Author Topic: No Spark - 84 KX250  (Read 1238 times)

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Offline bishboy

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No Spark - 84 KX250
« on: June 20, 2012, 05:39:56 pm »
Just picked up my new bike and I can't seem to get any spark (it did start previously), I'm checking by earthing the plug against the head. I even took the lead out of the plug cap and bravely held the end while turning it over.... 

I've checked the wiring connections and tried it with the kill switch disconnected, checked inside flywheel and there is no moisture or corrosion.

My next step is to find my multimeter and start checking stuff, but my question is, as I don't have a owners manual yet (getting one of ebay at the moment), what am I checking/looking for, remembering that this is my first MX bike in 20 years??


Offline Hardo

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Re: No Spark - 84 KX250
« Reply #1 on: June 20, 2012, 06:01:22 pm »
Hey Bishboy.... great stuff, the green bikes are the best so I hear ...   :P.

Mate from my experiences with my 83 KX250 (almost identical elec system) recently they tend to fry the low speed stator coil. I did 3 of them until I had Andy Wheeler on the Central Coast NSW rewire one for me. Problem solved. Failing that you could try another CDI unit.

I have a spare CDI and coil unit that I know works so if you get real stuck I could send them to you to try.

I have a manual so if you need any specific answers then ask here.



Offline Lozza

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Re: No Spark - 84 KX250
« Reply #2 on: June 20, 2012, 09:04:10 pm »
One thing to never do wit CDI's is to wind the flywheel over and not have the plug cap grounded. Voltage will build inside the capacitor and look for a way out normaly in the form of smoke
Jesus only loves two strokes

Offline GMC

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Re: No Spark - 84 KX250
« Reply #3 on: June 20, 2012, 09:57:48 pm »
Voltage will build inside the capacitor and look for a way out normaly in the form of smoke

If smoke is coming out then it may have been fitted with British electrics...

Subject: British Theory of Electricity ...
Electrical Theory by Joseph Lucas.
Positive ground depends upon proper circuit functioning, the transmission of negative ions by retention of the visible spectral manifestation known as *smoke*. Smoke is the thing that makes electrical circuits work; we know this to be true because every time one lets the smoke out of the electrical system, it stops working. This can be verified repeatedly through empirical testing.

*When, for example, the smoke escapes from an electrical component
(i.e., say, a Lucas voltage regulator), it will be observed that the
component stops working. The function of the wire harness is to carry
the smoke from one device to another; when the wire harness *springs a
leak*, and lets all the smoke out of the system, nothing works
afterwards.

Starter motors were frowned upon in British Automobiles for
some time, largely because they consume large quantities of smoke,
requiring very large wires. It has been noted that Lucas components are
possibly more prone to electrical leakage than Bosch or generic Japanese
electrics.

*Experts point out that this is because Lucas is British and all things
British leak. British engines leak oil, shock absorbers and hydraulic
forks and disk brakes leak fluid, British tyres leak air and the British
defense establishment leaks secrets .. so, naturally, British electrics
leak smoke.

*From the basic concept of electrical transmission of energy in the form
of smoke, a better understanding of the mysteries of electrical
components, especially those of Lucas manufacture, is gained by the
casual user.
G.M.C.  Bringing the past into the future

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www.geoffmorrisconcepts.com

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