I have a 2013 trojan Bilt Pony 42" lawn tractor through the Briggs and also Stratton 17.5 engine. That does the thing where once i rotate the crucial it turns a little stops in ~ compression transforms a little more stops again in ~ compression, etc. If ns take the spark plug out and also turn the vital it turns over normally. The battery is good and every thing I've learned by googling and watching youtube videos claims to change the valves. I've adjusted both valves to .004 together one youtuber suggests, and also to .004 intake and also .006 exhaust together others speak ). I've make the efforts both setups several times and also keep having the same trouble when I put the spark plug ago in and turn the key. Both the intake and exhaust enter and also exit near the optimal of the valve real estate so I'm not particular which valve is which. One video clip I watched which to be for riding mowers in general and not Troybilt Pony claimed the exhaust valve is the one that is ~ above top and the input valve the bottom one - is this correct?I do notification a sulfur / rotten egg smell when I shot to start it - go this aid diagnose something ?I'm in ~ a lose - any type of suggestions ~ above what I might be doing wrong or whether it could be a trouble other than the valves prefer the solenoid or something would be substantially appreciated. :confused2:I job-related on my own cars when they require repaired (have done head gaskets, brakes, etc.) yet this is the first time I've make the efforts to adjust valves.

You are watching: Briggs and stratton 17.5 hp valve clearance


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Briggs vertical space intake ~ above top. Every one of them. Girlfriend watched the vids and also turned the flywheel for this reason they to be at the appropriate position as soon as you made the adjustments ??
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ILENGINELawn Pro
JoinedMay 6, 2010Threads27Messages8,074
Briggs single cylinder upright OHV engine usage a crossflow head, Which way the intake is on the bottom. If you space sure you have the valves readjusted correctly, climate while transforming the flywheel gradually watch because that the intake valve/ bottom to bump turn off seat slightly just before TDC compression. You could have a case where the flyweight top top the camshaft is broken and also the compression relax no longer works, and also will require replacing the camshaft.
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Scrubcadet10Moderator
Staff member
JoinedSep 24, 2017Threads181Messages5,077
I always thought friend were supposed to collection them 4 come 4? I'm sure I'm dorn though, and do girlfriend think it can be the compression release on the cam? much more thane most likely not, yet sometimes the spring will come off and the CR won't work... However it does sound choose something in the head/ valve mechanism.....:smile:ILENGINE, it shouldn't call for replacing the entire cam, just the comp. Release. It is riveted in on many engines. However in some situations people just go front on put a brand-new cam in, it's a lot of simpler.

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ILENGINELawn Pro
JoinedMay 6, 2010Threads27Messages8,074
I go 4 over the summer this year. In all instances the decompression mechanism was in about 10 piece laying in the sump that the engine. On some engines the valve clearances space .004-.006 for both on others it is .004-.006 because that intake and also .005-.007 because that exhaust. Therefore most world will simply say 5 and also 5.Briggs doesn't typically offer just the decompression system as a instead of part.
T
Tinkerer200Well-Known Member
JoinedMar 14, 2015Threads4Messages838
"ILENGINE, it shouldn't require replacing the entire cam, simply the comp. Release. That is riveted in on most engines."Let me understand where to acquire the parts.Walt Conner