GROUP K 845cc SuperJet Freestyle Tech Info

SUPERJET-113

SUPERJET-113

GASKETS FOR CHAMP BRAP!
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Lake Havasu City, AZ USA
#.0 said:
You're right they shouldn't be using a modified stock head with that expensive kit when you can purchase the ADA superbore head shell and no machine work is necessary.

http://www.adaracing.com/personal-watercraft/head-shell-yamaha-super-bore/ya760sb

The custom ADA Sea-Doo 951 domes will work perfect with the 62T cylinder and they can be made by to any specification for 50 dollar charge on top of the dome price.
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Wow, I didnt even know that head shell exsisted from ADA! Thats nice.

After reading this, I called my friend last night and he will going that route for sure.
He already has a ADA head, so he be able to use his studs/nuts on it.
I agree, why buy the machine OEM with the expensive special made gasket. I'm sure I could get that gasket made for me at a fraction of the cost that Harry charges.

Thanks for the tip! Your a wealth of knowlege #.0!
 
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Jr.

Jr.

Standing Tall
Staff member
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Location
Hot-Lanta
I spent a little time looking around tonight & stumbled upon this thread........

I have 5 brand new ADA Super Big Bore girdled headshells to offer up for cheap. Several years ago when I had JrMagoos, I played with & built several of these motors. I had a bunch of headshells made with the JRM logo etched in them...... long story short, I have 5 left....... I will offer them up for $100 each, shipped USA only! (current list is about $195) These are the headshells only, they accept ADA, SD 951 domes only, you will need to have the domes custom cut for the Group K cyl package, but I would guess it will work great, I'm sure Harry will help you with the domes for his cyl.

I have heard great things about this cyl. While I tried this consept, I didn't like certain elements of it. Harry firured out how to make it work.
Kudos Harry!!! I knew there would be a way! You found it!

ski ya, Paul
 
waterfreak

waterfreak

I had a vision!
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Vendor Account
Location
s florida
Jr. said:
I spent a little time looking around tonight & stumbled upon this thread........

I have 5 brand new ADA Super Big Bore girdled headshells to offer up for cheap. Several years ago when I had JrMagoos, I played with & built several of these motors. I had a bunch of headshells made with the JRM logo etched in them...... long story short, I have 5 left....... I will offer them up for $100 each, shipped USA only! (current list is about $195) These are the headshells only, they accept ADA, SD 951 domes only, you will need to have the domes custom cut for the Group K cyl package, but I would guess it will work great, I'm sure Harry will help you with the domes for his cyl.

I have heard great things about this cyl. While I tried this consept, I didn't like certain elements of it. Harry firured out how to make it work.
Kudos Harry!!! I knew there would be a way! You found it!

ski ya, Paul
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you should be able to sell all of those to Harry! It would only compliment is kit

BTW , good to see you back on the boards!
 
SUPERJET-113

SUPERJET-113

GASKETS FOR CHAMP BRAP!
Site Supporter
Location
Lake Havasu City, AZ USA
Ya, he was saying he didnt think any o-ring head would hold. I say BS and would just use some of the Black or blue RTV for assurance like we used to use all the time on the old protec o-ringed non-removable dome heads.
 
waterfreak

waterfreak

I had a vision!
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Vendor Account
Location
s florida
SUPERJET-113 said:
Ya, he was saying he didnt think any o-ring head would hold. I say BS and would just use some of the Black or blue RTV for assurance like we used to use all the time on the old protec o-ringed non-removable dome heads.
Click to expand...

I would say look at all the stroker big bore out there holding out just fine with o-rings!:biggthumpup:
 
Ericfox

Ericfox

Do it twice?That's DooDoo
Location
Akron area --> OHIO!
I am still waiting to see one of these things running... or just hear about it...

last time I heard- some people had ordered them... someone must be already running one of these things...
 
C

clkwrkorg36

Location
south carolina
yes mine is in a blaster. i've never ridden a stroked blaster or superjet, so it would be hard for me to compare. it's like the difference between a 125 2 stroke, and a 450 4stroke.
 
Foximus

Foximus

CFL Cheapass.
Location
Oviedo, Fl
clkwrkorg36 said:
yes mine is in a blaster. i've never ridden a stroked blaster or superjet, so it would be hard for me to compare. it's like the difference between a 125 2 stroke, and a 450 4stroke.
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Uh... Id take the 125 anyday.... I think that was an aweful analogy.


And if thats actually what you meant I think Harry needs to go back to the drawing board.
 
LegDragger64

LegDragger64

X
Im still waiting on some pistons bigger than 86mm for my groupk bigbore. Its bull:):):):) that none are offered since there is plenty of sleeve thickness left. There must be coumtless others with bigbore topends that would also run bigger pistons if they were available.
 
Polish jet pilot

Polish jet pilot

4aces4aces4aces4aces4aces
Location
Warsaw, Poland
So still no definite answer how that kit performs? How about Group K say something about it? Maybe some performance specs? e.g. take a standard SJ and a SJ Group K and make a few simple tests...
 
kevbo

kevbo

Location
dfw
Polish jet pilot said:
So still no definite answer how that kit performs? How about Group K say something about it? Maybe some performance specs? e.g. take a standard SJ and a SJ Group K and make a few simple tests...
Click to expand...

The only objective tests come from a dyno or radar, everything else is someones BS. You will not be seeing any hard numbers on these oversized engines because their power doesn't increase much with size. GroupK has discovered, jetskiers are all about size. They will spend a lot of money if its bigger without regard to cost/benefit.
 
BBYamaha

BBYamaha

Location
San Antonio
kevbo said:
The only objective tests come from a dyno or radar, everything else is someones BS. You will not be seeing any hard numbers on these oversized engines because their power doesn't increase much with size. GroupK has discovered, jetskiers are all about size. They will spend a lot of money if its bigger without regard to cost/benefit.
Click to expand...


Thats kind of a bold statement... 2k is not a lot of money for a motor...
 
masterblaster

masterblaster

X-H2
it might be more torque than a 701 but there is no way its as much diff as a 125 to 250 motox bike. they would have to be 950 or bigger to feel like that much diff
 
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