Lawnboy 7263 running too lean???

[franchi]

Hello oldlawnboy et. al.:

This morning, I just can not get the idea of this engine not receiving enough fuel to run well. What is bothering me is that the engine starts so very easily. It starts on the third pull after being primed through the carb. If the spark were missing so many times, I think that starting would be more difficult. Whenever I pull the starter cord, I get a spark every time! If the "coil" were bad, I think that the engine would run well in the low speed setting. 800 rpm, and falter when the throttle is opened. I may be way off base with this "logic" but what do I know?

Any more suggestiopns?

Thanks for the reply oldlawnboy.

Stay well my friends,

Franchi

 

[old lawnboy]

Here is some information on the ignition module. Be sure it is installed as shown. If you read the one page, it says the low speed kicks out at 800 RPM's. This is very low considering the mower normally runs at 3200 RPM.

 

[franchi]

Hi oldlawnboy:

Thanks for the reply.

I was aware of the timing increase in the CD pac but I have no idea as to how it makes the change in the timing. It must be triggered by an increase in voltage as the engine increases rpm. Of course that leaads me to ask how and why the CD pac can fail. I had a coil on my D 400 go bad a couple of years ago and it caused me great concern. It turned out that the coil was weak, When I got was able to test it, it was borderline in capacity that caused it to fire the plug at inconsistent times. Without the "coil tester" I would have been at a loss to learn what was wrong with the ignition system.

The engine that I had the bad coil on was the one that I posted earlier about. I changed just about all of the fuel and ignitoin conponents before I got the engine to run well. It is an 1970-71 5239 D400 19" that my wife loves to use. I also have a 19" with a d 600 engine that is a bit heavier that she does not prefer to use! Lol Must keep the wife happy as she likes to do all of the trimming while I ride on the riding mower. Lol Health reasons prohibit me from pushing a lawn mower, The 19" with the D 400 engine is a treat to use!

I found a couple of 21" mowers in the rafters of the garage that also have D 600 engines. I should sell those and gain a bit of storage space.

As you may know, I bought a very nice 19" LB last Summer with a D 600 engine for a back up for the wife. I will never wear out thes two 19" mowers. As a matter of fact, at my age, I am not buying any more new shoes. Lol

Stay well my friend,

Franchi

 

[old lawnboy]

If you have a spare Ignition module in another engine you can swap them out pretty quickly. The same goes for the carburetor if you have one. If I am right the solid state parts in the ignition module switch the spark from retarded to run, but don''t know how.

 

[franchi]

Hi All:

Problem solved!

The electronic ignition module was bad. The owner bought a new one form E Bay for $25.00 including shipping. I put it on the mower and it started and continues to start first pull and runs vey well. He remarked that this mower has never run this well! This guy has about 8 older Lawn Boy mowers and that is the only brand he will use.

Sometimes, one gets lucky! Lol

Thanks for all of the replies,

Franchi

 

[franchi]

Oh yes, one thing that caused me some concern was that the engine had a good spark when turnd over. It would not speed up any faster than cranking speed no matter what I did. I learned a good lesson with this engine!

Stay well my friends,

Franchi

 

[bt3]

Glad you got it solved. I was late to the party but that's the first thing you want to check on Lawnboy. And I've had good success with inexpensive aftermarket Amazon coils. Sure beats $100.00 when you can get one for 25 bucks delivered.

You have to watch the carb settings when running lean. As you know, if you run lean for too long or too lean, bad things can happen to piston rings and other parts of that motor. I ran mine lean one summer and it cost me a piston ring replacement.

All's well that ends well.

 

[Phototone]

You can source a CD pack (ignition coil) for a D-600 series? Where?

 

[old lawnboy]

You can source a CD pack (ignition coil) for a D-600 series? Where?

The ignition module that goes out in that manner is rare. I have seen two of them that have gone out like that. I wish I had of kept one of them just to put one in an old mower to run it. It sounds like a hit and miss engine, and that is what it is. Once it reaches the rpm's that the low speed spark drops out and the high speed is not their, it will slow down and the low speed spark takes over again. I have one now that I think the opposite has taken place. You have to pull the starter rope very hard and fast to get it to start and run. I am going to try another ignition module and see if it starts easier. Glad you got it going.