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Lawn Mower Help Please???

post #1 of 7
Thread Starter 
Hi all:

Unlike my last mower with which you could vary the throttle speed, my present one has a throttle speed that is factory pre-set. Unfortunately this speed is WAYYYYY too slow for my taste. Guess this is considered a modern advancement, mcuh like the newer "non-spill" plastic gas tanks, which seem to me to be anything but non-spill.

Question is, can anyone tell me how I can adjust the preset thottle speed on the mower? It is a one year old Sears/Craftsman 4.5 HP push mower which is NOT self-propelled.

Thanks.
post #2 of 7
Without seeing the mower I'll guess if it has a steel throttle cable maybe you can shorten that up to pick up the rpms.
post #3 of 7
Thread Starter 
Stoker:

That's the problem. NO throttle cable. Rev speed is pre-set at the factory. I want to try to up the preset speed.
post #4 of 7
Bob,

Just an FYI...I have a Sears mower that I had for 7 years now..Works great, but I too wanted to speed up the blade. So I tapped the throttle handle a little bit with a hammer to get it to move and it worked great. Fast forward three weeks and I'm mowing and all of the sudden the gas tank and upper housing of the motor starts vibrating alot and oil is spitting out!! i thought I needed a new machine, but what happened was that screws came loose, thats why the motor was vibrating which lossened the oil line. It was all associated with speeding up the machine. So be careful with that...too fast could hurt it more than help.
post #5 of 7
Quote:
Originally Posted by BobEver
Hi all:

Unlike my last mower with which you could vary the throttle speed, my present one has a throttle speed that is factory pre-set. Unfortunately this speed is WAYYYYY too slow for my taste.

Question is, can anyone tell me how I can adjust the preset thottle speed on the mower?
Thanks.




When you hit thick grass (under load), does it speed up... It should, like a generator under load. Should be a butterfly under the air filter, with a spring. Take off the air cleaner, probably have to put the screw back in the intake to run right, and look for it running. Even just sitting there you should see a little movement. Very light touch, pull back on that butterfly valve a tick (should be on top of the intake), and you should hear it speed up if you found the right piece. That is "supposed to increase rpm's" under load. If you like, and all that is as described, you can cut a little off that spring, with needle nose turn a loop down to re-attach, and it should speed it up. Going back is easy, if it runs too fast, just pull/stretch the spring out a little.

Keep in mind, this is general knowledge, and not specific to your mower, as I don't have one. This is one way I "super tune" some of my equipment, and I take no responsibility for it not working (but it should ) Not exactly something Sears is going to encourage either

Be "very" careful if you are not familiar or comfortable with working on equipment (especially if it's running), you probably have a friend that is

Safety first!
post #6 of 7
Thread Starter 
Wizard Dude:

Thanks for your reply, and no it does NOT speed up under load with thick grass, thats why I want to up the revs. Will give what you suggest a try.
post #7 of 7
If it's that spring that's the issue, it's all to easy during assembly to stretch it a bit, and not get those extra rpms when needed.

Not that they were put together by anything but technical perfectionists
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