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You are watching: How to adjust valves on briggs and stratton 16.5 hp


Can"t modify again.....Okay we"re back to running unstable only now after a little of to run it starts do a kinda the squealing sound. I simply put the prior of the mower ago on, the hood cover and what no so it might be realted come that. I confirm the oil and also all looked fine. I"m seriously gaining fed increase here. I also got a backfire together I fired it up the 2nd time. I"m beginning to wonder if I acquired the valves changed properly. I offered a feelerguage to the ideal specs despite :/
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AVB will certainly be the one to guide you top top the valves. There is a one-of-a-kind procedure v B&S engines. Backfire on begin or shutdown can still it is in valves contempt off. Squeal might be a belt now that the deck is on.....if indigenous the engine, it"s no a happy sound. Check for any kind of "glitter" as soon as you traction the stick to check oil level.....just wipe the dipstick between your fingers and also look carefully for any type of shiny specks.Backfire top top shutdown deserve to be normal.......I have to go to half throttle prior to even thinking about turning the key off. If ns don"t carry the RPMs increase the engine will certainly backfire......but, i am to run a Kohler engine.
It seems prefer no matter the adjustment i make on the carb I obtain hunting and surging. I took the prior cover ago off and I haven"t had a squeal since so that ns assume was possibly something loosened connected to the former light and engine cover/hood. I"ve taken away fuel and added fuel and, with the exception of earlier, it still hunts and also surges and every now and also then half way backfires. The governor appears fine, it to be fine prior to with the old carb. I really don"t desire to dig earlier into the valves yet I may need to.Edit: I also checked the spark plug and it to be dry and also white.
I don"t recognize if this method anything but I saw take the spark plug out again in the procedure of checking the valves and also it broke off fully at the white part of the plug.
Sorry for all the extra write-ups but the edit switch goes away after a bit. Ns spark plug wasn"t the white after looking in ~ it again, just a little but it did break turn off so I"m walking to operation to the store and get a brand-new one. Ns re-adjusted the valves, greatly the intake. Upon check it this time it appeared a little tight. I looked up just how to readjust the valves top top a B&S. Take it to peak dead center then relocate the piston 1/4 inch and also adjust. Additionally watched rather a couple of videos before hand. If the intake to be a little too tight, could that reason the backfiring? ns guess I"ll discover out if I acquire to try it again before I see an additional post.
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"The governor seems fine"........if this is a brand-new carb and also is in proper adjustment the governor needs to be looked at a wee little bit closer. Broken spark plug is usually as result of not keeping the socket perpendicular to the plug. Lateral pressure is not an excellent on ceramics. Acquire a brand-new plug and try not to make the very same mistake......if i were to insurance claim I"ve never damaged a spark plug I would be a pretty good liar....:grin:
It"s still running the same also after readjusting valves. Still hunting and surging. Actually obtaining a bit much more backfire now. Both valves are readjusted to .005. Ex says between .005 and .007, intake says .003 and .005 therefore I finished up setting both at 5. How loose is the governor claimed to it is in exactly? It"s got good tension at complete throttle and an excellent spring however it"s loosened at low throttle.
Update: I damaged down and also called meh pappy to ask him about it lol. I was yes, really hoping come not have to bug him v it again however eh. His advice, due to the fact that I"ve adjusted the valves a few times to be to go ahead and mow through it and also see if the valves would seat in. I went ahead and also mowed our ago yard and it mowed fine. V the knives engaged that didn"t yes, really hunt or rise any and also cut my really tall grass favor butter. He also said it"s possible because the engine is so old the the manufacturing facility valve settings may not work specifically as a brand-new motor. Anyways, that"s whereby I"m at now. I"ll proceed to examine in with you guys however for now I think I"ll mow v it a time or two and see if it settles. I wouldn"t think it"d be too much off the it transforms over yes, really easy and fires ideal up.
Man ns wish this would certainly let me modify my posts after more than a few minutes lol. Okay last update till it"s running 100% or whatever. Something my dad stated to me previously just clicked about the factor it backfires is because the exhaust valve isn"t opening shortly enough. Right, ns knew that. Yet what I simply thought the was, every time I"ve changed the valves, I"ve adjusted them together. Staying in between the specs but still. It just dawned ~ above me that maybe the intake valve is fine but the exhaust valve needs to open sooner. So tomorrow I"ll probably test mine theory. Ns don"t understand what this will do for the hunting however if i can eliminate the backfires altogether, that"d it is in a good start. Sorry for every these posts guys and also thanks for all your aid so far.
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15 minute window to edit posts.....don"t worry around making added posts. Turning the flywheel in the direction of engine rotation, carry the piston come TDC (Top Dead Center) on the compression stroke. Insert a dowel or slim screwdriver, as a gauge, into the spark plug hole and also keep transforming the flywheel until the piston is 1/4" down from TDC. Change the valves per specs. 1/4" from TDC is vital for B&S engines once adjusting valves.Depending top top the age and wear on the engine I"d store the adjustments ~ above the chop side......go through the reduced numbers. If the video camer is worn friend won"t obtain the background or expression needed.
Thanks. Ya I"ve been turning the engine 1/4 previous TDC, sticking a coupler driver in to feel whereby it is. The valves were originally on the tighter side and also I feel like that was much better than how they are currently so I"m going to execute one last adjustment back to the tighter side as you say but within the specs. Then, as long as it"s not totally running choose trash, I"ll probably provide it a few mows to view if it handle in.

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Just readjusted the valves because that the last time for a if lol. Took her advice and also put lock both a little much more towards the chop side, the exhaust a bit more to shot and remove the backfire. Fired best up, still hunted a bit however then mostly smoothed out, not completely but definitely much better than last night. Still gaining a slight backfire (puff) v the carbohydrate every therefore often, largely when adjusting the throttle down even going slow. Both valves are still in spec, exhaust is at 5 and intake is at 3. One point to note that"s interesting is the feeler gauge is kind of difficult to at first get in between the valves, no hard but pretty snug. But once it"s in climate it feels together it should. Ns feel like probably the valve pointer where I set the lash, probably the edges are a bit warn, they"re pretty sharp. Whatever turns over straightforward though. Ns turned that a few times by hand and also rechecked the settings. Anyways, I"ll run it favor this because that a while and also see if it settles in. I"ll check back in in the close to future v an update.