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Post by dstenersen on Aug 8, 2014 22:17:31 GMT -5
Hey Guys, Long time lurker first time poster here. So my girlfriend has been away on vacation for 9 weeks in Germany and comes home 1 week from today. She has always wanted a moped to travel back and forth from the university here in town. I found a great deal on a 2008 Lance Venice 150cc (3000 miles) that I couldn't pass up. Now she has no idea what she's coming home to and I want to make sure it goes perfect. When I bought it, it needed a new battery and couldn't stay alive while cold. I've been tinkering with the moped for a couple of weeks no, replacing old parts and general maintenance stuff. Here is a list of everything I've done so far: Oil Change (full synthetic) Gear Oil change New spark plug (from original) New Battery Replaced a few cracked hoses here and there Adjusted the valves (both .004) Cleaned the Carb Bought a new carb for the choke (choke fixed the cold start issue) Parts I have coming in on Tuesday: A 42mm Cone air filter New performance CDI New Spark Plug wire Here's the thing, I've been working on trying to get this thing to run as well as it can for when she gets back. I don't want her to run into any issues or know of any to begin with. Currently this scooter is topping out at 45 mph (via GPS). I've upped the jets to 35 pilot/112 main (started at 32 pilot/ 105 main) which resulted in absolutely no increase in speed except at take off. this also gives me a backfire after decelerating at WOT. I've also got these two wires going to nothing:  Any advice? Any general maintenance I've missed? |
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Post by alleyoop on Aug 8, 2014 22:41:31 GMT -5
Your doing good, the backfire is a LEAN condition and is sucking in air from someplace. Look at the Flange where it connects to the motor the gasket might be blown or the flange is loose. Also if it currently has an air box look for cracked tubing going to the carb or open connectors allowing extra air to be sucked in.
It should be do at least 50mph some depending on how you have it tuned will do little over 50mph. Does it have a tach built into the instrument panel, if so what are the RPMS at WOT. Depending on the RPMs at wot will tell if lighter or heavier gram weights will get the speed up.
As far as those two wires they could be for anything most harness's come with extra live and ground wires for options.
That green wire is ground, you may want to trace the red one and see where it is coming from that may help to tell where it might go IF something is not working on the scoot.
Alleyoop
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Post by dstenersen on Aug 8, 2014 22:56:49 GMT -5
Always good to hear  I'm not quite sure which flange you're reffering to. The backfire only happens with the larger 112 jet. It does currently have the air box and I'm currently researching what to do with the extra PAIR system line and 2 other hoses that are connected once I install the new cone filter. It does not have a tach built into the instrument panel so I don't know what the RPMs at WOT are. I've tried a few different tunes but nothing has increased that top speed. I assumed the two wires were simply extras, thank you for confirming! Thinking back, when I rev the engine while on the center stand the fuel filter barely fills up. Maybe I'm having vacuum issues. I forgot to mention, I believe this motor is considered a GY6-B. |
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Post by alleyoop on Aug 8, 2014 23:24:23 GMT -5
As far as the Pair system you can actually take it off now. You take the two bolts out that are right next to the valve cover then the two bolts holding the chrom pipe. Then you have to cover the hole where it was connected to the head right next to the valve cover, you can make your own plate and cover the hole and use the same bolts to hold the plate. Then the hose goes to a canister, there will be a VACUUM hose connected to it, PLUG the vaccum hose at it's ORIGIN. Then the hose hose goes to the air tubing pull that off the connecter and plug up the connector DONE. Now you can take all that stuff out. You can buy the PAIR PLATE or make your own:   This is the flange:  And here is where you can find what motor you have:  |
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Post by dstenersen on Aug 8, 2014 23:45:26 GMT -5
is the PAIR system removal necessary for the cone filter and stock airbox removal? the airbox has 3 extra hoses running to it.
I will have to check the flange in the morning after a night of cooling down. Planned on taking the exhaust off tomorrow and trying to clean some of the carbon deposits. According to my engine plate i have a BN157QMJ motor.
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Post by alleyoop on Aug 8, 2014 23:57:25 GMT -5
You do not have to take the Pair off if you don't want. That all it does is suck in fresh air into the exhaust side. You will find a hose from the canister just hanging that is where it gets it's fresh air. Now the air box you say has 3 hoses running to it, 1 is probably the EVAP(gas tank vent system) that will also go to a canister that needs Vacuum , another is probably a hose coming off the Valve Cover(that is a Vent hose for the crankcase), the 3rd hose may be from a EGR system which has a valve or a canister and also needs Vacuum. A EGR system has this on the exhaust pipe:  |
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Post by alleyoop on Aug 9, 2014 0:04:21 GMT -5
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Post by dstenersen on Aug 9, 2014 0:38:34 GMT -5
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Post by alleyoop on Aug 9, 2014 0:50:16 GMT -5
Cool, so your backfiring is most likely due to NO GASKET between the Flange and the Motor. You will most likely see black soot behind the flange.
THE LAST picture by the rear wheel is the TRANNY VENT HOSE, that you can zip tie it out of the way someplace just has to vent.
The FIRST picture is your Valve Cover Vent and just put a fuel filter on the end and zip tie it higher than the valve cover.
The Charcoal canister is your GAS TANK vent. You can do the same take the hose from the gas tank put a fuel filter on the end of it and zip tie it higher than where it is connected on the top of the gas tank and plug up the Vacuum hose at its ORIGIN and you will have a hose from that Charcoal canister going to the AIR BOX TUBING, pull hose off and plug up the connector on the tubing. With that you will be ready for the cone filter. And you can leave the PAIR system on if you want.
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Post by dstenersen on Aug 9, 2014 0:59:28 GMT -5
Is there anything else I can check in the mean time for the source of why this scooter is topping out at 45mph?
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Post by alleyoop on Aug 9, 2014 1:16:00 GMT -5
Yes, the variator weights and belt, you will need to take the Variator off and check out the weights they may have flat spots on them. Also you will need to weigh one so you know what gram weights it has in it. If you do not have a scale that weighs in grams take one to the post office and have them weigh 1 weight. That will tell us what gram weights are in there and 150s run pretty good with 11 and or 12 gram weights. Weights that are 13+ will lower the rpms to much and it will loose top end. That is why I always suggest get a tach they are very important when tuning a motor, cvt and carb. Its your fortune teller really it will tell you when the motor is purring and when things are going south all on the rpms. If you want you can get a really nice tach it is not expensive I have one even though I have a built in tach in my instrument panel. Alleyoop www.trailtech.net/catalogsearch/result/?q=hour+tachHere is mine: takes 5 minutes to install all you do is wrap the wire around the coil wire.  |
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Post by alleyoop on Aug 9, 2014 1:30:53 GMT -5
Here is your scoot:
Alleyoop
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Post by dstenersen on Aug 9, 2014 4:06:30 GMT -5
I'll have to take a look at those weights.
Thinking back, when I raised the main jet to 112 ( from 105) I never adjusted the needle. Is this something I should take into account? Besides the backfire there is no noticeable difference what so ever. Between 1/2 and WOT going back and forth in that section it doesn't feel like its acceleration faster. Just feels like it's still chugging along.
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Post by rockynv on Aug 9, 2014 5:30:19 GMT -5
I had the 2007 Vintage 150 and put the carb and air filter back to stock after tinkering with changing jets, etc and by just cleaning everything up, fixing the leaks, new fuel filter and putting in a Hoca variator with 12 gram weights was getting 60 mph easily. In 2007/2008 Lance had problems with the Znen engines due to delicate head castings and weak ignition pickups. Mine was DC fired so when the ignition started acting up I put the Orange DC CDI and matching High Output coil from Scrappy Dog in followed by the Ignition Pickup shortly afterwards (would leave me stranded when it got hot). Also the gasket between the intake elbow and head along with the elbow itself were prone to cracking causing ail leaks.
The vacuum fuel pump (gas tank was in the floorboards under your feet) would get impacted by ethanol so treating the fuel system with a heavy dosage of Berryman's helped get it pumping efficiently again and then using an ounce or two of Lucas fuel system treatment every other tank or so kept it that way.
The stock variator drive faces were a bit soft too so they were prone to grooving which would cause damaging vibrations. If you find any stress cracks on the muffler or have any buzzing under your feet you may have some grooving (mine started around 2,500 to 3,000 miles) and will need a new variator before any other collateral damages occur.
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Post by dstenersen on Aug 9, 2014 11:31:15 GMT -5
Went out to check out a couple of theories. Intake manifold seems to be starting to crack: (a little bigger than they appear in the picture) i1352.photobucket.com/albums/q651/dstenersen/photo1_zps55f4d3bd.jpgThe petcock was something I wanted to check out as well. I'll try to explain. I removed the petcock and their was still a little fluid in the top section. To test the vacuum diaphram I blew into the bottom hose which resulted in feul shooting out of the top section. After a few pumps in and out the diaphram felt different and more restrictive. I poured more fluid into the top section to continue testing and I can no longer produce the same result. I can no longer blow on the port and have air excape. Faulty petcock? i1352.photobucket.com/albums/q651/dstenersen/photo2_zps4b106f3f.jpgFurther more, On top of the exhaust gasket missing I also don't have a carborator intake manifold insolator. Any thoughts? |
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..BAD TO THE BONE..