I was lucky enough to finally get the new high lift blade for the 21” SP mower after almost 6 months of waiting. The first impressions of the blade are mixed. I took the blade right out of the box and put it on the mower as it came from Ego (without sharpening it). The first thing I noticed about the blade is that it makes the mower spin faster than the standard blade, even under no load. I also noticed that there was a vibration with the blade (which could be the reason for the blade making the mower spin faster). I also noticed that the blade produces much more noise than the standard blade. When I switched back the standard blade the vibration disappeared and the mower spun at the normal speed. I would like Ego to comment if this is normal or if perhaps I have a defective blade. I will be contacting Ego to exchange the blade but don’t know if I will have to wait another 6 months to get the replacement.
I live in Virginia and my lawn is a mix of Kentucky blue grass and fine fescue. I conducted the test at 4:00PM when the grass was dry. While mowing I switched between both blades to accurately compare the performance of both under the same grass conditions. When the mower was set a level 4 there was not much a difference in the vacuum performance between the two blades. However, when I switched it to level 3 there appeared to be an increase in suction with the new blade. It also broke up leaves and twigs slightly better than the standard blade (but is not comparable to the performance Honda). I believe most of the performance difference is due to the increased spin of the blade. The increased spin of the blade also shortened the battery life. Normally I can cut 3⁄4 acre and still have plenty of power left in the 7.5amp battery. The light turned red about 3⁄4 of the way through the lawn. I am fine with the shorter battery life if the performance is better. While the blade is designed to improve bagging performance I also tried it mulching. I am pleased to say that there was an improvement in the mulching performance compared to the standard blade. It still left some residual clippings on the lawn but it appeared to cut the grass more even than the standard blade. I think this was due to the vacuuming of the grass verses “pushing over” blades with the standard blade.
Overall, I am pleased with the performance of the mower with the new blade but am not sure if it is due to the blade itself or the increased RPM of the mower when using the blade. I would love it if there was a way to increase the RPM of the mower with the standard blade to really compare the two blades. I still have a concern about the vibration and if it will potentially damage the mower long term. I would like to hear others have the same issue with the blade or if it just me. I will update this review if/when I am able to get a replacement blade from Ego.