I'm tearing down a clone (Huayi) carb to learn more about the structure and the porting of all the air holes and such and I have a few questions on what I see......
1. I've removed the butterfly and see a little needle like thing sticking out of the side of the throat. if you look down the throat, it's on the right side. looks like it's been covered over with lead or something to make it non-removable. what's this for?
2. on the same side of the throat, there are four small holes...are these part of the air bypass that lets the engine idle?
3. on the right side, one the outside of the case looks like a plug..is this the welsh plug that I've heard about and the one that you don't want to mess with?
4. still looking down the throat on the block side, I see three distinct "cuts"....one is the cut that matches up to the black plastic spacer...the next one is farther inside and it steps down to a smaller size throat...then the final one is smaller yet and it's right in the middle of the carb. I've measure the port at .650, the next step down was at about .620 and the final step down was at about .600...if you are going to enlarge this area, wouldn't it be the same size all the way through?
5. after pulling the low speed jet out, is there a need to do anything with the hole at the bottom? smooth it, enlarge it?
5. how do you remove the choke butterfly?
this is an old carb... and I don't have any use for it (I have five or six others in my race box and two s/a carbs packed away for this coming season. i'm trying to learn all I can about the carb to make me a better builder and more knowledgeable at the track to diagnose problems...
anything that anyone can tell me would be greatly appreciated!
Mike C.
1. I've removed the butterfly and see a little needle like thing sticking out of the side of the throat. if you look down the throat, it's on the right side. looks like it's been covered over with lead or something to make it non-removable. what's this for?
2. on the same side of the throat, there are four small holes...are these part of the air bypass that lets the engine idle?
3. on the right side, one the outside of the case looks like a plug..is this the welsh plug that I've heard about and the one that you don't want to mess with?
4. still looking down the throat on the block side, I see three distinct "cuts"....one is the cut that matches up to the black plastic spacer...the next one is farther inside and it steps down to a smaller size throat...then the final one is smaller yet and it's right in the middle of the carb. I've measure the port at .650, the next step down was at about .620 and the final step down was at about .600...if you are going to enlarge this area, wouldn't it be the same size all the way through?
5. after pulling the low speed jet out, is there a need to do anything with the hole at the bottom? smooth it, enlarge it?
5. how do you remove the choke butterfly?
this is an old carb... and I don't have any use for it (I have five or six others in my race box and two s/a carbs packed away for this coming season. i'm trying to learn all I can about the carb to make me a better builder and more knowledgeable at the track to diagnose problems...
anything that anyone can tell me would be greatly appreciated!
Mike C.