Results 1 to 1 of 1
  1. #1

    08 VX110 newbie Valves question with pics

    Took my first 4 stroke apart today. The problem this one has is zero compression on #2. I pulled the cam shafts and head and this is what I found.The photo is with the #1 cylinder at TDC. All of the #1 valves look closed...and I suspect this is correct since it is TDC.Aon #2 cylinder, the 3 intake valves look wide open but the front most exhaust valve is closed and the rear exhaust valve is wide open. I suspect this is my problem.On cylinders 3 and 4, the intake valves look firmly seated but the exhaust valves are slightly open. Is that mormal? The first photo shows the #2 cylinder with one exhaust open and one closed while the #1 cylinder is at Top Dead Center (determined by feeling for pressure being forced into #1 while turning the PTO counter clockwise, then inserting a screwdriver into the plug hole and slowly continuing the rotation till it peaked. Marked the chain and the cam shaft sprockets for reassembly. The second photo is a photo from a steep angle showing some rust behind the valve heads. There is actually rust on some of the other cylinders valves as well.The third photo is a shot of the cylinders. Besides the color difference, the piston heads look perfect and the cylinder walls of #2 look flawless.The question I have is does this look like there are enough issues with this head to warrant just ordering a head exchange from SBT? Dealer pricing on it through a I think around $400 total if I take that route.The intent of this motor is to get it healthy, water test it for a bit and then throw it into a 2Stroke SUV for my first conversion. I wanted to learn the motkr befor doing so though. If it becomes too much of a PITA then WFO will likely grab this project for me when he gets time to play with it. In the meanwhile....what am I looking at? This is my first ever 4 stroke. Didnt even know what a cam was a week ago LOL!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	20131203_192657.jpg 
Views:	87 
Size:	78.0 KB 
ID:	319384   Click image for larger version. 

Name:	20131203_225551.jpg 
Views:	86 
Size:	72.6 KB 
ID:	319385   Click image for larger version. 

Name:	20131203_193227.jpg 
Views:	128 
Size:	128.0 KB 
ID:	319386  

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Yamaha vx110 broken valve question? (pics
    By Turbofab in forum Yamaha PWC Performance (4-stroke)
    Replies: 7
    Last Post: 07-24-2013, 05:32 PM
  2. 2 questions with pics for '94 GTS
    By Paul2112 in forum 2-Stroke Performance
    Replies: 1
    Last Post: 07-23-2013, 09:09 PM
  3. Carb Questions with PICS!!!
    By Tatback in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 11-16-2011, 12:06 AM
  4. 2001 gp1200r drive shaft question with pic
    By SUBLIME808 in forum Yamaha PWC Performance (2-stroke)
    Replies: 2
    Last Post: 04-07-2011, 02:59 AM
  5. 160mm Wear Ring Question with Pics
    By 1 FAST VE in forum Yamaha PWC Performance (4-stroke)
    Replies: 6
    Last Post: 06-12-2010, 12:31 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