spark plug

[td007]

my spark plug just blew up in my gilera dna ok but the threded end of the spark plug is still in my engine the rest of it shot out
why did this happen does anyone know
also what can i do to fix it thanks



urgent[/b]

[TUG]

what does the bike still turn over? i would think to get the rest out you would need to take the head to a mechanic so he can get the thread out.
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Haz ER-5, innit!

[td007]

yes still turns over

[TUG]

i dont know what you could do other than take it to a mechanic, if you cold post some pics up on here that would be great.
____________________
Haz ER-5, innit!

[stinkwheel]

Could have been overtightened when it was put in. Could be corrosion from being in there a long time. Could be a faulty plug.

If you are confident what you are doing, I'd try an ez out on it. It's a thin thread and a big ez out.

If it's a 2-stroke, I might even try whipping the head off and tapping the thread remnant round with a punch.

If you think there is any chance of either breaking the extractor or dropping something into the engine, stop and take it to a professional.

If it's a 2-stroke. Worst case a new head costs about £45. A 4-stroke head would be more expensive and harder to fit.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[TUG]

[td007]

it a four stroke 125 will it tell me in my workshop manual how to get the head off

[TUG]

am sure my eyes are gone, i swore i read 50 after DNA.
____________________
Haz ER-5, innit!

[stinkwheel]

[td007]

where can u get the ez out things

[Cigaro]

Surely removing the head can't be that big a job? Obviously the valvetrain drive gear will have to come off but with the aid of a workshop manual and proper tools I can't see it being that bad.

[TUG]

manual here covering all the gilera models upto 04 if you need info
____________________
Haz ER-5, innit!

[Barry_M2]

[Finglonga]

[stinkwheel]

I presumed he was meaning the plug had broken round where the hex joins onto the thread. Whenever I've had this happen before, all the rest of the plug has come away in one piece leaving you with just a 'collar' of steel thread screwed into the head, seems to be a weak point.

Is this correct?
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[td007]

yes just the threded bit left in the head
i will get u a picture later if u can upload them on here

[td007]

https://i188.photobucket.com/albums/z117/trist077/DSC00022.jpg

this is the spark plug if this is a better idea

[Barry_M2]

[holyman]

get it to a mechanic. Removing a 4 stroke head is fairly invlolved for a novice.

[Phil_P]

Although involved, if you want to learn about working on your bike, I can't think of a better time to do it. If you can get a manual and are fairly adept with your hands you CAN do the work yourself.

When I started messing with bikes (four strokes incidentally), I taught myself by doing things. I would never have dreamed of taking a bike to a mechanic for dismantling, if for no other reason than I didn't have the money available.

I am pleased for those that have enough disposable income to hand over problems to someone else to sort, but to me, a large part of being a motorcyclist is getting my hands dirty and having the reward of making my bike work again by my own labour.

I realise that there are some for whom, being their own mechanic is a no-no, but please guys, don't scare off the younger less experienced members of the forum who would like to give it a go by throwing your hands in the air and saying 'take it to a mechanic'.

If the plug has broken off so that the washer has come free, then there won't even be any torque still holding the remains in place, so it should only be finger tight. Push a largish screwdriver into the bit that's left, give it a light tap with a hammer and the chances are that it will unscrew quite easily.

Ask around for a friend or relative to lend a hand or just point you in the right direction, and I'll bet you can do the head off bit yourself too. Save yourself a fortune and know the job's been well done.
____________________
It is not enough to win, others must fail.
Moto Guzzi 1100 Sport Injection '96

[td007]

me and my next door neibough are goin to have a look at later as next door has done some mechanics before and i am willing to learn how to do things

were going o try and get it all out in one piece if we can e.g. the thread and the remaining bit of rod that sparks at the end
if goes as planned ok i think if not gonna work how to get the head off in the manual and clean the engine of the remaining bits

hopfully we will get there

[Phil_P]

Good for you, don't be put off. Work steadily and methodically. If you have a digital camera, take photos as you go of anything that might be confusing on re-assembly. Lay out the parts you take off in a logical way. If you put down parts on pieces of paper, you can write down where they are from.

Can be handy to get things like gaskets in advance so you can put it back together without any delays.
____________________
It is not enough to win, others must fail.
Moto Guzzi 1100 Sport Injection '96

[td007]

bought a tap and die kit today and goin to see if the rest of spark plug will come out first if all fails then the head will come off
the neibough has not had a look today hes not had time so goin to have a go myself

also its hard place to get to, striped the dummy tank out etc cant work out how to drop the fuel tank out for easier access or weather to drop the engine out and do it can anyone help i cant find it in the manual thanks

[feef]

[Barry_M2]