Ultra LX N/A & STX12/15 Performance

[kawabungus]

My speed is down around 6 mph, clearance gap is .018, dings on prop, scratches on the inside of housing. I've attached pictures. Is it necessary to replace the housing and the impeller?

[smokeysevin]

The gps is correct, the paddle wheel is off. My 12f routinely read 70mph.

Sean

[BenjaminMoore]

I think that magnetic fields can confuse the exact location of GPS

[Gm991]

Nope, no problems, I only run super unleaded in it anyways. Runs really well, speedo is reading 71mph and gps says 67 mph top speed. How inaccurate are those Speedo‘s typically?

thanks

[raven007]

yep. stock. got one on my desk right now.

[jumpyson]

So been reading up on my new to me 2005 stx12f and ecu and the last two digits are "25" not 32 or 36.
the whole number is 21175-3725
So is this the stock ecu?

thanks

21175-3725 ECU is for Kaw stx12f 2003-2004
For 2005 - 21175-3729

Do you have any troubles with it? If it works ok - forget this numbers )

[Gm991]

So been reading up on my new to me 2005 stx12f and ecu and the last two digits are "25" not 32 or 36.
the whole number is 21175-3725
So is this the stock ecu?

thanks

[Livin on the Edge]

Currently am running a 5 degree timing advance and ALWAYS use shell 93 octane fuel. What's the greatest timing advance that's safe ? Is there a how to for cutting the timing wheel. I can find one.

[covfefe]

I am right at 7800 @ 55.7MPH.

https://i.imgur.com/FDOtXEo.png

What RPM's are stock Ultra LX ski's getting at WOT?
Most people seem to be getting 52+ mph

I couldn't get past 47 mph 2 up (tank empty) , total weight 380lbs...... , but would like at least 50 which is what my old stx 1100 used to do 2 up, and it even had a worx scoop slowing it down
Unfortunately I didnt pay any attention to the RPM, but the max recorded on the dash was 7240
The pump doesn't look too healthy, thats next on the list.

[covfefe]

del

[jumpyson]

guys, does anybody know if ECU (CDI) of Ultra LX and STX are interchangable? parts numbers are different...
my friend cann't find ECU for Ultra LX '07
thanks for help

[JamieCraigGreenfield]

Did a quick search on here and google but didnt find anything. Is there a turbo kit available for the 15f? Thinking about building one

[STX11]

What RPM's are stock Ultra LX ski's getting at WOT?
Most people seem to be getting 52+ mph

I couldn't get past 47 mph 2 up (tank empty) , total weight 380lbs...... , but would like at least 50 which is what my old stx 1100 used to do 2 up, and it even had a worx scoop slowing it down
Unfortunately I didnt pay any attention to the RPM, but the max recorded on the dash was 7240
The pump doesn't look too healthy, thats next on the list.

[Livin on the Edge]

Oops wrong link. http://pages.ebay.com/link/?nav=item...d=381347463932

[Livin on the Edge]

Never did the kaniflex hose to the front. Will the 28" hose on eBay be long enough? http://pages.ebay.com/link/?nav=item...d=191652739821 also with a 5 degree timing advance should I deploy a bigger walpro fuel pump?