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  1. Replies
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    Tech Article : Riblets and your PWC

    Riblet Technology … and your PWC
    On February 4, 1987, skipper Dennis Connor and his ten-man crew guided the Stars and Stripes racing yacht past the finish line at Fremantle, Australia, to recapture...
  2. Tech Article Mikuni 44 Carburetors Part Technical .. Part Tragedy Part 2

    Signal and the G-Test machine

    In the early 1990s, there was growing conversation among R&D engine guys about inlet signal, and how it affected jetting and carburetion…. But what is signal?

    For...
  3. Tech Article : 44Mikuni Carbs – Part Technical …Part Tragedy Part 1

    The 1986 Kawasaki 550 was the first PWC to be equipped with the “round Pump” BN 44mm Mikuni carb. Most Kawasaki shop mechanics were familiar and proficient with the “2 adjuster screw” BN38 Mikunis,...
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    New Tech Articles

    Over the last months, I've written a few general tech articles to post to FB groups ... I figured I should post them here too ... hope y'all find them to be helpful .... I have a few more in the...
  5. Tech Article : About Kaw 440/550 Flywheels

    About Ignition Flywheels - All 440/550 engines came with one of 4 different flywheels … and the difference matters a lot. Three of those flywheels, we refer to as the “interchangeable riveted”...
  6. Tech Article : Kaw 650/750/800 Cooling Upgrade

    We are constantly swamped with Kaw 650/750/800 owners wanting to upgrade their cooling systems (1/2” line … dual water-line, etc). We let them know there is one very simple upgrade that every...
  7. Re: I want a project I just need to know what it will be. KNOWLEDGE please.

    If you are talking 2 strokes.... The GP1200R equipped with a 1390cc Big bore kit has been the most popular (and fastest) 91 octane recreational setup ... 73-75mph..... and it's a good hull in rough...
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    Re: 750sxi pro Factory limited pipe

    We only recommend the FPP Pipe (we do not carry them) ... they are a bit hard to find, but worth the effort.

    Regards, Harry
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    Re: 1996 Sea Doo GTi 717cc motor

    Cliff,
    You are correct that the compression sounds low. Sight unseen, it's hard to offer any exact pricing. It's probably best for us to communicate variables, pricing, etc via my business email...
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    Re: Getting ahold of GroupK

    Twake,
    My apologies that you have not (apparently) gotten a response from us. Since your post here does not have your real name (which we key off of) , nor the model of machine you have, nor the...
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    Re: tigershark avaibility

    We do carry the airleak gauge
    ($39) and rubber sheet to cut block offs ($19).
    Respectfully, Harry Klemm
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    Re: tigershark avaibility

    We are still open ... but at the IJSBA Finals in Lake Havasu this weekend ... we do not have a Tigershark tool kit.
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    Re: what spark plugs?

    With all due respect, there is no spark plug on earth that can net a 19% power increase (even 1.9% increase would be optimistic). Spark plug gap is a function of how much voltage the ignition has...
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    Re: 750 porting options?

    Conk,
    Please know that the Sleeper and 92 octane Hammer porting/head mod specs are the same.... the 105 specs have higher port timings, and compression ratios. If you have a head, we still need to...
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    1,995

    Re: 2008 SXR Better Fuel Economy?

    smd,
    There is no doubt that SuperJets get better fuel range than comparable SXRs. Actually a stock SXR fuel range is not bad. The big problem with the SXR is the dramatic increase in fuel...
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    Re: Can You Re-Cut My Replaceable 787 Domes?

    Matt,
    While it sounds like it should be aneasy machining task .... it's not (long story why). Anyway, I would likely not take on that task.
    Respectfully, Harry Klemm
  17. Re: 61x cylinder max bore, conflicting info on website

    Bored,
    You bring up a good point. On our earlier big bore setups, most customers were building race boats intended for sustained high rpm use. The stock sleeves struggled to have the durability...
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    About V-Force Reeds

    The thread below may be of interest to those running V-Force Reeds.

    Respectfully, Harry Klemm


    http://www.pwctoday.com/showthread.php?t=459913
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    About V-Force Reeds

    We often write tech update bulletins for our customers … it gives me no joy at all to write this one.
    We recently did a full buildup of an SXR800 engine for a customer. While we normally use stock...
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    Re: Carb Boring - Not Impressed!!

    Posts ??? You mean "a" post. Well sea-one .... there is a post like this because it is very easy for anyone to anonymously post anything they like with a "hit and run" post ... and never be...
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    Re: Carb Boring - Not Impressed!!

    Sea-one,
    Please know that all the work at Group K is done by "exactly" the same techs that did the work in 1990. We have had a small number of very sharp techs that have worked at our shop over the...
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    Re: Side draft carbs

    WFO,
    No worries ..... If you got the emails I get on a daily basis, ones like this are (sadly) not unusual .... and they're serious.

    Regards, Harry
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    Re: Side draft carbs

    Not sure if this a joke or not .... sidedraft inlet manifolds and bilge systems are totally unrelated .....??

    Regards, Harry Klemm
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    Re: Sleeper kit seadoo 800

    Ashr8,
    Thank you for the message. Understandably, we do not disclose the specifications of the mods that we sell (no one in the industry does that). That said, the USPS freight for the kit would be...
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    ProX and Wiseco Pistons

    For the majority of our high performance PWC engine packages, we use and recommend Wiseco pistons. The primary reason for this is that the quality of the material of the Wiseco rings offers...
  26. Re: 64.8 MPH Duplicated and beat the GroupK 96xp Rossier pipe setup with 42mm Novi's

    It sounds like you have a very good running XP. The GPS runs might be a bit more relivant if you made them with the scoop grate and sponsons installed (we did) ... but good speed none the less. On...
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    Re: Pro-Tec Half Girdles

    Sorry for the delayed response. After ProTec decided to stop making the half-girdles, we started making them. The cost of the billet brace and all hardware is $169.

    Respectfully, Harry Klemm
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    Re: superstock 440 question for harry

    The plumbing setup on the head was not done by Group K, but it often happened that customers used their own plumbing setups. The only way to know for sure if it is one of ours would be to see some...
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    Re: Wiseco pistons ring gap

    Michele,
    88kawi is correct. There is "setup" ring gap, and "broken-in", or "wear-limit" end gap. As the outer skin of the new rings wears away, the ring endgap will certainly increase .... but it...
  30. Poll: Re: What is the max HP you can get out of a stock sleeved stock stroke 62t/61x engine

    Quinc,
    I do not have dyno HP data on the various setups. That said, boring the stock sleeves to 84mm is fine for recreational use, however if you're planning to do extended high rpm operation, you...
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    Re: Dual 44mm Carbs on Superjet

    Many thanks to those that chined in before I got to the post. In general, we have gotten great results from the dual 44s (from the 760/Blaster2) on the 845 big bores. However on all the smaller...
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    Re: sxr mod recommendations

    Johnny,
    Whoops, sorry I missed your post. The best low-cost mod to help acceleration would be to bore the exit nozzle to 80m ($55).... It only takes a few days.

    Regards, Harry Klemm
  33. Re: Mill stock 787 head with damage to 91 oct. safe specs ?

    Sorry for the delayed response. In 90% of the cases, we can do the head mod, and fix
    most of the damage at the same time. There may be a few remaining small pits, but they have no effect on...
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    Re: Velocity stacks and air intake tuning?

    Quin,
    We have tested with various velocity stack type flame arrestor adaptors. Bottom line .... they all work well, but there were none that were "night & day" better than the rest .... they are...
  35. Thread: SXR 1100 Kits

    by Group K
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    Re: SXR 1100 Kits

    Gray,
    Actually we have done quite a few of these already. For the most part, we are using the specifications that we used for the STX1100 Sleeper kits which were developed with endurance racers of...
  36. Re: Your thoughts on Blowsion destroyers on 800 sxr

    Sadly, we never took the time to do any sponson testing on SXRs, so I don't have any useful input for you.

    Ressectfully, Harry
  37. Re: Cylinder head modification performance improvement

    The head mod for that model offers a significant increase in overall acceleration, and a bit of added peak speed. The mod is 91 octane safe, and requires no jetting change at all.

    Going to...
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    Re: Yamaha 1100 more compression require rejet

    The head gaskets should not be re-used on that model...that may be your problem.

    Harry
  39. Replies
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    Re: Yamaha 1100 more compression require rejet

    Normally, any 91 octane safe compression increase will not require any jetting changes. You stated no CC volume info...What is it??

    Regards, Harry Klemm
  40. Thread: carb work 66v

    by Group K
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    1,347

    Re: carb work 66v

    The photo of the piston crown in the other mail show crown damage that looks like it was caused by debris [like a bearing cage coming appart]... A lower end teardown is in order. I would recommend...
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    Re: Yamaha twins v. triples

    Jim,
    You and your friend are right on target. A single pipe on a twin is amazingly effecient, does a great job of scavanging because of the 180' crank rotation. Sadly, the 120 crank of a triple...
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    Re: how much to rebuild carbs?

    We can do the labor on the Keihins, but we suggest you get oem Keihin rebuild parts.

    Regards, Harry
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    Re: piston to wall clearence on js550

    The cylinder material dictates the clearance .... there is no mid ground.

    Respectfully, Harry
  44. Thread: 701 vibration

    by Group K
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    1,124

    Re: 701 vibration

    To me, the crankshaft would be very suspect .... assuming that engine allignment is perfect.

    Regards, Harry
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    Re: how much to rebuild carbs?

    Scott, Your post doesn't say what carbs.... what engine.... what boat...??

    All that said, I assume they are Mikunis. The labor is $60 per carb, however we use ONLY oem Mikuni rebuild kits ... no...
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