Park plug gap gets smaller after I put it in By jjoshua20213 (Read 467 times)

[jjoshua20213]

Back again... smh

So I gapped (gap was soo small and mpg was worse than a car) the plug and put it back. Then I noticed it was going a little slower, so I firured it was a too big of a gap.(.035)



When I pulled it out it was the same small gap

Why did this happen?





IE: I installed a 100cc 50mm bbk

Enigine is a GY6 139QMB

Same spark plug I bad when I got the scooter (A7TC)

[royldoc]

I'm guessing the piston is hitting the plug. Did you check if the piston sticks out of the cylinder at tdc when the bbk was installed? The plug may be threading to far into the head. You can add another compression ring on the plug.

Roy

[jct842]

or is it the right length plug?

[justbuggin]

i say that the piston is hitting it like royldoc said put one or two more compresion ring on the plug should take care of it

[jjoshua20213]

Thnx, gunna try it, and ill post results

[jjoshua20213]

Also what damage might have occurred if that is the problem?

[Alleyoop]

No damage since the piston is just nipping it. What plug are you using by the way the number on the plug. It may be you have the wrong length plug and is to long and protruding to far into the chamber. Or due to the BBK the piston is moving to far up OR the timing is to RETARDED allowing the piston to travel all the way up before it fires.
Alleyoop

[jjoshua20213]

Same setup, regapped and replaced. Checked it 2 days later. No change... This scooter pisses me off!

But I got a new problem. Gunna start a new forum...smh

[Alleyoop]

What is the number of the plug you have in there? If you do not answer questions how are people supposed to help?
Alleyoop

[jjoshua20213]

Sorry the plug is A7TC

The non resistor type. Same plug that came with it.

I posted the plug type in the initial posting.