runs a second

[hitch45]

Hello all I have a John Deere sabre model # 1642 hydro riding lawn mower 16 hp and it it is getting gas & spark but won't run...!!!can someone help please!!:confused2:

 

[reynoldston]

Hello all I have a John Deere sabre model # 1642 hydro riding lawn mower 16 hp and it it is getting gas & spark but won't run...!!!can someone help please!!:confused2:

Now your title says it runs for one second. So it dose run. So this means you are getting everything for it to run but for a short time. This to me would point at the fuel part of it.

 

[Retiredcarguy]

Fresh fuel and filter is a must, then blow through the carb fuel line in both directions with compressed air.

It sounds like it is just starting on vapors.

 

[hitch45]

sorry meant to say ran when I shot starter fluid and then would start but would run a second ,Have got the engine apart and the push rod was off the rocker arm wonder why and what made this happen? all help is appreciated...

 

[Retiredcarguy]

The valve may have stuck open, allowing the clearance to be excessive.
How many hours and years on this motor?

 

[hitch45]

It did start and then it just spun free and the intake push rod was loose now I have to start from there any clues to what would cause that,doesn't seem to be a valve adjustment screw or no way to adjust ?

 

[Retiredcarguy]

It did start and then it just spun free and the intake push rod was loose now I have to start from there any clues to what would cause that,doesn't seem to be a valve adjustment screw or no way to adjust ?

The valve may have stuck open.
It may have stuck in the guide or the valve spring may be broken.
The cam lobe or lifter/follower may be worn.
Intake or exhaust valve?

About how many hours on this motor?

 

[hitch45]

we have no idea how many hrs and miles it has on it, my brother gave it to us when he moved to Florida,we did everything and it still wont start?? only when to spray with starter fluid and then it quits???please all help welcome

 

[Fish]

First thing to do is put up the engine's brand/model/spec numbers first, then go into more detail about the pushrod thing.

 

[reynoldston]

As I recall that mower has a Briggs in it. I have ran across the same problem on that model mower. The repair job that I has the push rod came off the rocker arm. I installed a new push rod. The problem I found that caused the push rod to come off the rocker the cylinder filled with gas from a bad needle valve in the carburetor. This was a few years back and at that time they didn't sell repair parts for that carburetor so I has to buy a new carburetor. It sounds to me like you may have a bad needle valve in your carb. so if I was you I would see if you can find a repair kit for your carburetor and give it a good cleaning.