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Interesting scenario - CB77 drops EITHER right or left side!

Points Based Ignition | Electronic Ignition Upgrade
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GG
honda305.com Member
Posts: 149
Joined: Tue Apr 13, 2010 10:45 pm
Location: Costa Rica

Interesting scenario - CB77 drops EITHER right or left side!

Post by GG » Mon Feb 07, 2011 8:14 pm

Greetings to all from warm Costa Rica! Sorry about all of you fighting the snow and cold. I hope you are able to stay warm!

My 1966 CB77 Superhawk periodically drops either the right or left cylinder, often after drifting down a long mountain - so the motor has cooled down and sucked gasoline in. The funny thing is, I can get the cylinder firing again if I remove the plug cap and hold it about 1 inch away from the spark plug! I assume I'm creating more resistance somewhere, but why that fires the plug is 'way beyond my electrical powers.

For the record, I'm running a hotter plug (the NGK #6 rather than the #8), the points are adjusted and the bike is timed correctly. When both cylinder fire (!) it runs great (that means uphill). Does this sound like a condenser issue?

GG

teazer
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Joined: Mon Feb 08, 2010 10:32 pm
Location: Midwest US

Post by teazer » Mon Feb 07, 2011 11:38 pm

Sounds to me like it's too rich and on a long downhill there's a high vacuum pulling in more gas that it needs.

Moving the plug cap away means that it takes a higher voltage before it jumps and that fatter spark will light a rich mixture or a lean one better than a stock spark.

Try dropping the needles one notch.

GG
honda305.com Member
Posts: 149
Joined: Tue Apr 13, 2010 10:45 pm
Location: Costa Rica

Spark problems

Post by GG » Tue Feb 08, 2011 8:35 am

Hi Teazer - thanks. I'll give that a try!

GG

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