jinlun 250-5 texan 2010. no spark at plugs fitted new stator. new sender. new side stand switch. new cdi unit. new cutoff switch. new battery. new wirring harness. new spark plugs. new coils and leads.still no life.help
Year: 2010Make: jinlunModel: jl 250-5Engine: 250 twin 4 stroke engine
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HI. how exactly is spark being checked? Is the spark plug (preferably a new one) being grounded solidly to bare metal on the engine block? To test much further, a digital multi meter will be needed to trace wiring issues. Spark can be very faint but present - also is there a safety tether on this unit? switch verified to be on (both key and slider switch) ?
checked out both key & slider switch & bypassed all still no spark correct readings from stator. new cdi unit
OK. still haven't answered the first couple questions for the info request - How is spark being checked , is it a new plug, is it grounded to confirmed engine ground (bare metal on engine block, not frame, as engines are often insulated from frame by vibration isolators) Since you appear to have replaced all the parts possible to affect spark, we're left with wiring or ground side issues, or one of the components you replaced is bad out of the box (not that uncommon) - "new" is not the same thing as "good".
Have done the spark plug test as you have mentioned. on good clean engine block and new plugs. new components have been changed for new
to overcome the risk of faulty parts. the engine is insulated from frame
OK. try this one: If you have one, take a jumper wire (or jumper cables) attached to the engine block (bare metal) and to the frame (Bare metal on frame) to establish a good ground from engine to frame - If the grounding strap or connection has failed, or loose or corroded, it could also prevent a spark. Beyond that, if you have a digital multi meter, probe to the ignition coil and other probe to ground and see if you get a varying voltage (If you happen to have a "Peak Voltage" function on the meter, even better) Should see spikes of voltage up to around 5v peak, or should see the voltage varying while cranking around 1v or so on a regular meter - if you do have that then ignition is sending signal to the coil, coil should be firing, so it may be on the ground circuit in that case. I'm not familiar with your specific engine brand, but most of the Chinese engines for these are virtually the same, and work about the same way.. But I'd try the jumper wire from engine to frame to ensure a good ground connection all the way around, and see if that does anything. I have seen some cases on Chinese engines where the spark is extremely faint, and very hard to see, but engine otherwise runs good - have you tried putting the plug in and see if it will fire on a shot of carburetor cleaner? (and how is compression for that matter. I had one not too long ago that was similar to this in that the owner replaced all the ignition parts from not seeing a spark, but all it needed was a valve adjustment to get it running. - there was no clearance on the intake valve.. we also replaced the key switch due to that it would only fire a spark when key was returned to "run" position, but would not spark during cranking.)
Sorry for the delay its are bank hoiladay ive been away.tried groud earth and made good ground earth connection. no spark. tried both new plugs in cylinders to start would not fire up.intake valve & exhaust valve settings correct.tried carb cleaner. key switch checked.
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Bypassed ignition switch side stand switch stop switch done ground earth correct voltage from stator no life at cdi unit.
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Hi, if you still need help with this I think I can assist. My shop provided warranty repair and general service for several of the importers of these bikes and I'm quite familiar with most of the problems.If you do need help, can you tell me if there is a black wire with a white stripe going to the CDI unit?Thanks, PK.
Yes there is a black wire with a white stripe at cdi unit.
Yes there is a black wire with a white stripe going to the cdi unit.
Hi, follow that black and white wire to a spot where you can disconnect it. You may even have to cut it, if so, leave plenty of room to splice it back. You do not want to disconnect it after any junction, so at the first opportunity, disconnect it.Then see if you have any spark. If you do have spark, keep in mind that this is the kill wire, so if you start the machine, you'll need to be able to ground it to shut the engine off. The electrics on these machines are not very good. Mostly we see switch problems in one of the kill circuits or we see broken wires or shorts. They can be an absolute nightmare to find without just re-wiring circuits so it's best to just cut to the chase and go directly to the end of the circuit. By cutting or disconnecting that wire, you remove all safety switches and cut-off switches from the equation and isolate the CDI unit. If it does fire with the wire cut, you know it's a wiring or switch problem. If it doesn't fire, then we have an idea where to start looking.If it does fire with the wire cut, then I almost always will just install an on/off switch between the CDI and ground and eliminate all the problems with switches. Because I can almost guarantee that once the wiring or switches start going bad, they'll all start to fail soon after.The upside is that while the wiring and switches are seldom very reliable, the engines and transmissions can be extremely good. Just change the oil regularly and keep things clean and you should get many hundreds of hours out of the powertrains. I've worked on literally hundreds of the Chinese ATV's and Scooters, quality is not very good on some aspects, but the engine and transmission designs are great. All they are is a clone of 80's Honda and Yamaha's, I even use the same parts to keep my 80's Honda 3-wheelers running, much, much cheaper than buying essentially the same parts from Honda.Let me know what you find by doing this test and we can go from there. I think we can get you up and running with just a little testing.Thanks, PK.
Retired Owner of a full service shop and national parts sales website.
sorry late reply againe did the test with black and white wire still no spark.
Can you tell me how many, and the colors of the wires coming out of the CDI? There are several different ones and I need to see which one you have to know where to test at. Is the engine out of the frame?