broken bougies

[Anonymous]

Hi there,

I have a '78 gs 750. The engine runs very well, but I have a problem with the bougie of the fourth cilinder. I had replaced it with a new one recently, because the old one was broken. (NGK BP8ES) About a month later it was broken again. Is this coincedense, or would I have a problem with the ignition? (bobine or contact points or something)
Does this happen more often? Or would this just be an incedent?
I would like to know how you guys think about it.

Thanks a lot,

greetings

Frank

[Hap Call]

Re: broken bougies

Hi there,

I have a '78 gs 750. The engine runs very well, but I have a problem with the bougie of the fourth cilinder. I had replaced it with a new one recently, because the old one was broken. (NGK BP8ES) About a month later it was broken again. Is this coincedense, or would I have a problem with the ignition? (bobine or contact points or something)
Does this happen more often? Or would this just be an incedent?
I would like to know how you guys think about it.

Thanks a lot,

greetings

Frank

When you say it is broken, how is it broken? Is the porcelain top broken off or is the electrode missing or is there some other way it is broken?

Hap
Je ne sais pa.

[robinjo]

Re: broken bougies

When you say it is broken, how is it broken? Is the porcelain top broken off or is the electrode missing or is there some other way it is broken?

Hap
Je ne sais pa.

When you take it out is the electrode black and smelling of gas? and it doesn't spark anymore?

I have a sus-picion that you are Dutch, is this correct?

btw...

bougie = sparkplug
bobine = coil

Goodluck!

[Anonymous]

yes, you're right, i'm dutch. What gave me away? Not my flawless Englisch I hope?

The bougie is broken means it doesn't spark anymore.
The elektrode is black, and wet from the gasoline.
I don't mean the bougie is physically dammaged.

thank's for your reply's so far!

greetings

Frank

[saaz]

Try a NGKB8ES plug first, the BP is a projector tip plug that is not specified for the bike, at least with the information I have here.

[earlfor]

Re: broken bougies

I have a 1979 750E and the correct plug is NGKB8ES. It sounds as if your bougie is fouling out. Too high a gas level in the #4 float bowl can cause the mixture to be excessively rich. I set my float level at 24-25mm.
Since it is only the #4 cylinder, I do not think it is an ignition problem.
Also, if the #4 carburetor is out of synchronization with the others and drawing too much fuel (an example of excess vacuum) it will cause the spark plug/bougie to foul and not spark.

Earl

Hi there,

I have a '78 gs 750. The engine runs very well, but I have a problem with the bougie of the fourth cilinder. I had replaced it with a new one recently, because the old one was broken. (NGK BP8ES) About a month later it was broken again. Is this coincedense, or would I have a problem with the ignition? (bobine or contact points or something)
Does this happen more often? Or would this just be an incedent?
I would like to know how you guys think about it.

Thanks a lot,

greetings

Frank

[KEITH KRAUSE]

As suggested above, put the right sparkplugs in, properly gapped. Also make sure the coil/plug lead/plug caps have clean, solid connections. If you still foul the plug, you have a carb problem. Any fuel spilling from the floatbowl overflow line?

[Anonymous]

Welcome Frank! You have found just the right forum! There's a lot of GS knowledge on this site.
Stramproy is in Limburg, am I right? Closer to Pete Logan in Luxemburg than Robin and me.

As for your problem:
Earl is right:

First make sure you have the right spark plugs (bougies):
B8ES

Synchronize the carbs, or take the bike to a shop, to have them synched

If all fails, check the float hight, like Earl mentioned.


BTW Frank:
Feel free to email me at: ons-adres@wanadoo.nl , if you have any problem.


And please become an active member. We need some Dutch influence here......

[jimcor]

Now, ain't this hyar innernet one fassinatin' gizmo. Jus yestiddy I didn't even kno' my BIKE had them thar bougies...But, that sure reminds me of a ol'girl frend... she had a set of bougies that would emmm a wrong thread! 8O

[robinjo]

Now, ain't this hyar innernet one fassinatin' gizmo. Jus yestiddy I didn't even kno' my BIKE had them thar bougies...But, that sure reminds me of a ol'girl frend... she had a set of bougies that would emmm a wrong thread! 8O

Only Dutch spec bikes have this special feature :mrgreen: It gives thebike some extra 'swing'. You can go ahead and be jealeous now...

[Anonymous]

thanks for the info.
I did have the wrong sparkplugs, but that has been changed now.