Hi Folks,
Please advise if this post is in the wrong area.
Relatively inexperienced here. I read a lot and try to make up for my lack of knowledge.
Bottom line: In short, with this carb set-up what are the corresponding metering lever height w.r.t. the bosses in the chamber floor and final L and H settings to maximize torque for this saw.
Story: I picked up an 026 pulled the carb, cleaned it up, new kit, fuel line/filter, plug, air filter, some av buffers, removed, cleaned and reset coil (gap). Impulse line sound. Pulled the muffler and inspected piston (very clean trace of machine marks still present). When I put it all together, I noticed the metering leaver arm was flush with the (I guess you would call them) bosses in the floor of the metering chamber. I assumed this was correct. I have set other carbs flush with the outer edge using steel rule (ie HDB) with no problems. I set the L and H mixture needles at 1 turns out per sticker on the cover of saw. The saw fired up and ran. There is no evidence of air leaks (steady idle and the saw maintains rpm regardless of orientation).
I let the saw warm up, adjusted the L a bit richer approx. 1 1/4 for nice acceleration and left H at 1. Hit the bush and buried it in a log to tune it further. Now this is my first modern higher reving saw, but it struggled. Let's just say a 3400 and a 452vl that I serviced and had on hand as well stomped it. I found after several cuts and adjustments on the H, I was needing to be < 3/4 to get the saw to power through cuts with some degree of authority ( 16" 0.375 b&c in 16" + Douglas Fir). The saw certainly began to wake up when I leaned it out but I stopped at 3/4. I have not willingly advanced to cleaning up scored pistons and cylinders yet.
I am not entirely sure how close to two stroking at WOT that saw should be running out of the cut and how far into four stroking in the cut. I don't have a tach and it is much easier for me by ear to discern the subtle (distinct) sound of the older lower reving saws just cleaning up (and staying clean) in the cut under load and immediately four stroking when lifted off. If the lever height is in fact correct I don't know if it should be optimized at one turn on the H or if the general practice is to lean it out from there.
I pulled the carb as I figured it must be metering rich. I saw this post...
http://www.arboristsite.com/community/threads/walbro-wt-metering-lever-adjust-info-please.177248/
Am I to understand that the meter is to be set 0.06 - 0.07 BELOW the bosses in the chamber floor? The carb does not have the circuit plate like the HDB I am familiar with. I don't have the Walbro tool and have set other carbs a bit lower 0.02" below if they run fat. Perhaps the nub on the new diaphragm is slightly longer and is pushing the lever further than it should?
I just want to get this one ripping.
Thanks in advance - Cory
Please advise if this post is in the wrong area.
Relatively inexperienced here. I read a lot and try to make up for my lack of knowledge.
Bottom line: In short, with this carb set-up what are the corresponding metering lever height w.r.t. the bosses in the chamber floor and final L and H settings to maximize torque for this saw.
Story: I picked up an 026 pulled the carb, cleaned it up, new kit, fuel line/filter, plug, air filter, some av buffers, removed, cleaned and reset coil (gap). Impulse line sound. Pulled the muffler and inspected piston (very clean trace of machine marks still present). When I put it all together, I noticed the metering leaver arm was flush with the (I guess you would call them) bosses in the floor of the metering chamber. I assumed this was correct. I have set other carbs flush with the outer edge using steel rule (ie HDB) with no problems. I set the L and H mixture needles at 1 turns out per sticker on the cover of saw. The saw fired up and ran. There is no evidence of air leaks (steady idle and the saw maintains rpm regardless of orientation).
I let the saw warm up, adjusted the L a bit richer approx. 1 1/4 for nice acceleration and left H at 1. Hit the bush and buried it in a log to tune it further. Now this is my first modern higher reving saw, but it struggled. Let's just say a 3400 and a 452vl that I serviced and had on hand as well stomped it. I found after several cuts and adjustments on the H, I was needing to be < 3/4 to get the saw to power through cuts with some degree of authority ( 16" 0.375 b&c in 16" + Douglas Fir). The saw certainly began to wake up when I leaned it out but I stopped at 3/4. I have not willingly advanced to cleaning up scored pistons and cylinders yet.
I am not entirely sure how close to two stroking at WOT that saw should be running out of the cut and how far into four stroking in the cut. I don't have a tach and it is much easier for me by ear to discern the subtle (distinct) sound of the older lower reving saws just cleaning up (and staying clean) in the cut under load and immediately four stroking when lifted off. If the lever height is in fact correct I don't know if it should be optimized at one turn on the H or if the general practice is to lean it out from there.
I pulled the carb as I figured it must be metering rich. I saw this post...
http://www.arboristsite.com/community/threads/walbro-wt-metering-lever-adjust-info-please.177248/
Am I to understand that the meter is to be set 0.06 - 0.07 BELOW the bosses in the chamber floor? The carb does not have the circuit plate like the HDB I am familiar with. I don't have the Walbro tool and have set other carbs a bit lower 0.02" below if they run fat. Perhaps the nub on the new diaphragm is slightly longer and is pushing the lever further than it should?
I just want to get this one ripping.
Thanks in advance - Cory