Bmc 1.5 Tick Over

[Cheesey69]

Hi

I’d like to increase the tick over of my bmc 1.5. 
so according to my manual, the tick over is controlled by a screw with a spring under it. 
found that, can adjust speed but as soon as I let go of screw the spring just returns it to its last position. 
am I missing something?

[Vaughan]

Maybe you have too much tension in the control cable to the Morse control, which is overcoming the tension of the throttle spring when the gear lever is in neutral. Try disconnecting the control cable at the injector pump end, and see what happens! 

[Cheesey69]

My bad! No the screw is a separate screw on the injector pump. 

[annv]

Hi Your doing the wrong one spring under ie along thread not the return spring. John

[ElysianCraft]

Did my 1.5 BMC tickover at the weekend, no spring, just a lock nut on the adjusting bolt....You are aiming for 500rpm,  I do mine 'IN GEAR' so it has a lovely smooth tick over at 'dead slow ahead' but every boat is diffrent, sometimes you end up ignoring the rpm setting and just set it where it feels and sounds right.....avoiding vibration where possible.

[Cheesey69]

2 hours ago, ElysianCraft said:

Did my 1.5 BMC tickover at the weekend, no spring, just a lock nut on the adjusting bolt....You are aiming for 500rpm,  I do mine 'IN GEAR' so it has a lovely smooth tick over at 'dead slow ahead' but every boat is diffrent, sometimes you end up ignoring the rpm setting and just set it where it feels and sounds right.....avoiding vibration where possible.

Spot on. That screw and spring under apparently is the base tick over speed.  Indeed if I turn it the tick over increases but the spring just turns back to initial position. 
Going your route here. Similar to yours except mine isn’t on a nut but you have to disconnect the connection to the pump arm and turn it. 
just hoped you could do it with that screw. 
what was happening the engine was stalling under low revs when changing direction. A tick over of 900 keeps things smooth