Plug thread size different on same engine
#1
Plug thread size different on same engine
I have a 2003 1200 custom sportster. When I started to check spark plugs I found one plug was a larger thread and the plugs were different. I'm new to Harley's but I'm almost positive this isn't the way it should be. Has anybody seen this before? If so what can be done to correct this problem besides buying a new head?
#2
I have a 2003 1200 custom sportster. When I started to check spark plugs I found one plug was a larger thread and the plugs were different. I'm new to Harley's but I'm almost positive this isn't the way it should be. Has anybody seen this before? If so what can be done to correct this problem besides buying a new head?
There are tread repair inserts like helicoil and time sert, or you could have the head welded and re cut, or strip the other and drill it larger.
That Or ride it, that would not bother me at all.
#3
#5
#6
Not knowing what size your cyl head has been oversized to, I would find the correct insert to reduce the thread back to factory size, 12mm I believe.
The kits can get expensive. so for a one time job you might seek out a local shop that could do the repair. Might be cheaper in the long run.
This is a sample of the repair kits
http://www.timesert.com/html/sparkplug.html
The kits can get expensive. so for a one time job you might seek out a local shop that could do the repair. Might be cheaper in the long run.
This is a sample of the repair kits
http://www.timesert.com/html/sparkplug.html
#7
Stock plugs are champion, I would find a supplier that sold them and ask them to get the same heat range resistance etc, in the different thread size.
Stock is RA8HC.
What is in there now?
Stock is RA8HC.
What is in there now?
Last edited by Harleycruiser; 06-11-2015 at 08:52 PM.
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