Jayraye39
Well-Known Member
- Local time
- 4:34 PM
- Joined
- Jul 13, 2021
- Messages
- 624
I found a way to bore out the bofeng Carb That does not effect the first 3/4 of throttle response, air/fuel ratio, and will give you a 3mph gain when held wide open..
This mod might not work if your motor is not ported, port matched, and case matched.
Take the stock intake tube bore out the top and bottom opening with a drill bit. the top to 16mm and the bottom match the size to the jug intake port.
Then take the carb turn it upside down and again use a drill bit to start shaving away 1mm of the roof of the throat. make shure to go back and forth slidings through the opening and the exit of the carb. I used and 8mm drill bit.
When your done it should look like a half egg shape at the top all the way through the carb.
Since we did not touch the side walls of the carb or change the shape of the lower 3/4 of the carb bore. We do not lose the venture effect. Their will be very little change in the throttle response and air fuel mixture. If your bike is jetted correctly it will run rich when at WOT.
Once at WOT you will have 1mm of extra air being mixed with the rich fuel to even out the power curve once again.. very liitle tuning required after doing this. All I had to do to fix the idle and overall performance of this mod was to simply sharpen the tip of my carb needle.. this mod will not work if you dont bore out the alum. intake tube to accept the larger itake of air/fuel.
when i ran after the mod my bike topped out at 47 mph when my previouse runs hit a wall at 44mph. when at WOT. If you cant get the slide to uncover the opening all the way. just cut 2 coils off the slide spring then stretch it out a hair. Your welcome and enjoy.
This mod might not work if your motor is not ported, port matched, and case matched.
Take the stock intake tube bore out the top and bottom opening with a drill bit. the top to 16mm and the bottom match the size to the jug intake port.
Then take the carb turn it upside down and again use a drill bit to start shaving away 1mm of the roof of the throat. make shure to go back and forth slidings through the opening and the exit of the carb. I used and 8mm drill bit.
When your done it should look like a half egg shape at the top all the way through the carb.
Since we did not touch the side walls of the carb or change the shape of the lower 3/4 of the carb bore. We do not lose the venture effect. Their will be very little change in the throttle response and air fuel mixture. If your bike is jetted correctly it will run rich when at WOT.
Once at WOT you will have 1mm of extra air being mixed with the rich fuel to even out the power curve once again.. very liitle tuning required after doing this. All I had to do to fix the idle and overall performance of this mod was to simply sharpen the tip of my carb needle.. this mod will not work if you dont bore out the alum. intake tube to accept the larger itake of air/fuel.