Results 1 to 7 of 7
  1. #1

    4 Tech 155 - looks like rust on top of cylinder

    I recently fogged my friends 155 4tec and when we looked down into the spark plug hole, it looks like there is some rust on top of the head. He purchased it at the begging of the season and never had a problem with it. The oil didn't smell of gas, it looked clean, and the level was proper. The spark plugs looked fine as well. Is this a problem?


  2. #2
    SplishSplash's Avatar
    Join Date
    May 2006
    Location
    Belle River Ont Canada
    Posts
    1,445
    +1
    143
    Did the spark plug tubes look ok? Nothing else can rust, as it is aluminium. Might have been copper anti seize that was used on the spark plug threads

  3. #3
    Whatís rusty? The head is aluminum the pistons are aluminum. Do you mean the sleeves?

  4. #4
    Maybe that's all it is. It runs perfect, just glanced down the bore where the spark goes and it looks brown on top of the piston, all 3 look exactly the same. Spark plugs look great. Threads going down in the head looks great. Runs great. just wondered, Makes sense it's not rust after you say it's aluminum. Duhhh me...

  5. #5
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	30770C57-1A2C-499E-99EA-87D73D3C948A.jpg 
Views:	139 
Size:	68.5 KB 
ID:	440790  

  6. #6
    I found this pic This is what it looks like
    Last edited by AdamE; 10-17-2018 at 03:44 PM.

  7. #7

    Join Date
    Aug 2013
    Location
    Waterloo ON
    Posts
    348
    +1
    33
    Likely an inaccurate picture image made by the device you are using

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Replies: 32
    Last Post: 06-20-2014, 10:59 AM
  2. Looks like water on sparkplug 94 sl 750 fuj enginei
    By Djaypro in forum Polaris Open Discussion
    Replies: 15
    Last Post: 08-31-2013, 09:46 AM
  3. Plastics on top of engine are useless and cause rust
    By Gus13letter in forum 4-Tec Performance
    Replies: 7
    Last Post: 07-29-2008, 07:48 PM
  4. How should top of cylinders look?
    By GeoRXT in forum 4-Tec Performance
    Replies: 5
    Last Post: 10-07-2006, 03:41 PM
  5. 03/04 MOTOR- WHAT IT LOOKS LIKE PUT TOGETHER OUT OF THE HULL
    By ABBOTT in forum Yamaha How To & FAQs
    Replies: 6
    Last Post: 01-09-2006, 01:12 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •