rms61moparman
Addicted to ArboristSite
I used the search but couldn't find much on this subject.
How many of you have ported a string trimmer?
Last fall, in a hurry, I purchased a Ryobi BC30 (I think) string trimmer.
It ran great on the sidewalk and did fair if the grass didn't need cutting. If you got into anything thick or tall it would fall on its face and you would have to feed it into the grass REALLY slow.
This past weekend I decided to see if any improvement could be made in its performance. I cut small flathead screwdriver slots in the adjustment screws and fiddled with the carb settings and it really helped, but it still seemed choked down.
Some of you know that I have been trying my hand at some shade tree chainsaw porting so while it was raining this afternoon I thought to myself...."Self, lets tear that trimmer down and open it up a bit and see if it helps it, as much as it does a chainsaw".
When I pulled the muffler on it I could only stare and shake my head. The hole in the end of my....................................................soda straw... is bigger that the exhaust port in that engine was!
I took a few measurements and widened the port about 5-6 mm, smoothed things out a bit, modded the muffler and stuck her back together.
The difference it made in that trimmer was INCREDIBLE!
I would never have believed it if I hadn't done it myself. It sounded real good in the shop so I took it out back and put it into some thick WET fescue and it bogged down a couple hundred rpm and then it felt like a tractor that the governor started opening up on.
The harder I pushed it, the louder it got, and I had to really try hard to stall it.
I know that it will probably find the weakness in the clutch, shaft or gear head before long but until then it is a HORSE.
Now I am anxious for the weather to dry up so I can give it a workout.
Mike
How many of you have ported a string trimmer?
Last fall, in a hurry, I purchased a Ryobi BC30 (I think) string trimmer.
It ran great on the sidewalk and did fair if the grass didn't need cutting. If you got into anything thick or tall it would fall on its face and you would have to feed it into the grass REALLY slow.
This past weekend I decided to see if any improvement could be made in its performance. I cut small flathead screwdriver slots in the adjustment screws and fiddled with the carb settings and it really helped, but it still seemed choked down.
Some of you know that I have been trying my hand at some shade tree chainsaw porting so while it was raining this afternoon I thought to myself...."Self, lets tear that trimmer down and open it up a bit and see if it helps it, as much as it does a chainsaw".
When I pulled the muffler on it I could only stare and shake my head. The hole in the end of my....................................................soda straw... is bigger that the exhaust port in that engine was!
I took a few measurements and widened the port about 5-6 mm, smoothed things out a bit, modded the muffler and stuck her back together.
The difference it made in that trimmer was INCREDIBLE!
I would never have believed it if I hadn't done it myself. It sounded real good in the shop so I took it out back and put it into some thick WET fescue and it bogged down a couple hundred rpm and then it felt like a tractor that the governor started opening up on.
The harder I pushed it, the louder it got, and I had to really try hard to stall it.
I know that it will probably find the weakness in the clutch, shaft or gear head before long but until then it is a HORSE.
Now I am anxious for the weather to dry up so I can give it a workout.
Mike
