As I was sitting there looking at the metering spring that I thought I'd lost for the Walbro HDC carb I'd been working on,a thought occurred to me that the metering spring looked awfully familiar.I might be wrong about this,but it looks a lot like the springs used in the old Zippo lighters & possibly the Bic or Cricket disposable lighters.I don't have any on hand to dissect.The lighters'springs might be just a bit too heavy?
Post by onlyhomelites on Mar 13, 2018 20:55:33 GMT -5
Walbro still sells replacement springs for quite cheap...there's a downloadable catalog on their website. I just ordered several different part#'s to keep on hand for shop use. I paid about $1 a spring by ordering 10 at a time.
The amount of spring tension on the lever is important. I don't know that you would be able to substitute the spring easily. Kart racers will keep a selection of various tensions of lever springs to adjust the pop off pressure of the needle when they pressurize the fuel inlet. Usually 10-12 psi for gas carbs.
Post by onlyhomelites on Mar 14, 2018 21:22:21 GMT -5
Sooner or later, I'll add some of the common ones to my website. The problem is there isn't one consistent spring throughout a carb series; the HDC uses 2 or 3 different ones, depending on the carb. It'll take more time than I have right now to map it all out, but I'll get to it ASAP.
I'm not sure about Tillotson...the catalogs I've come across do not have a separate listing for the springs that corresponds to a model#. So I'll have to dig through individual carburetor IPL's (where available).