6 HP tecumseh PROBLEMS?

[bikerboy1000]

Want start, got it from a buddy, i cleaned carb, and changed oil, new plug in it.. It ran fine for one day, the next day, it want start at all.. Spraying fuel out carb top (a mist) right where throttle cable hooks up.. And when i pull it to start it, sometimes it will yank back on me? I think maybe timing? I put a lil gas in cyclinder, still want start? Any help would be great?

 

[Doc Sprocket]

If you supect a timing issue (and the yank back could be a hint), pull the flywheel off and make sure the key is intact.

 

[Bluethunder3320]

The spray of fuel is just from when you choke it it sucks exessive gas into the intake and some just gets pushed out. Try un flooding it and if it still kicks back check the flywheel key. The kickback could be from a flooded engine. Does it pop or backfire? Any spark?

 

[Russ2251]

Did engine come off of a wood chipper per chance?

 

[Blazkowiez]

Pull the flywheel, I think you may have sheered the key.

 

[Russ2251]

Before wasting time on pulling flywheel, what did engine originally come off of???

 

[Doc Sprocket]

Okay, I'll bite- What's special about a woodchipper, Russ?

 

[bikerboy1000]

It come on the go kart when he bought it new... Its not flooding, gettin a good spark.. Ill check the key next day i get off.. Thanks

 

[bikerboy1000]

No choke on the carb, it has a primer buble...

 

[Russ2251]

What's special about a woodchipper

Woodchippers use a lighter (not lightened) flywheel.
Lighter flywheel has a lack of inertia.

sometimes it will yank back on me?

This has come up before.
All the 'experts' agreed that it was a sheared key.
I (not being an expert) disagreed.
Upon disassembly, it was discovered that key had NOT sheared. Engine was indeed behaving normally.

 

[Doc Sprocket]

Thanks, Russ, for the explanation. Please note that I do not claim to be an expert, nor did I insist that it was the key, I simply suggested an inspection of same.

 

[slideways]

Check the valve lash.... before you to go the trouble of checking the flywheel key. Very rare to shear a key on a go kart. Unlike a push mower or a chipper or something where the motor is working directly against the object being worked.

The lash is one of the only things that can lost adjustment during riding and cause this kick back and backfire like you describe. Ask if you don't know how to do this.

 

[Russ2251]

Please note that I do not claim to be an expert

Do not misunderstand. I was not inferring anything personal.

 

[Doc Sprocket]

Duly noted. I am left wondering why the lighter flywheel on the woodchipper... Wouldn't you want the extra inertia?

 

[Russ2251]

Wouldn't you want the extra inertia?

Absolutely...That's where the chipper wheel comes into play. It is heavy and is always engaged.
Make sense?

 

[Doc Sprocket]

Gotcha.

 

[r97]

a wood chipper prob has a lightened fly wheel because its spinning a huge metal wheel with blades which acts as a flywheel, if it had a normal fly wheel the "chipper" wheel would just be extra weight to move, but if you lighten the fly wheel the "chipping wheel" adds extra inertia to compensate for the lost inertia of a lightened fly wheel.

EDIT: beat me to it!

 

[Russ2251]

As slideways was saying

Very rare to shear a key...

It has been my experience that keys shear because of improper torquing of flywheel nut. Keys do not just simply shear because they "feel" like it.
Cause and effect.

 

[Doc Sprocket]

From my own experience, mechanical impact will do it too, such as lawnmower blade striking immovable rock.

 

[Russ2251]

mechanical impact will do it too

Agreed...I purposefully left that out as this is (supposedly) a kart engine.