ET 967 Tuning Thread

[McDog]

I've got a ET967 now because I got a killer deal on a used engine after mine hydrolocked and blew out but Art hasn't been available for any information so I'm starting this thread for a little help/discussion.

So far I've rode it in surf in Daytona and it felt like the power was there but tuning is off for sure. The one thing that feels right is the prop but carbs are muddy and need more tuning and i noticed my powervalves aren't moving much at all while i was flushing the ski. Please post your info here and let's help each other out.

Carbs: mikuni 46's
Main jet: 120
Pilot jet: 130
Popoff: can't remember with 115g spring
Needle and seat: 2.3
Low screw: 1
High screw: 1.25
Pump: Torrent 148
Prop: Skat 10/18
Pipe: powerfactor ran wet
Ignition: ATP Flame total loss
Powervalve Springs: unknown
Hull: Carbon Superfreak

***edited with current jetting

 

[Quinc]

looks lean to me. I am running a similiar setup with a 771cc and running 115M and 130 Pilot on mikuni 46s with 19psi

 

[Chase Musetti]

From my old emails with Art- he recommended 125 pilot and 120 main- I’d also bump that pop off up a tad with a 115g spring.

Ran clean for me.

Bring your ski to Blues in a couple weeks- we’re planning a lake day and will be doing some pump tuning as well. Plus Gary’s ski with the new stroker.

@Blue


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[jaxrider]

Im running 125l 135m 46's b pipe pop around the same as mcdog 148 10/16 5m cut back

 

[McDog]

Im running 125l 135m 46's b pipe pop around the same as mcdog 148 10/16 5m cut back

I think yours are 2.0 n&s though, right?

 

[stefan]

Can this bee a ET tuning thread with 1107 too ???

 

[Big Kahuna]

looks lean to me. I am running a similiar setup with a 771cc and running 115M and 130 Pilot on mikuni 46s with 19psi

ET771?

 

[Quinc]

ET771?

Just a CPT771. Same TL, Pump, lay down wet pipe, carbon hull, carbs. But with 200cc more I would think it would need richer jetting?

 

[Big Kahuna]

Not even in the ballpark.

 

[Storbeck]

Usually same carbs on bigger motor needs smaller jets. Obviously it depends on the individual motor but that's the overall trend.

 

[Big Kahuna]

Wonder why Art at Jetworks told me to go up a few points on jetting when I went from a 735 to a 6mil Dasa 820???????

 

[CARBONX2]

Wonder why Art at Jetworks told me to go up a few points on jetting when I went from a 735 to a 6mil Dasa 820???????

Most likely port timing is higher on the DASA, weakening the signal to carbs

 

[jaxrider]

I think yours are 2.0 n&s though, right?

yes, but i dont think it matters 2.0 -2.3, as long as it pops off in that range. What about return line jet size?

 

[McDog]

I haven't heard of anyone running a return restrictor on regular mikuni carbs. I'd love to hear if anyone is and their results.

 

[jaxrider]

I think most of us in the hugo group are. I drilled stock carbs and added return restrictor.

 

[Onecrazyredhead]

please tell type of pump, prop size, MM, set back or non, intake manifold, ignition and curve or timing setting, weight of rider, and if you have jets spraying into pipes as well . I’m curious as well on this motor.

 

[McDog]

Does anyone know what springs come with the et967 and where to source replacements with different tension besides through Art?

I think most of us in the hugo group are. I drilled stock carbs and added return restrictor.

Why?

 

[Big Kahuna]

you can use different sizes to determine fuel pressure.

 

[McDog]

you can use different sizes to determine fuel pressure.

Yes but Ive never heard of anyone bothering to do so with regular mikuni carbs.

 

[zzylstra]

Does anyone know what springs come with the et967 and where to source replacements with different tension besides through Art?
Why?

I may have a set of springs laying around, not 100% sure if I kept them or sent them down the road to someone else but ill check for you