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Ask Donald Your Own Question
Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1800
Experience:  I have 25+ years of experience repairing 2 & 4 cycle engines
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It's got new connecting rods, one new piston, cylinder head

Customer Question

It's got new connecting rods, one new piston, cylinder head #1 is new, and it won't run right. Spitting through the carb. 120 lbs compression on both cylinders, what gives?
Submitted: 1 year ago.
Category: Small Engine
Expert:  Donald replied 1 year ago.
Hello and thank you for choosing Just Answer. My name is ***** ***** I will do my very best to get you the answer you need to your question.
What settings did you use for your valves? Have you double checked your flywheel key?
Customer: replied 1 year ago.
5 thouusanths on valves and the flywheel key looks good
Customer: replied 1 year ago.
I opened up the clearance on the valves just to be sure they werent open but no change. Exhaust pumping into intake, and #1 not firing
Expert:  Donald replied 1 year ago.
.005" should be just fine. Let's try something. Start your engine and carefully remove one spark plug wire at a time. If you leave your spark plug wires a little loose, you can use a screwdriver to safely remove them, while your engine is running. This procedure will determine which of your two cylinders are at fault. With your engine running, start by removing the spark plug wire from cylinder #1. If your engine continues to run with this wire off, then cylinder #2 is likely okay. Repeat this procedure on cylinder #2. If you remove your spark plug wire from cylinder #2, and your engine shuts off, then cylinder #1 is likely at fault. Check for spark, on both cylinders. Are your spark plugs new? We can continue from here. Thanks.
Customer: replied 1 year ago.
Number 1 not runnng its got spark maybe i need to double check the fkywheel key
Expert:  Donald replied 1 year ago.
Thank you for checking. Spray some carburetor cleaner directly into your carburetor, as you are removing the spark plug wire from cylinder #2. Let's see if #1 will run on the carburetor cleaner. Make sure your intake gasket is okay on #1. Your carburetor may need to be rebuilt.