How to remove carbon deposits from engine - Seadoo Forums

for 15% off all Hydro Turf - CODE: HYDRO15
Need OEM parts for your boat or PWC? Visit
Results 1 to 1 of 1
    Senior Member johnhibbs's Avatar
    Join Date
    Jul 2009
    San Diego
    SeaDoo Challenger 2000, year 2001, 240 EFI
    Thumbs Up
    Received: 1 Given: 0

    Default How to remove carbon deposits from engine

    A lot of people know about Seafoam for treating the engine but have you heard about STIHL engine de-carbonizer (EDTA is the main chemical ingredient)? When I was putting a new head gasket on my M2 I tried some Seafoam to see if it would disolve the carbon on the piston heads. It didn't do anything to the carbon. I guess I'm not convinced Seafoam does all that much but a lot of people swear by it.

    Recently I pulled the spark plugs and spayed some EDTA into the cylinders and let it stand for a couple of weeks. I rotated the flywheel several times by hand to get it spread around. At the same time I soaked the spark plugs in some of the stuff to see what it would do. I placed them in a zip lock bag with the stuff.

    When I checked back a week later all of the carbon was gone from the spark plugs. The clear EDTA liquid had turned a reddish color. When I rotated the flywheel the same reddish color liquid came out of the spark plug sockets. I can't say for sure but I would guess that the inside of my engine is free of carbon.

    Since I don't have anything better to do I did it twice. The first time a ton of smoke poured out of the exhaust. I decided why not do it again since the first time it seemed to do something. The second time I waited about 2 weeks for the stuff to do its thing.
    This time when I rotated to flywheel to get the stuff out before installing the plugs back I didn't notice any red liquid. Maybe once is enough. Something interesting though. No smoke. Usually when I run the boat on the hose I get smoke. Even after when I turn the boat off smoke usually comes out the back for a while. This time nothing. No smoke. Maybe the engine is like new and zero carbon.

    I need to run it on the hose a few more time before I'm convince the smoke is gone.
    Last edited by johnhibbs; 04-20-11 at 01:02 AM.

    0 Not allowed!

  2. # ADS

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. *Help* Went to remove oil from engine when...
    By mmbltcsw1 in forum 2-Stroke Sea-Doo PWC forum
    Replies: 3
    Last Post: 11-01-10, 10:06 PM
  2. How to remove oil pump gear from engine on a 96 gsx
    By JETSKILEE in forum 2-Stroke Sea-Doo PWC forum
    Replies: 1
    Last Post: 09-26-10, 09:41 PM
  3. Remove engine - jet pump
    By RogerC in forum 2-Stroke Sea-Doo PWC forum
    Replies: 4
    Last Post: 03-19-10, 10:56 PM
  4. ATM Carbon fiber engine cover / hood Sea Doo XP / XPL
    By enafzige in forum Buy/Sell/Trade Sea-Doo Related
    Replies: 5
    Last Post: 06-03-09, 02:55 PM
  5. About to remove engine in speedster HELP
    By wittock08 in forum 2-Stroke SeaDoo Sport Boat Forum
    Replies: 2
    Last Post: 04-04-09, 08:25 PM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Register forum what's new