RED-85-Z51
Addicted to ArboristSite
Im so sick of these carbs, seems like I see them more and more as we near CARB Tier 3 standards...
Most work perfectly, never a problem, but let it get a little stale fuel, and they ALL do the same crap.
Primer gets very hard, hard to push iin, lots of pressure...sometimes comes out ery slowly too.
Starts on choke ,but when revved falls on its face, some will idle perfectly.
Putting in a kit, or a new diaphragm generally makes them run to some extent but they seems to want to lean out up top. Ive had luck raising the metering lever on a few but generally they just lean out.
Ive replaced the rotary part, the purge bulb plate, and a full kit, with no change on them.
I know you can remove the plastic plug on the flat side of the carb flush with the purge plate, and access a small adjustment screw, but many have nothing under that plug but a jet.
I know some have a small adjustment needle in the center pivot of the rotory part, under a brass plug...but most have nothing, and removing the plug is a PITA...
Im at my wits end...I can play with them sometimes and get them right on the bench but they come back nearly every time within a week running like crap again, and I always end up having to replace the carb...
Inversely...where is the cheapest source for RB-K70 and RB K75A type carbs? It's easier to explain to a customer that theri 200 dollar trimmer needs a 45 dollar carb, than it is an 85 dollar carb.
Most work perfectly, never a problem, but let it get a little stale fuel, and they ALL do the same crap.
Primer gets very hard, hard to push iin, lots of pressure...sometimes comes out ery slowly too.
Starts on choke ,but when revved falls on its face, some will idle perfectly.
Putting in a kit, or a new diaphragm generally makes them run to some extent but they seems to want to lean out up top. Ive had luck raising the metering lever on a few but generally they just lean out.
Ive replaced the rotary part, the purge bulb plate, and a full kit, with no change on them.
I know you can remove the plastic plug on the flat side of the carb flush with the purge plate, and access a small adjustment screw, but many have nothing under that plug but a jet.
I know some have a small adjustment needle in the center pivot of the rotory part, under a brass plug...but most have nothing, and removing the plug is a PITA...
Im at my wits end...I can play with them sometimes and get them right on the bench but they come back nearly every time within a week running like crap again, and I always end up having to replace the carb...
Inversely...where is the cheapest source for RB-K70 and RB K75A type carbs? It's easier to explain to a customer that theri 200 dollar trimmer needs a 45 dollar carb, than it is an 85 dollar carb.