FergusonTO35
Here For The Long Haul!
- Local time
- 6:28 AM
- User ID
- 3545
- Joined
- Jul 9, 2017
- Messages
- 5,537
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- Location
- Boonesborough, KY

I have an Echo SRM-225 weedeater about 6 years old that I like very much. I've removed the plug over the mixture screw and always kept it tuned to where the four stroking just cleans up at WOT and produces that smooth as glass whine characteristic of Japanese two strokes.
Anyhow, I put the tach on it for the first time and found that I am actually exceeding the factory RPM by quite a bit. The maximum rpm given in the manual is 7600-8700. I'm doing around 9400. I tried richening it and did get the rpm down, however with noticeable four stroking and it doesn't cut as well. Anyway, if you hold it at WOT the rpms will continue to build until it starts to bounce off the rev limiter.
So, what should I do? Should I try to keep it within the recommended RPM range? Or, leave it at the higher setting since this has always worked well? I'm using 93 octane gas with fuel stabilizer and VP synthetic oil at 36:1.
Anyhow, I put the tach on it for the first time and found that I am actually exceeding the factory RPM by quite a bit. The maximum rpm given in the manual is 7600-8700. I'm doing around 9400. I tried richening it and did get the rpm down, however with noticeable four stroking and it doesn't cut as well. Anyway, if you hold it at WOT the rpms will continue to build until it starts to bounce off the rev limiter.
So, what should I do? Should I try to keep it within the recommended RPM range? Or, leave it at the higher setting since this has always worked well? I'm using 93 octane gas with fuel stabilizer and VP synthetic oil at 36:1.