Posts
36
Joined
4/23/2017
Location
Yacolt, WA
US
the 72nd goon
9/16/2017 6:40pm
9/16/2017 6:40pm
Edited Date/Time
9/19/2017 3:13am
Kx 144 piston after 4 hrs. The jagged thing u see on the top of the piston is the spark plug tip.
The Shop
People moan about the cost of the oem spark plug on the rm125, but it's well worth using it on any 125 imo since it resist the ground strap coming off .
That said, that bike had major problems before the plug let go.
The head must be recut to match the oversized piston and create the correct squish clearance. You will also need to be sure to use the correct spark plug for that bike and not a knock off or cross referenced spark plug to be as sure as you can that the plug tip will not break again.
You will also need to do a leak test and a vacuum test to be sure you are not creating a lean condition.
Your jetting will also need to be checked and corrected as it looks to be running lean.
These 144 kits are not just a drop in and go item. They do work great when set up correctly.
Paw Paw
Otherwise, probably detonation.
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