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Post by lain on Apr 22, 2015 11:27:05 GMT -5
did you rejet the carb when you went to a bbk? is this a new problem (with the carb). Is your throttle cable too tight? The other problem is blow by. I think the rings didn't seat correctly. No there's still slack on the throttle. It has always idled around 2k, in the winter at the same point where the screw is it would idle at about 1800. I am using #  jet with one of those foam filters as you can see in the beginning of the video on the previous page, along with the gurgling noise I hear from the valve oil vent hose. I do not have my friend over today and do not have a good camera of my own, but it makes the gurgling noise on what seems to be the exhaust stroke. I can hear the intake stroke pull air in from the carb (I had my fuel and spark turned off while doing this) and it builds up pressure like it should making it harder to turn by hand, then on the exhaust stroke as it gets easier to move by hand I can hear the gurgling from the valve oil vent hose. |
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Post by lain on Apr 22, 2015 11:12:56 GMT -5
I've had this oil issue with this engine ever since I first tried to install a BBK. I first thought it was a gasket issue, and at this point I have used 3 different heads for my 50mm BBK, 2 different sets of cylinders and pistons, and they all have had the same issue where I am somehow losing oil through my valve oil drain hose like all the time, and my oil keeps getting black and dirty fast and constantly needs changing or additional oil every couple weeks or so. I have been unable to figure that out for months but it has not effected performance, just has been costing me a lot to keep getting oil...
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Post by lain on Apr 22, 2015 10:54:37 GMT -5
This is a 4 stroke 139qmb with "100cc" BBK. I was talking about the idle speed screw, sorry forgot to specify.
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Post by lain on Apr 22, 2015 9:51:42 GMT -5
It rides smooth again, still smells like burning and I had someone tell me I was smoking every time I took off. The spark plug looks like mocha so I believe the mix is good. I can smell oil from the valve oil vent hose when running.
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Post by lain on Apr 22, 2015 8:55:22 GMT -5
Took everything off, it does not make any sounds except the gurgling noise from the oil vent hose from the valve cover. I am guessing the clanking was the variator. When I compared them side by side, variator A (the one that was in there during issues) has what looks like little pieces of metal to limit how far out the plate can go, while variator B (a spare I have) has nothing on the ends of the slide posts to limit how far out the plate can go. Other than that they look very similar. I decided to put the spare variator back in (variator B) with all 8g weights of the same set and the clanking went away. I also put in a new clutch (I suspect has 1k springs as it is stock 50cc clutch) while I was down in there. I am now going to go test it out on the road, but it seemed to idle fine.
For some reason I cannot get my carb to adjust under 2k though, once I get down to 2k the screw comes out and it still idles there at 2k without issues. I put the screw in just to where it started to have some resistance because I do not want it falling out on the road.
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Post by lain on Apr 22, 2015 6:34:39 GMT -5
Removing the variator and then spinning the crank is a good idea. There have been times " especially with the koso " my belt would sound almost like that. My belt was a good bit tighter with the koso , considering it was starting higher in the variator and further down in the clutch. But , def remove the variator and see if the noise is still there. From the video it sounds more like variator - belt noise. Yeah that's what I'm going to do today. I was just looking at my old variator and noticed the 2 sets of weights I am using (8.54g and 8.00g) are very slightly different in physical size. I am going to switch back to weights all from the same sets and see if I stop having wierd issues, as wel as check the crank with the variator and belt off. |
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Post by lain on Apr 22, 2015 6:32:23 GMT -5
The oil drain hose? Which one - the one from the engine valve cover, or the one from the gearbox? And by chance did you check to make sure the engine still has oil? The sound kind of seems like your oil pump scavenging for oil when there is none. The oil hose I am talking about comes from my valve cover and leads all the way back to where I was showing it in the video above the CVT. It was making gurgling noises like there was pressure pushing oil out of the hose on every turn and I could smell oil each time it gurgled. Bad valves? Maybe this is where all my oil keeps going? BTW I have a full pan of oil, dipstick shows oil at the top of the patterned part of the dipstick, I just added oil yesterday though. |
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Post by lain on Apr 21, 2015 18:08:44 GMT -5
The sound went away for the most part but is still there after it cooled down. I'm not sure exactly what it could be. I could reproduce it somewhat randomly while turning the crank by hand. Also, I noticed when I turn the crank the oil drain hose makes gurgling noises sometimes.
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Post by lain on Apr 21, 2015 16:21:06 GMT -5
I don't have an income right now, purchasing a new crankshaft alone will be a stretch for me.
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Post by lain on Apr 21, 2015 16:02:43 GMT -5
Usually with a bad crank you will be able to hear it all the time . I'd like to hear the noise If that's possible? I'll take video of it soon, just need to wait for my friend to arrive with the good phone that has the good camera so you will be able to hear it clearly |
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Post by lain on Apr 21, 2015 15:02:55 GMT -5
The front fairing is not a safe place to install an alarm, so I use the wire harness to wire it in the back hidden amidst the wires. The front fairing is the first thing thieves rip off your scoot to try to hotwire it, if the alarm is conveniently installed it is also conveniently removed.
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Post by lain on Apr 21, 2015 14:54:37 GMT -5
I was just cleaning out my CVT because some excess grease got on the belt and case from the clutch I just installed. While I was turning the variator I could feel and hear clanking noises. When I rotate it it clanks and I can feel vibration from what sounds like or feels like something hitting the crank or maybe something else? I can only feel and hear it from the variator side, not the flywheel side. I was thinking maybe the rollers, but it feels like it would have to be bigger than a roller by the vibration and sound. What dose it sound like when it runs. It sounds normal, like it usually sounds. I was just on my way home, on a 10 miles ride and near the end I heard something weird, like flopping sound and the power cut down, but not out. I imeediately noticed I can no longer reach 30 when going half throttle... I took the case off thinking it was the belt slipping or something, and it smells liek burning rubber, but the belt was just as fine as before I left... The scoot acts weird now, liek it sort of jerks when taking off, doesn't go as fast as it used to from a stop, but can still reach up to 50, though after the sound I was purposefully riding at 20 the rest of the way home (a mile from where I was). The ride feels smooth but slower, but the weird rubber burning sound, the clanking when I turn the crank by hand, and the jerking and slow performance is worrying me that I might need a new crank? I have no experience with cranks, don't know what to look for to diagnose the issue, or anything. |
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Post by lain on Apr 21, 2015 11:47:20 GMT -5
I was just cleaning out my CVT because some excess grease got on the belt and case from the clutch I just installed. While I was turning the variator I could feel and hear clanking noises. When I rotate it it clanks and I can feel vibration from what sounds like or feels like something hitting the crank or maybe something else? I can only feel and hear it from the variator side, not the flywheel side. I was thinking maybe the rollers, but it feels like it would have to be bigger than a roller by the vibration and sound.
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Post by lain on Apr 21, 2015 9:36:03 GMT -5
I am helping my friend install an alarm on his scoot. It is one of those motorcycle alarms that I wired to the scoot. Everything works except the remote start. I hooked up the blue wire to the red and yellow wire that goes to the solenoid, that is the correct wire to splice into right? Well, it will start regularly with the key, but will not start remotely at all does not even try to crank the engine, even with the killswitch on engine run and even with the key and ignition on, we tried every which way but it will not attempt to start remotely... I am stumped though, I was sure you were supposed to feed 12v into the solenoid where the 2 thin wires (green and yellow, and red and yellow) and it is supposed to make the engine turn by the solenoid feeding the starter motor power... but it is not with the remote start...
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Post by lain on Apr 20, 2015 13:17:21 GMT -5
Around here people sell working used scooters for around 200-300, usually in good shape. I person ally wouldn't pay more than $100 for a parts scooter, unless the engine was perfect and only the body pieces were bad, but with as many bad body pieces as you describe I wouldn't go higher than $100 even with a working perfectly good engine.
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jet with one of those foam filters as you can see in the beginning of the video on the previous page, along with the gurgling noise I hear from the valve oil vent hose. 
