What is this part called on Force 125

[krankin]

I am looking to replace that black plastic nut that I'd broken. Just got the Bayliner Capri 1900 with a FORCE 125..THX FOR THE HELP : )

 

[krankin]

View attachment 387820I am looking to replace that black plastic nut that is broken. Just got the Bayliner Capri 1900 with a FORCE 125..THX FOR THE HELP : )

What adjustment does the screw that goes into the black plastic nut do?

 

[Nordin]

It is for the timing.
You adjust the timing with these.

 

[jimmbo]

Mercury Part# F499035

That Screw/Rod that is goes on, has Right and Left Hand threads, no wonder it lists for almost $50.
You need to pay attention on how you install it, and will need to Check, and reset the max Spark Advance, and also do a complete Link and Sync

 

[krankin]

Mercury Part# F499035

That Screw/Rod that is goes on, has Right and Left Hand threads, no wonder it lists for almost $50.
You need to pay attention on how you install it, and will need to Check, and reset the max Spark Advance, and also do a complete Link and Sync

Newbie here to this motor n boating LOL...Max spark advance...Link and Sync. Are you referring to the timing or ??

 

[jimmbo]

Newbie here to this motor n boating LOL...Max spark advance...Link and Sync. Are you referring to the timing or ??

Well these engine do have a Maximum Spark Advance, or else bad things happen, just like on Car/Truck engine, only the advance is controlled by the Throttle Control. The Carbs are fully closed at Idle, and open late in the Timing Advance, in a lot of cases not till after Maximum Advance has happened. Idle Speed is determined only by the Spark Timing, so there is no Timing Spec at Idle. Timing will be whatever it needs to be to attain the proper Idling Speed, in gear
The Adjustment of the Relationship between the Spark Advancing and the Carb Opening is referred to as a Link(Linkage) and Sync(synchronization), as there is interaction between them.

 

[jerryjerry05]

When you replace it try to get it back to where it was before.
Magic marker the threads or how ever.
That way the timing job(link/sync) will be easier.
Replace BOTH!!! about 35$
DON'T get used parts.
They sell parts here,


END-CONTROL-RH
Item #: F499035

END​

Item #: F499036

 

[krankin]

Well these engine do have a Maximum Spark Advance, or else bad things happen, just like on Car/Truck engine, only the advance is controlled by the Throttle Control. The Carbs are fully closed at Idle, and open late in the Timing Advance, in a lot of cases not till after Maximum Advance has happened. Idle Speed is determined only by the Spark Timing, so there is no Timing Spec at Idle. Timing will be whatever it needs to be to attain the proper Idling Speed, in gear
The Adjustment of the Relationship between the Spark Advancing and the Carb Opening is referred to as a Link(Linkage) and Sync(synchronization), as there is interaction between them.

Ok thx, but that is over my head. Can you break it down to me? What does this screw contril and how do you adjust it to get it fuly functional? I am mechanical but have never worked on boat motor, just VW bugs : ) My understanding this screw controls the Throttle Control. I can say that my idle is low RPM. I do not have a tach meter as part of the intstument panel, but could buy one that attaches to the spark plug wire to give me a read. Or if you ahve a better suggestiosn, I am all ears... THANK YOU FOR ALL THE HELP EVERYONE ...

 

[brodmann]

Google the specs for link and sync for your motor. You should find simple steps that won't require a tach. Basically, it's making the carburetors open when they are supposed to and the timing advance when it's supposed. Contrary to another response, it will also explain how to set idle timing and the part that you are looking for sets the maximum timing advance and will not allow the timing to advance too far. Yes, it also acts at a throttle stop. Because it takes time for electricity to flow through your ignition system, as the motor turns faster, the process for creatin "spark" need to happen earlier so that the combustion takes place at the right time. Electricity travels at a set pace. Obviously it's very quickly, but on a motor that makes 5000 revolutions per minute, that time needs to be adjusted to be perfect. So, at higher RPM's, the timing needs to be advanced. The beginning of the process has to happen earlier than at idle. The timing terminology is BTDC Before Top Dead Center. Top Dead Center is whe the #1 piston is at the very top of the stroke. My 115 Yamah has a timing of 25 degrees BTDC at wide open throttle Wide Open Throttle. The idle timing for my motor is 4 degrees ATDC After Top Dead Center. At idle, the spark occurs sligtly after the piston reaches the top of it's stroke, so combustion occurs as the piston is just starting it's down stroke. You should be able to find a video for your exact motor online for tune up procedures. A repair manual for your motor will show pictures and describe step-by-step what you need to do. I've found a public library to be a great place to find repair manuals for older outboard motors. You can look through and read what you need to read and probably print off the pages on "tune up" to get all the specs and instructions. First of all, be patient and take your time. It's surprising how many times I've run across parts with reversed or "left hand" threads. You usually wouldn't expect that so you fight so hard to loosen things that you break something. Let us know how it goes. Keep asking questions if you need to. We're here to help.

 

[Nordin]

As said before that screw and lock nut control the spark advance.
On these Chrysler/Force engines you set the maximum spark advance at WOT (wide open throttle).
The spec for your engine from factory was in those days with better fuel than to day 32dgr BTDC at WOT.
With the fuel there are now I would recommend you to set it to 30 or even 28 drg BTDC.
Best is to set it dynamic (when running at WOT) but you can set it static (cranking speed with the starter).
28 dgr static will end up with 30 dgr dynamic.
Spark advance at idle will be what it will be on these engines.
Just set the idle with the idle screw to 6-700 RPM in gear in water.

 

[topgun3690]

Contrary to another response, it will also explain how to set idle timing. The idle timing for my motor is 4 degrees ATDC After Top Dead Center.

There is no idle timing spec on Force engines....timing is set at WOT. Yamaha is a different animal....
Might want to fact check your info before stating that somebody else's info is wrong.....

 

[jimmbo]

There is no idle timing spec on Force engines....timing is set at WOT. Yamaha is a different animal....
Might want to fact check your info before stating that somebody else's info is wrong.....

His mind is made up, facts will only confuse him

 

[The Force power]

My 115 Yamaha has a timing of 25 degrees BTDC at wide open throttle Wide Open Throttle. The idle timing for my motor is 4 degrees ATDC After Top Dead Center.

Just for giggles.......... a force engine (running at idle 750 RPM) from that spec./age we're dealing with. Will have the timing on #1 (approximately) @ 7 degrees BTDC

 

[jimmbo]

Just for giggles.......... a force engine (running at idle 750 RPM) from that spec./age we're dealing with. Will have the timing on #1 (approximately) @ 7 degrees BTDC

Change the Prop Pitch, reset the Idle Speed, and the timing will be different

 

[Jiggz]

Back to the original question, the black plastic block that is broken is a mating part of the threaded stud with nut on the foreground of the pic. The nut is use to lock the set timing. The function is for setting timing on the engine. Engine timing on this motor is fully mechanical in conjunction with the timing tower where that plastic thingy attached to. As suggested, mark where the original setting is at and then replace and set it as close as possible to the original setting. This will make setting the timing easier than starting from scratch. There is a sticky note on how to check timing.