I'm finally asking it...

Foximus

Foximus

CFL Cheapass.
Location
Oviedo, Fl
After trying my tim judge 701 motor in both a superjet and my 550 (obviously there is a huge weight difference) I would have to say unless your running a huge power motor, (like a stroker or a really done up big bore) the 140mm kawi pump is a better hitter than the 144 pump. Throw a TBM in and I think its even better. I feel my 650 pump hooks and reacts far quicker, and with more firm thrust than my squarenose ever did. But maybe my memory has faded over the last few months...


Though I have no idea if this has any pertinence in surf riding as I only ride lakes and rivers.
 
CARBONX2

CARBONX2

Location
South Africa
Grind out flange side of exhaust port to 46-47mm(limited by waterjacket), use adapterplate and fit yami exh, the area at the flange side of a yami is equal to 48mm. It doesn't help having the better reedvalves of the kawi if you are restricted on the outlet.
 
Waternut

Waternut

Customizing addict
Location
Macon, GA
CARBONX2 said:
Grind out flange side of exhaust port to 46-47mm(limited by waterjacket), use adapterplate and fit yami exh, the area at the flange side of a yami is equal to 48mm. It doesn't help having the better reedvalves of the kawi if you are restricted on the outlet.
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I'm confused... are you saying basically shave the kawi's exhaust manifolds mounting surface on the cylinder so it can be opened up more? If that's the case, why would an adapter plate be necessary at all?
 
CARBONX2

CARBONX2

Location
South Africa
jfw432 said:
I'm confused... are you saying basically shave the kawi's exhaust manifolds mounting surface on the cylinder so it can be opened up more? If that's the case, why would an adapter plate be necessary at all?
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Don't know if shaving will give more meat to work with
Port out the flange side to 46mm, use adapter to fit yami exhaust as they have bigger internal diameters than kawi exhausts, no use porting then restricting the motor with a pipe that is too small
 
Waternut

Waternut

Customizing addict
Location
Macon, GA
CARBONX2 said:
Closer than you think
Yami = 118mm
Kawi = 120mm
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:thinkerg: This is going to sound ghetto fabulous but hear me out... I'm doubting that the wrist pins have 1mm (0.039") of play. So would custom pistons be necessary or could a machine shop carefully shave the inside of the piston and a washer be added to make up the difference?
 
Waternut

Waternut

Customizing addict
Location
Macon, GA
Couldn't get all the measurements I wanted from the 750 crank without ripping apart a perfectly good engine so I've abandoned the thought until the right oppurtunity presents itself.
 
jetski9010

jetski9010

Team RTYD
Location
Lancaster PA
Waternut said:
Couldn't get all the measurements I wanted from the 750 crank without ripping apart a perfectly good engine so I've abandoned the thought until the right oppurtunity presents itself.
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why dont u just get done the big bore 849 done to it. Wouldnt that give you more power for less work? Also they resleeve it so I would hope that would lower port timing.
 
Waternut

Waternut

Customizing addict
Location
Macon, GA
jetski9010 said:
why dont u just get done the big bore 849 done to it. Wouldnt that give you more power for less work? Also they resleeve it so I would hope that would lower port timing.
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If you're talking about the GroupK big bore then I've got 1780 reasons... That's a lot of money to drop on basically a stock cylinder especially when I've never ridden a ski with that engine before.

I have given the 66e a lot of consideration though. I'd probably go that route if I ever decide to do an engine upgrade.
 
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