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Craftsman Lawnmower (only 1 year old) Not Completely Smooth - Video Enclosed

  • Last Updated:
  • Apr 21st, 2017 11:27 am
Deal Addict
Jan 25, 2007
1632 posts
382 upvotes
Paris
ChubChub wrote:
Apr 19th, 2017 1:18 pm
Clean the carb, and run proper fuel; ethanol be damned, higher octane fuel will result in less power, and those carbs are pretty questionable even with proper fuel. As well, it sounds like the timing is wrong on the engine (which should basically be impossible); did you happen to stall it on a root or something?

Might want to replace the plug as well; should be fine, but running like that, it won't be nice for long.
Higher octane less power?

An engineering classmate of my brothers who works in traditional gasoline told us to only use mid or high grade gas in small engines as the preservatives in regular gas were only good for 30 days until the gas started to break down vs mid and high are 6 months. So buy a gallon of fuel at the beginning of the season and the gas has started to go bad by August.
Gbill2004: Thanks but I'll just smell the couch before/if I buy it.

jonnyb: I go in there like PICASSO and toss the glue everywhere, I don't care what house I'm on.
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User avatar
Oct 9, 2010
1308 posts
214 upvotes
Windsor
Jerico wrote:
Apr 19th, 2017 1:22 pm
Higher octane less power?

An engineering classmate of my brothers who works in traditional gasoline told us to only use mid or high grade gas in small engines as the preservatives in regular gas were only good for 30 days until the gas started to break down vs mid and high are 6 months. So buy a gallon of fuel at the beginning of the season and the gas has started to go bad by August.
Less power, but more resistance to detonation ... so, you can run higher compression without detonating, so you get more power. However, if you're not modifying the combustion chamber, or somehow getting more air in there (turbo/supercharger ... porting), you'll end up with less power.

As for how long gas takes to go bad, I'm not sure; those numbers seem to be VERY conservative. My 600RR had 91 octane fuel in it (minimum recommended octane) for 5 years while I was across the country (not started once); when I came home, it started fine, and I wasn't getting any knocking.
Penalty Box
Feb 9, 2006
6850 posts
1179 upvotes
Brampton
Jerico wrote:
Apr 19th, 2017 12:19 pm
How do you test for ethanol?
A cheap way to do it but you ruin the gas is to take a small amount and pour water in it.

Note how the gas and the water obviously settles in to their specific gravities.

Shake it, give it time if the water section increases in height there's Ethanol. Water pulls the Ethanol out of the gas.
Deal Addict
Jan 25, 2007
1632 posts
382 upvotes
Paris
ChubChub wrote:
Apr 19th, 2017 1:29 pm

As for how long gas takes to go bad, I'm not sure; those numbers seem to be VERY conservative. My 600RR had 91 octane fuel in it (minimum recommended octane) for 5 years while I was across the country (not started once); when I came home, it started fine, and I wasn't getting any knocking.
I agree they are conservative. I think that is when the gas starts to break down.

I would say the fuel issues only started 3-4 years ago like the attached video with a rotten fuel line from a sled.


Plus storing my ZX6 next to a ZZR250 I ALWAYS had Spring gas issues with the 250 whereas the 600 fired right up. Fouled the plugs on the 250 even. That bike was otherwise bullet proof.
Gbill2004: Thanks but I'll just smell the couch before/if I buy it.

jonnyb: I go in there like PICASSO and toss the glue everywhere, I don't care what house I'm on.
Newbie
Apr 3, 2008
80 posts
9 upvotes
Ajax
Jerico wrote:
Apr 19th, 2017 12:19 pm
How do you test for ethanol?
You can buy test kits but you don't have to.



This is just an example.

Obviously most people don't have a graduated cylinder but you can just use a water bottle, etc and mark the amounts on the bottle with a marker.

Here is a terrible quality video but it shows it with a water bottle.

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