Monday, February 6, 2012 5:17:55 AM
Sheng Wey PD16
OK, so, I had the fun and joy of rebuilding the carb. The first thing that was wrong was the accelerator pump lever was not even on the shaft for the accelerator pump. The shaft was actually bent sideways, I bent it back to the correct position (left photo). And tested it, it works well. Then I cleaned out the main jet, the primary jet, these were actually clean, the fuel bowl had a little bit or residue from an additive the gas companies put into the fuel here. i cleaned that out as best I could and proceeded reassembling the carb. Remounted it on the intake manifold (which, by the way is made from rubber). After that I started the engine it had raced up to 6000 rpm. i then shut it off. Made some additional adjustments to the air/fuel mixture, seated it then opened it 3/4 of a turn. adjusted the curb idle speed to out 1 full turn. Readjusted all the cabling down to minimum settings, I managed to drop the rpm down to 3000. But after that there are no more adjustments. I then pushed on the carb just slightly and noticed that it actually dropped another 1500 rpm. So, to adjusted the carb there is a small hole on the bracket of the accelerator pump / throttle assembly. I ran a tie down to another larger tie down which I attached to the bike frame (right photo). Now the system makes a proper seal and the carb runs at 1500 rpm. So in conclusion I have a small vacuum leak in the intake manifold or the carb is not sealing properly and this is cause the increase in rpm's. An slightly bigger oil ring should fix that problem. Also have to see if I can get a metal intake manifold instead of the rubber I have. Tomorrow I test the bike to see how well I rebuilt the carb (Sheng Wey PD16 with accelerator pump).
Saturday, February 4, 2012 1:00:14 AM
Well the carb is really driving me insane. It really needs an overhaul, at 1/2 way to 3/4 throttle, it starts to bog badly. I lose power and the poor bike is coughing and sputtering down the road.The main jet in the carb must have paper or cloth in there. So Saturday afternoon I am going to rip it apart, and rebuild it. It really needs this badly. Hopefully it is just the main jet and nothing more. Will have to photograph the progress. It also needs to be leaned out more too.
Saturday, January 21, 2012 3:53:17 PM
Last weekend i modified the exhaust system on my motorcycle, the end results were actually much better than I expected. The chrome finish they put on the exhaust pipes, really does suck. Within 6 months, here they started to rust again. So, I ended up straying them with high heat silver paint,
which does look much better, for the time being, until it does it again. Well, back to what happened, I notice the exhaust looked a little different than it did before. Then it hit me that the end piece was gone, I found it on the inside of the muffler, it must have broke and fallen inside. So, I pried it out of the small opening and did the same with the other side and the end result was a lower deeper rumble than previous. The mufflers are set up as small chambers to muffle the sound. But if you remove a chamber then the sound just improves. Here where i live, the louder you are, the better you are seen. The majority of the drivers do not care if you are on a motorcycle. They just look at you as another object they can run over or run you off the road, "like you don't deserve to be on the road with them".
The way I see it is since my insurance is 6 times higher than a car, I have more rights then you, 6 times more rights. Now I just have to fix a problem with my carb, I am pretty sure there is dirt in the system, I tired to adjust the air/fuel mixture, curb idle speed, but the problem still remains, once the system warms up a bit the carb starts bogging out at full throttle, I don't get this when the carb is cold only happens when it gets warm to hot, so there must be dirt within the carb that is blocking the jets. Also the carb I have on this bike has an additional accelerator pump on it. So, it is like a double pumper.Will have to see if there is anything that is causing the problem.
Monday, November 14, 2011 1:13:52 AM
I finally replaced the air filter with the chrome replacement. I was trying to get the same filter at the local bike shop but every time I went there to get a filter, they always told me they didn't have one. I had bought a chrome replacement a year and a half ago. I kept putting it off. I was getting to the point where it really needed to be changed so i finally installed it. Getting out the old stock version was a real challenge, really makes me wonder how they got in the first time. I thought I was going to have to dismantle the bike to get it out. Needless to say after 25 minutes of turning and twisting it, it finally came out with a little struggle. Putting in the new one wasn't as easy as I thought either. Getting the rubber end over the end of the carb, was a little tough. It was a matter of lifting the rubber over the end with a screw driver, then wiggling back and forth until it mounted right. Then attaching the clamp and tightening it down.
Now it started really good after mounting it. But there always is a problem. The motor runs great with the new filter, but when you give it full throttle it now seems to choke. From everything I read about, they state that the air fuel mixture should be adjusted. This I am still trying to fine tune.
Oh, the other thing you have to do, when you take out the stock filter, is to make a type of bracket to hold the battery in with. I made mine out of chunk of bungee cord. Actually works very well. You cut a piece of cord about a foot in length, then you attach one side to the frame and mount it with a pipe cramp and a tie down. Wrap it to the back side of the battery then wrap around back to the frame, there you also use a clamp and another tie down. So it should look like this sideways c.
Monday, October 10, 2011 10:01:16 PM
Well the original chain, finally wore out on me. Man, did it ever get loose. Needless to say now that the new one is on, it is much better. The new chain was made in Japan, which is better than a Chinese made chain. Just overall better quality. The old use to jump so bad that, I thought one day it was going to break in half. So, I add the new on, had to actually push the wheel back about 25 mm because of the stretching effect from the old one. After that it ran better - no noise, no play in the links, the brakes worked better - less strain on the system. The whole rear end just works better.
Monday, July 25, 2011 6:07:15 PM
Well my bike turned 4 years old about a month ago. I would look good, but the rust has eaten most of the chrome, this is the biggest problem that I have seen with my Lifan bike. Need stainless stekll on the bike than the cheap chrome they have on the parts now. The motor has 9600Kms on it and it still goes strong. I do have a strange problem with the low beam (headlight)keeps blowing for some strange reason. Will have to replace it again, this one is a halogen too. I´ve had more holes in my tires than you could shake a stick at, the roads here in Lima you get everything, better off having self healing tires. Preventive anti rust is on the bike, but how long will this last?
Sunday, April 24, 2011 4:32:26 PM
Well, a while ago I installed a new clutch cable which cost me S/7.00. This included the housing and the rubber thumb protector, this is a deal since I bought cheap replacement cables for like S/3.00 which fray when you try to install one. Might as well to buy one of these instead. Also changed both the front pads and the rear shoes, the front pads took, maybe 15 minutes compared to the the rear shoes of 30 minutes. The brakes work really good now, they lasted about 3 years in city driving. The odd trip on the highway. The back brakes were not low they were just glazed, but they is a way of getting rid of the glazing so the brakes are usable again. So these are my spare brakes. Just have to do an oil change again, 1000kms sure comes quick.
Wednesday, January 26, 2011 1:18:06 AM
Well I finally painted the light bar, the chain guard, a gloss black which looks really good. I changed the oil, and used only synthetic which the motorcycle seems to like better than the regular oil I changed the headlight and added a halogen which makes all the difference in the world. Much better, than the old style bulbs, and didn't have to change any housing at all.
As for the old pipes I did finally cut them back so now just straight pipes, now just have to get some extra length on them and have them welded. Now I have to clean and strip the chrome from the old pipes and spray them with some high heat flat black paint. Still have to get the custom hanging mounts for the straight pipes.
So the project is coming but it takes time and me searching for the right stuff. 
Friday, October 22, 2010 5:34:04 PM
Rule of thumb, when buying new parts, get the ones that are suppose to be for your bike. I bought new brakes from the dealer a few days ago. As you can tell, you sometimes end up with not what you asked for. From the picture below.
Now buying these probably anywhere you probably ended with the correct part, but with is from a third party company, was given the correct model and was still given the wrong parts.
Friday, October 22, 2010 5:15:15 PM
The exhaust pipes I bought the same day I bought the brakes, since I am going to be in the annual biker parade, the exhaust pipes had to be mounted ahead of time. Which is what I did, Now the funny thing is the new pipes are slightly smaller than the original pipes. So now I get a slightly beefer sound coming from my exhaust system. The original pipes are being modified to be just straight pipe without baffles or mufflers. 
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