Spark Plugs backing out

[finman]

Is there a trick to keep the spark plugs from backing out? They seem to back out quickly. I have them pretty snug not super tight. I dont want to strip out the head.

[Justintoxicated]

They should not back out, are you using a stock head?

 

if so you may be getting slight detonation.

 

Need mroe info, like type of head, Compression, altitude, and temp.

Edited March 13, 2006 by Justintoxicated

[finman]

They should not back out, are you using a stock head?

 

if so you may be getting slight detonation.

 

Need mroe info, like type of head, Compression, altitude, and temp.

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sorry I thought the info was in my profile.

2002 banshee, cool head,18 domes, +4 crank, sand port, 110 octane fuel.

Sea level in Oklahoma.

 

Thanks,

Finman

[Justintoxicated]

Which Cool head?

 

it could be something like a dome being loose in the head, I got a bad dome a while back and it caused my sparkplugs to back out. The domes were about 1000th of an inch off.

 

Otherwise your detonating.

 

My guess is detonation, how much compression do you have?

 

I run 19CC domes at sea level but my compression is lower due to porting. I mix 50/50, if I was to drop to 18 I would have to run 110, but again I have porting so my compression is only 170.

Edited March 13, 2006 by Justintoxicated

[finman]

is there something I should look for on the spark plug to see if detonating?

[hittintrees srh]

if your running 110 octane, its not detonation.

 

trinity has plug clamps that would help you out-they look pretty sick too.

[FASTOYS]

Doesnt matter if he is running 118 ...... If its backing plugs out , He has detonation trouble from what i have seen. Better get to checking for an air leak or a lean condition !!!

[Shee-Male]

is there something I should look for on the spark plug to see if detonating?

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useually spotting.

[Bansh88]

trinity

[BigRed350x]

Weld em in there, they won't back out.

[sheefreak]

I have a Trinity plug lock if you want it for $20 shipped. But as Jeff stated, if they are backing out, you have problems. Only time I had a problem, I was fairly new to two strokes so I bought the plug lock. Shortly after, I figured out I was really lean!

[badassbanshee479]

dont get the plug lock, the plugs backing out is the only thing saving your motor!!!!

you go locking the plugs down and it will blow sky high! check your jetting first. I thought I was good with the jetting I had and it backed the plugs out a time or two. ended up jumping up like two or three jet sizes before it was were it needed to be.

[finman]

I pulled the plugs and they are a little light brown.

I will double check the jets and buy new plugs and make sure I get them in there pretty snug.

 

Will let you know.

 

Thanks,

 

Finman

[finman]

dont get the plug lock, the plugs backing out is the only thing saving your motor!!!!

you go locking the plugs down and it will blow sky high! check your jetting first. I thought I was good with the jetting I had and it backed the plugs out a time or two. ended up jumping up like two or three jet sizes before it was were it needed to be.

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What recommendations would you have for main jet?

I have no advanced timing, lid off air box, pro design foam filter/cool head, +4 crank, 110 octane fuel, stock carbs, CPI pipes

 

Finman

[FASTOYS]

What kind of porting? Always recommend to ask who ported what jets first!

We have had them from 320 -440 on stock carbs. Depends on the port work.

I would GUESS around 360-380 range should be safe! Always start rich and come down.