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Post by pmatulew on Jul 16, 2013 18:41:48 GMT -5
Just do a search on youtube for "GY6 Top End"
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Post by pmatulew on Jul 16, 2013 18:31:30 GMT -5
I blasted mine with Aluminum Oxide abrasive because the chrome was so bad it was flaky and nasty. Took some effort but I was able to strip it right back to the aluminum casting. Then silver wheel paint from a spray can and then clear coat over top. Looks much better now.
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Post by pmatulew on Jul 15, 2013 20:49:14 GMT -5
A stiff kick starter is probably a good sign that you have good compression. That will definitely make the battery and starter motor work harder.
Recharging the battery depends on your charging system. If you ride it enough to re-charge what gets used during starting and running the lights, then maybe never. If the diodes in your regulator have gotten wierd and are allowing battery current to drain off while it's parked, then you'll have to charge it more often. Overwinter I keep mine on a BatteryTender type trickle charger.
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Post by pmatulew on Jul 15, 2013 20:36:19 GMT -5
The fact that you had a top end bearing failure is worrisome. It may have been a factory defect, but it may also be a symptom of oil starvation and overheating. We'll have rely on your judgement as to what sort of noise you're hearing, (any chance of an audio clip or walk around video?) If there's a chance that the noise is a mid frequency clunking rather than a higher pitch tapping, then maybe the oil problem turned in to a rod knocking.
Since your machine is offline anyway it might be worth your while to drop the motor out and pull the rest of the top end to find out what condition the rod and the piston and rings are in. You know, since you're already half way there...
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Post by pmatulew on Jul 15, 2013 16:28:43 GMT -5
The bearings on the cam should turn freely and silently, so whether or not that is the source of your current noise, you have at least averted another problem coming in the near future.
Having mist come back out the carburetor is not all that unusual and not necessarily an indication of a problem with the carburetor. Just that compressed air from the cylinder is burping out the wrong direction. The cams are already fairly aggresive on these small motors so if the timing is off a bit or one of the valves isn't sealing well or the crank kicks backwards it will do that.
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Post by pmatulew on Jul 15, 2013 6:59:18 GMT -5
Yup, batteries are a specialty science all by themselves. Even weak batteries will read 12 volts until you put a load on them and then they wimp out. Cold Cranking Amps is what count when you're trying to start a motor. There should be an auto parts store near you with a load tester that would be happy to test it for you for free. (Assuming you can get it there.)
You also need to make sure that all of your connections between the battery and the starter are clean and tight. The big red wire to the starter and also the big black wire that has to connect to a frame ground. Also there should be a medium black wire from the frame ground over to the motor ground point. All the power in the world is of no use if it can't get from "A" to "B".
Does the starter whir nicely when you hit the button or is it struggling?
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Post by pmatulew on Jul 15, 2013 6:43:45 GMT -5
A slide caliper is too big to get in there. What you really need is a set of feeler gauges. They don't cost much. If you can get a set that are pre-bent like this, so much the better.  Make sure you get a set that has the smaller ranges down to 0.002" or 0.003" The other option would be to use pieces of paper or plastic that you have pre-meaured separately with your calipers or micrometer so you know that they are the correct thickness that you want to set for. |
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Post by pmatulew on Jul 14, 2013 16:40:11 GMT -5
I concur. Windows Live Movie Maker will take you a long way. Simple to use. Works with most camera formats. With a little scrounging you can find and download the older versions of Windows Movie Maker that have a better timline function and allow you to drop in a separate audio track. By time you get to that point you'll already have an idea of what functions you're looking for and what other editing software is available.
Mobile videos are harder than they look. Vibration and sound quality are major issues.
There are videos posted that are longer than 10 minutes but I don't know what mystery criteria they use during the review process to determine who is allowed more time.
I've got some junk up on the 'tubes'. (look for Paul Matulewicz) So much to to learn yet compared to the pros.
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Post by pmatulew on Jul 13, 2013 21:30:15 GMT -5
10 minutes max. Five minutes better.
Chop chop chop.
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Post by pmatulew on Jul 11, 2013 17:07:04 GMT -5
You should be able to rev the motor and let off and decide whether the vibration follows the motor speed or whether it goes up and down slowly and follows the wheel speed.
i vote for the wheels being out of balance. i just had to add 2-1/4 ounces of weights to my rear wheel to get it even close to being in balance. i had to go out and buy more so I can do the front wheel.
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Post by pmatulew on Jul 10, 2013 5:12:21 GMT -5
On a related subject: Most fuel around here is listed to contain at least 10% ethanol. So it surprised me the other day to see a sign that stated that "Brand X" premium fuel did not contain any ethanol. Since alcohol has less energy per volume than gasoline I would think that adding or subtracting that 10% of the recipe would make a significant change in how the engine behaves.
Does anyone have a feel for other brands and grades that do or do not contain alcohol? And how your results varied?
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Post by pmatulew on Jul 9, 2013 19:32:45 GMT -5
If the actual combustion and expansion is to happen at the instant of greatest effect, don't you need to fire the spark before TDC so that the flame front has those precious microseconds to propagate before the magic moment?
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Post by pmatulew on Jul 9, 2013 19:22:33 GMT -5
Yup, rained everyday. I rode anyway. ;D
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Post by pmatulew on Jul 8, 2013 5:41:13 GMT -5
The pads on my wife's car fell out one time but that was just an adhesive failure between the pad and the backer. For the backer plates to fall out they would have to have been installed incorrectly.
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Post by pmatulew on Jul 8, 2013 5:34:29 GMT -5
Now that is interesting! I didn't realize that the 4-valve heads had Y-shaped rocker arms so they actuate off one cam lobe.
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