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Long story short....I acquired the mower from an elderly couple that went into a condo.
It's a model 4263 (1950-1988). I downloaded the service manual but don't see a prime butoon described.
Is there one on this mower?
The only way I can start it is priming the cylinder by inserting fuel directly through the spark plug opening. About a half straw full gets the job done. Once started the mower runs pretty well. If I stop it it starts again in one pull.
I'll assume it's in need of a tune up but seeing how well it starts if I prime the cylinder I figured that's all I need for now :smile:

If you haven't, go to the lawn boy website and under the parts link enter the model #. There you will find parts diagrams for your machine. If still no luck on a primer bulb, grab an old spray bottle lying around and give it a squirt or two each time you cold start it. Anything is worth keeping these old machines going . Hope I was of some help.

nothing like the smell of 2-stroke smoke and fresh cut grass roasting on the muffler!

Fireman:
I visited the website already but found nothing new from what info I have in the original manual I downloaded. The diagrams in the manual are hand drawn and not very clear. In "Section 4, Page 30" (4-30) I see what appears to be a sectional view of a priming bulb and primer hose but I certainly do NOT have it on the mower anywhere :thumbdown:

Either the primer bulb is missing or damaged and had not been replaced by the older gentleman. I'll look closer at the mower after giving it a good cleanup. The mower is caked with grass and spent fuel.

One question tho.....what do u mean when you say quote "grab an old spray bottle lying around and give it a squirt or two each time you cold start it"? A squirt where? Directly into the carb through the air intake?

Correct. A shot of fuel into the carb should do the trick if all else fails.
Easier than taking the plug out each time. After you get it cleaned up, post a pic.

nothing like the smell of 2-stroke smoke and fresh cut grass roasting on the muffler!

Btw. Looked on lb website for you. Model 4263 is not a working number...? Did you say it was a 50's era mower?

nothing like the smell of 2-stroke smoke and fresh cut grass roasting on the muffler!

Go here:
https://support.lawnboy.com/portal/server.pt/community/product_center/217
Enter model number: 4263

The user manual describes this design to be from 1950-1988 but the model number 4263 reflects a 1988 mower as seen below.


Model Year Serial Range Engine Manuafacturer Engine Model Number
4263 1988 G00000001-G99999999 Lawn-Boy F

I can email you the user manual if you want a peek. PM me if you do. It's a 639 pager @ 140MB.

gsrgoass said:

Go here:
https://support.lawnboy.com/portal/server.pt/community/product_center/217
Enter model number: 4263

The user manual describes this design to be from 1950-1988 but the model number 4263 reflects a 1988 mower as seen below.


Model Year Serial Range Engine Manuafacturer Engine Model Number
4263 1988 G00000001-G99999999 Lawn-Boy F

I can email you the user manual if you want a peek. PM me if you do. It's a 639 pager @ 140MB.

Click to expand...

It would be nice to see lots of pics of it around the outside and engine to get a idea of what year it might be.

gsrgofass said:

Go here:
https://support.lawnboy.com/portal/server.pt/community/product_center/217
Enter model number: 4263

The user manual describes this design to be from 1950-1988 but the model number 4263 reflects a 1988 mower as seen below.


Model Year Serial Range Engine Manuafacturer Engine Model Number
4263 1988 G00000001-G99999999 Lawn-Boy F

I can email you the user manual if you want a peek. PM me if you do. It's a 639 pager @ 140MB.

Click to expand...

Where did you find that manual? Is it a USER manual? -- at a whopping 639 pages?

If it's actually a service manual I'm very interested in finding one for the models I have.

dwblue00 said:

It would be nice to see lots of pics of it around the outside and engine to get a idea of what year it might be.

Click to expand...

It appears to be a 1988 year of manufacture according to the model number.
I gave it a wash and will post pics. The exterior of the carb and linkages are completely covered is oil/gas/dirt residue. The mower either runs full out or idles rough. If there is supposed to be a priming bulb it's definitely not there. I have to prime the carb by dropping fuel down the intake.
Even though the service manual is 640 pages it's from the early 80's and it's hand drawn diagrams and desciptions are primative at best.

I will have to wait until winter to disassemble the carb for an overhaul. I can't risk messing it up for summer and be left without a means to mow the lawn.

Two-Stroke said:

Where did you find that manual? Is it a USER manual? -- at a whopping 639 pages?

If it's actually a service manual I'm very interested in finding one for the models I have.

Click to expand...

It's a service manual for this design made from 1950 thru 1988. You can find alot of manuals here:
https://support.lawnboy.com/portal/server.pt/community/product_center/217

Enter the model of your Lawn-Boy and browse to find what they have.

gsrgofass said:

It's a service manual for this design made from 1950 thru 1988. You can find alot of manuals here:
https://support.lawnboy.com/portal/server.pt/community/product_center/217

Enter the model of your Lawn-Boy and browse to find what they have.

Click to expand...

That's great -- thanks so much for the link. :smile:

"Some" lawnboys just had a choke function on the carb. Earliest ones you choked by pulling up on the on-off switch. There were models in the 1980's that had the choke activated by pushing the throttle lever past "fast".

Phototone said:

"Some" lawnboys just had a choke function on the carb. Earliest ones you choked by pulling up on the on-off switch. There were models in the 1980's that had the choke activated by pushing the throttle lever past "fast".

Click to expand...

Chances are that if it has a throttle then photone is right. Just push the throttle as far past the high speed setting as you can get it