Engine issues (video included) (2024)

giwprez

Member

Jun 24, 2024

I'm guessing that I have issues with crank seals, but can anyone watch this video and listen to engine to give a heads up on what could be going on? Engine misses, adjusting carb doesn't seem to help much. One straight it may be fine, the next it's falling on its face. Mikuni on alky.... .100 timing. Rotax DSC rotary. EGT stayed between 600-700 all day.

I appreciate the help if any can be given. You may reply here or on the video comments.

Bradley71

Member

Jun 24, 2024

It just sounds really fat on top.wheres ur needles set.

Bradley71

Member

Jun 24, 2024

I wouldnt go past 13/4 turns in on mikuni.sounds fat to me tho.

Bradley71

Member

Jun 24, 2024

Ya can have your buddy spray ether around the crankseals to see if it gets radical while its running on stand

Bigeasyebo

Member

Jun 24, 2024

giwprez said:
I'm guessing that I have issues with crank seals, but can anyone watch this video and listen to engine to give a heads up on what could be going on? Engine misses, adjusting carb doesn't seem to help much. One straight it may be fine, the next it's falling on its face. Mikuni on alky.... .100 timing. Rotax DSC rotary. EGT stayed between 600-700 all day.
I appreciate the help if any can be given. You may reply here or on the video comments.
Click to expand...

No help on the engine hear, but this looks awesome! Would love to race in this.

giwprez

Member

Jun 24, 2024

Bradley71 said:
It just sounds really fat on top.wheres ur needles set.
Click to expand...

I had inital setup on 1 1/2 L and 1 1/2 H. Ended up around 1 1/2 L and 1 1/4 high. It just never really cleaned out. I agree, I believe it's a carb issue without question.

Colt sr

Member

Jun 24, 2024

Bigeasyebo said:
No help on the engine hear, but this looks awesome! Would love to race in this.
Click to expand...

That looks like cridersville speedway in Ohio.

phantomkartracer

Member

Jun 24, 2024

IDK. EGT seems really cold. Maybe try another carb????

I would think if you were having issues with the seals, it would be running lean.

Brian #89

medusa51

Member

Jun 24, 2024

When I had that problem the carb was to big. plus not turning enough rpm.

Radialfin

Member

Jun 25, 2024

Strikes me as an ignition problem. Sure, it’s fat on the high jet but it’s also not really getting a chance to fully clear itself out.

Do you have an RPM readout? Might be worth checking if there’s a loss in ignition signal. If you have a means to hand choke that can help isolate leaks and fuel delivery issues on track.

giwprez

Member

Jun 25, 2024

RadialFin said:
Strikes me as an ignition problem. Sure, it’s fat on the high jet but it’s also not really getting a chance to fully clear itself out.
Do you have an RPM readout? Might be worth checking if there’s a loss in ignition signal. If you have a means to hand choke that can help isolate leaks and fuel delivery issues on track.
Click to expand...

I haven't downloaded the mychron data yet .. so hopefully that can lead me towards what's happening as well. I need to have a closer look at the egt to see if it's detonating.... I do know that the gear ratio I'm running, this thing should be screaming... But it maxed out at 13k. I can try another carb and a different coil... Unfortunately, I don't have another option for the stator.

phantomkartracer

Member

Jun 25, 2024

Did you happen to try a new spark plug?

giwprez

Member

Jun 25, 2024

phantomkartracer said:
Did you happen to try a new spark plug?
Click to expand...

I did switch plugs. 2413 autolite

Radialfin

Member

Jun 25, 2024

giwprez said:
detonating.... I do know that the gear ratio I'm running, this thing should be screaming... But it maxed out at 13k.
Click to expand...

Yeah they will spin as high as 19k if you let them. For an oval of course, no point in going that high. Detonation should be easy to tell from the piston crown, maybe you’re not able to get at the kart right now? Pull head or header off and have a peek.

What ignition is on it? PVL or Motoplat?

Fresh fuel?

giwprez

Member

Jun 25, 2024

We got a problem. Haha. It's a motoplat ignition. Large taper I believe, that's why I only have one magneto.

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Radialfin

Member

Jun 25, 2024

Yikes. RIP piston. I'm impressed it didn't lock up. Time to do a pressure test on the engine and carb. Make sure you're not leaking at the rotary valve cover gasket too.

Yeah those motoplats are hard to find and not cheap when you do find one.

giwprez

Member

Jun 25, 2024

RadialFin said:
Yikes. RIP piston. I'm impressed it didn't lock up. Time to do a pressure test on the engine and carb. Make sure you're not leaking at the rotary valve cover gasket too.
Yeah those motoplats are hard to find and not cheap when you do find one.
Click to expand...

Any certain standard pressure an engine should maintain?

Radialfin

Member

Jun 25, 2024

5psi for 20mins or so is a good rule of thumb.

giwprez

Member

Jun 26, 2024

RadialFin said:
5psi for 20mins or so is a good rule of thumb.
Click to expand...

Upon further inspection...... I believe the rotary valve was installed incorrectly... It was opening at approximately 175° btdc and close at approximately 25° atdc. Stock settings call for 132° btdc and 75° atdc ... Is this a possible result?

I'm guessing my dumb@$$ just threw this thing together 20 years ago to get it cleaned up to set on the bench and didn't properly install the disc.

The bore, after hone, is approximately 50.29.... Haddock said a 50.19 would work.

Will these work or not? https://www.italianmotors.com/collections/vintage-parts/products/iame-ica-engine-piston-kit

Radialfin

Member

Jun 26, 2024

Yep I’ve had that situation where the disk was in the wrong position, it ran like crap and eventually the engine seized. Good call checking it. Clearance wise, go with whatever Haddock says.

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