Super Jet what´s wrong with my ski?

S

sniper

Location
sweden
I have a wamilton pro hull and a stock stroke dasa pv 771cc engine, dual 49 full specs and atp flame ignition a oem pump and a 10/16 hooker thats fine.........BUT when I tried my friends ski a 720cc engine ported by himself I think it was oem carburators and maybe an enhancer, it hit way much better than mine...whats up with that!!!!! he also have oem pump but a skat 12/17 instead.
As the title say whats wrong with my ski??? Should I change impeller to a skat or what can I do??
 
J

Jordanhiggins2002

Location
Socal
yeah I would like to know that also. my guess would be smaller engine can rev faster and with enhancer, but it hitting harder then your hmmm? oh maybe your bottom end is tired??
 
wsuwrhr

wsuwrhr

Purveyor of the Biggest Brapp
Location
Alta Loma, working in Upland
We'd like to help, but I need some questions answered.

Who built the motor? How many hours are on it? Have you check compression? Do you know if the crank seals are good?

What pipe are you running, how is the water setup on it?

Have you checked to see if the powervalves operate freely?

Let me know.

I know you are in Sweden, but you can call the shop and ask for Kyle.

951-681-1131

Brian
 
S

sniper

Location
sweden
Matt_E said:
Who tuned the DASA?
Click to expand...
I bought the engine and carburators new from Customski in Denmark they built it, the pipe (b-pipe) I had from my old setup a lpw 85,5 big bore. The ignition is new from ATP.
Can the pipe need some adjustment or the powervalves maybe.
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
If a homeported 7xx is doing much better than your engine, then somebody screwed up building & tuning your engine.
I'd take Brian (wsuwrhr) up on his offer and call him.
 
S

sniper

Location
sweden
wsuwrhr said:
We'd like to help, but I need some questions answered.

Who built the motor? How many hours are on it? Have you check compression? Do you know if the crank seals are good?

What pipe are you running, how is the water setup on it?

Have you checked to see if the powervalves operate freely?

Let me know.

I know you are in Sweden, but you can call the shop and ask for Kyle.

951-681-1131

Brian
Click to expand...
Hello

The engine has maybe 5-10 hours on it, I checked compression but that was last year then it was 180 psi in both cylinders.
I will do another test this weekend.
It´s a B-pipe limited I think, do you mean the little screws that are on the pipe? they was setup by lpw, I´ve put in a flow control valve.
I hope the crank seals are good because the engine are almost new.
How do I check the powervalves?
When I´m driving the ski and let off the throttle it`s making a rasping sound (skorrande in swedish if someone here know swedish and can translate better then google). I think the sound is from the powervalves is that normal?

thanks/tomas
 
wsuwrhr

wsuwrhr

Purveyor of the Biggest Brapp
Location
Alta Loma, working in Upland
I am asking general questions to gauge the overall condition/age of the motor since I know little about it at this point.

This is a billet cylinder also, correct?

What I mean by checking the powervalves is if they move freely up and down.

I am assuming this motor has plastic caps on top of the valves, so you will need to remove the pipe to check the valve's operation.

Brian




sniper said:
Hello


The engine has maybe 5-10 hours on it, I checked compression but that was last year then it was 180 psi in both cylinders.
I will do another test this weekend.
It´s a B-pipe limited I think, do you mean the little screws that are on the pipe? they was setup by lpw, I´ve put in a flow control valve.
I hope the crank seals are good because the engine are almost new.
How do I check the powervalves?
When I´m driving the ski and let off the throttle it`s making a rasping sound (skorrande in swedish if someone here know swedish and can translate better then google). I think the sound is from the powervalves is that normal?

thanks/tomas
Click to expand...
 
S

sniper

Location
sweden
Yes it`s a billet cylinder, and the powervalves has a plastic cap.
If the powervalves don´t operate freely can I repair them or do I need to buy new?
 
wsuwrhr

wsuwrhr

Purveyor of the Biggest Brapp
Location
Alta Loma, working in Upland
sniper said:
Yes it`s a billet cylinder, and the powervalves has a plastic cap.
If the powervalves don´t operate freely can I repair them or do I need to buy new?
Click to expand...

First things first.

Likely you can repair them, but if they are stuck, you will need to figure out why. If in fact that is what is wrong.


So since they are covered by the plastic cap, you will probably have to take the pipe off at the manifold so you can remove the plastic caps.

Brian
 
S

sniper

Location
sweden
Well I suppose I´m the bad tuner because it´s me who put the engine in the ski :bad3: This weekend I´m going to do some trouble seeking. Starting with a compression test and checking the powervalves and see if the ignition is good.
 
S

sniper

Location
sweden
Soo now I'm starting over trying to get my engine to work better, I have changed the prop to a solas concord 13/15 and a stubby cone but no difference in the bottom.
Is it possible to change the port timing to get better bottom end? or what can I do..
 
Vumad

Vumad

Super Hero, with a cape!
Location
St. Pete, FL
sniper said:
I have a wamilton pro hull and a stock stroke dasa pv 771cc engine, dual 49 full specs and atp flame ignition a oem pump and a 10/16 hooker thats fine.........BUT when I tried my friends ski a 720cc engine ported by himself I think it was oem carburators and maybe an enhancer, it hit way much better than mine...whats up with that!!!!! he also have oem pump but a skat 12/17 instead.
As the title say whats wrong with my ski??? Should I change impeller to a skat or what can I do??
Click to expand...

Will 49mm carbs even work right on a motor that small?
 
swapmeet

swapmeet

Brotastic
Location
Arlington TX
Conversely... thats a big prop for a 771... I'm sure it will turn it... but I run a 10/16 on a 62T 771 and its great. Unless you're racing....
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
A Solas Concord 13/15 is not a big prop.
The OP is two years old. See most recent post for current prop.
 
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