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John.. Take a look back in the postings and you will find a lot of info. on the GL1500's for performance quirks.. The engines are very strong and should last for a long time.. However, if memory serves me, the carbs are another story.. One of the postings mentioned that the metal they are cast from is pourous and once the outer plating wears away, the cast metal begins to disintegrate. This is especially true around the throttle shaft bores. Once the shaft bores wear, it creates a lean mixture in cruise which is not evident at lower gear settings. Once you are infinalgear, the cruise circuit in the carburetor comes into action and the mixture is controlled by the diaphram and needle sitting in the fuelcontrol cylinder. If there is too much ouside air pulled in past the throttle plates, the vacuum pressure drops and the diaphram is not sucked (pardon the word) down low enough to produce a richer mixture.. Hence, the flat spot you are experiencing. There is sometimes a back-fire experienced in that split second where the mixture is too lean, itis delayed in firingand the intake valve has not completely closed yet.

May I suggest balancing the carbs first, and go over all the maintenance requirements needed at that mileage. Inspect the spark plugs for wear, air & fuel filters for blockage and the timing belts for stretching.. Delayed valve sequencing will cause the valves to close late.. Renegade
 
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