Rev spike on start up

[th365thli]

Hi all,

I recently had to adjust my timing because the previous owner messed around and got it out of spec.

When I turn the key to start the motor, there's a quick rev spike before rapidly coming down to idle spec. This is normal right? I'm assuming maybe there's leftover fuel in the carb or something.

[friogatto]

What kind of spike are you talking about?

How high of a spike?
Exceed 1000rpm?
How long before the high idle drops?

Does it sound different than a typical "turn over, turn over, vroom, idle" at start up?

Cold start should fire then hold at 900ish for about 30 seconds then drop to 700.

[th365thli]

What kind of spike are you talking about?

How high of a spike?
Exceed 1000rpm?
How long before the high idle drops?

Does it sound different than a typical "turn over, turn over, vroom, idle" at start up?

Cold start should fire then hold at 900ish for about 30 seconds then drop to 700.

I took a video. Here it is. It's on muffs though, I need to adjust the idle on the water. However, it does show the spike.