Topic: 74 550K runs flat after 2000 RPMs

[Tattoo]

   Hi, Ok it's better but it still runs flat after 2000 RPMs. I have a 74 550K I just built the carbs and sycrionized them. Someone had built them before and they were way off. I road it today and it's better but it's still flat after 2000 RPMs. It will still go faster but it takes a while. Any one run in to this before? Thanks Tattoo

[mlinder]

intake leak? timing? advance? points?

Can you tells more of what youve done to the bike?

[Tattoo]

I just bought the bike. NO intake leak I checked with carb cleaner. I built the carbs. I haven't checked the points or timing. I guess that's next? Tattoo

[mlinder]

You need to do a complete tune-up and check up first.

you need:
new plugs
new oil
check points
check timing
adjust cam chain
check valve clearances
carb synch

THEN see how it goes.

[Tattoo]

I'll do that tomorrow. Mnay thanks, Tattoo

[TwoTired]

You also need to tell us if the stock exhaust and air filter are being used.  And, if the air filter is new.

[Tattoo]

Yes I'm sure that would help. New filter with stock air box. 2 into 2 aftermarket exhaust. Tattoo