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Post by lain on Dec 26, 2014 13:53:59 GMT -5
I have good news! It is running again! Here's what I did... After fully cleanign the carb and letting it sit overnight and makign sure it was nice and spotless while reassembling it, I reinstalled it into the scoot. I primed the carb by sucking ont he fuel vacuum hose for about 3 seconds, then I tried to start it up. No luck. Over and over and over and over and over, it would sort of sputter but never turn over and start... So then I was going insane trying over and over and over to start it expecting new results from the same action. Then I went in to use the bathroom, checked the mail and SWEET, dmartin95 sent me a CDI and it arrived, I popped that in and BAM it started right up! I put all the panels and everything back on and the cover over the fan to allow the fan to push air around the engine as I let it idle, and again it started right up again when I tried! I am noticing some backfiring occasionally like every minute or so it'll have a small backfire pop. This was also happening before it crapped out on me, and I want to get it figured out as well. Here is what I know about the engine's condition at this time; the exhaust valve is damaged, the piston rings are off by 0.002 each in gap measurement, one of the 2 exhaust studs are broken and therefor the muffler does not have a tight and closed connection at the exhaust port. Other than that the rest of the engine is actually still nice, no warping or buildup except with the exhaust valve. I have decided to order a new head and set of rings, I feel this would be the right move, as I don't want to tap the head anyways because I have done tapping a stripped hole wrong before and don't want to do it wrong on such an important piece of the scoot. |
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Post by lain on Dec 26, 2014 14:35:38 GMT -5
AND OF COURSE! Right when I thought I was out of the ballpark I think my electric starter crapped out on me now and I can't start again!
It feels like whenever the engine is about to turn over it kicks the electric starter back and then it spins around in its housing and pressing the button more just makes it keep spinning.
Do you guys think it is just the electric starter or is there something else causing this to happen? Maybe bad timing? I checked the cam and it shows up TDC when I have the flywheel on the T mark.
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Post by tvnacman on Dec 26, 2014 14:42:26 GMT -5
the sound in the video is you starter clutch/bendix not engaging . I see that problem with a weak battery , not a strong enough spin to push out and engage . It could be binding up , open up the cvt and check the bendix for free movement .
John
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Post by lain on Dec 26, 2014 14:52:47 GMT -5
the sound in the video is you starter clutch/bendix not engaging . I see that problem with a weak battery , not a strong enough spin to push out and engage . It could be binding up , open up the cvt and check the bendix for free movement . John My battery was fully charged, I got 2 good starts out of it then it started doing this. Then again, I did try a bunch of times before I switched the CDI. I checked the bendix, and it was caught between the disc and the starter like it got stuck and stopped, I twisted it and the starter turned with it and the bendix disengaged and popped back down, seemed like it was very hard to turn. I will pop the battery on the charger and try again soon. But if it wasn't engaging how would it pop out and get stuck? By the way I checked before that video too, and it was stuck between the disc and the starter like it was when I opened it after it kept making the clicking noise. Whenever it makes the clicking noise and I open the CVT it is stuck between the starter and the disc, and after turnign it it would still make the clicking noise and I would have to open it and turn it again, after a few more turns it finally starts turning the starter again, every time I open it after it makes the whirring noise it is not stuck. The whirring noise is brand new, never heard it before today on my scoot. |
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Post by tvnacman on Dec 26, 2014 18:08:19 GMT -5
are you getting the tip of the shaft in the hole of the cvt cover ? Did you check the spring on the bendix gear , is it working smoothly ? I think there is a bushing that sits in the hole the bendix sits could you have lost it this . John |
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Post by dmartin95 on Dec 26, 2014 18:49:27 GMT -5
I have good news! It is running again! checked the mail and SWEET, dmartin95 sent me a CDI and it arrived, I popped that in and BAM it started right up! I put all the panels and everything back on and the cover over the fan to allow the fan to push air around the engine as I let it idle, and again it started right up again when I tried! I am noticing some backfiring occasionally like every minute or so it'll have a small backfire pop. That's awesome the CDI worked for ya! As far as the backfiring, one thing you may want to check is your vacuum lines... Specifically the one coming from your carb.... The carb has a loop on the top of it to fish a hose through, that vacuum line, right at the carb has a tendency to break right at the connection to the carb. In most cases, you will not see a crack until you "bend" the line to expose it. I've had two scooters exhibit the behavior you describe and both was that stupid hose. |
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Post by lain on Dec 26, 2014 19:01:27 GMT -5
I have a pd19j carb, I don't see anything on top to put another line on, there is the bowl drain but that's it.
It looks like as soon as I got it running again the electric starter motor decided it won't work anymore. I took it out and it sounds like there's pieces inside rattling around. I have a new one on the way so hopefully I'll have this figured out soon as the parts come in.
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Post by geh3333 on Dec 26, 2014 19:05:04 GMT -5
Sounds like the starter clutch , mine does this " just not as bad " sometimes when the engine is cold and I first try to start it. After it warms up it starts no problem . recently after I found my vacuum leak my scoot now starts much easier. But It still sometimes happens. Not that a vacuum leak is the cause but it increases the possibility of it happening since my scoot wasn't starting right away.
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Post by geh3333 on Dec 26, 2014 19:06:40 GMT -5
I have a pd19j carb, I don't see anything on top to put another line on, there is the bowl drain but that's it. It looks like as soon as I got it running again the electric starter motor decided it won't work anymore. I took it out and it sounds like there's pieces inside rattling around. I have a new one on the way so hopefully I'll have this figured out soon as the parts come in. My starter just went bad and It also sounded as if there was something loose inside . luckily I had an extra. |
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Post by tvnacman on Dec 26, 2014 19:09:04 GMT -5
the 50cc carbs don't have do not have a loop to fish a hose through .
Did you get it with a new Bendix ?
Seems till you get the bugs worked out it happens to be one thing after another . Very rare that vacuum will cause back firing .
John
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Post by lain on Dec 26, 2014 19:20:56 GMT -5
the 50cc carbs don't have do not have a loop to fish a hose through . Did you get it with a new Bendix ? Seems till you get the bugs worked out it happens to be one thing after another . Very rare that vacuum will cause back firing . John The carb is what the scoot originally came with, its a CVK brand carb. I get a new bendix a couple months ago when my old one's teeth has came off in one spot. I have pretty much always had starter issues, though never this bad. For some reason I got 2 new electric starters a couple months ago and both of them broke because the teeth on the starter motor grinded down till there weren't any teeth. That's when I decided to put the old starter back in which had issues anyways, it would not turn a lot of the time, like it does now but also it seems to be rattling and whatnot. It looks like I will have to postpone working on it until either my new kickstarter gear arrives or the new electric starter. However I have a good feeling that once I have a new starter it will start right up again. |
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Post by geh3333 on Dec 26, 2014 19:28:23 GMT -5
Have u ever checked compression ?
I do want to take back one thing I said . since I found the vacuum leak and have a battery that is not weak , my scoot has not sounded as if the starter clutch was bad. It starts perfect even in cold weather. I just strted it and let it ran for awhile since I'll be taking it in the morn.
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Post by lain on Dec 26, 2014 19:38:14 GMT -5
Have u ever checked compression ? I do want to take back one thing I said . since I found the vacuum leak and have a battery that is not weak , my scoot has not sounded as if the starter clutch was bad. It starts perfect even in cold weather. I just strted it and let it ran for awhile since I'll be taking it in the morn. I think the compression might be higher than it should be, I mean it does feel like the starter was getting pushed back whenever it tried to reach the top of the compression stroke. I do not have a meter for compression or else I'd have checked that but I have a thick head gasket but maybe it isn't enough? What else could be done to lower compression? Also another thing that makes me feel like the compression is too high is when I go like half throttle or higher when trying to start it won't turn at all it just makes a creaking sound and the bendix usually gets stuck in between the starter and the disc when the creaking sound happens, well always actually. |
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Post by rcq92130 on Dec 26, 2014 19:40:19 GMT -5
wow. you are one popular guy (twenty SIX!)
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Post by rcq92130 on Dec 26, 2014 19:42:14 GMT -5
Most all auto parts stores have loaner compression gauges.
Still sounds like timing might be an issue; the spark going off at a time in the cycle that slaps AGAINST crank rotation. What camshaft are you using?
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