I can take you out in a ride in a few boats tomorrow with same carburetor he has that does this too. I can also put in a higher tension vac secary spring that will stop this from happening. Issue, is that it will cut engine power down a decent amt too.

One restart will typically make it go back down to normal idle. Once in a while, 2 restarts.

As far as post #7 - you are correct. Most people don't realize the solid Morse cable combined with a throttle lever doesn't work the same in reagrds to idle speed the same way a gas pedal and carb with a return spring does.

example:

" take your foot off your cars gas pedal and the throttle returns to idle position.

take your hand of the boats throttle lever and it stays where you left it. So, when you put lever in neutral (idle) it leaves carb idle position where the cable dictates.

New cables three years ago. It's a mechanical secondary, not vacuum

SB can I take you out in mercruiser TKS carb app and we will see how high that idle is at start up - talk about high and very load noise - really a poor carb by mercruiser - freakin 110 degrees down here and the carb takes 5 mins to warm up and return idle to normal.

Rut row he says mech secondaries

Rut row is right !

I don't have this one.

Ha !

Your funny sometimes - we can come up some good ones - oh just sometimes we can

Sorry about that. Wasn't even thinking about that when I posted

Actually, it is basically the same I'm talking about. The wound spring on the throttle shaft does not have enough tension to fully seat the secondary throttle shaft. With vac secondries, the vac spring helps (a little) push it back also.

Before trying to add tesnsion, make sure your sec throttle blades are centered (loosen blad screws and open/slam shut throttle a few times to center them) and make sure t blades don't have rough edges that are slightly catching throttle bores.

Sorry, I'm typing in the dark. I do not cell phone text.

edit in; remark is for my bad typing tonight.

I tried to PM you but your folder is full

I will add that Demon Carbs Barry Grant had their share of problems in the marine world - he had even some lawsuits and federal marine recalls for his carbs. So did Holley with Volvo. here is a look at the Volvo service bulletin as we use to have problems with their carbs. read it

http://www.marinemechanic.com/volvo/...2010/23-1-22_A[1].pdf