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Post by sgorman90 on Jul 26, 2015 23:08:41 GMT -5
Do you guys think that could account for the low cylinder pressure too? Or is it likely that I blew something haha
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Post by sgorman90 on Jul 27, 2015 14:31:04 GMT -5
Ok, so I just figured out why the pressure was low. One of the two 3.6 inch bolts holding the top end of the engine together snapped off. I was able to get it out, but now I need to figure out where to get a new one. I'll post a picture of the unbroken one.
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Post by sgorman90 on Jul 27, 2015 14:34:44 GMT -5
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Post by Fox on Jul 27, 2015 15:22:51 GMT -5
Check the cylinder and cylinder head for cracks in the area of those two bolts. The metal is very thin where the cam chain passes through there and now you know next time don't torque those ones so much. Here's a link to some OEM replacement bolts. www.partsforscooters.com/search-results?keywords=M6%20boltAny True Value hardware store, plastic bin section has metric bolts in various lengths. I believe those are M6 bolts. Meaning 6mm thread size. The heads do not have to be 8mm. a 10mm socket size 6mm bolt will work and so will an Allen head.
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Post by Availien on Jul 27, 2015 16:28:57 GMT -5
Where's the nut from the rocker arm?
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Post by sgorman90 on Jul 27, 2015 17:15:33 GMT -5
I haven't found it, it's somewhere in the oil deep in the engine
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Post by katastroff on Jul 27, 2015 17:46:05 GMT -5
I haven't found it, it's somewhere in the oil deep in the engine Someone will have to take one giant leap in scooter mecanics. You could try to get it out with a powerfull magnet by the drain hole, but your best bet would be to split the crankcase. No special tools needed if you're handy with a wrench, but its a PITA job.
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Post by derbiman on Jul 27, 2015 17:46:42 GMT -5
If you can't find a bolt at the local hardware store, see if there is a Fastenal store in the area.
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Post by sgorman90 on Jul 27, 2015 17:56:19 GMT -5
I actually ordered a replacement one, but if you guys think it's really worth digging out to avoid it tearing up my scooter I'll see if I can get it out with a magnet. Splitting the crank case sounds prettyyyy messy
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Post by Availien on Jul 27, 2015 18:27:48 GMT -5
Dude. You CERTAINLY need to get that nut out. There is no way I would run my bike with that thing floating around in there. You think you have problems now? Leave that nut in there and you really will have problems. I'm not saying for a fact that it will screw something up. But I can say your chances of something terrible happening to your crank-case components have increased by a LOT. It could get lodged in your oil pump, timing chain, etc... and really make a mess of things. Replacing a .50 cent bolt could turn into a considerable amount more in repairs if you leave it.
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Post by Fox on Jul 27, 2015 19:05:42 GMT -5
Here's what I would try before tearing the engine apart.
Go and get a gallon or two of diesel fuel. Drain the oil from the engine and reinstall the drain plug. Then remove the oil strainer and reinstall the strainer cap. Then remove the entire engine from the scooter if it's not removed already. remove the top end and piston. Then I would fill the engine crankcase with about 1 quart of diesel, pick up the engine, shake it gently a little bit and immediately dump the diesel out through a giant coffee filter into a clean container/tub by tilting the case so the crank faces down. All the diesel will come running out between the crank halves and the cam chain hole. Refill the case and the gas can with the gas in the tub and repeat about ten or twenty times. The coffee filter should look pretty glittery when you are done. You may even find what's left of that nut you lost in there. It may still be intact.
Then hang/place the engine in the dump position so all the diesel can run out. Remove the plugs to promote air flow through the case and you can use compressed air to help dry the deisel outta there. After a while reassemble and reinstall the engine. then run the engine with some cheap oil for the first 20-50 miles miles and then swap in some good stuff.
You can use the diesel to clean the engine after inside where the belt is. Makes good de-greaser with an old paint brush. remove the belt and pulleys first. You don't want any oil or gas on the belt or clutch.
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Post by spaz12 on Jul 27, 2015 19:43:29 GMT -5
While the motor is apart and hanging, like Fox said, I would also rotate the crank assembly and listen (and feel) very carefully for anything that doesn't sound right. You don't want to run the motor if the bearings were damaged.
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Post by derbiman on Jul 27, 2015 20:09:58 GMT -5
Maybe if you are lucky, it is in the oil filter screen!!!
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Post by Availien on Jul 27, 2015 20:24:17 GMT -5
Here's what I would try before tearing the engine apart. Go and get a gallon or two of diesel fuel. Drain the oil from the engine and reinstall the drain plug. Then remove the oil strainer and reinstall the strainer cap. Then remove the entire engine from the scooter if it's not removed already. remove the top end and piston. Then I would fill the engine crankcase with about 1 quart of diesel, pick up the engine, shake it gently a little bit and immediately dump the diesel out through a giant coffee filter into a clean container/tub by tilting the case so the crank faces down. All the diesel will come running out between the crank halves and the cam chain hole. Refill the case and the gas can with the gas in the tub and repeat about ten or twenty times. The coffee filter should look pretty glittery when you are done. You may even find what's left of that nut you lost in there. It may still be intact. Then hang/place the engine in the dump position so all the diesel can run out. Remove the plugs to promote air flow through the case and you can use compressed air to help dry the deisel outta there. After a while reassemble and reinstall the engine. then run the engine with some cheap oil for the first 20-50 miles miles and then swap in some good stuff. You can use the diesel to clean the engine after inside where the belt is. Makes good de-greaser with an old paint brush. remove the belt and pulleys first. You don't want any oil or gas on the belt or clutch. This definitely sounds like a good place to start. If that doesn't work, tearing it apart isn't too bad. You might as well get a stroker crank shaft to install while you got it apart!!
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Post by sgorman90 on Jul 27, 2015 20:32:35 GMT -5
Thanks for the advice guys! I'll certainly give Fox's idea a try and see if I can find that nut
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