A mate of mine bought a cheap Chinese Baumr-Ag chainsaw, 71cc, and I am going to do some mods on it. He got it new on-line for A$170 and I'm surprised at the quality, it will probably make a pretty good work saw.
It is an open port jug that likely needs more transfer area, but I can't do much about that issue. The muffler has two baffles in it and is going to need a fair bit of work. However, the carb is probably going to give me the most problems.
It is a Chinese copy of a Walbro and when I compare it to an HD that I have it appears to be configured as an HDA. It only has a 15mm venturi.
Does anybody know of an HDA carb that has a 17mm venturi?
If I can find an HDA with a 17mm venturi, I'll redrill it to increase the low end torque (it is quite gutless at the moment).
The piston is 51mm with a 10mm wrist pin - but it has a large DOME shape to it. This piston could possibly be used in other saws to increase the compression. I'll have to get a picture of it.
Anyway, back to the HDA - anybody know of an HDA with a 17mm venturi?
It is an open port jug that likely needs more transfer area, but I can't do much about that issue. The muffler has two baffles in it and is going to need a fair bit of work. However, the carb is probably going to give me the most problems.
It is a Chinese copy of a Walbro and when I compare it to an HD that I have it appears to be configured as an HDA. It only has a 15mm venturi.
Does anybody know of an HDA carb that has a 17mm venturi?
If I can find an HDA with a 17mm venturi, I'll redrill it to increase the low end torque (it is quite gutless at the moment).
The piston is 51mm with a 10mm wrist pin - but it has a large DOME shape to it. This piston could possibly be used in other saws to increase the compression. I'll have to get a picture of it.
Anyway, back to the HDA - anybody know of an HDA with a 17mm venturi?