25cc Weedeater won't run - I've tried it all!  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Conversions >> 25cc Weedeater won't run - I've tried it all!
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25cc Weedeater won't run - I've tried it all! - 7/3/2008 6:22:11 AM   
Number21


 

Posts: 4
Joined: 5/21/2008
From: ,
Status: offline 		I have a 25cc motor off of a Featherlite Weedeater. It has very low hours on it, and very high compression. I took it apart completely to inspect everything and it all looks good. It also has a strong spark, and is getting fuel on the spark plug.

Problem - the damn thing won't start! I am really pulling my hair out trying to understand what it could be. I even hooked it up to my electric drill for a starter - I get a puff of smoke every once in a while, but that's it. Never more than a puff.

Before I load this thing with .44 caliber holes, does anybody have any idea what could be wrong?
       Post #: 1

RE: 25cc Weedeater won't run - I've tried it all! - 7/3/2008 6:57:27 AM   
freeair


 

Posts: 303
Joined: 5/10/2008
From: queensland, AUSTRALIA
Status: offline 		you said it. you pulled it completly apart. did you replace all gaskets with new ones ? does this engine have a Walbro type carby ? hope you didn,t pull this apart. what you should do is fit new gaskets to all areas, make sure the coil is set at the correct distance from the flywheel, fit a new resistor spark plug then set the high carby needle to 2 turns out and the low at 1 1/2 turns out. remember 2 strokes do not like air leaks.

(in reply to Number21)
       Post #: 2

RE: 25cc Weedeater won't run - I've tried it all! - 7/3/2008 11:43:18 AM   
skip1320


 

Posts: 107
Joined: 6/19/2007
From: Egg Harbor City, NJ, USA
Status: online 		Fly wheel Key?

(in reply to freeair)
       Post #: 3

RE: 25cc Weedeater won't run - I've tried it all! - 7/3/2008 1:24:43 PM   
Jezmo



Posts: 792
Joined: 6/26/2006
From: Spring, TX, USA
Status: offline 		Yes, flywheel key, check it. One other thing, it requires a correct mixture to start not just "some" gas on the plug so if the carb is not metering correctly it won't run. I'd check the timing first though. (Flywheel key)

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(in reply to skip1320)
       Post #: 4

RE: 25cc Weedeater won't run - I've tried it all! - 7/3/2008 1:53:56 PM   
frenchie79


 

Posts: 619
Joined: 4/10/2007
From: Lancaster, WI, USA
Status: offline 		I second the flywheel key!

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Frenchie #193

(in reply to Jezmo)
       Post #: 5

RE: 25cc Weedeater won't run - I've tried it all! - 7/3/2008 2:48:09 PM   
chicks5


 

Posts: 35
Joined: 11/27/2005
From: Findlay, OH, USA
Status: online 		Just a thought, take a shot of starting fliud, not a lot just a little bit in the carb. If it will not fire on this, using your starter, recheck your flywheel key, spark distance and coils distance gaps. If it fires but will not stay running then I'd check your lines from the fuel tank, one is the draw line the other is a vacum line. Make sure the draw line is not kinked or plugged and connected to the right tube. Increase your low end set screw to 1 1/2 to 2 turns increasing 1/8 turn at a time. If nothing still.
Then I'd look at your seals and gaskets. Take in down and reassemble using Yamabond between the parts and gasket. Also check your pulse line hole in your carb and carb base to see it was aligined correctly or pluged. Sometimes the gasket will be off just a little and it will plug up enogh not to get enough draw. Hope this will give you some help. If after ALL THIS, take it down and strat all over again, you overlooked something. Weres my gun.

(in reply to frenchie79)
       Post #: 6

RE: 25cc Weedeater won't run - I've tried it all! - 7/3/2008 3:18:23 PM   
Laird SS


 

Posts: 216
Joined: 4/17/2005
From: Peoria, AZ, USA
Status: offline 		How about a lawnmower repair shop as the court of last resort?

(in reply to chicks5)
       Post #: 7

RE: 25cc Weedeater won't run - I've tried it all! - 7/3/2008 4:21:28 PM   
T.L.A.R. eng


 

Posts: 80
Joined: 1/2/2008
From: henry, IL, USA
Status: online 		I am not familiar with this particular engine, but some engines have a transfer port hole in the piston skirt. If you instal the piston backwards it will not run. Just a thought.

(in reply to Laird SS)
       Post #: 8

RE: 25cc Weedeater won't run - I've tried it all! - 7/3/2008 6:48:36 PM   
deadcell



Posts: 44
Joined: 8/16/2002
From: Myrtle, MS, USA
Status: offline 		Sounds like the key.
but if it was sheared and the flywheel was out of position, it would still spark when it was spun over.
And even then, wouldn't it at least pop and try to run?
I mean he said he had fuel and a good spark.
Maybe just sparking at the wrong time.

(in reply to T.L.A.R. eng)
       Post #: 9

RE: 25cc Weedeater won't run - I've tried it all! - 7/4/2008 6:19:12 AM   
buck1856



Posts: 737
Joined: 10/16/2002
From: superior, AZ, USA
Status: offline 		Check the front seal for tears or holes or any damage.Also check that the rear gasket is ok if this engine uses it.I converted a 25cc poulan off of a featherlite and i could start it on the 2nd or 3rd flip evrytime by hand.Also the keyway like others have said.Check for a crack in the spark plug by turning over in a dark room.

(in reply to Number21)
       Post #: 10

RE: 25cc Weedeater won't run - I've tried it all! - 7/12/2008 6:55:30 PM   
cgtotty


 

Posts: 1
Joined: 7/12/2008
From: , LA, USA
Status: offline 		Read the replies to your question and got some good advice for a similar problem- but I must ask - Why use a 44 ? A Winchester 30.06 180 grain Silvertip will blow one to smithereens - but a properly delivered blow from a 16 pound sledge hammer is quite soul satisfying!!!!!!!! Good Luck and have a Great Day !

(in reply to Number21)
       Post #: 11

RE: 25cc Weedeater won't run - I've tried it all! - 7/12/2008 8:09:30 PM   
erik58


 

Posts: 121
Joined: 1/11/2003
From: easthaven, CT, USA
Status: offline 		I found out the hard way that some of them spin counter clock wise Ifound this out after I converted it. Erik

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erik58

(in reply to cgtotty)
       Post #: 12

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