Hello everyone, new to the forum... Looked for this subject already, but could not find it.
I'm trying to fix my friends TB240 Self Propelled mower that is having kick back issues.
Honda Engine
1. Visually inspected flywheel and key.
a. No obvious sign of being out of alignment
2. Pulled and inspected spark plug.
a. Plug used, but dry, minor corrosion, Spark plug does spark.
3. Checked top dead center of piston and Magnet alignment.
a. Piston at Top Dead Center, Magnet on flywheel is just leaving coil magnets
4. Pulled the flywheel to check for position and key problems.
a. Flywheel broke from pressure of the pulley.
b. Drive shaft Key is seated and does not appear to be out of alignment.
c. Some minor play on the flywheel and the Key, but this looks normal. Can not get feeler gauge in to check tolerance
5. Purchased brand new flywheel and installed
a. During installation noticed same play between the fly wheel and the Alignment key. The key is set firmly on the shaft and is square.
b. Did my best during installation to keep pulling with same gap on each side of the alignment key. This play is so small I doubt most people would notice it. Of Coarse it doesn't move once pressed onto the shaft.
6. Same Kickback
7. Recheck top dead center and magnets.
a. same results as above
8. Check Blade and shaft for straightness.
a. Blade installed correctly and tight.
b. No obvious sign of blade damage
c. pull cord with no sparkplug and no obvious sign of alignment or bent shaft.
9. Check for carb leakage
a. Turned off fuel supply and removed feed line.
b. pulled spark plug.. still dry... pulled cord several times and burned out cylinder (No sign of fuel in the cylinder)
c. Put the spark plug back in and it still has kick back. I don't believe this is a cylinder filling up with a leaking fuel valve
This thing kicks back on the first pull and every pull. It does it weather it's trying to start or not trying to start. I've read a lot of threads on this subject and can't figure this thing out. The only thing I can think of is that the play in the alignment key is really that important. If I had to guess it less that 1/2 a millimeter.
I'm trying to fix my friends TB240 Self Propelled mower that is having kick back issues.
Honda Engine
1. Visually inspected flywheel and key.
a. No obvious sign of being out of alignment
2. Pulled and inspected spark plug.
a. Plug used, but dry, minor corrosion, Spark plug does spark.
3. Checked top dead center of piston and Magnet alignment.
a. Piston at Top Dead Center, Magnet on flywheel is just leaving coil magnets
4. Pulled the flywheel to check for position and key problems.
a. Flywheel broke from pressure of the pulley.
b. Drive shaft Key is seated and does not appear to be out of alignment.
c. Some minor play on the flywheel and the Key, but this looks normal. Can not get feeler gauge in to check tolerance
5. Purchased brand new flywheel and installed
a. During installation noticed same play between the fly wheel and the Alignment key. The key is set firmly on the shaft and is square.
b. Did my best during installation to keep pulling with same gap on each side of the alignment key. This play is so small I doubt most people would notice it. Of Coarse it doesn't move once pressed onto the shaft.
6. Same Kickback
7. Recheck top dead center and magnets.
a. same results as above
8. Check Blade and shaft for straightness.
a. Blade installed correctly and tight.
b. No obvious sign of blade damage
c. pull cord with no sparkplug and no obvious sign of alignment or bent shaft.
9. Check for carb leakage
a. Turned off fuel supply and removed feed line.
b. pulled spark plug.. still dry... pulled cord several times and burned out cylinder (No sign of fuel in the cylinder)
c. Put the spark plug back in and it still has kick back. I don't believe this is a cylinder filling up with a leaking fuel valve
This thing kicks back on the first pull and every pull. It does it weather it's trying to start or not trying to start. I've read a lot of threads on this subject and can't figure this thing out. The only thing I can think of is that the play in the alignment key is really that important. If I had to guess it less that 1/2 a millimeter.