Results 1 to 4 of 4
  1. #1

    Join Date
    Jan 2006
    Location
    Lake of the Ozarks
    Posts
    191

    Downside to Big Bore?

    I have set my ski up with just about everything. Now, I am wondering if I should have went/should go to a big bore set up. What is the downside? Thanks.


  2. #2
    flyboy's Avatar
    Join Date
    Nov 2005
    Location
    Destin, FL
    Posts
    1,585
    sell your top end, buy a trashed 1200 top end and go BB.

    It wouldn't be in your best interest to BB your current top end since you can get top dollar for it.

    if you sell your top end and get trashed cylinders, you can do it all for about 400 bucks. that would be a ported 1400.

    drawbacks? hanging on...

  3. #3
    African-American
    Join Date
    Feb 2007
    Location
    Cape Town, South Africa
    Posts
    2,226
    +1
    88
    If he used a 1300 topend, wouldnt he land up with 1500cc (1490) ?

  4. #4
    HopatcongGPR's Avatar
    Join Date
    Feb 2006
    Location
    New Jersey
    Posts
    1,114
    Quote Originally Posted by spaceman View Post
    If he used a 1300 topend, wouldnt he land up with 1500cc (1490) ?

    1200 jugs are adequate for 90's. i have about 10-12 hours on my jugs now with no issues.

    1200 jugs have more transfer port volume then the 1300 jugs.

    either cylinder the bottom of the exhaust port needs to be welded up after being bored. the 1200 jugs ears on the intake side of the skirts should be closed up like the 1300 jugs.

    lowell knows what to do.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Replies: 4
    Last Post: 08-25-2016, 05:51 PM
  2. Not sure whether to do a gprxp conversion or keep the gp1390 lowell big bore
    By daniellib in forum Yamaha PWC Performance (2-stroke)
    Replies: 33
    Last Post: 04-10-2015, 10:51 AM
  3. ? Where to go for best big bore kits ?
    By blasterboy1980 in forum Yamaha PWC Performance (2-stroke)
    Replies: 2
    Last Post: 03-13-2008, 02:49 PM
  4. Best Place To Send Jugs For Big Bore??
    By RDH in forum Yamaha PWC Performance (2-stroke)
    Replies: 31
    Last Post: 06-25-2007, 02:28 PM
  5. To Say 1300 or go 1400 big bore ?
    By kevski in forum Yamaha PWC Performance (2-stroke)
    Replies: 36
    Last Post: 02-18-2007, 03:42 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
  •