DR Field and Brush mower running problem

[Matthew Arnold]

We currently have a very very unhealthy mower. Its got a 443cc Single cylinder Briggs and Stratton engine. It had an oil change last year after i accidentally put 2 glugs of chain oil into the sump but only had 5 mins of running before i realised.

 

Do you think that may have something to do with it even though the system was flushed through and we had a new filter?

 

I know from the last time it was banging through the carb it was down to a damaged venturi. But this time there was alot of soot/carbon deposits and oil splattered in the carb inlet.

 

 

 

[ame=http://www.youtube.com/watch?v=ieHDellxjkQ&list=HL1376677035]Very sick DR 1 - YouTube[/ame]

 

http://www.youtube.com/watch?v=8RxV4fe0Rok&feature=youtu.be

[mad matty]

Give you a tenner for it!

[Rich2484]

Hmm. Could be a valve issue.

 

Could be a timing issue.

 

The video isn't really clear about the noise. Can hear a bang and pop then it stops. Could be a build up of fuel in the system. Running a bit rich. But This normally bangs out exhaust.

[Matthew Arnold]

Hmm. Could be a valve issue.

 

Could be a timing issue.

 

The video isn't really clear about the noise. Can hear a bang and pop then it stops. Could be a build up of fuel in the system. Running a bit rich. But This normally bangs out exhaust.

 

It was definately banging both ways which has got us thinking its a combination of valve and timing problems. The dealer is trying to find the clearances on the valves and also the timing.

[Rich2484]

Have you got the engine details to hand?

 

Model and or series?

[GardenKit]

For it to be banging out of the inlet manifold, I would imagine that the the inlet valve is not fully closing, either due to incorrect clearance, damage to seat, or carbon deposits.

Whilst checking the valve clearance, also check the security of the the rocker arm post.

 

Valve timing is not adjustable, neither is ignition timing.

 

 

 

See how you get on with that first.

[Matthew Arnold]

Have you got the engine details to hand?

 

Model and or series?

 

Its the Intek Series.

[Rich2484]

Ok. That doesn't really help much need the numbers. This is why.

 

Have a look.

 

https://www.briggsandstratton.com/us/en/~/media/Frequently%20Asked%20Questions/Engine/PDFs/Engine%20Specifications%20Chart_ms3992.pdf

[Matthew Arnold]

Ok. That doesn't really help much need the numbers. This is why.

 

Have a look.

 

https://www.briggsandstratton.com/us/en/~/media/Frequently%20Asked%20Questions/Engine/PDFs/Engine%20Specifications%20Chart_ms3992.pdf

 

Its the 210000 series with the vertical shaft.

[Rich2484]

Its the 210000 series with the vertical shaft.

 

So.004 cold and .006 hot on intake and

 

.006 cold and .006 on exhaust.

 

Not too hard to find out I guess.