Did all tune-up runs a little too good. How do i turn the rpm's down over revving unless I'm in real thick grass

check belts for slippage not slipping and deck pulleys good --possible tune up -- carb or fuel delivery needs work

if you think it is a valve problem briggs and stratton website has a page that gives all the specs. for intake and exhaust vale setting. you will need to know your engine size and model number.

your belt is slipping. Have your dealer fix it.

It may stall for many reasons. Is the frass too tall, too thick or the stems are too solid? The whipper can cut most grasses but some are hard grasses that put considerable pressure on the machine that it locks the spinning string feed, therefore stopping it. Other reasons are due to the type of fuel (fixing inconsistencies, too much or too little oil in the fuel or the fuel has been left out for too long and is somewhat a little exhausted. You note this by hard starting. The engine could be labouring because it's not tuned properly. Try starting it and do a manual tune-up. See it stays running at idle and then do some accellerations before it is taken out to cut grasses.

You are hitting the rev limiter top range, which cuts off your ignition.

I have a 2001 Grand Cherokee and the problem drives me crazy, but it is the way the car is designed- as soon as you hit the rev limit, it shuts down ignition and your jeep will "buck" - a real pain when you are trying to accelerate into traffic!

You have the 4.0L straight six engine, yes?

If so, please take my advice and learn to live with the minor annoyance of the rev limiter- that engine is IMHO the best Chrysler ever made (nearly "bulletproof"!) and it was so reliable you cannot even get it in a jeep now! For decades, that engine was used in welders, tractors, generators...and yes, jeeps... and it is a favorite among mechanics for its durability!

To begin with, if you are revving a cold engine to 6000 RPM, you are asking for a blown engine. Most OBD vehicles are equipped with a rev limiter that will cut off fuel at 3000 to 4000 rpm to prevent you from over-revving your engine and blowing it up. If yours is revving to 6000 RPM cold, then the rev limiter, for some reason is not working while it is cold. I have no explaination for this. The best thing I can tell you is to stop revving your engine so high when it is cold unless you really want to see what an engine looks like after is has gone off like a grenade.

Hello,

The reason the blade slows down when the grass gets thick is simply because the mechanism operating the blade is weak and cannot move fast when on thick grass.

I suggest you troubleshoot the mower. After that, the blade should work fine when the grass gets thick.

Also, some mowers normally gets slow when grass gets thick, so after troubleshooting, if the mower does the same, then you already know it has to be slow when trying to cut thick grasses.

Take care

it sounds like the spring for throttle return is either disconnected or broken...good luck...Lee

With many engines, you can start by screwing them all the way in. Turn each about a half turn out at the same time. try to start it. Turn a little more each. Again start it. Eventually, it will run but listen to how the engine runs. It should not be super revved up nor should it sound like it is barely staying running. Adjust one screw at a time to fine tune it once you get it to stay running. Either it will need more air or more gas. Take it for a spin..how does it cut? Does it bog down in normal grass? You may need to give the gas another half turn. Half turns on the screws to 1/4 turns once you fine tune it. Once it purrs nicely, see how well it cuts without bogging down. I hope this helps. This is the way I adjust all of my smaller engines. Make sure you check your plug and ensure it is still good before you do this and that your gas is not spoiled too. Please let me know if I have helped or if you need more help.