Recent Posts  By   (Read times)

I use this BBK and it runs strong shop.jupiterscooters.net/Cylinder-kit-75cc-Minarelli-10mm-wrist-pin-Made-in-Taiwan-MGMP0108-75CC-10mmpin.htm

Make sure to double check the wristpin clips as I and another member had one come out and it ate up the engine . I put in one with the piston in my hand since limited clearance , as I removed the body and fan shrouds instead of dropping the entire engine assembly .

Mesure your wristpins as they come in 10mm an 12mm but you may have a 10mm as I do .

Wiseco is a high end company that machines parts out of billet instead of casting , which means it is stronger and they forged it once on some and twice on higher priced pistons . I used a WiseCo in my Honda CR125 and it ran like a beast with it being not only forged , but lighter , larger ports ( racing model ) and had a shorter skirt .

It took me 40 mins to remove the pipe , main body as a single piece , fan shroud and the engine is so easy with only for nuts to remove and with angled sanp ring pliers the wristpins . I went to Oreillys and bought a compression ring plier as when I first rebuild a moped 30 years ago I broke the rings when I tried to install by hand . Make sure to use plenty of 2T oil or engine assembly grease instead of installing dry . Once you get the second ring started into the cylinder you may need a rubber mallet to tap it on down as I did . I put one the exhaust and did a test fire , let it idle and gave it a lil rev up and shut it down and retorqued the head nuts before putting the shroud and body back on

The jets for a 2T are not the same size as a 4T so they will not fit . Many use Mikuni VM11/22 main jets . Measure your jets with a caliper and you may want to get the jet kit for tuning it www.partsforscooters.com/114-50-Minarelli-Main-Jet-Kit?sc=34&category=133078 With an airfilter or an exhaust mod both will require a larger main jet . There is no set formula on what size to use as it has variables like altitude and climate so what works for one may not another . I had a 68MJ and went with a 75MJ in my 2T 50cc scoot . I later put on a small UNi ( not the big red airfilter but a vent cover ) and used a 90MJ and it ran great . With airbox and stock exhaust it may sputter as it may deliver more fuel than it can use . When I put on a BBK and racing pipe I had to test a few MJs in order to get it running right as at first I tried too large and it would spit gas out of the Uni

With an exhaust and or airfilter upgrade , like a Uni both require upjetting . Now you can run straight pipe providing its long enough and your jetting is right like many Harley riders do , but may get a ticket for it being too loud .

A buddy who drinks too much broke of his muffler in a mishap . I warned him about it being too lean and even gave him a Gy6 jey kit I had bought and offered to help him change out the main jet for a larger one . Well did not take my advice and even broke off the pipe at the head . It ran too lean , got hot and the exhaust valve head broke off and ate up his engine . His engine is in the picture and had to buy a new cylinder and piston kit .

Jets are far cheaper than a new engine !

I carry enough tools to do almost any roadside repair . Many have battery powered impact wrench . It is a VERY good idea to have plenty of tools including a flash light

My dealer told me many are need the valves adjusted out of the crate . Very important that you should have changed the shipping oil and gear lube before you rode it . Even if you have you should change it now as when new the rings grind down in the cylinder and the oil will have ring dust in it . The amount of dust varies according to how you do a break in . Use any brand name 10w40 engine oil , regular not synthetic yet , and use GL5 which is 80w90 gear lube for the gears . Belt should be fine even if a generic and for belts only use a Gates or Bando brand of belt .

Now if you got it online or from a local shop who sells them as they come without tweaking it as my dealer does , then yes you will want to make some improvements . I had a TaoTao ATMa that was a " secret 63 " and it would outrun many stock 50s . A buddy just bought a TaoTao from another dealer who only uncrates and puts on the mirrors and I can outrun him on my mountain bike . I rode it and darn it was so sloooooow . 50s have EPA restrictions like too small of a main jet in the carb and some have a restrictor washer in the variator which limits the speed . Here is a great page for derestricting tips www.scootnfast.com/scooter/Tuning_mods/De-Restricting.htm

Now if you do not have the restrictor washer what you should do is remove the variator weights which are roller types ( slider weights are after market item and much better choice ) weigh on a digital scale and get lighter rollers or even better Dr Pulley sliders . Lighter weights will improve take off and up hill but too light will hurt top end and MPG . I had 8 grams and got some 5 grams and it was amazing the improvement on take off and uphill and had the same top end but with more RPMs . You may want to get this weight tuning kit with various weights as you can mix 2 diff weights like 3 4g and 3 5g to equal 4.5g . These weights are for tuning and not meant for long term use . Once you find an amount that works get 1 gram heavier in Dr Pulley or Koso sliders . Here is some tuning tips www.provoscooter.com/tuning

Now a 50cc is only 3 cubic inches so a small engine will never perform like a car or motorcycle . To get more power you need to get a BBK which is a larger piston and cylinder kit , which will require at least a larger main jet or even better a 20mm carb that you can adjust the air/fuel screw ( stock carbs are often sealed ) , some have the carb bowl riveted on instead of screws and you have to remove the bowl in order to access the idle and main jet in order to install larger ones and many stock carbs have no needle clip to adjust its position . Since it is new I would ride it as after 700 or more miles the piston will not be as tight as when new and move easier , just like new shoes can be tight but once broken in they get comfy . For a BBK hands down the best kit is the Air Sal 50mm BBK which I put in mine and I am shocked that it can be bought for 49 dollars as it is 100 more other places . This kit uses the stock head so there less parts to buy but you should use an extra base gasket as compression will be higher than the 40mm or 50cc piston . The Air Sal in made in Spain rather than China , is machined and has ceramic coating to prevent heat damage . I cracked a 63 piston and another exploded so no way did I want another . When the 2nd piston exploded I did research and joined the old scooter place , learned I was not the only one with issues and was suggested the Air Sal kit too . I was used to Honda and European moped , scooter and motorcycles and that was my first China scoot and I learned real fast they are far from being as good as a Honda . Here it is but they said out of stock as it was on sale and many here have gotten one www.spi-parts.com/gy6-airsal-81cc-big-bore-cylinder-kit-02350150.html

Scrappydog scooters is another great place to get parts , power kits or even an 80cc crate engine as well www.scrappydogscooters.com/139QMB_50cc_Performance.html


Sometimes a stiffer contra ( also called torque ) spring can help up hill

You have gotten mote miles out of yours than many do on the 50s . Get a new Gates or Bando belt ASAP and keep the old as a spare . Belts usally have wear signs like teeth missing and fraid cords as well as thinner too . It is best to change it BEFORE is breaks as you could wreck with the rear wheel locked up , no fun to push it home , and a belt broken while riding can and has damaged the pulleys . I changed the belt on my 2T at 4,400 miles even though it still looks great and could get 2,000 more miles perhaps . Kevlar belts are stiffer , have vibration and known to damage parts when they break . So I would get a nonKevlar belt . I got one and it is no where as smooth as my stock Gates belt was . I bought a Bando 788 17 28 which many longcase 2Ts use .

My Echarm I got 12,000 miles out of it and could have gotten 1,000 more but it is not worth the risk and hassle of having to change it on the roadside instead at home

Interesting a 2T exhaust on a GY6 50 hmmmm . How would you say performance and MPG were compared to the stock exhaust ?