87 Warrior won't start on button but will push start - Yamaha ATV Forum
 
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post #1 of 11 Old 02-02-2012, 03:56 AM Thread Starter
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87 Warrior won't start on button but will push start

My 87 Yamaha Warrior originally thought it wouldn't run at all, after a few tests and a push test it runs, and it runs just great. However I can't get it to start by using the push button, only by push/pull starting it? Anyone have any idea what it could be? I can post a vid if it helps anyone. One way clutch (starter clutch) or something else?
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post #2 of 11 Old 02-02-2012, 07:55 AM
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Originally Posted by 95camaro95 View Post
My 87 Yamaha Warrior originally thought it wouldn't run at all, after a few tests and a push test it runs, and it runs just great. However I can't get it to start by using the push button, only by push/pull starting it? Anyone have any idea what it could be? I can post a vid if it helps anyone. One way clutch (starter clutch) or something else?
Does it to ANYTHING when you hit the starter button?
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post #3 of 11 Old 02-02-2012, 12:30 PM Thread Starter
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Yes, starter is working spinning trying to start it.
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post #4 of 11 Old 02-02-2012, 08:19 PM
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One way bearing behind the flywheel. You'll need the replace the gear as well that the bearing locks onto. If I remember right the last one I fixed was around $500 parts and labor. I tried to talk the customer out of fixing it because the unit was rough. And now it's sitting in my warehouse about a year later...with $300 worth of new parts in it.
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post #5 of 11 Old 02-03-2012, 03:18 AM Thread Starter
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Not starter clutch, thats what your talking about. Crankshaft spins, piston moves, already ruled that one out.
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post #6 of 11 Old 02-03-2012, 08:20 AM
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Most likely low compression then. I thought you meant the starter was turning but the engine was not. How is your air filter? Check your intake valve clearance. If it runs good once you pull it off, meaning it doesn't smoke, you probably have tight intake valves. Take the tappet cover off, turn the engine through until the intake valve opens and closes, the next time the piston is at TDC you should have .003 valve clearance +/- .001. If you don't have clearance the valve is held open and the fuel/compression is blown back out of the carb disrupting everything that needs to happen for the engine to run. When you pull it off the engine turns fast enough to overcome this, then once the engine is hot the valve head expands enough to create a small amount of clearance. hope this helps you.
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post #7 of 11 Old 02-03-2012, 03:36 PM Thread Starter
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Air filter is decent, smell a bit of fuel on it but not huge amount but is clean. No it does not smoke.l Thanks for the info! Now thats an arguable point. I'll regap valves tonight and let you know how it goes. Maybe I goofed last time I gapped them. My guide says .06 - .10 for intake valve clearance though. It still does it when the engine is warm but still a good possibility. Now what if the valve has clearance, whats your next best bet?
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post #8 of 11 Old 02-04-2012, 09:06 AM
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You could have an issue with voltage in the ignition system. I've seen situations where the electrical system will supply enough voltage to either spin the motor or produce a spark but not both at the same time. I would use a spark tester or a timing light if you have one and make sure the unit is firing when you're turning it over with the starter. Your settings are correct on the valve clearance. I quoted standard numbers, your numbers are metric, same clearance. Let me know what you find.
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post #9 of 11 Old 02-08-2012, 12:43 AM Thread Starter
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Decided to check intake valve clearance, my friends brother suggested it too. Turns out the valve was fully tightened. Durr moment. Haven't been able to try it yet as to when I tried to start the starter shelled out. But its definitely looking like it would be fixed now. I'll update when the new starter comes in.
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post #10 of 11 Old 02-08-2012, 08:18 AM
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That's good news! I don't know if you have a service manual or not but in case you don't a good trick is to remove the tappet cover, turn the motor the direction it normally turns with a socket on the crankshaft (if you turn it the wrong way you'll hear the one way bearing turning the starter), watch the intake valve until it goes down (opens) and then back up. Now turn the crank until the piston comes to TDC. this will be TDC on the compression stroke and this is where you have to have it to set valve clearance.
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post #11 of 11 Old 10-24-2012, 12:07 PM
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Is that an expensive fix? I have the same issue I can't get it to start by using the push button, only by push/pull starting it
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