Thread: Comments On Piston Wash
12-12-2007, 03:13 PM #1
Comments On Piston Wash
Check out these 3 pics and let me know what you think. The wash is a little redish color but that's just the camera/lighting. There is nothing that even looks anything like rust on the inside...lol Also, around the edges of the pistons there is no damage. I wiped the top of the piston off with a towel right before I took the pics, so there is some oil around the edges.
Let me know what you see. The first is the pto, then the middle then the mag. Oh, best to install a new head gasket dry? right?
Last edited by DrewNJ; 12-12-2007 at 03:18 PM.
12-12-2007, 04:28 PM #2
They all look a little lean to my liking. How many hours? How do the plugs look?
12-12-2007, 04:36 PM #3
about 25 hours. Plugs looked good.
Think I skewed it a bit by wiping the tops of the pistons?
12-12-2007, 04:45 PM #4
Been doing my homework (searching) and I guess I was looking at piston wash backwards. Dirty lookin piston tends to look lean where as a cleaner piston tends to be rich....to an extent?
Anyone have some lean to rich to perfect looking pics of wash?
12-12-2007, 05:01 PM #5
12-12-2007, 05:07 PM #6
12-12-2007, 06:24 PM #7
Number 3 is on the hot side, number 1 is better but still a little hot. Much hotter then I run on either of my boats.
What is your jetting?
12-12-2007, 06:35 PM #8
Looks to be on the edge to me, I would fatten it up a bit to be safe.
12-12-2007, 07:30 PM #9
Duke, I don't know what the jetting is. I just got the ski. It's a basically stock motor with the exception of a Groupk BB. I'm pretty sure the carbs and jetting was done by Groupk.
I pulled the head because I wanted to go back to the stock 3 layer head gasket to be safe. The other gasket had the middle layer removed.
The 2 things that are going to change on the ski for me are that the ski will now be running at sea level vs. 800 ft. above. I'm also putting on some outerwears. Not sure if either one of those will make any significant change as 800ft isn't much and the outerwears don't restrict much more than without them...
Do you guys think starting with a 1/2 turn on the highs will work? or do I need to go up a size on the jet?
12-12-2007, 08:06 PM #10
Look a bit lean for what I like. Definitely fatten it up a bit.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By addicted in forum Yamaha PWC Performance (2-stroke)Replies: 104Last Post: 04-28-2013, 10:47 PM
By addicted in forum Polaris How To & FAQsReplies: 0Last Post: 08-23-2006, 06:44 PM
By mtrager in forum Yamaha Open DiscussionReplies: 5Last Post: 05-11-2006, 07:37 PM
By mtrager in forum Yamaha PWC Performance (2-stroke)Replies: 5Last Post: 05-04-2006, 02:53 PM
By Hydrotoys in forum Yamaha Open DiscussionReplies: 7Last Post: 01-13-2006, 06:38 PM