I have a 138cc Lifan powered Funrider. Which is a copy of a Z50 like a Pitbull. The 138cc engine is longer than the 50cc-110cc Lifan engines. It also has a hand clutch. This makes putting the stock exhaust impossible without changes. I had an MX exhaust on it but it was way LOUD didnt idle well and had a midrange surge. Then i said to myself what the heck ill try to make the stock work. Now i have eazier starting, idles great, better midrange, much less lean surge and its much, much quieter which makes for a better commuter.
To make the stock exhaust work:
1 Take heat guards off.
2 Take right swing arm shock and exhaust off.
3 Cut off exhaust tip (the very end of the exhaust that is between the right shock and the fender) off leaving only about a quarter inch stub. The remainder of the exhaust tip and difuser should fall out. If it doesnt take a grinder and grind the end until they become unwelded. You may need to use a flat ended puch an tap it a bit.
4 Using a rat tail file flile the ID of the end of the exhaust.
5 Make a eight inch long by one inch OD tube with a forty five degree bend at the end. (a tube without a forty five will work but the bend looks good, keeps the fender from sooting up and your licence plate from vibrating off. trust me.)
6 Slide the new exhaust tip into the muffler and tack it on. The internal muffler tube will keep the tip straight for welding.
7 Using your grinder grind off all pinch weld and the seam on the muffler above where the clutch arm on the engine is.
8 take a ball peen hammer and tap and carefully to make a concave area in the muffler directly above where the clutch arm would be. you might have to use the grinder (or file in a pinch) then hammer then grind, hammer, grind....fit..refit..fit.....
9 Once you have enough room for at least a quater inch gap for clutch arm, cable and weld clearance your almost there.
10 Weld it up. Bring it to a welding shop if you dont know how and ask them to TIG it if possible.
11 If you are fitting this pipe to a 138 you will also have to take the frame to muffler bracket off and use only one mounting stud on the muffler. Drill another hole in the mounting bracket for a more forward fitting. Youll see what i mean.
12 Get a can of heat resistant grill paint and touch it up.
You WILL be fitting the pipe on while you are doing all of this!
If you want me to do it all for you or a want a one inch OD tube with a forty-five degree bend....my email address is mojo.moto@yahoo.com
If you get any of the auto clutched engines there will be no need to make the clutch arm dent in the muffler. Im pretty sure all you would have to do up to at least a 110 possibly a 125 is to put the larger exhaust tip on.
The wireing is really simple on these engines. my funrider is Jencheng so four out of the seven wires were different color. But if you can read your wiring diagram from your owners manual its eazy to find which wires go where. Just take the covers off your engine and look with your own two eyes where they go. If i was to do it all over again id probably buy a auto clutch 125cc Lifan. AND dont get an engine with a piggyback starter. Make sure the starter is under the cylinder. If you get a piggyback starter the stock muffler WONT fit.
I also put on a regular shocked front end with a front hydraulic disk brake setup. 365 bucks! Yea. Expensive. It does ride beter in the front with less braking flex and the disk is a little better than the drum especially on long hard stops (less fading). Looks good too. goes good with the chrome honda fenders.
Next....Im getting street tires....a smaller rear sprocket.....a rectangle hond seat......a honda gas cap.....different rear tail light.......and a repaint.
Ive used this motorcycle for 80 percent of my driving this year. It has been quite reliable. With the gearing and knobby tires i can go places four wheelers can only dream of, then down the street legaly. I also have a stock lifan 70cc Z replica and it has alot more power than a 50cc engine. in fact i think the 50cc doesnt have enough power for the street. Really. On the street a person has to get on the boil sometime and a 50cc just wont cook.
Ill try to get a pic up if there is any intrest. if any body has any questions just ask. If you give these little buggers a lift they are alot of fun. Well off to visit friends on the other side of town. (on my 138 of course)
later.
