Lawnboy lz21pnc

[Vanousb]

HEy all. Picked up a project today at a thrift store. Scored a Lawnboy L21zpnc serial no. K128c0116. For 9.50. Yes I said 9.50. Won't start but has compression, filter is clean, choke and throttle work fine, and no leaks. Seems the kill handle cable I'd stuck. Never worked on a Lawnboy. Don't know if I got a steal if I get it running or not. Any advice or info on this mower is welcome. Would like to find a year of this model and a manual if anyone knows where to look.

 

[dewguy1999]

HEy all. Picked up a project today at a thrift store. Scored a Lawnboy L21zpnc serial no. K128c0116. For 9.50. Yes I said 9.50. Won't start but has compression, filter is clean, choke and throttle work fine, and no leaks. Seems the kill handle cable I'd stuck. Never worked on a Lawnboy. Don't know if I got a steal if I get it running or not. Any advice or info on this mower is welcome. Would like to find a year of this model and a manual if anyone knows where to look.

Looks like it's in pretty good shape. Lawn-Boy's Support Center says it's a 1991 model. You can find the specs, etc. as well as download a Service Manual in the Support Center.

 

[Vanousb]

Looks like it's in pretty good shape. Lawn-Boy's Support Center says it's a 1991 model. You can find the specs, etc. as well as download a Service Manual in the Support Center.

Thanks for the info. Wow...1991. Very cool. Hope to get it cleaned up and running this week. Should be fun. I have tried the support center, but comes back with "no product found". What am I not doing?

 

[Two-Stroke]

Thanks for the info. Wow...1991. Very cool. Hope to get it cleaned up and running this week. Should be fun. I have tried the support center, but comes back with "no product found". What am I not doing?

Double check the model number. Also, try varying the case of the letters in the model number.

 

[Vanousb]

Double check the model number. Also, try varying the case of the letters in the model number.

Casing was the issue. Now to hunt down the user manual or some diagrams.

 

[Vanousb]

Re: Lawnboy L21ZPNC

Its alive!!!! Without really taking anything apart to give good cleaning, got this 1991 Lawn Boy started. Little Carb Cleaner spayed in and some "Lawn Mower Tune Up" and it started right up. Started on first pull after that. Cool little mower. Some issues I could use advice on...

1) The throttle does not really seem to make a difference. Fast and Slow are about the same. Seems to run a little slow. When run over grass to cut, bogged pretty easy. Thoughts?

2) The kill switch cable sticks. Have to wiggle the cable down by the engine to get it to slide and stop engine. Assume I need to clean and lube or replace.

3) Never had a mower that was two cycle and needed oil mix. Cap says 1 : 32 any advice on oil to use.

I know I need to give carb a good cleaning, etc. But wanted to get manual first to see some diagrams of how things go together. Any experienced Lawnboy folks I am open to suggestions as I go.

 

[dewguy1999]

Re: Lawnboy L21ZPNC

Its alive!!!! Without really taking anything apart to give good cleaning, got this 1991 Lawn Boy started. Little Carb Cleaner spayed in and some "Lawn Mower Tune Up" and it started right up. Started on first pull after that. Cool little mower. Some issues I could use advice on...

1) The throttle does not really seem to make a difference. Fast and Slow are about the same. Seems to run a little slow. When run over grass to cut, bogged pretty easy. Thoughts?

2) The kill switch cable sticks. Have to wiggle the cable down by the engine to get it to slide and stop engine. Assume I need to clean and lube or replace.

3) Never had a mower that was two cycle and needed oil mix. Cap says 1 : 32 any advice on oil to use.

I know I need to give carb a good cleaning, etc. But wanted to get manual first to see some diagrams of how things go together. Any experienced Lawnboy folks I am open to suggestions as I go.

The only one I can comment on is the oil. Over the 14 years that I've owned my Lawn-Boy I've used Lawn-Boy 2-cycle oil at 32:1 which is one 8 ounce bottle to 2 gallons of gas. A few times I've used Echo Power Blend Oil at roughly 50:1, which is one 5.2 ounce bottle to 2 gallons of gas. The Lawn-Boy oil is a traditional oil with a stabilizer whereas the Echo is a synthetic blend oil with stabilizer. There are many fans of both on the net.

 

[Vanousb]

Lawnboy has informed me they do not have a copy of the owners manual for that model on file due to it being older model...so does anyone have or know of a place where a copy could be found for a L21ZPNC Lawnboy? Thanks VB

 

[dewguy1999]

Lawnboy has informed me they do not have a copy of the owners manual for that model on file due to it being older model...so does anyone have or know of a place where a copy could be found for a L21ZPNC Lawnboy? Thanks VB

Hopefully someone here will have a copy. I don't know what the Owner's Manual for the L21ZPNC was like in 1991, but the Owner's Manual for my 10247 from 2000 is pretty basic and I think that all the really "good" information is in the Service Manuals which I believe are available for the L21ZPNC.

 

[Phototone]

Having bought and owned several Lawnboy mowers from new, with several OWNERS manuals, I can tell you that you won't find much, if any SERVICE information contained in them. Lots of safety warnings, etc. How to start, what ratio of oil to use, etc. How to adjust the wheel heights. Almost all this you can figure out. I use lawnboy oil at the recommended ratio, but any 2-cycle oil for yard equipment, chainsaws, weedeaters, is fine at the recommended dilution for Lawnboy. 8 oz oil to 2 gallons gas. 1:32

Your best bet for diagnosis is to ask your questions here.

The lack of speed change with throttle lever "could" be due to the governor wind-vane shaft being sticky or the spring (on the shaft) not adjusted correctly. They are adjustable. These carbs really get gummed up with dirt mixed with oily gas and form sludge on all the exterior surfaces restricting the movements of parts that are supposed to move.