User Tag List

Page 1 of 5 1 2 3 4 5 LastLast
Results 1 to 15 of 65
  1. #1
    Join Date
    Jun 2018
    Location
    Floating around
    Posts
    2,866
    Thanks (Given)
    292
    Thanks (Received)
    265
    Likes (Given)
    1958
    Likes (Received)
    1567
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    98 200FF build, lots of pics. lots of questions, hopefully not lots of mistakes!

    Gents all input is welcome and encouraged. This is my first Merc build so I'll need guidance here. I dont have a manual for this motor im running on instinct so far but the tear down is the easy part.

    While my helper is off I decided to get the motor side of my boat build equation rolling. If you havent seen my boat build thread I'll link it below this motor is going on a 79 Viking. I bought this motor initially for my Valero I had at the time and ended up buying the boat with this motor and now im restoring another hull for it. This motor is in excellent physical condition and ran great but ever so unfortunately that was short lived. The fuel line was pinched in between the cowl and pan so it leaned out and dropped compression in hole#2 to 30psi and hole#5 to 120psi. The rest all remained at 135. Time to rebuild and up the power while we are at it. Goal is a lake motor that has all the legs I'll need. Im sticking with the 40amp and hope I can spin it occasionally to 8000RPM but that wont be often. Build plan so far is as follows


    1. clean up the rod slots
    2. open up the exhaust slots and the downspout a little
    3. Upgrade reeds
    4. Fill oil injection void
    5. Bore it, New pistons and rod bolts
    6. Add brucato
    7. Run it

    My first questions are;

    1. This motor has 4 petal reeds in it so is it worthwhile to upgrade this or should I replace with a bigger/better set up? Somehow I was expecting five petal
    2. What should I be checking over and upgrading while im in here? Any known gremlins? spots to look over for casting issues or weak spots etc?



    View from the back minus heads and cover. Top left hole is 30psi and bottom right is 120. Both are scuffed
    Click image for larger version. 

Name:	2.5L_1.jpg 
Views:	62 
Size:	423.5 KB 
ID:	490542

    Cylinder 2. Notice the sleeve vs the casting, wow thats some poor fit and finish there
    Click image for larger version. 

Name:	2.5L_2.jpg 
Views:	95 
Size:	431.9 KB 
ID:	490543

    Click image for larger version. 

Name:	2.5L_3.jpg 
Views:	72 
Size:	421.5 KB 
ID:	490544


    Cylinder 5
    Click image for larger version. 

Name:	2.5L_4.jpg 
Views:	55 
Size:	422.0 KB 
ID:	490545


    Exhaust side of cylinder 2 you can see its pretty grey
    Click image for larger version. 

Name:	2.5L_5.jpg 
Views:	77 
Size:	432.9 KB 
ID:	490546


    Cylinder head from the even side. The only one that was grey the other side looks fine
    Click image for larger version. 

Name:	2.5L_6.jpg 
Views:	63 
Size:	428.8 KB 
ID:	490547


    Looking down the exit the alignment isn't too bad. There will be lots of smoothing and clean up going on in here
    Click image for larger version. 

Name:	2.5L_7.jpg 
Views:	82 
Size:	430.6 KB 
ID:	490548








    This is my boat build thread

    https://www.screamandfly.com/showthr...9-Viking-build


    Fire away im all eyes
    Hydrostream dreamin

  2. Likes tnelsmn liked this post
  3. #2
    Join Date
    Aug 2006
    Location
    GA
    Posts
    799
    Thanks (Given)
    1
    Thanks (Received)
    16
    Likes (Given)
    23
    Likes (Received)
    56
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Mota had the chitt run out of it

  4. #3
    Join Date
    Jul 2012
    Location
    Lufkin, Texas
    Posts
    2,627
    Thanks (Given)
    299
    Thanks (Received)
    270
    Likes (Given)
    1785
    Likes (Received)
    1242
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    1. Call Jay Smith and have him send you some TDR reeds.

    2. Top pinned pistons are good peace of mind if you're planning to zing it to 8k. Also get the metal caged rod bearings, 514R (IIRC) from Pro Marine.
    Josh Peterson

  5. Thanks LakeFever thanked for this post
    Likes LakeFever liked this post
  6. #4
    Join Date
    Jun 2018
    Location
    Floating around
    Posts
    2,866
    Thanks (Given)
    292
    Thanks (Received)
    265
    Likes (Given)
    1958
    Likes (Received)
    1567
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I read a ton of threads last night about the 4 petal reeds and it seems they are decent for my purpose so I think I’m going to run them. The 8000rpm target is not set in stone but I definitely want to go over 7000 so that’s the range 7-8000 rpm type thing. Will the 4 petal support that? What exactly is top pinning pistons? Any pics to show the difference I searched and came up with nada
    Last edited by LakeFever; 07-18-2021 at 06:18 AM.
    Hydrostream dreamin

  7. #5
    Join Date
    Jul 2012
    Location
    Lufkin, Texas
    Posts
    2,627
    Thanks (Given)
    299
    Thanks (Received)
    270
    Likes (Given)
    1785
    Likes (Received)
    1242
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have had the standard 5 petal cages over 8k on a 2.0, never ran a 2.5 that hard so who knows? The extra displacement may tax the cages harder. As for top pinning the pistons:

    http://us1.cc/weldedtoppinpistons.html


    John Marles is the one who handles that.
    Josh Peterson

  8. Thanks LakeFever thanked for this post
    Likes LakeFever liked this post
  9. #6
    Join Date
    Jul 2006
    Location
    Minneapolis MN
    Posts
    821
    Thanks (Given)
    162
    Thanks (Received)
    102
    Likes (Given)
    2344
    Likes (Received)
    860
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Subscribed so I can follow along.

  10. Likes LakeFever liked this post
  11. #7
    Join Date
    Jun 2018
    Location
    Floating around
    Posts
    2,866
    Thanks (Given)
    292
    Thanks (Received)
    265
    Likes (Given)
    1958
    Likes (Received)
    1567
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I think im just gonna stick with the 4 petal and see how it goes because i have it and its easy to upgrade later if I dont feel its enough. I'll be updating with some more pics soon as I get the case split
    Hydrostream dreamin

  12. #8
    Join Date
    Jun 2014
    Location
    South Carolina
    Posts
    152
    Thanks (Given)
    28
    Thanks (Received)
    13
    Likes (Given)
    52
    Likes (Received)
    51
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I been tinkering with a 98 200 EFI, started a dummy and now an experienced dummy thanks to S&F and trial & error. here's some thoughts,,
    --make sure fuel tank pickup, venting & filter are all proper & high flow
    --do all peripherals while it's on the bench with added power it's gonna seek out weak point after weak point... Bleed system refresh, new crank case end seals, all new gaskets on front end and in exhaust plates, diaphragm pump rebuild and vst clean (vst housing oring not reusable it will pinch and leak, pony up $50) Injectors flowed. New CDI voltage regulators.. protect your electrics
    ---don't mod cooling it just cooks exhaust plate gaskets and runs inconsistent, keep stock cooling with T stats.
    -- ccms stuffers add nice mid range punch
    -- ccms head stud kit,.. you're gonna be pulling heads numerous times inevitably
    -- i don't see cut heads on your list but that's another nice adder, & advance the timing to match added compression.

    Hope this helps & will follow your build

  13. Thanks LakeFever thanked for this post
    Likes LakeFever, rgsauger liked this post
  14. #9
    Join Date
    Jun 2018
    Location
    Floating around
    Posts
    2,866
    Thanks (Given)
    292
    Thanks (Received)
    265
    Likes (Given)
    1958
    Likes (Received)
    1567
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Solid info I appreciate the guidance. I wasn't planning on head studs until I read that but I am now. Wondering about o-ring heads actually maybe thats also worthwhile? I hadn't considered new regulators either but I will now. I may even try two builds, first one mild then go wild, simply out of fear of dialing the tuning. I've burned down my share of two strokes...
    Hydrostream dreamin

  15. #10
    Join Date
    Jun 2014
    Location
    South Carolina
    Posts
    152
    Thanks (Given)
    28
    Thanks (Received)
    13
    Likes (Given)
    52
    Likes (Received)
    51
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    For your reference, heres my current setup.. Its mild/reliable for all day lake, and it rips too
    Refresh all peripherals like above
    Delete idle stabilizer & oil modules, run stock ecm & 40 amp
    Stuffers, reeds, 34 cc heads, studs, linc n sync, 24 degree timing, promax exhaust divider, 92/3 octane

  16. Thanks LakeFever thanked for this post
    Likes LakeFever liked this post
  17. #11
    Join Date
    Jun 2018
    Location
    Floating around
    Posts
    2,866
    Thanks (Given)
    292
    Thanks (Received)
    265
    Likes (Given)
    1958
    Likes (Received)
    1567
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Stock ECM! Now your talking and Im getting excited! Thats my biggest worry is dialing in the tune up so I might copy that set up for this first one. How high does yours spin to with the stock ECM?
    Hydrostream dreamin

  18. #12
    Join Date
    Jun 2014
    Location
    South Carolina
    Posts
    152
    Thanks (Given)
    28
    Thanks (Received)
    13
    Likes (Given)
    52
    Likes (Received)
    51
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I can't wind mine up due to plastic cages yet to be swapped out + hull gets squirrelly at 70mph...
    That said I have glanced 6300rpm, with throttle remaining

  19. Thanks LakeFever thanked for this post
    Likes LakeFever liked this post
  20. #13
    Join Date
    Jun 2018
    Location
    Floating around
    Posts
    2,866
    Thanks (Given)
    292
    Thanks (Received)
    265
    Likes (Given)
    1958
    Likes (Received)
    1567
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Worth a try I think I'll give it a crack and see how high it will go. Do some plug reading and hope for the best at first. Plan now looks like

    rod slots
    stuffers and reeds
    chest smoothing
    open up dump to XR2 size
    fresh bore, pistons and rod bolts
    steel cage bearings
    epoxy oil injection groove and hole and crankcase as per Forbesauto pics
    34CC heads
    head studs
    ditch black boxes
    lync/synch 24 degrees timing
    all new gaskets seals etc
    clean and flow injectors
    freshen fuel system
    new plugs/wires
    fresh regs
    STOCK ECU

    Appreciate all the input gents keep it coming
    Hydrostream dreamin

  21. Likes NeedOne, tnelsmn liked this post
  22. #14
    Join Date
    May 2016
    Location
    keys
    Posts
    795
    Thanks (Given)
    31
    Thanks (Received)
    42
    Likes (Given)
    254
    Likes (Received)
    419
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Index your flywheel then set timing from most advanced cylinder. I think you can go 25 or 26 degrees safely. Don't take my word on that. But I'm pretty sure i have mine more than 24
    ANTI40​It's just an idea.

  23. Thanks LakeFever thanked for this post
    Likes LakeFever liked this post
  24. #15
    Join Date
    Jun 2014
    Location
    South Carolina
    Posts
    152
    Thanks (Given)
    28
    Thanks (Received)
    13
    Likes (Given)
    52
    Likes (Received)
    51
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    One other expense.. TPS test harness - major part of tuning it to run sweet.

  25. Thanks LakeFever thanked for this post
    Likes LakeFever liked this post
Page 1 of 5 1 2 3 4 5 LastLast

Similar Threads

  1. Totally new to Jet Boating, Lots of questions
    By iloveitloud in forum The Scream And Fly Lounge
    Replies: 0
    Last Post: 06-20-2010, 08:29 PM
  2. Need lots of race pics, Please!
    By Alan Power in forum General Boating Discussion
    Replies: 11
    Last Post: 10-20-2005, 02:33 PM
  3. OMC gurus lots of questions
    By BASSIN in forum Technical Discussion
    Replies: 24
    Last Post: 11-02-2004, 08:55 AM
  4. Build it light,Add lots of HP
    By Sharkey-Images in forum Technical Discussion
    Replies: 2
    Last Post: 07-29-2001, 09:08 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
  •  
Frank Mole Transport