Echo 490 to ported 4910…to cs-5484

[Ketchup]

I looked up the parts numbers on the coils. 490, 4910, 501p and 501sx all have different parts numbers and prices. 501p is a different color too.

 

[Dolkitafreak]

I looked up the parts numbers on the coils. 490, 4910, 501p and 501sx all have different parts numbers and prices. 501p is a different color too.

4910 and 501 have different colored plug boots and kill switches, I haven’t found a timing or performance difference between the two.

 

[Duane(Pa)]

Are all, any, or none of the coils rev limited? I'm not sure I have heard the definitive answer...

 

[srcarr52]

Are all, any, or none of the coils rev limited? I'm not sure I have heard the definitive answer...

I can confirm the 4910 and the 501P are NOT rev limited coils.

 

[Ketchup]

. Very, very ugly.

That gasket was made from the wall of a milk carton. Worked well, looks terrible. Probably lost the bearings too.

 

[srcarr52]

. Very, very ugly.
View attachment 371377View attachment 371378View attachment 371379
That gasket was made from the wall of a milk carton. Worked well, looks terrible. Probably lost the bearings too.

Wow, did it even have an air filter on it?

 

[Ketchup]

Wow, did it even have an air filter on it?

Right? It didn’t look that dirty because everything was just going through it.

 

[drf256]

Maybe burning sawdust caused the pop

 

[Ketchup]

Maybe burning sawdust caused the pop

I hope that’s it but I ordered a new 4910 coil along with seals and gaskets. Hoping I can flush the bearings. If not then there’s the opportunity for stroking experiments! It would be cool to cram a 6100 crank in there…

 

[huskihl]

If your throttle would only open 90% or so, that could explain the popping or 4 stroking. They will be quite rich if the throttle plate isn’t open.

 

[srcarr52]

If your throttle would only open 90% or so, that could explain the popping or 4 stroking. They will be quite rich if the throttle plate isn’t open.

Yup at 75% throttle or so these carbs will go really wonky.

 

[huskihl]

Yup at 75% throttle or so these carbs will go really wonky.

Ported 394 syndrome…

 

[Red97]

If your throttle would only open 90% or so, that could explain the popping or 4 stroking. They will be quite rich if the throttle plate isn’t open.

Was wondering that as well...

 

[Ketchup]

If your throttle would only open 90% or so, that could explain the popping or 4 stroking. They will be quite rich if the throttle plate isn’t open.

Agreed. I’m not sure exactly how much throttle I was getting. 90% is in the ballpark. The boot angles down pretty close to the butterfly, so even a little bit could make a big difference. Hopefully Mr. Ruger fixed that.

Tell me more about ported 394 syndrome. I had a Miller Mod 394 that did have carb issues. Unfortunately that jug was sacrificed to the cracked intake gods.

 

[Red97]

No... maybe?? Nah.... Prolly be fun? Nope shouldn't be done.... But think of the fun.
dont even think about it.... sure is tempting...

Darn you @Ketchup

 

[Ketchup]

No... maybe??

Yes. Definitely.

Nah.... Prolly be fun? Nope shouldn't be done.... But think of the fun.

All work and no play makes Joe a dull boy.

dont even think about it.... sure is tempting...

Do what you feel.

Darn you @Ketchup

You’re welcome.

 

[huskihl]

Agreed. I’m not sure exactly how much throttle I was getting. 90% is in the ballpark. The boot angles down pretty close to the butterfly, so even a little bit could make a big difference. Hopefully Mr. Ruger fixed that.

Tell me more about ported 394 syndrome. I had a Miller Mod 394 that did have carb issues. Unfortunately that jug was sacrificed to the cracked intake gods.

The throttle cable sheath stops in a recess in the floor. Once you lower the jug .050 or .060”, the cable is sometimes too long. Carb floor stays the same. Intake block, carb and elbow move down with the cylinder

 

[Woodpecker]

No... maybe?? Nah.... Prolly be fun? Nope shouldn't be done.... But think of the fun.
dont even think about it.... sure is tempting...

Darn you @KetchupView attachment 371534

Oh my

 

[drf256]

I hope that’s it but I ordered a new 4910 coil along with seals and gaskets. Hoping I can flush the bearings. If not then there’s the opportunity for stroking experiments! It would be cool to cram a 6100 crank in there…

An attempt at humor. The throttle position, like they said above, can do weird stuff with tune and fuel puddling.

 

[Ketchup]

Partly funny because it’s possible. I didn’t see signs of pooling. I think I’m slowly ticking off issues.