mac 45 carb question

[tmunn]

Is there another carb that has a LSN that will bolt right on to the .45 mac.

I hate trying to get my mac 21's going that have the stock carbs

I am always flooding them and getting too much fuel in the base etc..

They worked much better for me when i had my cmb valvola carb or an o.s 20j on it.

Was wondering what if any , carb is available for the Mac .45

Thanks

 

[AndyBrown]

Is there another carb that has a LSN that will bolt right on to the .45 mac.
I hate trying to get my mac 21's going that have the stock carbs

I am always flooding them and getting too much fuel in the base etc..

They worked much better for me when i had my cmb valvola carb or an o.s 20j on it.

Was wondering what if any , carb is available for the Mac .45

Thanks

The MAC carbs are easy to use, they just need a little understanding.

I'm assuming your tanks are below the sparybar centerline so fuel won't syphon

while the boat is sitting level.

Be sure that fuel is not going into the carb because of heat expansion.

This is caused sometimes by sun heating the tank.

Immediately before starting the engine pull the glow plug, cover the head with a rag and spin

the engine over with the starter. Do this with the fuel line connected.

Two resons for doing this.

#1. to make to clear exces soil and stale fuel from the crankcase.

#2. to pull a fresh raw fuel into the cylinder.

Now dump the excees fuel out of the pipe if there seemed to be a lot of junk in the engine.

Pinch off the pressure line while doing this or more fuel will run from the tank into the pipe.

Now remove the fuel line from the carb and spin the engine for just a second or less.

This is to clean excess raw fuel from the cylinder and leave only fresh fuel vapor that will ignite easily.

Now connect the fuel line to the carb. Install the glow plug and start the engine.

Don't do this and wait 10 minutes before starting. The same flodding ploblems may occure.

If you are racing do this when there is only 2 min. until starting time.

Always be sure to dump the pipe after spinning the engine over the first time or all of tha stale fuel and oil will

end up back in the cylinder.

With this procedure the engine will fire off immediatley.

Good boating,

Andy

 

[dwb2620]

Is there another carb that has a LSN that will bolt right on to the .45 mac.
I hate trying to get my mac 21's going that have the stock carbs

I am always flooding them and getting too much fuel in the base etc..

They worked much better for me when i had my cmb valvola carb or an o.s 20j on it.

Was wondering what if any , carb is available for the Mac .45

Thanks

The MAC carbs are easy to use, they just need a little understanding.

I'm assuming your tanks are below the sparybar centerline so fuel won't syphon

while the boat is sitting level.

Be sure that fuel is not going into the carb because of heat expansion.

This is caused sometimes by sun heating the tank.

Immediately before starting the engine pull the glow plug, cover the head with a rag and spin

the engine over with the starter. Do this with the fuel line connected.

Two resons for doing this.

#1. to make to clear exces soil and stale fuel from the crankcase.

#2. to pull a fresh raw fuel into the cylinder.

Now dump the excees fuel out of the pipe if there seemed to be a lot of junk in the engine.

Pinch off the pressure line while doing this or more fuel will run from the tank into the pipe.

Now remove the fuel line from the carb and spin the engine for just a second or less.

This is to clean excess raw fuel from the cylinder and leave only fresh fuel vapor that will ignite easily.

Now connect the fuel line to the carb. Install the glow plug and start the engine.

Don't do this and wait 10 minutes before starting. The same flodding ploblems may occure.

If you are racing do this when there is only 2 min. until starting time.

Always be sure to dump the pipe after spinning the engine over the first time or all of tha stale fuel and oil will

end up back in the cylinder.

With this procedure the engine will fire off immediatley.

Good boating,

Andy

Andy and TMunn,

That's exactly how I do it! Works every time!

David

 

[tmunn]

on the 21's the engine loads up and floods everytime once it's going but perhaps i am too rich.

I will try this on the next time out.

thanks

 

[Sean Bowf]

Walmart sells some forecepts over in the fishing department. They are kind of like locking needlenose. I put these on my fuel line after I come in to make sure fuel does not siphon into my engine. I did take them to my sander to take the sharpness of the teeth first...so it does not wear the fuel line.

Sean

 

[Buckshot]

on the 21's the engine loads up and floods everytime once it's going but perhaps i am too rich.
I will try this on the next time out.

thanks

If your 20 motor wants to load up and die after it is started it might not be too rich but just about right. Just open the throttle a little more or if the cowl is still off give the fuel line a split second pinch to help it out.

-Buck-

 

[tmunn]

Thanks guys i will try it next time out and see what happens..