Carb Issues or Electrical Failure

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C5Performance

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Hortonville, Wisconsin
We get calls and emails regularly explaining a problem with starting or running of old cycles.
How do you determine if the bike is starving for fuel or losing spark?

Here are some items to check first...

Does it start or run worse in lower temps? Varnished or partially blocked carburetors act up more as temperatures drop.
Did the problem start just after you did something? You wired up new driving lights, changed a battery, went on a trip and tried some new type of fuel??
Does your engine run better with the choke partially on? This is an indication your engine needs more fuel.
Does your engine run better with starter fluid sprayed into the intake? If engine rpm goes up, you're engine is starving for fuel. If the engine drops in rpm or stalls, you have an ignition failure.

If you determine the carbs are the problem, find a reputable shop or friend who KNOWS what they are doing. If they haven't worked on your particular style of bike, you may want to keep looking. If you determine it is ignition related, try a few things first.

1) clean and tighten your battery cables. No really, it can be that simple.
2) Test for proper battery voltage. It should read above 12 volts with the engine running.
3) Verify voltage at your coil lead (the wire lead that feeds power to the coil...Hondas often use a black wire).
4) Verify that you have voltage at your points set (on GL1000 anyway). If not, you might have a wire harness issue or broken lead. I have seen this twice already.
5) If you have points, make sure they are CLEAN and adjusted.
6) Remove the sparkplug boots and unthread them (i think GL1500's are molded on). If the end of the wire has signs of corrosion, cut off the last 1/4" of wire and thread the cap back on firmly. On GL1000 i have seen many wires that are soft like toothpaste. I've never been able to repair this, and always end up with new coils.
Oddly enough, most sparkplug wires get hard with age and the GL1000 can get soft. Please tell me why if you know the answer!!


We introduced the first Goldwing ignition kit due to the high failure rate of coils on my personal bikes. Between my bikes and friends i knew, we have tested half a dozen coils that failed. Usually the bike ran rough and started hard but just as often the bike just seemed sluggish and didn't sound smooth anymore.

Before ordering a replacement ignition, you should always verify the above items to be sure you really need to replace yours.

With the optical reader and quick connector on our QT coil, installing your new ignition is easy, but nothing is more frustrating than installing one and discovering you really have carburetor problems! Hey, we speak from experience. The only way to learn sometimes is to fail.

To read more about how ignitions work and find solutions go to https://www.c5ignitions.com/technical.html
 
hmmm yes ...in most cases the oldwings are old enough and unkept to the point both issues are involved its why so many get stumped trying to fix things ...happens to all of us no matter how much experience one gets working on them something new crops up you never dealt with ....
 
:thanks: Paul for the great advice. We have a tendency to ignore the simple faults and head for the major ones. :good:
 
Spent a lot if time yesterday morning chasing a short in the flasher circuit of a Freightliner only to find the PO had bypassed the circuit and it was a faulty flasher can :doh:
 
When the young techs at the shop i just retired from see a set of points, they seize up tight and don't have a clue how they even work. :help:

I think it is more difficult to trouble shoot electronic ignitions than points, but have found when a "Dyna" style ignition fails, you can typically test to see if the coil "shuts off".
Every one i have ever tested will NOT turn off the coil so obviously the ignition is not going to fire the spark plugs. The trigger has essentially cooked itself and the coil is always on. This might also explain why people say it wont start but if the key is left on the battery goes dead right away. No doubt...since the coil is on all the time!

Did you know many electronic ignitions turn the coil on over 250 degrees before TDC? This assures coil saturation but also causes coil failure on bikes that idle alot (anyone live in the city?). :head bang:

We turn our coils on around 50 degrees at low rpm and slowly work towards 140 degrees BTDC once we reach 8,000 rpm! That's one reason we can run our ignition all day on a small battery when road racing, while a standard after market ignition will sometimes fail after just 15 laps. Sorry for the rant...I just love technology! I'll get down from the stump now. :whistling:
 

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