JCL MP250A Lihai 257cc powered / Thank you Rocky and Bob1234. According to the diagram Bob123... turned me on to its a blind hole the seal sits in (besides the shaft coming thru center). Shouldn't be much danger of damaging much with this design . Can be done after variator off. No, I haven't taken the variator off yet Rocky. I've been working on getting my Bobber running To get it ready to sell. Thanks agian, I love knowing what I'm getting into on repairs like this. And I will look for any Crank case venting problems to boot .
JCL MP250A Lihai 257cc powered / I was running an open CVT (no cover). I was doing research on tuning the CVT for optimum performance. BTW, No belt shredding going on. Belt up to width spec. Was keeping to close of an eye on it for any negligence junk to go on. My main question right now was can I pull the variator side crank seal from the outside of the engine with a drilled hole with a screw in the seal with a pair of pliers or simular ?
JCL MP250A Lihai 257cc powered / Sorry I have no answer for you. All the ones I've ever switched were on carburetors. I would just do what you have tried already. Twisted them out with vise grips . Try this, Find a nail or small bolt that fills the hole in the brass fitting. This will keep the brass fitting from collapsing while you really get a tight grip on that mother with a good visegrip again . Then try to twist it out again with vigor with no fear of collapsing it . Then if you still can't get it out without twisting it in two, Heat the head up with a burnzomatic and repeat. Doesn't matter much if you damage the aluminum head with heat because its crap already. Sometimes you have to do this 2 or more cycles to break a stubborn or rusted bolt loose. If it's gonna come out this will get it.
JCL MP250A Lihai 257cc powered Just did an oil change on my JCL and made double sure not to over fill it to get that out of the way right off. Went for a quick 5 mile rounder on her and right before I got back to the house I hear a loud hissing sound over the motor sound for about 5 or six seconds then the scooter quit pulling. Oil all over the CVT .Someone please tell me there is a replaceable shaft seal from the outside of the engine under the variator. I have not done a full investigation but I think this is where it is comeing from. Has this ever happened to anyone else ?
JCL MP250A Lihai 257cc powered Yes you can certainly gain legroom by modding the seat of my scoot too. So I got under the seat and took out some plastic where your rump backs up against a little wall. That wall is gone now and I have an inch or 2 leeway and actually more comfort. PS My handle bars are fixed . (welded in place from factory).
JCL MP250A Lihai 257cc powered / Update, The battery I bought last August is still a trooper. No signs of ageing and/or weakening. If this keeps up I am loyal to a battery brand now. Everything I bought before this battery online was junk. A lot of times I would have to nurse them along just to get a year or more out of them. I'm sold so far on Bikemaster gel batts. Will keep you members updated. If your anything like me you have had battery problems in these 250 scoots. Especially in the far south where its above 100 F degrees a lot.
JCL MP250A Lihai 257cc powered / After all this time no one has ever bought and/or installed this rather expensive mod ? I want to buy and install the big bore kit on my JCL MP250A Linhia scooter engine. But I have absolutely no verification how it will effect my performance. It has been quite a while since I've been looking for the elusive person that may have bought one of these. Still no one has one huh ??
JCL MP250A Lihai 257cc powered / But ya gotta love that CVT if set up right on a scooter. It will accelerate just as fast or faster than raking gears but without the fuss and muss. The SR 400 you still have to rake gears, gauge a clutch lever to stop and go. Now that I'm "Not" doing wheelies and burnouts I can do without all that.
JCL MP250A Lihai 257cc powered / Believe it or not I bet you a bunch they are a good deal slower than the originals. The reason being is the Honda engines of the day were Over head cam engines. I can tell by the heads I am seeing here that these engines are Over head VALVE. The early 4 stroke engines in this style bike were race bread engines Honda sold in the 90cc, 100cc, 125cc single cylinder CL, SL and so on bikes. I have a 1976 CL 125cc Honda that will outrun my 250 cc Bobber. They are both 4 stroke singles . The difference is the 250 is a OHV and the 125 is an OHC. BIG difference in how they perform. They sell the OHV engines these days because they are easier to warranty. They are longer lived due to the mild nature of that design. The over head cam design usually does'nt last as long because you can over rev them and run the snot out of them. But boy are they more fun !
Last Edit: Dec 19, 2016 20:22:27 GMT -5 by 4950cycle
Welcome to the site! Sounds like you got a good deal for $300!
No spark often means a bad CDI or coil, or both... I'm an old-time biker from the 1960's chopper era, and old age and arthritis got me off the big bikes and onto scooters... My first scoot, a Chinese Xingyue 150 taught me ALL about the "Chinese bugs" these things offer... LOL!
The first year, my CDI and coil both went bad at the same time. You'll get yours running and have fun with it. And you are right about too much involved with any attempt to change the drive-train to clutch-n'-gears... These scoots are designed with a CVT setup from the get-go. I've never even seen one converted to a manual tranny... First, you'd have to find one... The CVT tranny is fine with these scoots, and simple.
Please do post some pix of the project! I agree with Oldchopperguy, My JCL 250 has an ignition system just like a 150 , same parts even. Both my coil and my CDI must have went at the same time. Thats why it took me a week to figure out what the heck was wrong. Didn't help that I got a bad CDI off Fleabay that put a fly in the ointment to say the least. BTW Ditto on the good buy at $300 And, ride safe!
Leo in Grapevine, Texas
JCL MP250A Lihai 257cc powered
Last Edit: Dec 14, 2016 21:19:00 GMT -5 by 4950cycle
JCL MP250A Lihai 257cc powered / REMEMBER ! The reason we got away from them is they weighed like a 1,000000 Lbs. A 600 four these days makes more than enough hp. and is skads lighter . Now, If they would just put a motor like that in a human body friendly frame like the CB 1100s but still keep it on the light side.