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Post by barnie on Jun 13, 2013 19:04:38 GMT -5
Richard, anyway u can rig up a small temporary gas tank and put it under seat and left it gravity flow to carb to see if you can narrow down the problem? How much gas comes out the fuel line when u disconnect it at the carb and turnover the engine. Need to isolate if problem is from tank to carb or carb beyond. If you rig up a small temp tank it would have to have a small vent hole in order to run to tank. Keep at it, you'll find the gremlin. Barnie ;D
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Post by barnie on Jun 12, 2013 20:16:19 GMT -5
Richard, take it back to the same hill and run it wot like u did the other day. If it cuts out on u again I would sure lean hard toward the fuel pump. Also if it cuts out again at that point loosen your gas cap and see it it will start. If the vent hose on the tank gets plugged up the gas cant run out of tank to pump. Be careful so gas does not come out of tank and start a fire. VApor lock would be something to consider if you think the engine got good and hot (not overheated) but hot from working hard on the hill at wot. Let us know. Barnie  |
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Post by barnie on Jun 11, 2013 19:51:08 GMT -5
Richard, my 1st guess is you  have been just running out of gas at wot up a hill. At that point the vacumn the engine is putting out is very low and may not have been enough to deliver the fuel to the carb or you have a slight vac leak in the line from manifold to pump. I have a JCL MP250a with the linhai 257 engine and I had fuel delivery issues so several yrs ago changed over from vac pump to elec pump and the issues disappeared instantly. JUst unhook the line at carb and crank over and see if you get any gas as if you do you very well may have a vacumn issue. Let us know how u make out. Barnie |
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Post by barnie on Jun 5, 2013 16:13:34 GMT -5
Jarlaxle, my 1st guess is your clutch pads and bell are just glazed. Take the bell off and clean it up good and take some sand paper and clean/rough up pads on the clutch. With 10,000 miles a belt change probably would not be a bad idea also. Barnie
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Post by barnie on May 30, 2013 20:01:28 GMT -5
Your fuel pump may be getting weak also. At wide open throttle your vacumn from the engine drops drastically and the pump just may not be putting out enough gas to keep the carb bowl full, thus u basically run out of gas. I eliminated all fuel del problems with my linhai 257 by convert it to elec fuel pump. Have not had any problems for several years. Also like Alley said, with 5000 miles and never had valve adj, its time. I would adjust the valves 1st and if that does not take care of problem, then I would try fuel pump next. Barnie |
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Post by barnie on May 30, 2013 9:23:36 GMT -5
On the very end of the rubber part that slides on carb mine had a little molded grove for the clamp to fit down in (so the clamp could not slide off). I cut just that little flange sticking up off which let me put the clamp at the very end of the rubber. then just slide the rubber end on tight up against carb and put clamp up tight against carb and mine holds good. Got my clamp at Do-it-Center hardware store. It's about 1/2 as wide as orig clamp. You only cut off about 1/16 or so of the end of boot. Just enough so boot and clamp fit tight against back of carb. It moves air box just a bit forward so start the I start the air box bolts 1st. don't cut much off or your airbox mounting bolts wont line up. Barnie  |
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Post by barnie on May 29, 2013 19:18:05 GMT -5
I have a JCL MP250a with linhai 257 engine. My speedo was off also so I bought a Astrale Cateye electric bicycle speedometer. the Cateye 8 will read up to 185 mph. mounting takes a little fiddling but end results are the little magnet attached to hub on front wheel with the sensor mounted on fork and you measure outside dia of tire in inches and convert to millimeters and set the speedo head to match. This thing is dead accurate at all speeds checked with my suv. It also has an odometer etc. I rarely look at my in dash factory speedometer. Barnie |
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Post by barnie on May 29, 2013 19:05:13 GMT -5
richard, can u cut the little lip on the end of the air box rubber where the clamp is. that will let u push the hose and clamp right up to the back of carb. I put a narrow clamp also on mine. make sure mounting bolts are started but loose when u do that. will that work for u?? Barnie |
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fuel pump
by: barnie - May 28, 2013 6:42:46 GMT -5
Post by barnie on May 28, 2013 6:42:46 GMT -5
I have a JCL MP250A with the Linhai 257 engine. I replaced my orig pump with a Mr Gasket 42s elec pump. It is more work as u have to run a switched wire with a inline fuse etc and I replaced all my fuel lines several yrs ago at the same time. I starts at the touch of the button and I have no run out of fuel at higher speeds because of the lack of vacumn. So far I have had no problems. The vacumn pumps are good also just get the best one u can. If I turn the key and don't hear the pump I know its not going to start because of fuel. Hope this helps. Barnie |
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Post by barnie on May 23, 2013 18:52:27 GMT -5
Ridecheap, I also did away with factory fuel pump and put on a mr gasket 42s elec pump. Have a JCL mp250a that runs like a charm. I also have the micro filter that screws on the end of pump. Barnie |
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Post by barnie on May 9, 2013 5:54:45 GMT -5
Longterm,, like Rockynv said, just don't run it wide open the whole way there and keep an eye on ur temp guage. I don't really care for the interstates as u just don't get to see real America. My JCL 250 has the linhai 257 engine in it and I do 100% of the work on it (so I know its done) and in 5 years has never caused me 1 problem, she runs absolutely perfect. I've run it all day frequently. Just do a little pre-trip check air pres in tires/ck all fluids etc and ur good to go. have a good time and enjoy the trip.. Barnie |
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Post by barnie on May 8, 2013 19:15:41 GMT -5
Longterm,,you should not have any problem at all. I have a JCL MP250a and run it on trips like that, no problems. If u are in doubt and would be more comfortable why not use state hwy's and just run a little slower and enjoy more scenery but the scoot will make if no problem if it's in good shape. What kind is it? Barnie |
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Post by barnie on May 8, 2013 17:13:17 GMT -5
Barry, I have a JCL MP250a (virtually same as urs). Pull the front off and its just a little square black box with the wires plugged in to it. While you have the front off check all the wiring connectons and screws nuts and bolts to especially the little screws holding the wires on the back of instrument panel. The bright green wires are the ground wires and can give u fits. Hope this helps u. Barnie h |
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Post by barnie on Apr 24, 2013 18:05:53 GMT -5
JR,,THE VALVES GET ADJUSTED IN MM AND NOT THOUSAND'ths, CORRECT. JUST DOUBLE CHECKING MYSELF. HAVE NOT ADJUSTED MINE FOR A WHILE BUT IS IS STILL RUNNING VERY GOOD. THANKS BARNIE
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