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coil problem?

Joined Oct 2006
46 Posts | 3+
Helsinki, Finland
Hello.

I would like to know how to check the coil of a 2002 FC550 (part# 250 289-01). When measuring the SEM stator I get all the time the correct values, 3KΩ & 168Ω with cold or warm engine. But the spark is not a fat blue one (new plugs) and starting is not easy. When holding the coil wire 10mm form the cylinder head a spark is jumping the gap but not much more. I checked all the other hardware, valve adjustment, camshaft timing, valve springs etc but that is OK. Wiring is OK, new connectors or cleaned. No electrical starter. The kill switch is fine and disconnecting it does not help either. New rubber intake boot and carburettor cleaned.

The coil with wire has a resistance of 3,3KΩ (to ground) and someone told me it should be about 6KΩ but no way to confirm this. The spark plug cap has a resistance of 5,7KΩ and to be sure I ordered a new one. When starting the engine it tries to fire up but fails then to continue. When after a lot of kicking the engine really starts, I was able to restart it many times quickly.

Regards,
Stephan
 
stephan said:
Hello.

I would like to know how to check the coil of a 2002 FC550 (part# 250 289-01). When measuring the SEM stator I get all the time the correct values, 3KΩ & 168Ω with cold or warm engine. But the spark is not a fat blue one (new plugs) and starting is not easy. When holding the coil wire 10mm form the cylinder head a spark is jumping the gap but not much more. I checked all the other hardware, valve adjustment, camshaft timing, valve springs etc but that is OK. Wiring is OK, new connectors or cleaned. No electrical starter. The kill switch is fine and disconnecting it does not help either. New rubber intake boot and carburettor cleaned.

The coil with wire has a resistance of 3,3KΩ (to ground) and someone told me it should be about 6KΩ but no way to confirm this. The spark plug cap has a resistance of 5,7KΩ and to be sure I ordered a new one. When starting the engine it tries to fire up but fails then to continue. When after a lot of kicking the engine really starts, I was able to restart it many times quickly.

Regards,
Stephan

Hello Stephan,

Regarding the values for testing the cdi there isn't any, but if your stator values are good which they seem to be and you are jumping 10mm air gap I would suggest your ignition could be OK.
Regarding the intensity of the spark unlike a points ignitions the spark on a electronic system always seem pale and thin, I think this is my most asked question.
You seem to have gone through all the mechanical aspects but you havn't mentioned if you have been through the carburation, check your needle and atomiser for wear if worn this will give you bad starting, the Dellorto is renowned for these two components wearing.

Regards

Sparks.
 
Hello Sparks,

Thanks for your reply. Meanwhile I was able to have a new coil measured and it has the same resistance as mine. Good to know that the lesser intensity of the spark is not unusual. Should starting improve noticeably when switching for a spark plug like the NGK DCPR8EVX? I will check the carburation anyhow and have a good look especially at the parts you mentioned or just replace them to be sure. Thanks again.

Regards,
Stephan
 
if your carb ckecks out ok have your stator rewound by sparks. you wouldn't believe the difference between his rewound and a stock one.
 
Hello again.

Went out riding after installing a new needle and atomizer (I am lucky to have a Dellorto importer close at hand :D ). Also back to the stock PJ and voila, it starts without sweat. Now I have to sort out jetting with full throttle, terrible bogging. This engine has a hard life in a sidecar chassis and the exhaust diameter is larger than stock. Also the air filter(box) is very large compared to stock Husaberg but that is not an electrical issue anymore.

Thanks so far!

Regards,
Stephan
 
the pipes could be causing the lag. i suggest you get a new DR272 and a DR274 to see which you need.

regards

Taffy
 
Hello Taffy

I installed yesterday a new DR272 atomizer & K51 needle. It looks like Dellorto is not offering a larger atomizer than DR272 for the PHM carburettor ( http://www.motorcyclecarbs.com/Dellorto ... 19C482.cfm ). The main jet is available till 330 and all sizes stock at the Finnish importer 8) . When turning the throttle slowly it is a little better but I am not able to run wide open :cry: .

Regards,
Stephan
 
you can't blame the carb for this problem?

sorry but you'll have to put the bike back to standard to cure this problem. visit a dealer and ask to use std pipes.

regards

Taffy
 

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