Kawasaki fr691v smokes badly

[jhellwig]

The first picture makes it look like the piston is sloppy in the cylinder. If the piston can move around a lot in the cylinder that is where your smoke is coming from because the rings are worn out also.

Run it till it dies. I wouldn't put much money into it.

 

[john_pifer]

thanks for the reminder to check and make sure the cooling fins on my cylinders are clear.

 

[joegreen]

The first picture makes it look like the piston is sloppy in the cylinder. If the piston can move around a lot in the cylinder that is where your smoke is coming from because the rings are worn out also.

Run it till it dies. I wouldn't put much money into it.

I would love to run it till it dies but it smokes so bad i can’t comfortably mow with it. Ill be fumigated. I dont mind rebuilding it but would prefer not too. I really like the machine

 

[Lawnman23]

I would love to run it till it dies but it smokes so bad i can’t comfortably mow with it. Ill be fumigated. I dont mind rebuilding it but would prefer not too. I really like the machine

As a Hail Mary, you could try a bottle of Ring Seal along with some Valvoline HM MaxLife 20w-50 and give it some runtime. Both available at Wally World.

 

[The_Eric]

The rings are cooked, get a set and gently hone the cylinder and you'll be much better off.

 

[joegreen]

Im thinking maybe the cylinder got hot enough that the oil control ring spring lost tension and is allowing oil to get sucked into the cylinder. I will have to measure the bore either with my t gauges at various points or i may be able to use a bore micrometer from my job.

 

[ripcord]

The cylinder could be significantly warped and out of round, too.

 

[kballowe]

Im thinking maybe the cylinder got hot enough that the oil control ring spring lost tension and is allowing oil to get sucked into the cylinder. I will have to measure the bore either with my t gauges at various points or i may be able to use a bore micrometer from my job.

I agree.

 

[The_Eric]

Im thinking maybe the cylinder got hot enough that the oil control ring spring lost tension and is allowing oil to get sucked into the cylinder. I will have to measure the bore either with my t gauges at various points or i may be able to use a bore micrometer from my job.

Probably the second ring.

 

[joegreen]

I opened the dipstick as an easy check and holy crankcase pressure batman. All the compression is going past the rings. I think i could have used it as an air compressor.

 

[asker123]

How much you paid for this? Hope not much.

 

[Fordiesel69]

I have saved many 2 cycle and 4 cycle engines with rings and a quick hone. The cylinder looks nice, you should be able to get away with just that.

 

[joegreen]

How much you paid for this? Hope not much.

Free

 

[The_Eric]

I opened the dipstick as an easy check and holy crankcase pressure batman. All the compression is going past the rings. I think i could have used it as an air compressor.

There will definitely be a lot going in inside the crankcase. If you pulled the dipstick while it was running then fully expect to get a face full of oil, even on a healthy engine. The crank, rods, pistons and cam will be throwing oil EVERYWHERE! Plus the pistons will displace a fair bit of the crankcase atmosphere as they go back and forth.

 

[joegreen]

There will definitely be a lot going in inside the crankcase. If you pulled the dipstick while it was running then fully expect to get a face full of oil, even on a healthy engine. The crank, rods, pistons and cam will be throwing oil EVERYWHERE! Plus the pistons will displace a fair bit of the crankcase atmosphere as they go back and forth.

Oh yeah I didn’t think of the displacement from the back of the piston motion. I guess that’s why the dipstick screws on with an o ring.