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How do you increase the rpm on a Craftsman model 12a-469Q799 lawn mower? Lawn mower seems to be running slowly and underpowered.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: craftsman lawn mower

I had both my front wheels wobbly - so I cut shims from a tin can - wrapped the axle of the wheels with the shims and then inserted them back into the plastic bushes. It was a snug fit - but helped quite a lot.

Posted on May 27, 2008

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ccrozier_agr
  • 36 Answers

SOURCE: broken starter cord lawn mower #944.368300/craftsman

Please note ! patients is required with this one !
Hi, remove the recoil top cover with the recoil attached. ( DO NOT TAKE OUT THE SPOOL OR YOU COULD HAVE THE SPRING GET YOU IN THE FACE)
Remove old cord.
With your new cord lace it through the recoil spool centre hole with a knott on the end.
now depending if the recoil winds in clockwise when spool is facing you wind the cord around it a few times by turning the spool clockwise,
Then put the cord in the notch at the side of the spool & wind the spool & cord anticlockwise about twice the number of turns of cord (this should tension the spring).
Take your end of the cord & lace it through the hole outside of the casing & fit you pull handle.
But hold the spool firmly untill the cord has a good knott on the end of it.
(Sometimes I see the guys here putting a loop in the cord to stop it sliping in while they tie a knott on the end of the handle.)

Posted on Nov 29, 2008

  • 6 Answers

SOURCE: Lawn mower will not start and run

Sounds like a clogged carb or a cracked primer bulb. I would install a carb rebuild kit and new primer bulb if your mower uses one.

Posted on May 31, 2009

  • 1 Answer

SOURCE: I need the owners manual for this lawn mower Craftsman 917.377220 6.75 HP

Here a website that gives a list of Craftman Lawn Mowers and it owner manuals. Hope it help, its were I found my manual.

http://www.craftsmanlawn.com/Walk-Behind-Mowers/

Posted on Jun 22, 2009

bargainbin2
  • 123 Answers

SOURCE: 13.5 hp Craftsman lawn mower 5-speed

Here is a picture to help you place it on right. There are two deck designs pick yours.
78eb3cc.jpg 208abad.jpg

Posted on Aug 29, 2009

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I know this is an old post but I figure maybe my solution will be found by someone else doing a Google search and it can help them. Hopefully, you've gotten yours fixed in the 10+ months since you asked this.
Anyway, if you remove the top plastic shield from the mower (two screws hold it in place, plus a small cover near the air filter that needs to be removed) you will see a small spring that attaches to a tab at the front of the mower. If you bend that tab forward it will put more tension on the spring and increase the engine speed. You'll know if you are looking at the correct spring if you lightly press on the spring and the engine speed increases.
It is a good idea to monitor the adjustment with a tachometer. My owner's manual says the engine has a 3,100 max rpm. You don't want to set it above the specified rpm or you'll probably burn the motor up in a short time. I set mine at 3,060 rpm. It's hard to get it perfect but I figured slightly low is better than too high. Mine had been running at 2,800 rpm.
I bought a small engine tach on eBay for around $9. The wire wraps around the spark plug wire 4-5 times and then you can read the engine speed. It also keeps track of how many hours the engine has been running. I figure that will come in handy for oil change intervals so I permanently mounted it to the mower. It almost looks like it came that way from the factory. :-)
Here's the tach I bought: Hour Meter Tachometer 2 & 4 Stroke Small Engine

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