Sophomore Rider
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Post by CopperDeer on Aug 7, 2013 17:15:52 GMT -5
Yeah I would have definitely screwed mine up it sounds like. Sucks you had to learn a lesson the hard way, but it'll save me from it! I'm putting in a Airsal "sport" 70 cc kit  I'm going to try derestricting my stock exhaust at the same time so it'll be like a whole new monster. |
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New Rider
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Joined: Jul 20, 2013 15:15:52 GMT -5
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Post by nassauequipment on Aug 7, 2013 17:38:38 GMT -5
another cruel joke on the air-cooled two stroke user, whether its for a chainsaw , trimmer, blower (which all turn from 7,000 to 10,000 rpm no load and some even more) that displace 30cc to 70cc + or a scooter which at 49cc is smaller than some of the back pack blowers we sell. Out boards are generally under 5000~5500 rpm and are WATER cooled which means their operating temps are way lower.
There is simply NO one oil fits all on two strokes.
I had a landscape customers crew stop at a convienence store and pick up some because they were out of oil.
Took half a day to clog the exhaust port, a piece of carbon broke loose and scored the exhaust port side of piston and cylinder.
Don't expect them to make good on the expense , they won't,... even though they have all those pictures on the bottle.
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Post by skuttadawg on Aug 8, 2013 2:23:41 GMT -5
Here is 40mm ( 50cc ) and a 47mm ( 70 ) cc piston . Yeah 7mm does not sound like much but WOW I have so much more power along with a racing pipe . I too put in a lil oil in the gas tank at first as I worried the oil pump would not deliver enough oil . It is surprising that the gas not only powers the engine but helps cool it where extra oil it can get hotter . I had a bad seize on the 50 while testing a Uni and a soft seize with the first BBK while riding at 10,500 RPMs on a hot day . It cooled down and I rode it home . I had a wristpin come out and eat up the piston and aluminum head . I was noid to prevent it from happening again so I added oil at first to be safe or so I thought . I have never had a premix seize on any of my 2T mopeds or motorcross bikes . Premix can be a safe option but a hassle compared to the ease of an oil pump . You can get a Mikuni oil pump which is way better than the stock one but will need to replace the throttle cable with part # 159-26 from PFS or Scrappy as its needs a lead like the carb has with the Mikuni . Use a synthetic blend like Maxxima at first then you can go full synthetic after you use up a quart . I still use Maxxima as its 10 bucks as easy to get . i have used Motul 710 full synthetic with ester but its 17 a quart and only one place sells it . Never use weedeater grade oil its junk , smokes and fouls the sparkplug . .My pedal mopeds that used cheap 2T oil would leave a com trail Maxxima and Motul only have a lil smoke at start up when it is cold . Do nor use Lucas as it does not stay mixed . I drained the bowl and had the oil come out then the gas . It has a blue dye in it . Make sure to lube the piston and cylinder with plenty of 2T oil or engine assembly lube . One side it was hard to insert the wrist pin so I installed it in my hand so I only had to put in the other side once on the connecting rod . Make sure the arrow on top of the piston is pointing towards the exhaust pipe . I gave the wristpins a tug to make sure they were in they good as me and another had one come out and ruin the day . Only use premium gas , nonethanol preffered and use a NGK BRP8HIX which is the iridium type . Some run a 7 but the 8 is cooler heat range . Here is a 2T jet kit that may work with your carb www.partsforscooters.com/114-50-Minarelli-Main-Jet-Kit?sc=34&category=133078Some use 10mm wristpins some 12mm so measure with a caliper before you order a kit . If you have the cabbage then you may want a complete power kit like this www.partsforscooters.com/169-210_Power_Pack?sc=34&category=133355Attachments:
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