Charlie Smith 192 #1 Posted June 25, 2016 Hello all, the picture I have attached isn't of mine. But it's as good as identical! I've been going crazy all day! I've changed spark plugs cleaned carbs air filters etc everything and I cannot get the engine to fire, not even cough, the spark is very strong and efficient? However no go? I've even tried pouring petrol in the plug hole but no luck? Nowhat to me this isn't normal? Surely a spark and petrol would at least make a bang? Checked compression and that's strong. I'm lost can you help? Cheers Share this post Link to post Share on other sites
C-101plowerpower 548 #2 Posted June 25, 2016 sheared flywheel key? spark timing wrong? Share this post Link to post Share on other sites
nigel 1,876 #3 Posted June 25, 2016 Yes think Koens got it charlie Share this post Link to post Share on other sites
Charlie Smith 192 #4 Posted June 25, 2016 I never thought about timing, flywheel is dead solid on the shaft as have been in there having a look, but what's best then? Use a puller to get the flywheel off and have a look? Share this post Link to post Share on other sites
C-101plowerpower 548 #5 Posted June 25, 2016 loosen the flywheel nut to the end of the crankshaft, hold the flywheel and with a little hammer(or a chunk of aluminium like i use) rap the end of the crankshaft, two or three raps should pop the flywheel right off 1 Potash123 reacted to this Share this post Link to post Share on other sites
Potash123 26 #6 Posted June 30, 2016 You have a similar problem to me. I have also changed the relevant parts and cleaned the carb. It did fire once before that with petrol down the carb, but not since. Please update this thread with your progress. Thanks. PS I am not even getting a wet plug. Share this post Link to post Share on other sites
Wristpin 400 #7 Posted June 30, 2016 What's the history? Is it new to you and do you know what's been done to it? Has it ever run in your possession? If similar to the image it could be points ignition but more likely electronic - Magnetron. May be a Magnetron sticker in the centre of the debris screen above the flywheel. What's the compression like? Because of the action of the decompressor its difficult to check the compression by pulling the rope. Fold the handles, stand it on its tail, remove and ground the plug lead and then with a gloved hand bounce the blade against compression in the opposite way to normal rotation, ie clockwise when looking at the blade. Doing that fools the decompressor and gives a more accurate view of the state of play. You should get a pronounced bounce. If it's just soggy it's possibly time for a valve job. If you know anyone with a leak down tester it will give you a better view of the state of the piston and rings, the bore, head gasket and valves. Images show a recently overhauled engine undergoing a leak down test and holding pressure - no piston blow by, gasket or valve leaks . Share this post Link to post Share on other sites
Wristpin 400 #8 Posted June 30, 2016 What's the history? Is it new to you and do you know what's been done to it? Has it ever run in your possession? If similar to the image it could be points ignition but more likely electronic - Magnetron. May be a Magnetron sticker in the centre of the debris screen above the flywheel. What's the compression like? Because of the action of the decompressor its difficult to check the compression by pulling the rope. Fold the handles, stand it on its tail, remove and ground the plug lead and then with a gloved hand bounce the blade against compression in the opposite way to normal rotation, ie clockwise when looking at the blade. Doing that fools the decompressor and gives a more accurate view of the state of play. You should get a pronounced bounce. If it's just soggy it's possibly time for a valve job. If you know anyone with a leak down tester it will give you a better view of the state of the piston and rings, the bore, head gasket and valves. Images show a recently overhauled engine undergoing a leak down test and holding pressure - no piston blow by, gasket or valve leaks . Share this post Link to post Share on other sites
