Post by fugly on Mar 9, 2010 18:49:22 GMT -6
Originally posted by ACR on the old board
After reading & re-reading Damon's "White Paper" articles on carb mods I decided to give this a try. I thought it might be useful to share my experiences & photos with this Board. This will be an ongoing project, I will post new info & pictures as I go. Be sure you read Damon's "White Papers" before trying any of these mods. esp the "Carb Modifications Part 1." Also ANY ONE who has done this please correct or add to the info I've posted.
Standard Disclaimer applyies, I did this & it seems to have come out just fine, but I haven't re-assembled or run my carb/engine. So if you do this it's at your own risk.
Tools needed;
1.Asst. screw drivers,Torx head, etc. tools to remove air horn.
2.Files, abrasives, &/or Dremel tool to remove flashing & modify air horn. I prefer to use files first.
3. Specific files I use are 4" Nicholson six file set w/handles, use chalk on the teeth before cutting. Make sure one of your flat files has a safe edge, (no teeth). I also used artificial or acrylic fingernail files/boards to smooth the file cuts, they work great & come in 100-800 grit. Get these at any Beauty Supply store.
Step 1. Modifying the air horn. Remove the air horn & choke assmb. & locate the areas down inside the air horn where flashing needs to be removed, (flashing is the casting residue left down inside the air horn, like the stuff left on plastic model airplanes, etc).
This is fairly easy to do but requires some skill & patience.
Primaries- Remove the ridge of flashing located about 3/8" down from the threaded rod hole in the center of the carb. The flashing looks like a small weld bead & goes around the inside diameter of the carb, file/sand it down flush. Also in there are two tabs for the choke plate, I removed them since I wasn't using a choke but think you should leave them alone if you are using a choke or aren't sure. Just remember the choke plate & rods are a big obstruction to air flow.
Secondaries- Remove flashing at the bottom inside edges of the air horn, & the flat area in the back side of the secondaries. If you run your finger over the air entry you can feel the roughness. Check your work, after all flashing is removed use 100 & 180 grit emery to smooth cuts. If you're not removing the choke, radius all inside edges of the air horn except the center divider. That ends the first step in "Carb Mods 101".
The next step, if wanted, is to remove the choke horn. You need to think about this & plan the best way for you to get this done depending on the tools & skills you have. For me, this was more demanding & difficult at first, but after I got started it went fairly well. I'll post more in a day or so.
After reading & re-reading Damon's "White Paper" articles on carb mods I decided to give this a try. I thought it might be useful to share my experiences & photos with this Board. This will be an ongoing project, I will post new info & pictures as I go. Be sure you read Damon's "White Papers" before trying any of these mods. esp the "Carb Modifications Part 1." Also ANY ONE who has done this please correct or add to the info I've posted.
Standard Disclaimer applyies, I did this & it seems to have come out just fine, but I haven't re-assembled or run my carb/engine. So if you do this it's at your own risk.
Tools needed;
1.Asst. screw drivers,Torx head, etc. tools to remove air horn.
2.Files, abrasives, &/or Dremel tool to remove flashing & modify air horn. I prefer to use files first.
3. Specific files I use are 4" Nicholson six file set w/handles, use chalk on the teeth before cutting. Make sure one of your flat files has a safe edge, (no teeth). I also used artificial or acrylic fingernail files/boards to smooth the file cuts, they work great & come in 100-800 grit. Get these at any Beauty Supply store.
Step 1. Modifying the air horn. Remove the air horn & choke assmb. & locate the areas down inside the air horn where flashing needs to be removed, (flashing is the casting residue left down inside the air horn, like the stuff left on plastic model airplanes, etc).
This is fairly easy to do but requires some skill & patience.
Primaries- Remove the ridge of flashing located about 3/8" down from the threaded rod hole in the center of the carb. The flashing looks like a small weld bead & goes around the inside diameter of the carb, file/sand it down flush. Also in there are two tabs for the choke plate, I removed them since I wasn't using a choke but think you should leave them alone if you are using a choke or aren't sure. Just remember the choke plate & rods are a big obstruction to air flow.
Secondaries- Remove flashing at the bottom inside edges of the air horn, & the flat area in the back side of the secondaries. If you run your finger over the air entry you can feel the roughness. Check your work, after all flashing is removed use 100 & 180 grit emery to smooth cuts. If you're not removing the choke, radius all inside edges of the air horn except the center divider. That ends the first step in "Carb Mods 101".
The next step, if wanted, is to remove the choke horn. You need to think about this & plan the best way for you to get this done depending on the tools & skills you have. For me, this was more demanding & difficult at first, but after I got started it went fairly well. I'll post more in a day or so.