When to use throttle warm up lever?

[H20Rat]

Re: When to use throttle warm up lever?

sounds like it worked out well! As others have mentioned, no 2 stroke is the same for starting. They all have their favorite routine. Just because it started now, don't give up trying other methods! Try without the fast idle, I've rarely had to use it on the engines I've owned. (my current merc 175 starts in gear and technically doesn't even have a fast idle!)

 

[MH Hawker]

Re: When to use throttle warm up lever?

I have only had 4 outboards and each one started different. a 68 85 hp Johnson liked a up and back down of the warm up and a touch of choke, a 77 40 hp merc likes 1/4 warm up and choke, a 88 nissian 40 hp liked a full warm up and choke, a 96 mariner 15 hp, just plain enricher.

 

[Ki Ki]

Re: When to use throttle warm up lever?

I pushed in the key , which chokes this motor, while turning. Should I always choke a little? Does it do anything to press the choke once or twice and release I before starting? I think this motor would probably start without the warm up lever, but what's your thoughts on the choke?

 

[etracer68]

Re: When to use throttle warm up lever?

I have a 1987 90HP, and it has a primer (some people call it a choke), when the key is pushed in, it squirts a shot of gas into the carbs. The lever just opens the throttle plates, kinda like a car carb, without accel pump. Each time you push or bump the key, it gives the motor a shot of fuel. You can bump the key anytime during starting, or even if it is running, and starting to die. I sometimes on a cold start, will move the lever about half, and as soon as the motor starts, I may have to bump(one or two times) the key, to keep it running, then ajust the lever to about 1000rpms. Your shifter wont or shouldnt go into gear without the lever completely down. Sounds like you got a good Johnny, there great motors.

 

[Ki Ki]

Re: When to use throttle warm up lever?

I have a 1987 90HP, and it has a primer (some people call it a choke), when the key is pushed in, it squirts a shot of gas into the carbs. The lever just opens the throttle plates, kinda like a car carb, without accel pump. Each time you push or bump the key, it gives the motor a shot of fuel. You can bump the key anytime during starting, or even if it is running, and starting to die. I sometimes on a cold start, will move the lever about half, and as soon as the motor starts, I may have to bump(one or two times) the key, to keep it running, then ajust the lever to about 1000rpms. Your shifter wont or shouldnt go into gear without the lever completely down. Sounds like you got a good Johnny, there great motors.

You are all awesome. We love our new 14' Grumman boat.

 

[NYBo]

Re: When to use throttle warm up lever?

I pushed in the key , which chokes this motor, while turning. Should I always choke a little? Does it do anything to press the choke once or twice and release I before starting? I think this motor would probably start without the warm up lever, but what's your thoughts on the choke?

The choke is either fully open or fully closed- you can't choke it "a little." Opening and closing the choke before starting will accomplish nothing.

 

[H20Rat]

Re: When to use throttle warm up lever?

The choke is either fully open or fully closed- you can't choke it "a little." Opening and closing the choke before starting will accomplish nothing.

depends on the engine. I've seen some (old johnsons in particular) that would spritz a little fuel in when you hit the key.

 

[NYBo]

Re: When to use throttle warm up lever?

depends on the engine. I've seen some (old johnsons in particular) that would spritz a little fuel in when you hit the key.

Never knew that!

 

[rtpassini]

Re: When to use throttle warm up lever?

Something I have learned that caused me to be stranded on one of the countries largest inland lakes. I now start it with as little gas as possible. In other words, no choke and no warm up lever at first and see what happens. like stated, they can flood easily. then you are stuck

also, Mine has the "primer" (when you push in the key) which gives it a shot of fuel in each carb.


Although, I dont exactly know the difference between the warm up lever vs the primer. And when to use what.

 

[JoLin]

Re: When to use throttle warm up lever?

depends on the engine. I've seen some (old johnsons in particular) that would spritz a little fuel in when you hit the key.

My '96, 175hp Johnson did that. And different from many (all?), the start/fast idle lever on those engines also manually advances the ignition timing.

The '97, 85 hp Yamaha on my 16' has the normal fast idle lever, the push-in ignition switch that momentarily closes the carb butterflies; and a separate push-pull manual choke on the motor itself that can be set to any position I want. So far, I've only needed to use the lever and ignition switch choke to start it and keep it running.

 

[Ki Ki]

Re: When to use throttle warm up lever?

Something I have learned that caused me to be stranded on one of the countries largest inland lakes. I now start it with as little gas as possible. In other words, no choke and no warm up lever at first and see what happens. like stated, they can flood easily. then you are stuck

also, Mine has the "primer" (when you push in the key) which gives it a shot of fuel in each carb.


Although, I dont exactly know the difference between the warm up lever vs the primer. And when to use what.

I believe this has that primer button / choke too. I push it in before turning and start. That's a good tip to try to start it without choking at first. Then it it needs it on a colder day try choking. I've always thought you at least use the warm up lever a little to start, but maybe I'm mistaken. Maybe next time out I just try pushing the choke in once and releasing then turning the key without holding the choke in. That may have been unnecessary on a warm day.

 

[MH Hawker]

Re: When to use throttle warm up lever?

Although, I dont exactly know the difference between the warm up lever vs the primer. And when to use what.

The warm up leave opens up the carb a bit just like when you push the throttle forward to give it more fuel to run and raises the idle speed ,,the primer just gives it a squirt of fuel to help it start,, a choke closes off the front of the carb and forces it to draw in more fuel to help it start. Some have a manual choke and a electric primer.

 

[tomhath]

Re: When to use throttle warm up lever?

The warm up leave opens up the carb a bit just like when you push the throttle forward to give it more fuel to run and raises the idle speed ,,the primer just gives it a squirt of fuel to help it start,, a choke closes off the front of the carb and forces it to draw in more fuel to help it start. Some have a manual choke and a electric primer.

Yup, adding a bit, more detail...

Looking at the carb you'll see that the choke plate closes off the air intake at the front (intake side), so a strong vacuum is created inside the carb throat causing extra gas to be sucked through the main jet. That helps it start start but the engine won't run like that and it will flood the cylinders with gas.

The throttle plate is at the back (engine side) of the carb; closing it restricts the air flow but doesn't cause a strong vacuum so the engine runs slower without flooding. The idle jet is behind the throttle to provide enough fuel to keep it running when the throat is restricted at the back by the throttle.

So now you see why you need both. Choke or primer gives it an extra shot of fuel to start when cold. Warmup lever gives it enough of the normal air/fuel mix to idle faster until it's warmed up.

Obviously to start the engine, the fuel bowl in the carb has to be full so gas can be pulled through the jets. You'll often see someone squeeze the primer bulb on the fuel line and immediately start cranking or pulling the starter cord. It usually won't start at first because the carb bowl takes a minute or so to fill. Squeeze the bulb before you back the trailer into the water and the carb will be ready when the boat is in the water.

 

[Ki Ki]

Re: When to use throttle warm up lever?

Now a bit confused. My key has th push button key for choke. Can that also be the primer to squirt a little fuel? I don't have anything separate from this

 

[MH Hawker]

Re: When to use throttle warm up lever?

That depends on the motor, some have a primer and others a choke both work more of less the same way. Mine has both, it has a electric primer that works when you push in the key switch and a manual choke that you have to pull out a knob on the front of the motor. Some have a electric choke from the key switch. It dosnt really mater which you have as long as it works. You will have to take off your motor cowl and look to see what you have.