Harry Klemm - GroupK
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Threads 1 to 30 of 761

Forum: Harry Klemm - GroupK

PWC advice, by Harry Klemm, Owner of GroupK, a professional aftermarket high performance Jetski shop

  1. Exhaust jetting kit

    Started by 03Stxdi, 08-11-2010 10:26 PM
    • Replies: 1
    • Views: 982
    08-12-2010, 12:11 PM Go to last post
  2. Deck Hight

    Started by 03Stxdi, 11-11-2010 02:04 PM
    • Replies: 1
    • Views: 791
    12-21-2010, 12:58 PM Go to last post
  3. 1100 stx di exhaust pluming kit

    Started by 03Stxdi, 09-14-2014 09:39 AM
    • Replies: 0
    • Views: 1,943
    09-14-2014, 09:39 AM Go to last post
  4. westcoast impellers

    Started by 10mm, 10-24-2009 09:42 PM
    2 Pages
    1 2
    • Replies: 12
    • Views: 2,805
    11-13-2009, 03:25 PM Go to last post
  5. ? About GP1200 sleeper mod

    Started by 111toybox, 10-25-2010 01:17 AM
    • Replies: 3
    • Views: 1,267
    10-28-2010, 12:13 PM Go to last post
  6. 2001 ultra 130 di opinion

    Started by 123456, 01-14-2011 01:05 PM
    • Replies: 1
    • Views: 884
    02-20-2011, 11:06 PM Go to last post
    • Replies: 19
    • Views: 11,839
    10-21-2014, 11:51 AM Go to last post
    • Replies: 4
    • Views: 2,611
    08-04-2006, 11:27 PM Go to last post
  7. Harry, Hows the 97 xp coming????

    Started by 427racing, 04-18-2006 10:58 PM
    • Replies: 2
    • Views: 802
    04-20-2006, 03:04 PM Go to last post
  8. Lime Green Head

    Started by 486x, 05-07-2009 03:02 PM
    • Replies: 4
    • Views: 1,146
    07-04-2009, 05:51 PM Go to last post
  9. 1996 xp 800

    Started by 550 standup kid, 08-28-2015 05:24 AM
    • Replies: 1
    • Views: 2,287
    08-28-2015, 03:30 PM Go to last post
  10. 750 PJS head damage... can it be re-cut?

    Started by 550/440, 02-03-2010 02:37 AM
    • Replies: 5
    • Views: 1,501
    02-05-2010, 07:32 AM Go to last post
  11. piston size

    Started by 550riverrat, 04-13-2009 08:32 PM
    • Replies: 4
    • Views: 1,789
    04-21-2009, 11:55 PM Go to last post
  12. Any history on this ski?

    Started by 550Rush, 05-20-2017 11:59 PM
    • Replies: 3
    • Views: 2,368
    05-21-2017, 09:32 PM Go to last post
  13. Timing Advance Lesson - STX-15F

    Started by 785xp, 11-12-2006 07:17 PM
    • Replies: 5
    • Views: 1,593
    03-16-2007, 01:06 PM Go to last post
  14. GroupK Seadoo Exhaust plumbing kit

    Started by 785xp, 04-05-2008 11:48 AM
    • Replies: 2
    • Views: 1,100
    04-14-2008, 11:30 PM Go to last post
  15. Motor Build

    Started by 90sJ, 08-15-2008 11:49 PM
    • Replies: 0
    • Views: 1,041
    08-15-2008, 11:49 PM Go to last post
  16. 650 to 701 Carb ???s

    Started by 91superjet, 09-23-2008 06:06 PM
    • Replies: 2
    • Views: 1,132
    09-26-2008, 11:09 PM Go to last post
  17. turn around time for 701 upgrade

    Started by 91superjet, 02-15-2009 06:05 PM
    • Replies: 3
    • Views: 1,404
    03-09-2009, 01:27 PM Go to last post
  18. Bought used ski, how can I tell if group K parts?

    Started by 94gts, 10-20-2009 06:31 PM
    • Replies: 2
    • Views: 1,208
    10-26-2009, 06:15 PM Go to last post
  19. Sudco dual 42s 750 jetting advice..

    Started by 97superjet, 01-19-2012 07:07 PM
    • Replies: 0
    • Views: 634
    01-19-2012, 07:07 PM Go to last post
    • Replies: 8
    • Views: 2,096
    01-31-2013, 07:17 PM Go to last post
  20. 1390 Big Bore

    Started by a1965gt, 01-05-2006 11:04 PM
    • Replies: 3
    • Views: 1,233
    01-06-2006, 02:00 PM Go to last post
  21. Thermal Coating on Pistons/Domes

    Started by a1965gt, 05-07-2006 02:11 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 1,890
    05-10-2006, 02:29 AM Go to last post
  22. Wave Blaster Big Bore

    Started by a1965gt, 08-11-2006 05:26 PM
    • Replies: 1
    • Views: 918
    08-31-2006, 01:38 PM Go to last post
  23. dear sir

    Started by AC 46, 05-09-2011 08:55 PM
    • Replies: 2
    • Views: 1,111
    05-13-2011, 03:14 PM Go to last post
  24. Yamaha superjet options

    Started by accbr, 11-15-2006 09:25 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,207
    11-18-2006, 03:21 PM Go to last post
  25. 61x head question

    Started by accbr, 02-27-2006 12:28 PM
    • Replies: 1
    • Views: 997
    02-27-2006, 12:46 PM Go to last post
  26. 750 Kawasaki head on 650 engine?

    Started by adamrs80, 03-21-2007 11:03 PM
    2 Pages
    1 2
    • Replies: 10
    • Views: 2,834
    03-22-2007, 09:43 PM Go to last post

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