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Post by JR on Sept 9, 2015 21:22:39 GMT -6
If it fires good outside it'll fire when screwed in. You mentioned early about it was running ok one day and then just quit. I can think of several reasons for this, one would be anything in the ignition circuit that went wrong from bad coil to a broke wire but we know this is no the case now cause we have a good spark and new CDI, etc.
A broke timing chain would be another reason this is happening which we can easily fine out. Unscrew the top valve rocker are cover/plug out and simply turn the engine over and see if the rocker arm is moving the valve up and down. If so then the timing chain isn't broke. Timing chains can stretch and jump a tooth too.
Another thing other that electrical that can cause a sudden stop of the engine is a total plugged up carb due to bad gas and now the machine has set two years, diaphragm in the carb can go bad but you said the plug is wet?
Lastly one thing that can cause it to be out of time and to pop is the crankshaft woodruff key that the stator flywheel lines up with can shear and the stator flywheel move out of time.
At the time this happened it probably was something simple but now add two years of setting up and you've added to the problem.
JR
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Post by o0ohakko0o on Sept 9, 2015 21:37:01 GMT -6
Ok just went and bought the Ngk dr8ea the thread is much longer and this quad ain't gonna beat us lol
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Post by JR on Sept 9, 2015 21:45:06 GMT -6
Sorry I'm not buying that. I haven't found the correct listing in a manual yet but I will but when I google for a 110cc ATV engine sparkplug I come up every time and source NGK C7HSA. That's a common plug for 50 to 150cc engines. The DR8EA goes in my 250cc scooter, got one in my hand right now.
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Post by JR on Sept 9, 2015 21:46:46 GMT -6
Ok just went and bought the Ngk dr8ea the thread is much longer and this quad ain't gonna beat us lol I'm betting the NGK C7HSA is the OEM plug that came with the ATV, no reason for it to be wrong from the factory unless you know that it has been changed? Sparkplugs can go bad and not fire as well under compression. |
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Post by o0ohakko0o on Sept 9, 2015 21:57:31 GMT -6
Just bought the dr8ea and the thread won't fit it's bigger than the spark plug hole
Yes c7hsa came with the wiring harness I bought maybe if there is a longer thread for that type c7hsa ?
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Post by JR on Sept 9, 2015 22:04:30 GMT -6
Yes I just forgot about that myself the DR8EA will not fit at all. No the C7HSA is the correct plug end of story on that one. This is not the problem, I would look at some of the other suggestions.
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Post by o0ohakko0o on Sept 9, 2015 22:11:46 GMT -6
It definetly hasn't jumped a tooth and chain is not broken after watching a video on valve adjustments it all is lining up the T and the other part where the chain going around in the cylinder head I has a line pointing at 9:00 I between the two bolts if I make sense there lol I hope you understand what I am saying
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Post by JR on Sept 9, 2015 22:15:41 GMT -6
I understand perfectly so if you have the valves adjusted and checked the timing then I'm sure you know the rocker arms on the valves are moving properly so that's not the problem.
Ok here is a video explain how to get to the stator so you can check the woodruff key on the flywheel:
If that key has sheared and the flywheel moved one way or another then the timing is off. I'm still betting you need a carb? You can in the last pictures on this video see the woodruff key on the crank shaft. Also if you have a big jaw puller you can pull the flywheel instead of buying the tool they pictured.
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Post by o0ohakko0o on Sept 9, 2015 22:20:11 GMT -6
I will check out that video JR and will buy a new carb but can I just ask 1 question ok if I squirted gas in the spark plug hole put the spark plug back in etc and then tried to start it wouldn't it try to start or maybe backfire or some sign of trying to start. ?
With that video I don't have some of those special tools can I try with other tools lol
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Post by JR on Sept 9, 2015 22:27:43 GMT -6
I will check out that video JR and will buy a new carb but can I just ask 1 question ok if I squirted gas in the spark plug hole put the spark plug back in etc and then tried to start it wouldn't it try to start or maybe backfire or some sign of trying to start. ? You mentioned that with the muffler off it did indeed pop loudly or backfire? If the flywheel is indeed out of time then that would be a normal reaction. But if the flywheel is a-ok then the only other thing I can think of is a stuck valve that would cause this? That's easy enough to see? Pull both valve/rocker arm covers off and turn the engine over and check yourself. |
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Post by o0ohakko0o on Sept 9, 2015 22:40:44 GMT -6
nope there both fine JR those rocker arms and with that popping with the exhaust off it was not really loud just when I was turning it over it was making popping sounds
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Post by o0ohakko0o on Sept 10, 2015 0:18:19 GMT -6
Should I start dissembling the engine and look at Pistons ? I don't know what I'm doing but whatealse can I do obviously I'd have to buy gasket kit
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Post by JR on Sept 10, 2015 5:39:05 GMT -6
If it was me I would take a look at the flywheel key like I said and/or get a new carb first. Carbs are cheap and the flywheel inspection is free and needs no gasket. If neither of them is the problem then removing the head and checking the valves and piston rings would be next. If you have a non seating valve then that's the problem and lapping the valves is a easy thing to do to fix this. Lot's of times sitting a long time is the mortal enemy of carbs, last scooter I fixed after sitting for over a year I didn't even bother to try to clean the carb with a new one under $20 solving that problem with no hassel.
JR
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Post by o0ohakko0o on Sept 10, 2015 6:40:49 GMT -6
Hi there JR I had a go getting the flywheel off but no luck , I was able to stop the flywheel from turning but was unable to budge the three Allen key bolts inside the flywheel and also was unsure how to take the large centre nut off as well . I haven't really done this kinda stuff before apart from the basics but I guess I'll give it another shot tomorrow and I'll try and buy a carby in the morning misses not to happy with me lol have spent quiet a bit of money on this quad like tools and I bought 2 harnesses for it 4 new tyres and bits and peices but I'm determined to get it going for my kids I mentioned a new motor to her lol no chance
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Post by JR on Sept 10, 2015 9:14:29 GMT -6
The center nut can be a challenge as they are very tight. Do you happen to have a air impact wrench? You may have to be a little inventive on holding the flywheel to be able to put enough torque on the wrench to get it to let go? People have been known to make homemade things to hold the flywheel and keep it from turning. Also do you have a propane torch? One can get everything ready and put some heat on that nut and it will help the loctitie that they use on the threads to let go. Can you give me a picture as to what you are talking about on the 3 allen head bolts? One should be able to pull the flywheel by just removing the main center nut?
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