Husqvarna 550xp pop up

[WoodsliverDan]

Ok, thanks!

 

[blsnelling]

Half the key a good starting point?

That would be a lot.

 

[WoodsliverDan]

How are they doing with heat after timing advance? That's my main concern.

 

[tree monkey]

your a long ways from needing to worry about heat

 

[WoodsliverDan]

your a long ways from needing to worry about heat

Explain? Strato engines run hot. 550xp's are known to over heat. What am I missing?

 

[Nutball]

Why not add surface area to the fins, cuts into the edges? Open up some of the tight squeezes between the fins: around the ports and where unnecessary casting material is. A question I've had for a while: would polished fins cool better with faster flow to slip by closer to the surface or would the stock or a rougher finish be better for cycling fresh cool air from the channels between the fins?

 

[WoodsliverDan]

The fins aren't the issue. It's the top cover. Even modified ones are bad flow. They heat soak the carb as well.

 

[tree monkey]

Explain? Strato engines run hot. 550xp's are known to over heat. What am I missing?

julian and I have done a lot of cylinder temp testing on both stock and ported saws.
I don't think the lite mods your doing is going to increase cylinder temps

 

[huskyboy]

Gutting the very restrictive muffler is going to help a lot with heat.

 

[WoodsliverDan]

julian and I have done a lot of cylinder temp testing on both stock and ported saws.
I don't think the lite mods your doing is going to increase cylinder temps

'Lite' mods? Uhh ok. Compression, rpms and timing create heat. This saw is already known to overheat. Maybe stick to a saw you're more familiar with, I'm looking for real answers on this model. Thanks.

 

[dieselfitter]

How much weight did you remove from the piston?

 

[WoodsliverDan]

How much weight did you remove from the piston?

Not a lot, but it's heavy to begin with since it's a strato. I didn't weigh before and after. 1/8th ounce?

 

[WoodsliverDan]

Gutting the very restrictive muffler is going to help a lot with heat.

I have already started on that as well. I agree.

 

[dieselfitter]

'Lite' mods? Uhh ok. Compression, rpms and timing create heat. This saw is already known to overheat. Maybe stick to a saw you're more familiar with, I'm looking for real answers on this model. Thanks.

lol yeah Scott. sounds like you don't know what you are talking about. Maybe you should stfu.

 

[tree monkey]

'Lite' mods? Uhh ok. Compression, rpms and timing create heat. This saw is already known to overheat. Maybe stick to a saw you're more familiar with, I'm looking for real answers on this model. Thanks.

lol, wow dude I don't know why your asking any questions, you seem to already know all the answers.

 

[tree monkey]

lol yeah Scott. sounds like you don't know what you are talking about. Maybe you should stfu.

I think i'll just go stand in the corner now. lol

 

[mortalitool]

'Lite' mods? Uhh ok. Compression, rpms and timing create heat. This saw is already known to overheat. Maybe stick to a saw you're more familiar with, I'm looking for real answers on this model. Thanks.

Do you know who you're talking to?

Sent from my SM-G935P using Tapatalk

 

[WoodsliverDan]

Do you know who you're talking to?

Sent from my SM-G935P using Tapatalk

Yes, Scott Kunz aka tree monkey from Wisconsin.

 

[WoodsliverDan]

Scott, please explain what else there is to do to a 550xp, cylinder/piston mod wise? I have not heard anything about ignition timing so I asked.

I'll wait.

 

[huskihl]

Scott, please explain what else there is to do to a 550xp, cylinder/piston mod wise? I have not heard anything about ignition timing so I asked.

I'll wait.

He can't explain in a thread or via pics what took him 40 years to learn. Also, no 2 guys will port a saw the same way so what works for others may not work for you.