Do you need the one way drain valve thingy in the carb rubber or can you just blank it off? Mines now 2 way as it's 50 years old.The gp rubbers don't have them so that's why I'm thinking.
Thanks.
One way valve.
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bristolmod
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depends.......
Originally produced to allow excess fuel to drain away and not "flood" the carb when trying to restart it.. The valve allowed fuel to drain but not allow air in when the engine was running.
Due to cost considerations at Milan, the one way drain was dropped sometime during very early GP production I think.
Hot starting problems can occur, and one of the reasons could be the lack of a drain- you can get round this by punching a very small hole in the bottom of the carb bellows, but although this will allow excess fuel to drain away, it also allows air into the carb when running.
When running standard set ups, I always try to incorporate a one way valve in the correct place ( and make sure the metal plate is the correct way round!!)
Chris
Originally produced to allow excess fuel to drain away and not "flood" the carb when trying to restart it.. The valve allowed fuel to drain but not allow air in when the engine was running.
Due to cost considerations at Milan, the one way drain was dropped sometime during very early GP production I think.
Hot starting problems can occur, and one of the reasons could be the lack of a drain- you can get round this by punching a very small hole in the bottom of the carb bellows, but although this will allow excess fuel to drain away, it also allows air into the carb when running.
When running standard set ups, I always try to incorporate a one way valve in the correct place ( and make sure the metal plate is the correct way round!!)
Chris
Scootering since 1968.