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Old 15th December 2010, 08:15   #1
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Default 1989 Bullet(Standard)350 CC oil leak from below the spark plug..help needed

Hi,
Expert advice request..
I own a 1989 350 Cc standard bullet.
Recently I have been noticing oil leak from underneath my spark plug (cylinder head). When I slightly increase the accelerator I could see small oil bubbles (air bubbles?) coming out from underneath the seat where spark pug sits.

I consulted with my mech. in Bangalore and he says the head needs to be replaced as an aluminium welding cannot fix the problem. He also tried initially fixing the problem by using Araldite adhesive..but no use..still the problem persists.

Has anyone of you had this probem with your bullet before? How did you resolve that?

How much would a bullet headnew) cost? My mch.quotes 5000-6000 INR.

Is there any other solution rater than a Head replacement?

Best,
Makesh R
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Old 15th December 2010, 11:23   #2
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Default Re: 1989 Bullet(Standard)350 CC oil leak from below the spark plug..help needed

Quote:
Originally Posted by makeshr View Post
Hi,
Expert advice request..
I own a 1989 350 Cc standard bullet.
Recently I have been noticing oil leak from underneath my spark plug (cylinder head). When I slightly increase the accelerator I could see small oil bubbles (air bubbles?) coming out from underneath the seat where spark pug sits.

I consulted with my mech. in Bangalore and he says the head needs to be replaced as an aluminium welding cannot fix the problem. He also tried initially fixing the problem by using Araldite adhesive..but no use..still the problem persists.

Has anyone of you had this probem with your bullet before? How did you resolve that?

How much would a bullet headnew) cost? My mch.quotes 5000-6000 INR.

Is there any other solution rater than a Head replacement?

Best,
Makesh R
Hi Makesh R, if it is from the bottom of the spark plug, it seems like a crack that has developed due to over tightening of spark plug. The compressed air fuel mixture must be what you see leaking out of the place. Are you experiencing lack of power with your machine !Check out with an expert mechanic and see that it can be corrected in the lathe and keep reading the thread for what our TBHP Bullet experts have to say.
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Old 15th December 2010, 13:29   #3
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Default Re: 1989 Bullet(Standard)350 CC oil leak from below the spark plug..help needed

Another guy faced a similar problem wherein his bike's head had developed cracks. He was suggested TIG welding to get the crack repaired & he has been doing fine till now without any issues

You can try out this option in case there is a crack, as it will be much cheaper than procuring a new head.

Ride safe.
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Old 15th December 2010, 14:14   #4
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Default Re: 1989 Bullet(Standard)350 CC oil leak from below the spark plug..help needed

Hi,
Thanks for the quick response.
It's not because of a crack but due to the slightly oversized hole into which the spark plug fits in.
According to the mech. , the hole size of the spark plug slot got increased to 2 sizes in a previous lathe work. A heat welding can only reduce the hole size down to one but not to two it seems.

Best,
Makesh
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Old 15th December 2010, 14:26   #5
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Default Re: 1989 Bullet(Standard)350 CC oil leak from below the spark plug..help needed

This is the thread blackfire is talking about: http://www.team-bhp.com/forum/motorb...nder-head.html (Bullet 350 Standard Air leak from cylinder head)

Ironically, my bike had a similar problem and I just gave it to get the head welded and came back. I don't think you would want to change the head for this.

This is where my leak occurs, indicated by the arrow. But it looks as if it is leaking from thespark plug screw area, but it is actually not.

http://www.team-bhp.com/forum/attach...-head-leak.jpg
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Old 15th December 2010, 16:18   #6
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Default Re: 1989 Bullet(Standard)350 CC oil leak from below the spark plug..help needed

I had a simila problem firstly the aredlite did fine and then planed to get the plug adapter redone but havent had the time. but the aredlite is still holding up.
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Old 15th December 2010, 21:04   #7
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Default Re: 1989 Bullet(Standard)350 CC oil leak from below the spark plug..help needed

If you are talking about that hole (meant for spark plug) having become bigger, then there is something known as re-threading which mechanics do. A hollow piece with threads inside is fitted into this hole so that the size is reduced. I am not writing the details here, nor will I be able to explain much here but ask your mechanic about it. I am sure he would know.

Ride safe.

@jinga: Thanks for the link man, I had myself tried but failed at finding it.
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