Quote:
Originally Posted by jkv45
Can you post a photo of how your vacuum hose is attached to the carbs?
As others have mentioned, if it runs fine on "Prime" but not on "On" it suggests an issue with a lack of vacuum or a malfunctioning petcock.
The photo you posted is for a PreGen carb, and yours is a NewGen - so they won't be exactly the same.
You can test that you have vacuum by removing the hose from the petcock and plugging it temporarily. Set the petcock to "Prime". Then start the engine and let it idle. Remove the plug on the vacuum hose and quickly put you finger over it - you should feel a vacuum. If you remove your finger you should hear the engine RPMs change (and air rushing into the hose) and the engine may stall (not a problem).
If you get vacuum there it would suggest the petcock is the problem.
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Tomorrow in the morning i will disarm the bike because i need to go to the school and i post the picture of how is connected the fuel and vacuum hoses.
The problem must be a leack of the vacuum, because i bought another petcock and the bike does the same.