Pre-Order Komodo Dragon drop in conversion piston 372xp to 390xp

Pre-Order Komodo Dragon drop in conversion piston 372xp to 390xpThis is the redesigned, badass replacement for the miserable failure of a piston, The Chameleon. With help from others, Mark created this to actually allow the use of a 372xp crankcase and bottom end with a 390xp cylinder. There is of course fitment work to be done to allow everything to bolt up properly and any porting work you wish to do is up to you, but this is the solution to the "86er" as he calls it. Check out his videos on the origin of this

This is the redesigned, badass replacement for the miserable failure of a piston, The Chameleon.  With help from others, Mark created this to actually allow the use of a 372xp crankcase and bottom end with a 390xp cylinder.  There is of course fitment work to be done to allow everything to bolt up properly and any porting work you wish to do is up to you, but this is the solution to the "86er" as he calls it.

Check out his videos on the origin of this design on his YouTube channel here:

https://youtu.be/YcpZ-IkTp-Msi=JoAY2BOOS6SKNrYl

https://youtu.be/tRThfyG0urAsi=SsjBgBtBFq6EBiuX

https://youtu.be/Nk7YLc_SN-4?si=yuTFj7DT220TuX3B

This model will use the standard 372xp crankshaft.

Design specs were submitted to Wiseco on March 23rd, 2026.

Updates will be posted here as we get them from Wiseco, including anticipated weight.

This design uses a tapered OEM Stihl piston Pin (the lightest and strongest available), a 1mm Japanese NPR ring and Wiseco circlips.  The ring and circlips are included, the pin is NOT, but can be ordered from us separately if needed.

Full Price:   $188.45

Pre-order Deposit: $25.00

Balance:  $163.45 +$5 US shipping.

How it works - you order and pay the deposit for each piston you intend to buy ($25), when we get the design print and specs from Wiseco they will be posted here.  The number of pre-orders will let us know if we need to increase our order size before they fulfill the order.  When Wiseco fulfills the order, we will send each of the pre-order customers an update email which will also request the balance-due.  Pistons will be shipped to you within a couple of days of final payment (the “couple of days” time delay will allow for actual delivery from Wiseco and final inspection by our team).  If we work the timing right, you should be able to watch the next series of videos on the Dragon Build with your freshly forged piston in hand.

USA shipping will be a flat rate $5 on the Balance, no shipping on the pre-order.  I will figure out a price on the Canada shipping as time gets closer but it will be similarly inexpensive.  For any other non US/Canada customers, send me an e-mail to [email protected]. and we will try to get you figured out, I will not be allowing open international orders.  please do not wait to the last minute for international requests, so I have time to create a specific listing for you with a good shipping price.

please note: Pokemon card not included