So I replaced a bad Con Rod and installed new rings and am having problems getting the motor to start. This engine has been sitting for five years and I’ve finally got around to completing the rebuild. This is a 200000 seres OHV model that I bought new in 1993 in a Troybilt Chipper-Shredder.
After replacing the fuel line and old plug and cleaning the carb I was unable to get the motor to fire once after repeated pulls on full choke. But the engine would fire up and appear to run normally, albeit momentarily, with starting fluid. I removed the bowl, saw the fuel level to be normal, and found the main metering tube clogged with something (old gelled fuel or dirt?). I cleared that with a fine oxyacetylene torch cleaning wire and confirmed by shooting carb cleaner through the metering tube from the bottom. Then I reassembled tried to pull start the engine and experienced extreme backfire and numerous kickbacks coming through my pull cord running on gas. Clearly my timing seemed way off.
Today I have no time to work on it and am now planning ‘next steps’ for next weekend.
I’m thinking I next need to run a compression test to check timing. What should I expect from this engine?
If my flywheel is mistimed, like if the key is missing, then my timing would be way off. But I remember putting the key in the flywheel. I’ll need to disassemble to confirm.
I set the punchmarks on the cam and crank gear to be aligned per the punch marks. There’s no additional timing, correct? And the small removable cam driving gear on the crank can be reversed, correct? I didn’t check the removable gear to see if the alignment punches are identical on both sides.
Both push rods/rockers have 1-2mm of play after installation when not under load. I did not disassemble the rocker arms and did not check rocker play prior to disassembly. Is this much play normal? Prior to the con rod failure I never remember experiencing a backfire.
Thx for any advice in advance.
After replacing the fuel line and old plug and cleaning the carb I was unable to get the motor to fire once after repeated pulls on full choke. But the engine would fire up and appear to run normally, albeit momentarily, with starting fluid. I removed the bowl, saw the fuel level to be normal, and found the main metering tube clogged with something (old gelled fuel or dirt?). I cleared that with a fine oxyacetylene torch cleaning wire and confirmed by shooting carb cleaner through the metering tube from the bottom. Then I reassembled tried to pull start the engine and experienced extreme backfire and numerous kickbacks coming through my pull cord running on gas. Clearly my timing seemed way off.
Today I have no time to work on it and am now planning ‘next steps’ for next weekend.
I’m thinking I next need to run a compression test to check timing. What should I expect from this engine?
If my flywheel is mistimed, like if the key is missing, then my timing would be way off. But I remember putting the key in the flywheel. I’ll need to disassemble to confirm.
I set the punchmarks on the cam and crank gear to be aligned per the punch marks. There’s no additional timing, correct? And the small removable cam driving gear on the crank can be reversed, correct? I didn’t check the removable gear to see if the alignment punches are identical on both sides.
Both push rods/rockers have 1-2mm of play after installation when not under load. I did not disassemble the rocker arms and did not check rocker play prior to disassembly. Is this much play normal? Prior to the con rod failure I never remember experiencing a backfire.
Thx for any advice in advance.
