i've got a jiffy/30... the previous owner had the carb replaced with one which has all metal internal components, told me the original carb has got plastic adjustment screws which deteriorate over time if the auger isn't stored properly during the summer months. what happens is while drilling, as soon as my auger hits the power band it falls on it's face...i have to drill slow and steady.guessing it's just a carb adjustment, but it stills beats the hell outta chiseling!!
-i'm hesitant to mess with the needle, my brother-in-law messed with his and it's never been the same!
Here is my take on it, for what it may be worth... depending on the age, it may not have an OEM carb on that thing, or at a minimum, it was not rebuilt with OEM parts. Got pics? if its an older auger, it should have a walbro carburator. If its a new 30, it may not be - just dont know about the newer ones. (ok, so if it has the limited 'plastic' adjusters it's a newer one, and as XJMA states, it's just the cap that's plastic.) I doubt it has plastic jets and if it does, rebuild the carb with an OEM kit.. Use ALL the parts in the kit! One thing that is critically important to these carbs, is because the journals are so small, when you tear them down, they need to soak (submerged) in parts cleaner at least overnight (you can buy a gallon with the basket at any auto store). By simply tearing them down and "blowing them out", it's not enough. while your at it, flush the tank. There is a little screen in the tank where the line exits it. douch the tank with brake cleaner and spray through the line connector as well.
If all this is done (and yes, it's a risk) and the thing still runs like crap and you can't get good hi/lo adjustments out of it, then the journals are actually corroded (the result of water in the ethenol) and you should take all the rebuild parts out, put them on the shelf, and go buy a new walbro carb... they are not that bad, around 50 bucks.
75 bucks XJ? really? I'll up that bid in a heart beat
Big scott, I don't know where you live, but I'd be happy to dial this thing in for you, for the cost of parts, and a nice SM scotch to drink while doing it!
Only condition is, I need it for the time it takes to get the parts...once parts are in, it can be done in a couple days... (need 24 hours just to soak if it's a rebuild).
Sounds like your ok with it the way it is for the season... so... at Ice out time, talk to me...
That's my story and I'm stickin to it!