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Post by jburd on Sept 28, 2014 18:09:30 GMT -6
So I put it back together and took it for a ride. The back end sway is not quite as noticeable but it is still there. I think I need to change the motor mount bushings. I would definitely feel safer riding. Does anyone know where I can find a set of motor mount bushings for a linhai mp250a scooter? I've seen lots for 150's and lower but haven't found any for my scooter.
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Post by jburd on Sept 28, 2014 14:52:31 GMT -6
Hey guys, I was riding my linhai 250 and the back end felt a little fishy. When I would accelerate or brake the back end felt like it shifted. I got it into my garage. The motor and entire back end swayed about an inch from side to side. About 5K miles ago I changed the head gasket and had to drop the engine so I thought maybe the motor mounts were loose. I took the back end apart and sure enough both motor mounts on the top were loose as well as the main bolt that goes through the top of the engine. I tightened everything up. There is still about a quarter inch of side to side movement. Is that normal or could the main bolt be bad. There are rubber bushings in the motor mounts so it may be OK. I just thought I would throw it out there and see what everyone thought. If that needs to be replaced, does anyone know where I can get that assembly (the bolt, nuts, and the bushings)?
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Post by jburd on Sept 21, 2014 19:16:39 GMT -6
We have replaced the water pump the thermostat and the head gasket. I have gone through the entire cooling system and there are no blockages that I can find. it doesn't make sense. The water pump is definitely pumping coolant. We are kind of wondering if maybe the gauge itself is bad. When my friend got the bike the speedometer was in km. He requested a new one with miles from the dealer. They sent us a used instrument panel with about 500 miles on it. We are kind of thinking there's a reason it was used with only 500 miles on it. The turn signal lights don't work on it and the fan light isn't there. My thought is could it be possible that it isn't overheating but the gauge is just running high. They might have sent us a defective panel. The problems started after we replaced the panel. What we are thinking is that we should use a laser thermometer to gauge the actual temp of the block to see if it is actually overheating. It gets up to around half. It used to be around a quarter. What do u guys think? Does anyone know the actual temp the engine should be running at?
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Post by jburd on Sept 17, 2014 18:04:01 GMT -6
One question comes to mind I thought I would throw out there. When I took the radiator out, I found one of the fan mounts on the side of the radiator was snapped off. The welds that hold it to the radiator came off. In the process of fixing that, the wires to the fan also pulled out of the plug. I had to reconnect the wires. My question is which way should the fan be blowing. I thought there was a possibility that I reconnected it in reverse. The fan is actually pulling air from the outside in not blowing out. Not sure if that makes a difference or not. Thought I would throw it out there to see what everyone thought.
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Post by jburd on Sept 17, 2014 17:51:27 GMT -6
Hey everybody. I need some help here. I am working on my friends 2013 Jonway YY250TT. The bike has less than 1500 miles on it. This thing has been in the shop more than it has been out on the road and I'm at a loss. At 1000 miles we were doing the routine maintenance and decided to drain all of the Chinese cool aid out of cooling system and replace with good Preston 50/50 coolant. Everything has gone downhill from there. We followed the same burping process that I have done time and time again successfully on other bikes including my Linhai 250. The fan kicks on with this thing but it just will not cool the scooter. You think it is working fine and jump on it and go around the block and it overheats. At some point my friend was riding it and actually blew the head gasket. We have replaced that. We have replaced the thermostat. We have flushed it out multiple times and it doesn't help. I actually took the radiator and all the hoses out and flushed it out. There was no blockage that I could find in the radiator. No matter what we do, as soon as we get to higher RPMs the gage just shoots up to between 1/2 and 3/4 and will not come back down. Anybody have any ideas? Please help. I want this thing out of my garage and my friend wants to ride it. This has been going on for the last 2 months.
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Post by jburd on Jul 14, 2014 18:39:52 GMT -6
My friend that owns the bike put that part back together so I'm not sure. In reading through the service manual for this bike and I'm thinking it wasn't put back together correctly. It's the only thing it could be. I am going to take the water pump apart again and see what I find. I will post an update.
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Post by jburd on Jul 14, 2014 18:09:12 GMT -6
Here's a picture from the bottom of the crankcase. The pin hole where the arrow is pointing is where the oil leaks out.  |
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Post by jburd on Jul 14, 2014 17:29:48 GMT -6
OK so here's an odd one I can't figure out. I'm working on a 2008 Jonway YY250T. We had to change the water pump due to overheating which is mounted in the right crankcase. We got it all put back together and now have an oil leak. All of the 8mm bolts around the right crankcase are torqued correctly. The oil is coming out a little pinhole in the crankcase right below the water pump. Oil doesn't come out all the time - only when it warms out. When you first start the scooter, it blows air out the little hole and then once it warms up, oil starts blowing out the pin hole. Any ideas anyone?
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Post by jburd on Jul 2, 2014 8:12:01 GMT -6
Got it fixed.  Thanks guys! I knew it was something simple just couldn't put my finger on it. When I leave a project for about a month, it's hard to remember everything especially being a novice. |
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Post by jburd on Jul 2, 2014 7:19:02 GMT -6
So you guys led me right to it. There is a ground wire that is not connected. We took this apart a month ago so I'm not sure where to connect it. Can I connect it to any of the bolts holding the crankcase?  |
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Post by jburd on Jul 2, 2014 7:06:08 GMT -6
Here is what is clicking.  |
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Post by jburd on Jun 30, 2014 14:08:17 GMT -6
A good friend of mine has a Jonway that we had to change the water pump in. It was still under parts warranty so the dealer sent a water pump kit. To install that we had to remove the crankcase which was an ordeal due to the fact that we waited forever for the dealer to send us a new crankcase gasket. In the end we got it put back together and tried to crank it up. It only clicks. It will not turn over at all. There is a little switch right next to the battery that is doing the clicking. Any ideas from anyone? Not sure where to even start. Is there anything that could have come unplugged inside the crankcase?
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Post by jburd on Jun 14, 2014 5:43:11 GMT -6
Hey guys, I'm sure this is an easy one. A friend of mine recently purchased a 2013 Jonway YY250T. The crazy thing is the water pump had issues and needed replaced. The bike was under warranty so the dealer sent a water pump. To replace it we had to take the crankcase off as it is built right into the side of the crankcase. We now are having issues finding another crankcase gasket. Is this particular engine a CN250 or CF250? It definitely is a vertical engine. We have had a couple of different crankcase gaskets sent and none of them seem to work. The gasket for the CF250 (from pictures that I saw) looks like it will fit but I just wanted to confirm. I'm a little gun shy. This bike has been sitting for almost a month all over this water pump. Here's a picture of the crankcase.  |
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Post by jburd on Apr 18, 2014 9:18:40 GMT -6
Richardthescooter3 or JR, is there any particular difference between slider weights and roller weights? I have a Yamaha clone 250A. Will either work and is there any advantage to either? I don't need any now. I'm just thinking ahead.
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Post by jburd on Apr 16, 2014 10:51:56 GMT -6
Ellpee, I have a JCL MP250A and it has the same connector you are showing. The small tube going on the back (pointing down on your pic) on mine goes to the rear top of the radiator. I have noticed when burping my cooling system, I get air bubbles from 2 places - some come up the main tube going to the radiator and others come from the small tube in the back also coming from the top back of the radiator.
Tavcor, if you have continuous bubbles coming up, you have a leak somewhere. Some air is getting in your cooling system somehow. Do you see any coolant leaking anywhere? I had the same symptoms on mine. When burping, I had continuous bubbles. They never stopped. Mine would run fine and the heat gauge wouldn't go above half, then all of a sudden overheat and build up pressure and flow coolant back through the overflow tank. For me, my problem was the head gasket. Even though I didn't have oil in the coolant or coolant in the oil, (at least didn't see it anyways) the pressure from the combustion chamber was bleeding back into the coolant. Hopefully yours isn't that. But in my opinion, somehow air is getting in.You shouldn't have to keep burping it. I ended up replacing everything but the radiator in mine. I bought a new thermostat, radiator cap, new hoses, and finally a head gasket. I even did a coolant system flush. That might not be a bad idea to start with. That's cheap and easy.
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