Topic: 400/500/550 Throttle spring stop

[bryanj]

I have noticed recently that a few people have asked where the throttle return spring hooks onto on the carbs listed.

There is a solid bar fitted between carbs 2&3 and its easy to loose/miss.plus it does not exist on the parts list!

Having just stripped a set of 400 carbs for cleaning i have measured one so you can make one if you lost it.

These sizes are from a cheap digital caliper set

Length. 10.1 mm

Diameter. 5.9 mm

Groove diameter at base. 4.3 mm

Groove width. 1.8 mm

Moderators may wish to move this to a different place but put it here so most people can see

[HondaMan]

I've had to make several of those, too, Bryan. I've variously used parts of (old, used) drill bit shanks, aluminum rod from the hardware store, or smooth the shank of a small bolt (not always a metric one!).

Thanks for the measurements! Next time I'm at my lathe I might just make up a handful of these for the 'lost'.

[bryanj]

You are welcome Mark, just done chains,dampers, rebore etc on a 400 and he wanted the carbs stripped and cleaned, they looked good until i tried to look through the pilots!

[HondaMan]

You are welcome Mark, just done chains,dampers, rebore etc on a 400 and he wanted the carbs stripped and cleaned, they looked good until i tried to look through the pilots!

Doesn't that make you wish you had a set of [labelled] micro-sized metric drill bits?
It does me: I once even bought a 100-drill set that was called "carburetor drill bits", and while they were (are) very tiny, they aren't marked in any way: I had to make a drill bit index up for them, measure each one, and then drill a hole with it to see how big it was. That was a long winter: I've never even used one of them on carbs, either, because when I tried to drill out a corroded-up pilot jet, the bit just broke off inside the hole! Argh...

I need a laser...about 400 watts oughtta do it...