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crank !
by: geh3333 - Nov 28, 2014 17:10:33 GMT -5
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Post by geh3333 on Nov 28, 2014 17:10:33 GMT -5
Not to long ago I was hearing a noise coming from the right side of the engine behind the fan . I noticed a loose oil pump chain and replace it and also installed a new oil pump . the noise did subside however I am still occasionally hearing a noise from the same area. It mostly occurs after the engine heats up . for instance I just started the scoot and let it run for about 15 mins to keep the battery charged " I also have a story about the battery " . right before I shut the scoot down the scoot started making the noise. Its not that bad but it is noticeable. I've not noticed any performance change although this summer my temps have been running a little higher so i'm pretty certain its the crank. I did just recently have to replace my starter and the starter coil. My starter was making a weird buzzing/beep noise and the coil also sounded as if it was buzzing . however it would only occur in cold weather . after the scoot heated up and I started it again there would be no noise from either . I had an extra starter and starter coil which solved that problem . however back to the crank . I'm going to keep an eye on the noise and as long as it doesn't get worse I'm gonna hold off on replacing it untill it gets warm again .
Like I said I'm quite certain its the crank but like most Im trying to think of anything else it may be . i did just have starter issues , has anyone ever heard of a starter clutch going bad and making noise as the engine is running ? I know I'm reaching on this one ,lol .
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crank !
by: onewheeldrive - Nov 29, 2014 0:10:52 GMT -5
Post by onewheeldrive on Nov 29, 2014 0:10:52 GMT -5
Just be careful if it is the crank, because once I started hearing that sound, all gazillion of my cranks went out completely within 2 weeks of everyday riding-- leaving me stranded wherever I was. Only posting this because I read your post the other day about you riding your scoot to work.
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crank !
by: wilds - Nov 29, 2014 0:50:13 GMT -5
Post by wilds on Nov 29, 2014 0:50:13 GMT -5
yes, be careful if it's the crank. Here's what happened to my engine: Crank failure |
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crank !
by: geh3333 - Nov 29, 2014 1:05:26 GMT -5
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Post by geh3333 on Nov 29, 2014 1:05:26 GMT -5
From what I can tell if it is the crank its been bad for a couple months. I haven't noticed any side to side play . hopefully it will last a little longer . is it normal for the sound to come and go as the engine heats and cools with these cranks as they are going bad . I do have around 16,000 miles on it .
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crank !
by: onewheeldrive - Nov 29, 2014 4:13:28 GMT -5
Post by onewheeldrive on Nov 29, 2014 4:13:28 GMT -5
From my 5 or so experiences, the sound was always there from the very beginning until the soon to be end. I could always hear it at idle, cold or hot. It wasn't always as noticeable at higher speeds going down the road (either muffled or some sort of physics invovled), but the sound was always there at idle and very low speeds. It didn't matter if it was the rod bearing or the other 2 bearings on the crank--- I've had 2 main side bearings (left and right) and at least 3 rod bearings go out. It never went away and came back. These are just my experiences on my engine size/model.
The only other thing about the sound I can tell you is that it progressively got worse/louder day-by-day, or every other day, until it took a crap.
Maybe it's not your crank?
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crank !
by: geh3333 - Nov 29, 2014 7:13:03 GMT -5
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Post by geh3333 on Nov 29, 2014 7:13:03 GMT -5
From my 5 or so experiences, the sound was always there from the very beginning until the soon to be end. I could always hear it at idle, cold or hot. It wasn't always as noticeable at higher speeds going down the road (either muffled or some sort of physics invovled), but the sound was always there at idle and very low speeds. It didn't matter if it was the rod bearing or the other 2 bearings on the crank--- I've had 2 main side bearings (left and right) and at least 3 rod bearings go out. It never went away and came back. These are just my experiences on my engine size/model. The only other thing about the sound I can tell you is that it progressively got worse/louder day-by-day, or every other day, until it took a crap. Maybe it's not your crank? Is there any chance its the starter clutch ? I thought it was somewhat strange the sound is absent when the engine is cold . I'm gonna have to post a video of the sound at start up when it is not heard until it warms up . |
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crank !
by: xyshannen - Nov 29, 2014 8:07:32 GMT -5
Post by xyshannen on Nov 29, 2014 8:07:32 GMT -5
At 16K miles your engine is probably due foe a rebuild anyways.
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crank !
by: geh3333 - Nov 29, 2014 8:43:17 GMT -5
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Post by geh3333 on Nov 29, 2014 8:43:17 GMT -5
At 16K miles your engine is probably due foe a rebuild anyways. I'm surprised it lasted as long as it did . the crank was the only main component I left stock . I put about 16,000 miles on her in three seasons of summer riding . two of the seasons I rode the scoot very hard but this summer I took it much easier . Does anyone know if they make an ncy crank that isn't a stroker ? I'd like to buy a better crank then the cheap China crank , but I want a stock stroke. |
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crank !
by: tvnacman - Nov 29, 2014 9:39:00 GMT -5
Post by tvnacman on Nov 29, 2014 9:39:00 GMT -5
I have non stokers comming from China they are not branded NCY I will be checking them when they get here .
I wonder if your cdi could be stressing you starter clutch .
John
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Sophomore Rider
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crank !
by: david3336 - Nov 29, 2014 10:44:56 GMT -5
Post by david3336 on Nov 29, 2014 10:44:56 GMT -5
check to see if you have any play in flywheel they go bad sometimes and the center gets loose i have seen that alot. and that will make a knocking or tapping sound hope this helps
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crank !
by: xyshannen - Nov 29, 2014 11:51:31 GMT -5
Post by xyshannen on Nov 29, 2014 11:51:31 GMT -5
Would a small stroker, like this one be a bad thing? uniquegy6.ecrater.com/p/20208163/hoca-gy6-stroker-crank I mean no boring and more power. I don't see the down side. Changing your crank, even with a stock one, you still need a new set of rings and a new cylinder sleeve. Might as well get more POW wile your at it, |
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crank !
by: wilds - Nov 29, 2014 14:17:40 GMT -5
Post by wilds on Nov 29, 2014 14:17:40 GMT -5
Would a small stroker, like this one be a bad thing? uniquegy6.ecrater.com/p/20208163/hoca-gy6-stroker-crank I mean no boring and more power. I don't see the down side. Changing your crank, even with a stock one, you still need a new set of rings and a new cylinder sleeve. Might as well get more POW wile your at it, I do suspect you might have to shave a bit off the inside of the case to fit that crank. Maybe not this much but some anyway...  |
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crank !
by: xyshannen - Nov 29, 2014 17:56:49 GMT -5
Post by xyshannen on Nov 29, 2014 17:56:49 GMT -5
I think you are right, 2mm and under, no boring, If I remember right you can go up to a 4mm with no boring if you use a spacer,
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crank !
by: geh3333 - Nov 29, 2014 22:43:38 GMT -5
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Post by geh3333 on Nov 29, 2014 22:43:38 GMT -5
Would a small stroker, like this one be a bad thing? uniquegy6.ecrater.com/p/20208163/hoca-gy6-stroker-crank I mean no boring and more power. I don't see the down side. Changing your crank, even with a stock one, you still need a new set of rings and a new cylinder sleeve. Might as well get more POW wile your at it, I have a way to get around buying new rings etc. If you remove the nuts holding the head and cylinder on you can then turn the crank so that the piston is at the bottom of the cylinder then with the cylinder and head loose on the studs you can turn the crank so that instead of the piston rising in the cylinder it will force the cylinder and head up the studs exposing the bottom of the piston . in this position I should be able to detach the piston from the crank leaving the piston in position .as long as the piston doesn't get knocked out of place I can reverse the process attaching the piston to the new crank after I slide the cylinder and head back down the studs. This process if done right will ensure that the rings are in the same position with no need for any honing and new rings. |
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crank !
by: geh3333 - Nov 29, 2014 22:45:54 GMT -5
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Post by geh3333 on Nov 29, 2014 22:45:54 GMT -5
check to see if you have any play in flywheel they go bad sometimes and the center gets loose i have seen that alot. and that will make a knocking or tapping sound hope this helps I have absolutely no play in the flywheel . |
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