400ex will turn over but not start - Honda TRX Forum
 
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post #1 of 8 Old 04-20-2019, 09:53 PM Thread Starter
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400ex will turn over but not start

ok so today i just went and changed the starter clutch and the starter gear and put everything back together and went to start it and it wont fire. the engine turns over just fine. i checked the spark plug and its fine its getting fuel to the carb i tried spraying starter fluid in the carb still wont start. and the weird thing is it was running fine about two weeks ago. also tried to roll start it but still wont start. the way it sounds is as if the kill switch is turned off but i can promise you its turned on.
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post #2 of 8 Old 04-23-2019, 01:02 PM
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Do you have spark? My first guess would be the flywheel was not sufficiently torqued and the flywheel key sheared throwing the timing off. The key is not for holding the flywheel, it is to align the flywheel so the spark timing is correct. Once aligned, the flywheel is tightened onto the taper of the crankshaft. It's the taper that locks the flywheel to the crankshaft.
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post #3 of 8 Old 04-23-2019, 04:09 PM Thread Starter
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ok yeah i have a really good spark and could someone give proper instructions for putting the flywheel back on i did not no there was a special way to do it
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post #4 of 8 Old 04-23-2019, 04:46 PM
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Not a 'special' way to install, just the correct way

Install the starter gear wheel, put the woodruff key in the crankshaft, align the flywheel with the key and push it on while turning the gearwheel clockwise, once the gearwheel has engaged the one way clutch, it will freewheel in the clockwise direction and lock when turning counter clockwise - use an impact driver to tighten the nut to about the tightness of a wheel lug nut (make sure there is no grease or oil on the crankshaft or inside the flywheel taper) - now it should be in time and tight enough not to slip
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post #5 of 8 Old 04-23-2019, 05:25 PM Thread Starter
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so the flywheel has the woodruff key and the shaft has a slot or vice versa?
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post #6 of 8 Old 04-23-2019, 05:44 PM Thread Starter
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so are you saying the woodruff key might be sheared off?
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post #7 of 8 Old 04-23-2019, 06:17 PM
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The crankshaft has a 1/2 or 1/4 moon recess the key sits into and the flywheel has a slot that slips over the key
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post #8 of 8 Old 04-23-2019, 07:12 PM Thread Starter
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ok it makes sense now because when i put the flywheel back on slipped on the shaft fine so im pretty sure its sheared off. im pretty new to all this so i did not know about the woodruff key. i should probably done more research about all of this. and thank you for all your help
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