![]() ![]() I'm thinking if I can get the motor to breath better, and perhaps even use a pipe, the larger carb might be the ticket to a real screamer! I'm considering using a velocity stack and getting rid of the Echo air filter assembly in favor of a K&N setup. On the WT-532, I experimented with removing the choke plate and shaft. I also progressively flowed the airfilter and choke plate on the stock setup to see what the flow restrictions are like with each piece. I machined a new adaptor plate for the flowbench so I can flow carbs, and did a head to head comparison of the WT-424 (Echo GT-2000 carb) to the much larger venturi WT-532. This carb has a simliar body and I can adapt the Echo thottle lever over to it. I dug through the pile-o-carbs and found a Walbro WT-532 (from a Husky XPT 335 chainsaw). I have a stash of misc chainsaw, trimmer, and blower carburetors which I have procured on Ebay, from old equipment, etc. The first thing I decided to do was design and fab up a nice little workstand so I can easily work on the engines. So now I have a nice collection of bottom ends, ignitions, and cylinders to play around with. At the time, I had no idea what that meant, but when I compare the cylinders, I will highlight the differences. One was a SRM-2100 and the other was a GT-2000 "Type 1e" model. These were worn out partially disassembled 21cc engines. In addition I scored two "freebie" engines from my local mower shop. The best part was it had the earlier Zama/Walbro WT-424 carb with adjustable mixture (this engine had the Zama). So I scored an earlier Echo GT2000 powerhead on Ebay (for $10!) and it was in great running condition. Lower risk that way, because if I mess up the modifications, I won't ruin my trimmer (keeps my wife the accountant happier that way). I decided that in order to execute all of the modifications I plan to do, I figured it would be better if I had a second motor to play with.
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