that actually does something (pulling the throttle open) rarely causes any problems (the only time I've ever needed to replace one was on the winter bike because of rust - everything rusts on the winter machine). It's the one that isn't doing anything that causes the problems....
 

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The throttle can hang up if the cables are not routed properly. Check the routing diagrams in the factory service manual.
 

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A cheaper source for metric screws might be To find a T.V. installer I have bags of various screws from the wall mounting kits. Helped a buddy doing Casinos TV screens , after a while just threw the bags in the recycling bin. Had so many.cheers
 
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