en_fuego
New Member
Hey all, I've been reading through some other posts about this issue, but I'm still having problems. I supervise a crew that's using 6 MS261 saws and we tend to have this recurring issue.
The saw typically runs fine when the chain break is not engaged. However, upon engaging the chain break the saw starts to run poorly. The tone of the engine changes and it begins to run roughly, eventually cutting out. The saw will typically restart easily but dies unless chain break is disengaged.
I used a Tachometer to see if this was really true about the engine sounding different. When the chain break is disengaged it idles fairly smoothly between 2800-2900 RPMs (factory is 2800 low, 14000 high). When ENGAGED, the idle jumps around greatly between 2700-3000 RPMs.
I went through all of the basics:
replaced and lubricated needle bearing
replaced clutch (one of the saws did have a damaged clutch spring, which was replaced and issue persisted. Clutch plate that sits on top of worm gear also replaced in this one because it wore weird due to clutch break)
replaced drum
replaced sprocket
We clean and maintenance our saws EVERY TIME they are used, so this shouldn't be an issue of neglect or user error. This issue has happened across 3 of our 6 saws. We also use 6 MS261 saws when we are working with another organization and it occurred on 1 of these saws as well. When we use our older MS260 saws we have never had an issue like this. These saws are used fairly heavily, around 25-30 hours per week, sometimes more. The only thing I can think of is the carb is possibly dirty. Before I go down that road of removing the carbs on 4 saws I wanted to get some feedback. Thanks!
The saw typically runs fine when the chain break is not engaged. However, upon engaging the chain break the saw starts to run poorly. The tone of the engine changes and it begins to run roughly, eventually cutting out. The saw will typically restart easily but dies unless chain break is disengaged.
I used a Tachometer to see if this was really true about the engine sounding different. When the chain break is disengaged it idles fairly smoothly between 2800-2900 RPMs (factory is 2800 low, 14000 high). When ENGAGED, the idle jumps around greatly between 2700-3000 RPMs.
I went through all of the basics:
replaced and lubricated needle bearing
replaced clutch (one of the saws did have a damaged clutch spring, which was replaced and issue persisted. Clutch plate that sits on top of worm gear also replaced in this one because it wore weird due to clutch break)
replaced drum
replaced sprocket
We clean and maintenance our saws EVERY TIME they are used, so this shouldn't be an issue of neglect or user error. This issue has happened across 3 of our 6 saws. We also use 6 MS261 saws when we are working with another organization and it occurred on 1 of these saws as well. When we use our older MS260 saws we have never had an issue like this. These saws are used fairly heavily, around 25-30 hours per week, sometimes more. The only thing I can think of is the carb is possibly dirty. Before I go down that road of removing the carbs on 4 saws I wanted to get some feedback. Thanks!