Walbro carb
10-23-2007, 10:57 PM
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Walbro carb
Hi guys,
can i substitute my carbs on my BME 50cc engines? I have alot of walbro carbs (6 to be exact). Are they interchangable? Will all walbros work on my BME 50cc engine? Thanks.
John Franklin
can i substitute my carbs on my BME 50cc engines? I have alot of walbro carbs (6 to be exact). Are they interchangable? Will all walbros work on my BME 50cc engine? Thanks.
John Franklin
10-24-2007, 11:04 AM
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RE: Walbro carb
Why not?
As long as there are needles to ajust, the ventury size number is close to the original, and the carb is in working order, they will work. Some better than others, but they will work.
As long as there are needles to ajust, the ventury size number is close to the original, and the carb is in working order, they will work. Some better than others, but they will work.
10-24-2007, 12:46 PM
#3
RE: Walbro carb
As long as the venturi size is close to the one that came with your engine, it should work fine.
The venturi is noted in 64th of an inch or x/64
You can find the venturi size stamped into the throat of the carb. Right down on the opening of the venturi, there will be a small number stamped or cast into the carb throat. This is your size in 64th of an inch.
For example:
If it has a 28 stamped inside, then thats a 28/64 inch opening in the venturi.
If it has a 19, then thats 19/64ths of an inch.
I wouldn't go beyond 3 or 4 64ths up or down on the venturi size. When the carb gets too big, the engine cannot pull enough vacuum through it to make it work right. It will work--but not correctly. It will run up to about 1/2 speed or a little less, but as soon as the engine pulls enough vacuum to open the high speed circuit--it will dump a massive load of fuel into the engine and choke it out. There is no way to adjust the needles down when you have too much carb on the engine. Been there, done that. Waste of time.
Why are you wanting to change carbs? Are you just experimenting? Are you having carb problems with the stock carb?
The venturi is noted in 64th of an inch or x/64
You can find the venturi size stamped into the throat of the carb. Right down on the opening of the venturi, there will be a small number stamped or cast into the carb throat. This is your size in 64th of an inch.
For example:
If it has a 28 stamped inside, then thats a 28/64 inch opening in the venturi.
If it has a 19, then thats 19/64ths of an inch.
I wouldn't go beyond 3 or 4 64ths up or down on the venturi size. When the carb gets too big, the engine cannot pull enough vacuum through it to make it work right. It will work--but not correctly. It will run up to about 1/2 speed or a little less, but as soon as the engine pulls enough vacuum to open the high speed circuit--it will dump a massive load of fuel into the engine and choke it out. There is no way to adjust the needles down when you have too much carb on the engine. Been there, done that. Waste of time.
Why are you wanting to change carbs? Are you just experimenting? Are you having carb problems with the stock carb?
