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Small 2 cycle engine help needed

Old 11-01-2008, 08:31 PM
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aviatordave
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Build Review Small 2 cycle engine help needed

This is my snow thrower. Just a small 2 cycle engine.

Watch the video, the engine does not want to run very well with choke off, but runs ok with choke on.

It ran this way last winter and would completely stop working after 5 minutes. With choke on because it would not run with choke off in the cold.

For the video, the gas tank is full (mixed 40:1) and the engine is warm, also its about 65 degrees out.

Any suggestions?


http://www.youtube.com/watch?v=DW9rT4a-EUc


(hmm I cant embed the video in this post...)
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Old 11-01-2008, 08:40 PM
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Twmaster
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If it wants to run well with the choke on that usually means you have an air leak between the carb and plastic carb mount or in the body of the carb.
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Old 11-01-2008, 08:47 PM
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If you have some choke/carb cleaner you can test for this by spraying a bit around the base of the carb (away from the air intake). If the thing changes speed while squirting you've found the problem.

If that were a 4 cycle briggs I'd say you had a very dirty carb and the governor was wigging out.
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Old 11-01-2008, 08:48 PM
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So I should remove the carb from the engine and look for cracks? It is getting too much air with the choke open?

(whoops...we posted the same time)

ok
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Old 11-01-2008, 08:49 PM
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I'd try the spray test first. No sense just pulling the carb off all willy-nilly like.

Whose engine? What size (in cc)?
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Old 11-01-2008, 08:50 PM
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lemme look. its an off brand, no stickers...brb
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Old 11-01-2008, 08:57 PM
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Check your fuel lines too. Many of those little 2 strokers come with gas lines like on RC stuff. They get old and leak. The problem could be backwards from what I am thinking.
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Old 11-01-2008, 09:00 PM
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aviatordave
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Fuel lines looked good, I was hoping it would be something easy like that.

this is off the data plate:

NOMA OUTDOOR PRODUCTS
JACKSON TN

MODEL# D2030070
SERIAL# 5002206331115
CODE# 3284

--------------------------------------

I am trying to google these #'s but aint getting too much info.

Anyone else wanna try?
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Old 11-01-2008, 09:22 PM
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There should be an emissions plate on the engine that may have more info.
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Old 11-01-2008, 10:58 PM
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Hi Dave,
'been a pro 2-cycle tech for 25yrs+ now......what you're describing sounds a lot like the fuel pump in the carb is not doing it's job. Could be dirty or clogged.
Is the fuel tank below the eng.......where the pump has to pull it up into the carb? Simple little engine arguing with ya huh?

lemme know, I can help

--Ray
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Old 11-02-2008, 01:30 AM
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the fuel tank sits above the carb, looks like gravity fed. There is a float under the carb that i assume allows fuel into the bowl.

does that make sense? i can attach a pic tomorrow when we get some sunlight..
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Old 11-02-2008, 01:39 AM
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gfdengine204
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Dave,

You could avoid this entirely by turing your dishwasher into a snowthrower........






Just hand her a shovel.
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Old 11-02-2008, 01:52 AM
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Dave first things first. New fuel and new spark plug. What does the plug look like when you pull the old one out? Check the easy stuff first. Most times that is all that's wrong(Muffler loose, carb loose, head bolts loose,
How old it the blower? How many hours on it? Muffler or spark arrestor screen could be clogged. Is there a clunk in the fuel tank. Can you see it?Sometimes they will break off. Is there a vent on the fuel cap. Is it open.

Sometimes the float will stick to the bottom of the bowl if you let fuel sit in the bowl for a long time. If that is the case you need to remove the bowl (one bolt) and clean the bowl and needle and seat with carb cleaner.

Very first thing to do remove plug and let us see a picture of it. Run the motor with the choke off for a couple of minutes then remove the plug. This will tell us if it's running rich or lean. If you can take a picture of the electrode this would help.

Last edited by airmail wf; 11-02-2008 at 01:08 AM.
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Old 11-02-2008, 01:13 AM
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TLyttle
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Good ol' 2-stokes, I love 'em... If the chase outlined above by airmail doesn't find a problem, the next step is the crank seals. After awhile, they dry out and allow extra air into the base. I have won a number of engines (including a 30hp outboard) because of that, simply because people will not be bothered to change them. I do the change, voila, one more great-running engine...
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Old 11-02-2008, 01:45 AM
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I wonder if you can add gas stabilizer and carburetor cleaner to 2cycle fuel.?.? I add some to my 5gal can of regular fuel. Same lawn mower for 10 years now running strong. Usually one pull start. Could be common but I'm happy.
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Old 11-02-2008, 02:37 AM
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airmail wf
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Originally Posted by Pudknocker71 View Post
I wonder if you can add gas stabilizer and carburetor cleaner to 2cycle fuel.?.? I add some to my 5gal can of regular fuel. Same lawn mower for 10 years now running strong. Usually one pull start. Could be common but I'm happy.
Sure you can, but you need to do this before a problem starts. Not sure on the carb cleaner.
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Old 11-02-2008, 03:08 AM
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ok....I'll take a pic of the plug tomorrow. Gas is pretty fresh, I'm using 10% ethanol blend as most Iowans do...
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