That's what make sense. The piston alone can cause a dipstick to do this.If you think about it, the piston is displacing air, when you open the dipstick tube, its going to suck air and push air out of the tube.
Now Scrub you know everything on YouTube is the gospel truth. So don't try on overtax PT's brain. <LOL> Just pulling you leg PT.
Stop & have a little think
As the pistons descend the crankcase is pressurised .
Air will take the path of least resistance so it is simply a case that lifting the weight of the dip stick requires less energy than opening the breather valve .
Next time you get one in with a known blown gasket, try the same thing & you should see that dip stick lift several inches if not get blown right out of the tube .
Glad I don't watch YouTube videos lately as my welding helmet is broken. Everytime I get near a camera I break it. Even the mirrors turn their backs to me.That's what make sense. The piston alone can cause a dipstick to do this.
Hey now, that's me in the video.
You are forgetting the push galley on OHV engines that pass right the head gaskets. Briggs OHV Inteks are one that regularly blows the head gasket between the cylinder and the push rod galley.Where does the extra pressure come from, since the only way from the combustion chamber to the sump is either through the valve guides or passed the rings.
Stop & have a little think
As the pistons descend the crankcase is pressurised .
Air will take the path of leat resistance so it is simply a case that lifting the weight of the dip stick requires less energy .
The extra pressure comes from the crankcase area decreasing because the piston is traveling back down.Where does the extra pressure come from, since the only way from the combustion chamber to the sump is either through the valve guides or passed the rings.
You are forgetting the push galley on OHV engines that pass right the head gaskets. Briggs OHV Inteks are one that regularly blows the head gasket between the cylinder and the push rod galley.
Was the fuel solenoid actually bad or was it just needing a good ultrasonic cleaning?
The extra pressure comes from the crankcase area decreasing because the piston is traveling back down.
That is IF it's blown around the edge, leading to the outside of the engine, right? Because the pressure inside the sump won't increase a whole lot, if it's an internal gasket leak. Will it?A blown head gasket will allow the crankcase to inhale much more air thru the leak on down stroke, so more crankcase pressure is developed.
Get an extractor (if you don’t already have one) and suck all that old bad cloudy fuel out, and blow out tank.That is IF it's blown around the edge, leading to the outside of the engine, right? Because the pressure inside the sump won't increase a whole lot, if it's an internal gasket leak. Will it?
Briggs don't normally fail from edges leading to the outside. I've only seen them leak between the valves and the opening to the push rods.
Valid point Sir..That is IF it's blown around the edge, leading to the outside of the engine, right? Because the pressure inside the sump won't increase a whole lot, if it's an internal gasket leak. Will it?
Briggs don't normally fail from edges leading to the outside. I've only seen them leak between the valves and the opening to the push rods.
Get an extractor (if you don’t already have one) and suck all that old bad cloudy fuel out, and blow out tank.
Suspected bad head gasket:
While at idle, quickly push throttle to WOT, then at WOT quickly go down to idle, waiting a few seconds in between. Does a puff of smoke come out? After running a bit, open dipstick and look for a little smoke coming out. Neither are definitive tests. Now perform a compression test and leak down test, watching for air escaping out of cylinder head with valve cover off. Just did one yesterday with 40% loss. Anything under 20% is acceptable. Single cylinder Briggs (ie: 31P677) is very common for bad head gasket.
I've seen them dual throat Nikki's do some weird things when they get upset.
Do You see a Nikki carb number on the side of yours?
Is that the Aluminum bowl or the Steel bowl Nikki? The reason I ask is the Aluminum bowl kit is different than the steel bowl Nikki and the steel bowl type has two different kit's.
One size does not fit all on the Nikki's, close but no cigar.
If it has a Nikki name on the carb I would try to re-kit before going the Clone route is another reason I ask.
Rebuild parts ordered. Now just waiting to see what I either forgot to order, or what wrong part I did order. lolOne thing to check with being a Nikki twin barrel is loose main jets.
Thank you for that. I'm going to save that Sawsilla website. Looks like they've got good prices.Here is some info about your later model Nikki BRIGGS aluminum bowl CARB that I have on file for reference. This info will answer some of your questions about the Briggs Nikki's. Note the L in your first picture, that is the left side reference for the jets location. The texture of that carb appears that maybe it has been in the Usonic few times before the pictures. The steel bowl Nikki's are the older models and are of at least two different designs. I do not have a very good track record of trying to use the China clone replacement Nikki's although I have taken parts from the clones such as o rings, etc and installed into the real Nikki and get a good run. Amazon Prime has a free refund policy if their carbs don't work correctly so that is usually where I get Clones for testing.
I have tested the Nikki carb using both of the jets as the larger size and got a good run. I've drilled the smaller to same size as the larger jet. I also use a gasket and RTV with good results at the intake instead of trusting the O-ring. Sometimes the intake two intake gaskets come in a kit, but if not I just make them.
These are rebuild links to assisting in cleaning, kitting, and where to find parts
AT A REASONABLE PRICE.
Try using Google Chrome as the browser for these links. Sometimes Microsoft edge will 404 out.
Tip: When looking up Nikki carb kit numbers use Briggs ahead of the part number INSTEAD of Nikki
Nikki carb rebuild links, videos and also a parts supplier on ebay.
Google Chrome will have to be used to access these links. Microsoft edge will not work.
https://bgsupply.weebly.com/helpful-videos.html
to look at parts, kit, jet, etc to go to different part number, etc click on the 3 bars menu in the upper left corner. You will have to choose Briggs and Stratton to see the Nikkii carb parts
https://sawzillaparts.com/carburetor-kits/briggs-stratton/
and another link to repairing the Nikki’s plus others
This is the steel bowl with the BLACK emulsion tube. Pay attention to the jet holes after you remove the top plate for cleaning them.
Your aluminum bowl is the later model and slightly different but some good tips here.
https://outdoorpowerinfo.com/repairs/
Firefox works as well, just saying..Google Chrome will have to be used to access these links. Microsoft edge will not work.
I use Brave. There's no commercials on Youtube.Firefox works as well, just saying..
I just recently stumbled across that sawzilla site.Thank you for that. I'm going to save that Sawsilla website. Looks like they've got good prices.
I just recently stumbled across that sawzilla site.
I ordered some Nikki Briggs stuff recently from them and shipping was only like $3.50 and tracking # provided and a fast shipper to me.
Tip about replacing the itty bitty jet o rings.
install the jet on a wire such as a straightened out paper clip and then take a needle nose plier (so you do not stab yourself with the sharp o ring pick) use a o ring pick and break the old o ring off then lube the replacement ring and use back of finger nail to get one side caught in the groove and then just roll it on around using back of finger nail.
I bought some Nikki Briggs jet o rings from this guy before and they work great, seem tougher than the ones in the kit and fit the jet grooves good). Some of the kit jet o-rings are too fat for the jet groove and emulsion tube.
When installing the jets I also use the paper clip wire to guide the jet onto the tube then I use a small nut driver that is little smaller in diameter than the jet and hand press into place. (nut driver is hollow inside so the guide wire goes up inside as a alignment guide for the little jet)
Sounds like you're installing the Jets the same way I do which is kind of hard to describe but if you're holding the carburetor and it's normal orientation you would be dropping them down the middle too. You just have to make sure that they go in properly and you seat them in the hole..I just recently stumbled across that sawzilla site.
I ordered some Nikki Briggs stuff recently from them and shipping was only like $3.50 and tracking # provided and a fast shipper to me.
Tip about replacing the itty bitty jet o rings.
install the jet on a wire such as a straightened out paper clip and then take a needle nose plier (so you do not stab yourself with the sharp o ring pick) use a o ring pick and break the old o ring off then lube the replacement ring and use back of finger nail to get one side caught in the groove and then just roll it on around using back of finger nail.
I bought some Nikki Briggs jet o rings from this guy before and they work great, seem tougher than the ones in the kit and fit the jet grooves good). Some of the kit jet o-rings are too fat for the jet groove and emulsion tube.
When installing the jets I also use the paper clip wire to guide the jet onto the tube then I use a small nut driver that is little smaller in diameter than the jet and hand press into place. (nut driver is hollow inside so the guide wire goes up inside as a alignment guide for the little jet)
Piston rings don't make a perfect seal, so there's always a certain amount of "blow by" gas that sneaks past the rings. This is why the engine has some kind of ventilation system - on automotive engines, it's called the PCV valve (positive crankcase ventilation). If this vent is obstructed, the pressure can be enough to lift the dipstick out of the tube.Where does the extra pressure come from, since the only way from the combustion chamber to the sump is either through the valve guides or passed the rings.
Piston rings don't make a perfect seal, so there's always a certain amount of "blow by" gas that sneaks past the rings. This is why the engine has some kind of ventilation system - on automotive engines, it's called the PCV valve (positive crankcase ventilation). If this vent is obstructed, the pressure can be enough to lift the dipstick out of the tube.
Sounds like you're installing the Jets the same way I do which is kind of hard to describe but if you're holding the carburetor and it's normal orientation you would be dropping them down the middle too. You just have to make sure that they go in properly and you seat them in the hole..
A lot of times I find this is put in from the bottom and not from the top..
Apparently this happens from the factory because I have had multiple ones where people swear it's never been worked on or serviced but yet it's stuck in the bottom which can fall out and be sitting in the bowl so that's why I feel it's a bad way to install the jet. But it will work either way.
I have the plastic emulsion tube in my hand or on the workbench, not on the carb when installing the jets. Using the little hollow tube nut driver and the wire allows for straightening a crooked press if watched or looked at afterwards closely. Some will want to seat slightly cocked sometimes.Sounds like you're installing the Jets the same way I do which is kind of hard to describe but if you're holding the carburetor and it's normal orientation you would be dropping them down the middle too. You just have to make sure that they go in properly and you seat them in the hole..
A lot of times I find this is put in from the bottom and not from the top..
Apparently this happens from the factory because I have had multiple ones where people swear it's never been worked on or serviced but yet it's stuck in the bottom which can fall out and be sitting in the bowl so that's why I feel it's a bad way to install the jet. But it will work either way.
You asked me???
BTW, "erbay?" You mean ebay, right?
Not sure of your question, I do not see the typo
sometimes referred to as flea bay or FLEECE bay.