50cc Linhai aeolus Passportz - No Washer

[ScooterRookie]

Hello, just helped my nephew take apart his Linhai Aeolus Passportz 50.
If anyone else out there is wondering, there is no washer that restricts the speed on this scooter.  There is a long drive boss that goes over the crankshaft.  It can not be removed because the belt will then hit the threads of the crankshaft and piece with the rollers will not be stable because the crankshaft is not a big enough diameter.  
Not sure if all the terms are right, but that is what I found so far.   You have to take off the case and there is no oil or water there just air, but it still has a gasket so have some gasket maker nearby.  


I don't have any pictures yet, but I am going to take it apart to install an upgrade kit from Monster Scooter parts.  I will try to take some then.  

Also, it does not look like there is any restrictor screw on the throttle.  There is a tube in the Air Intake that makes the air coming in smaller, but I don't think removing this will affect the acceleration much.  I will let you know what I find.  I didn't remove it.

Anyone else have any experience with these scooters or the upgrade kit from Monster Scooter Parts?  I will keep you updated.  

[goosestale]

You want to download one of these manuals. The 50-150 or the GY6? Can't identify what engine by the scooter brand, but by the code engraved on the engine.
If this is the 50cc 4 stroke, then the GY6 is what you need. Not all have restrictors. That long drive boss is a normal part, a restrictor would be between the variator parts.
You don't need to replace that gasket for the CVT cover. It will be easier to work on in future without it, and no oil or liquid needs to be sealed in.

[ScooterRookie]

Thanks for the info.  I am going to look for these manuals.  I believe it was LH1 139QMB etched on the side of the engine.  

I updated the Cylinder head yesterday and put the bigger one on.  The kit had everything I needed, but I had a plastic wheel and a triangle that I was not sure what to do with.
  
I ran into a problem though.  The scooter now will not start.  I am not sure, but the timing chain fell off the crank sprocket when I took the head off.  I was able to get it back on, but it was not in the same place.  I turned the crank until the piston was at its highest position and then put the valves head and camshaft back on with the valves closed.  I listened to make sure the valves didn't hit the piston.  I think I am ok b/c the valves were closed when the piston was at its highest point.  I don't know if this is has anything to do with it.  Anyone have any ideas and any ideas on how to put this bac right? I found all sorts of things on the web that say use a spark plug and a screw, but it seems like a foreign language to me still.

Also, I did not put the new roller weights in yet, but I doubt that will have any bearing on starting up.  

Another issue that I doubt has anything to do with it, is the timing guide tensioner was really difficult to put back.  It kept popping out and there was no way to keep it from going down.  I dont think this is the cause because the chain still turns, but thought I'd throw it out there.

The motor was easy to take out, except there was one wire that went down to the fan/alternator on the otherside of the crank, opposite where the kickstand is located, from the gas tank.  This made it difficult because I could not move the engine from the bike.  I just pulled it out a little, lifted the back end up and turned it, but it was a pain to have to lay on the ground to work on it.    

[goosestale]

There is a ground wire that connects to the engine by the top fan cover screw.
 
The GY6 manual is what you are looking for. The 139QMB is the 50cc GY6 engine. The Arrow manual is for the 150cc GY6, you may want to downlod them all and see what's most useful for you. These are manuals for the engines, not just the basic user manual.

[ScooterRookie]

Ok.  So here is the latest update.  We put the head in wrong.  It was not lined properly.  Turns out there is a mark on the fan/magneto that has to be lined up with a mark on the case to put the piston at Top Dead Center (TDC).  Then the two small holes on the camshaft sprocket have to line up with the edge of the case and that is how you know that the valves and pistons are lined up properly.  Boom, we are able to get it started.  I was not there for this procedure, but my nephew just told me about it.  The new roller weights are also in.

However, now that it starts it won't idle.  Can anyone out there help me with this one?  What would cause the scooter not to idle?

Thanks for all the help!

[scooter 49]

Find your idle screw on the carburetor and turn it clockwise.

[ScooterRookie]

Thanks for the help again guys.  I went over and adjusted the idle screw and it stays on.  It won't start with the starter, but it starts easily with the kick-start.  Now, smoke is coming out the exhaust and from somewhere under the head.  We are getting there!

[fiveliter]

I have the same scooter.  I've had it for a little over a year now and this forum has been great with helping to fix little problems that have come up.  I had a problem with the electric starter too.  The problem was resolved when I changed the stator and flywheel.  Until I replaced those two parts, I had to use the kick start also.  Since I've had the scooter, I've added 5 grams roller weights, larger diameter variator, racing cdi, and 1500 rpm clutch spring kit.  Noticable acceration improvement.  Scooter does about 30-35 mph around town.  I can hit 40 on long straight roads.  I also had a problem with loud squeaky rear brakes.  Pulled the rear wheel and added a little powdered graphite to the shoes.  Squeak gone and rear brakes still working nicely.  On the intake box, do not remove the small black fitting inside, if you do, the scooter will run too lean and not run properly. I also had to fix the gas gauge float in the gas tank.  Easy fix, but these are the things that will pop up on the these scooters.  Ask if you have any questions.  Anything that I can't answer, Fox and Goosetale most surely will.  Enjoy!

[ScooterRookie]

Thanks fiveliter.  You get a faster acceleration and did not change the cc to 72?  Wow.  I probably spent money needlessly.  
I figured out the smoke was coming from the exhaust in the front because I had stripped the inside of the head where the exhaust bolt came from.  No more smoke in the front.  I also adjusted the valves and not sure if that had anything to do with it, but it did not seem to have any white smoke from the back now.  

However, I have an oil leak from messing up the gasket so I am going to fix this tonight.  Just got some gasket paper from AdvanceAuto Parts this morning.  

The other issue I have is I took the scooter for a test ride and it hesitates after 12 mph.  Air filter box is split really bad.  I was pulling it off the first time and didn't know there was another screw on the bottom and split it in two.  I taped it up, but if I leave the small fitting in, the engine will die and accelerate slow.  If I leave the hose in, the same thing.  If I take off the hose going to the front of the bike and use one finger to cover the intake opening, it accelerates great.  I was thinking of changing the air/fuel mixture, but not sure what damage I would do.  

Also, anyone know if there is a rev limiter on this scooter?  and How to take it off, if there is.  There was a small black box in the batter compartment that I just disconnected and it seemted to work a little, but with the hesitation, I want to make sure there was nothing else.

Also, do you know what size and mm the main jet in the stock carb is?

[fiveliter]

The acceleration increase on my scoot is very slight, but I have taken off my mods, test driven the scooter and put them back on and compared, and there is a difference.  Sounds to me like you need a new air box.  There are a bunch of online venders that sell them. Too much air will lean these motors out and then they will not run well.  I bought a few different size carb jets when I experimented with a high flow air filter.  I think the stock size jet is around #84.  Fox will have to help me with that one.

Not sure about the rev limiter.

[frostyman]

You may want to clean the carb just for extra measures after repairing the airbox. I had just a little crack in mine, and the next thing I know dirt(riding after the rain stopped) was in the intake tube and  the throat of the carb.

It seems like the CDI's are restricted more often outside the states? Do you have a pink wire on your CDI? I don't pay a whole lot of attention to derestricting, due to the fact my scoot seems to have no "major" restrictions. I'm guessing the pink wire, is the reason I only have 3 wires that go into the 4 prong connecting/mating piece on my CDI?

[ScooterRookie]

I did not know what a CDI was until you mentioned it.  I looked it up and I am going to have my nephew check it out and get back to you and post some pictures.  

The oil leak was fixed.  I stripped the threads of the exhaust and used Fix A Thread(Heli-coil knock off) to fix it.  It worked great, but the tool that came with it was cheap. It was made of plastic painted like metal and broke off in the threads when I tried to pull it out.  Thankfully the coil was fully in and I was able to drill threw the plastic.  Also, no more oil leaks after scraping off the old Gasket material and putting a new one between the cylinder head and engine block.  

I ordered a new airbox and it should be here tomorrow.  I'll let you know how that goes.  However, what I did was use duct tape and ties to hold the airbox together.  It still stalled at 10MPH, so I used a tie to put a crimp in the air hose and it worked fine.  I tried messing with the air fuel mixter, but it did nothing.  

I am going to try cleaning the carb after I get the new airbox and see what I find there. 

Otherwise, the oversized piston definitely seems to add more power.  Not sure if it is the piston or rollers that came with it.  It still reaches only upto about 20MPH on a slight hill, but about 40 on a slight downhill and about 30-35 on a straight road.  It accelerates much faster.  

[goosestale]

A lighter roller will ad a little power to take off and keep it in a higher gear for hills, but the rollers won't actually ad gains in top end speed.

[ScooterRookie]

Sorry guys, I couldn't post any pictures.  

[ScooterRookie]

Guys, scooter was running.  Lot more acceleration.  Went to start it this morning and it just died on me and would not start again.  Sometimes it turned over and then it just died.  Other times, it was running and then it would just die.  

Is it because I put a big bore kit and did not change the exhaust?  Or the carb? or the air box? or a combination?  
I am back to the drawing board.  

What if I just put in a pipe expander and opened the muffler up?


I am almost tempted to just put the old cylinder back on.