Freestyle ET1107cc Tuning Thread

[waxhead]

I have recently built an ET1107 running PFP wet, zeeltronic TL, dual mikuni 46s, 150 psi compression on an aggressive curve provided by @Jcary85 . 155 OEM pump in a carbon superfreak.

I started as directed by Art before he passed away for:
130 pilot
120 main
17 psi all at 7k foot elevation.

I have to close all my screws almost all the way in and it's not running well. Advice on recommended jet sizes to try? I'm not running any jet in my return line either. Figured it wasn't needed for mikunis that have not been modified. I was told this motor does best with reverse jetting but that may have been with modified big carbs? Sorry I'm rambling....

Why only 150psi, ??

 

[Mastermax]

Why only 150psi, ??

I'm looking for domes to increase compression. No luck yet.

 

[Jcary85]

I'm looking for domes to increase compression. No luck yet.

I’m amazed you got 150 though. His pump domes make like 180. Has the motor been apart? Maybe it’s got a really thick base gasket? Maybe check your squish.

 

[jo5hi3]

I have recently built an ET1107 running PFP wet, zeeltronic TL, dual mikuni 46s, 150 psi compression on an aggressive curve provided by @Jcary85 . 155 OEM pump in a carbon superfreak.

I started as directed by Art before he passed away for:
130 pilot
120 main
17 psi all at 7k foot elevation.

I have to close all my screws almost all the way in and it's not running well. Advice on recommended jet sizes to try? I'm not running any jet in my return line either. Figured it wasn't needed for mikunis that have not been modified. I was told this motor does best with reverse jetting but that may have been with modified big carbs? Sorry I'm rambling....

7k elevation... that is the reason for 150 psi.

 

[Mastermax]

I’m amazed you got 150 though. His pump domes make like 180. Has the motor been apart? Maybe it’s got a really thick base gasket? Maybe check your squish.

At 7k elevation you loose close to 30 psi compression.

 

[stefan]

Doo you have internal return j’ets drilled out ? I run 49 FS and run a 100 jet in return, and my pop of around 21 psi

 

[Mastermax]

Doo you have internal return j’ets drilled out ? I run 49 FS and run a 100 jet in return, and my pop of around 21 psi

No. Should I? If so what size should I drill them to.

 

[waxhead]

At 7k elevation you loose close to 30 psi compression.

Do you always ride there. you can go for smaller domes

 

[Mastermax]

Do you always ride there. you can go for smaller domes

I can't find smaller domes for ET. I always ride here. I tune my ski for elevation.

 

[Jcary85]

I can't find smaller domes for ET. I always ride here. I tune my ski for elevation.

Gonna be tough considering Art passed away. Maybe contact Mark Erickson. He did a bunch of ET motors and MAYBE could make some domes?

 

[Mastermax]

Thanks @Jcary85 I'll try and track him down.

Further updates:

The ski won't rev out of water. It almost sounds like it's hitting a rev limiter around 4k rpm? I've checked the compression, fuel delivery, and reeds. I'm curious if something electrical is going on.

Here's a pic of the domes and pistons.




I've tested spark with the zeeltronic test button and when cranking with the plugs grounded to the head. All checks out. Is it normal for such a difference between the front a rear cylinders? The coil is OEM and probably 10 years old. Not sure if those go bad but still work below 4k rpm?

I've gone through every suggested jet and pop off combo and nothing changes this issue.

Edit: Wax sent me a new curve and I'll test that version out tomorrow.

 

[Jcary85]

Thanks @Jcary85 I'll try and track him down.

Further updates:

The ski won't rev out of water. It almost sounds like it's hitting a rev limiter around 4k rpm? I've checked the compression, fuel delivery, and reeds. I'm curious if something electrical is going on.

Here's a pic of the domes and pistons.
View attachment 411870
View attachment 411871


I've tested spark with the zeeltronic test button and when cranking with the plugs grounded to the head. All checks out. Is it normal for such a difference between the front a rear cylinders? The coil is OEM and probably 10 years old. Not sure if those go bad but still work below 4k rpm?

I've gone through every suggested jet and pop off combo and nothing changes this issue.

Edit: Wax sent me a new curve and I'll test that version out tomorrow.

If it won’t rev out of the water it’s likely electrical. If you have a stock 760 cdi, slam that in and test real quick. Doesn’t hurt to grab another coil and try that. You can ohm test them to see if the windings are shorted. I’d make sure the flywheel key didn’t sheer and flywheel moved or something. Is your static angle correct (56) in zeel config? Could be failing pickup also.

I’d also just visually check you have fuel coming out of both carbs when u rev it up. Also, hover your hand over each carb while running and feel for pressure coming out of the carbs (bad reeds). Might be worth just looking at the reeds.

 

[Mastermax]

Inspected reeds, they are mint. Fuel dribbles out of both bomb sites in the carbs. Static angle is correct.

I'll order a new coil just to be safe.
I have an old cdi to test, but I'm non sure if it will work. I've ripped all the extra stuff out if the ebox. Only thing I'm running in there are the parts needed for total loss.

I've heard extra grounds from ebox to motor are sometimes needed. Is this the case for zeel as well?

Thanks for the tips @Jcary85 , I'll report back.

 

[Jcary85]

Inspected reeds, they are mint. Fuel dribbles out of both bomb sites in the carbs. Static angle is correct.

I'll order a new coil just to be safe.
I have an old cdi to test, but I'm non sure if it will work. I've ripped all the extra stuff out if the ebox. Only thing I'm running in there are the parts needed for total loss.

I've heard extra grounds from ebox to motor are sometimes needed. Is this the case for zeel as well?

Thanks for the tips @Jcary85 , I'll report back.

An extra ground can’t hurt but all you really need is the one that goes to the stator.

 

[waxhead]

Damn dude. what jets are in that. look at the piston wash on it. Its like they are new but one piston has some build up on it. Its not a blown o-ring as it would then rev our of the water and not in it.

 

[Mastermax]

Damn dude. what jets are in that. look at the piston wash on it. Its like they are new but one piston has some build up on it. Its not a blown o-ring as it would then rev our of the water and not in it.

115 main 130 pilot at 17psi. Leaner than what Art recommended. :/

 

[Mastermax]

Should I got to a leaner setup such as a 120 Pilot, 110 main? My biggest fear is going too lean on my new setup.

 

[Jcary85]

Should I got to a leaner setup such as a 120 Pilot, 110 main? My biggest fear is going too lean on my new setup.

Have u dialed in the low screws until you hit the off idle lean bog? You basically need to do that then go out a 1/4 turn. Then see where the screws are at. If you are way in, go down on low speed jet. If you are way out, go up.

 

[Mastermax]

Have u dialed in the low screws until you hit the off idle lean bog? You basically need to do that then go out a 1/4 turn. Then see where the screws are at. If you are way in, go down on low speed jet. If you are way out, go up.

Fantastic advice. Thanks @Jcary85, your help is much appreciated.

 

[Christian_83]

Thanks @Jcary85 I'll try and track him down.

Further updates:

The ski won't rev out of water. It almost sounds like it's hitting a rev limiter around 4k rpm? I've checked the compression, fuel delivery, and reeds. I'm curious if something electrical is going on.

Here's a pic of the domes and pistons.
View attachment 411870
View attachment 411871


I've tested spark with the zeeltronic test button and when cranking with the plugs grounded to the head. All checks out. Is it normal for such a difference between the front a rear cylinders? The coil is OEM and probably 10 years old. Not sure if those go bad but still work below 4k rpm?

I've gone through every suggested jet and pop off combo and nothing changes this issue.

Edit: Wax sent me a new curve and I'll test that version out tomorrow.

Hi dude, i dont wanna stress you out - but are you running a ET crank?
Could you please verify that your crank is true 180 degree phase, pics might be deciving - but it looks like both pistons has open exhaust port.
I bought a brand new ET engien from Art (RIP) for a freind, that that a ET crank in it, which twisted out of phase with initial start up - ski had not been in water yet, so no it could not have hydro locked.