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idlewatcher
Houston Astros Fan
Houston
Member since Jan 2012
40490 posts
 Online 

Any lawnmower repair baws in the house?
Have an older model 21" deck Craftsman with a 4.5HP B&S motor and it's been having a lot of issues lately with staying running. Took off the air filter and it ran just fine, but once the air filter gets close enough, it will die immediately.

I've taken apart and cleaned the carb with carb cleaner, changed out the gas, put new oil in it, swapped out the spark plug and when it starts, it'll remain running with a crapload of white smoke. Then after a minute or so, it will slowly rev down and then kill.

Any ideas what else I could try? TIA


CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
444 posts

re: Any lawnmower repair baws in the house?
Install a new carb and I bet it runs fine. Many of these carbs just don’t function well with cleaning or rebuilding and new replacement carbs are usually cheap. That’s been my experience over the years. I’ll clean the carb once, if it doesn’t correct the problem, then a new carb goes on.


Bedhog
LSU Fan
Denham Springs
Member since Apr 2019
700 posts

re: Any lawnmower repair baws in the house?
did you change your air filter? If not the carb will suck oil from the crankcase. Try disconnecting the tube under the filter housing and see if it still does it.


sleepytime
Member since Feb 2014
2251 posts

re: Any lawnmower repair baws in the house?
Either the air filter is extremely clogged up, the choke is stuck closed or the float is stuck open. Check the choke and if that’s good, clean or replace the carb


keakar
Member since Jan 2017
9789 posts

re: Any lawnmower repair baws in the house?
quote:

Install a new carb and I bet it runs fine. Many of these carbs just don’t function well with cleaning or rebuilding and new replacement carbs are usually cheap. That’s been my experience over the years. I’ll clean the carb once, if it doesn’t correct the problem, then a new carb goes on.


this ^^^^^^

whats happening is the air filter provides a restriction so its sucking too much gas in and that raw gas burning is the smoke you are seeing.

small chance its a bad air filter not letting air through it but its gonna be the carb.

you can buy a new carb for it for about $10 which is only $5 more then a carb kit costs to clean and rebuild that carb, its just pointless to try unless you just like tinkering with stuff

This post was edited on 6/12 at 3:09 pm


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idlewatcher
Houston Astros Fan
Houston
Member since Jan 2012
40490 posts
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re: Any lawnmower repair baws in the house?
quote:

did you change your air filter?


Sorry for the delay in response guys.

Yea, brand new filter is on there as well.

Previous poster said maybe swamp out the carb for a new one. All the videos I've seen on my exact motor seem to make it work once the carb is cleaned.

I'm admittedly a novice with lawnmowers


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idlewatcher
Houston Astros Fan
Houston
Member since Jan 2012
40490 posts
 Online 

re: Any lawnmower repair baws in the house?
quote:

Either the air filter is extremely clogged up, the choke is stuck closed or the float is stuck open. Check the choke and if that’s good, clean or replace the carb


I do believe that may be part of the problem. The screw that goes through the air filter into the carb housing (?) is difficult to get in there even after it was cleaned.

I did read something about a needle valve getting gunked up and that not allowing the engine to fire properly. Do all mowers have needle valves?


DMAN1968
Member since Apr 2019
54 posts

re: Any lawnmower repair baws in the house?
ahhh...If you cleaned the carb and didn't check the needle valve...that may be the problem. I'm in the buy a new one camp.
This post was edited on 6/14 at 12:55 am


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