Any Interest In Revisiting Porting The 550XP?

[SierraWoodsman]

Nice! Was this the extra spicy one?

Beautiful work Randy! I can't wait to get my 550 back from you.
The Tach looks to be bouncing a lot like you said, but it was holding
12K+ from what I could tell. I have the same Tach and noticed it is a little "finicky"
when it's proximity is not just right...Thanks for the long awaited video

 

[Mastermind]

Beautiful work Randy! I can't wait to get my 550 back from you.
The Tach looks to be bouncing a lot like you said, but it was holding
12K+ from what I could tell. I have the same Tach and noticed it is a little "finicky"
when it's proximity is not just right...Thanks for the long awaited video

This was the XP....it has a little tighter squish......aside from that they are the same.

The "G" model is going to Germany and I don't know anything about their fuels. I figured better safe than sorry on it.

 

[baltic]

The "G" model is going to Germany and I don't know anything about their fuels. I figured better safe than sorry on it.[/QUOTE]

no problems with fuels here ,thanks for your good care ,can't wait to try her in wood

 

[Mastermind]

The "G" model is going to Germany and I don't know anything about their fuels. I figured better safe than sorry on it.

no problems with fuels here ,thanks for your good care ,can't wait to try her in wood[/QUOTE]

Cool.......there's only a few psi difference in compression on two.

 

[wyk]

The "G" model is going to Germany and I don't know anything about their fuels. I figured better safe than sorry on it.

no problems with fuels here ,thanks for your good care ,can't wait to try her in wood[/QUOTE]

I haven't found less than 91(AKI) octane in most of Europe(usually labelled as 95 RON). Remember, in the States, the US gov set the minimum to 87 AKI(85 for higher altitudes)so that it was standardized due to all the crazy different numbers and standards back in the 60's. Thus, they basically standardized low octane. That never really happened in Europe. High compression small engines have been the norm for a long time now.

Octane rating - Wikipedia, the free encyclopedia

 

[tbone75]

Dang you Randy ! Now I just don't know if I want a 550 or a 346 done ? :bang: Had the 346 with the AM top end you did , but now you say you can make them even stronger !

Both would be real nice ! LOL

Can't manage both for a good while ! LOL Plus got to get a 550 first too ! LOL

Just gonna dream a while yet. :hmm3grin2orange:

 

[Mastermind]

Those videos sure affected my telephone.

It won't stop ringing. :hmm3grin2orange:

 

[hotjava66]

How about the 550XP in Chestnut Oak?

[video=youtube;8ej2Umdpu-I]http://www.youtube.com/watch?v=8ej2Umdpu-I&feature=youtu.be[/video]

:msp_w00t::yourock:

 

[Naked Arborist]

I like the way it sounds, crisp.:msp_thumbup:

 

[Naked Arborist]

Those videos sure affected my telephone.

It won't stop ringing. :hmm3grin2orange:

That means one of two things, probably both. The vultures are circling and/or people are actually willing to spend some coin.

 

[Nitroman]

These threads on little saws are very kewl and always informative. How about another on the mighty 3120? Please?:hmm3grin2orange:

 

[SierraWoodsman]

Out of curiosity, What kind of compression numbers did you end up with of those 550's?

 

[Naked Arborist]

Good Idea! The wife has me on the same program this summer. I'm really enjoying it!!:msp_thumbup:

 

[stihlonlynow]

Looking at the last line of your sig..... you got 3 with Terry?

Thats allright they all show up on my green tractor!! green saw you say? Nope wouldnt own one. :hmm3grin2orange:

 

[Mastermind]

Out of curiosity, What kind of compression numbers did you end up with of those 550's?

Around 220 psi

 

[Trx250r180]

Around 220 psi

i thought the drop start looked similar to how i have to start my bigger saws ,saw sounds crispy ,good job Randy :greenchainsaw:

 

[Mastermind]

i thought the drop start looked similar to how i have to start my bigger saws ,saw sounds crispy ,good job Randy :greenchainsaw:

A lot of folks would be scared of that much compression.....but in a 44mm bore it ain't bad at all.

I have a sliding scale sorta thing for the compression........220 in a 50cc......210 in a 60cc........200 in a 70cc........

 

[skylogger]

How do you treat the autotune after the saw is back together? Do you reset with the software and do the 3-5 minute full throttle in cut or just leave it alone?

 

[Mastermind]

These threads on little saws are very kewl and always informative. How about another on the mighty 3120? Please?:hmm3grin2orange:

Soon.......

How do you treat the autotune after the saw is back together? Do you reset with the software and do the 3-5 minute full throttle in cut or just leave it alone?

If the saw has time on it I do the reset. Both of these were new saws though. I've never had any trouble with these autotune saws unless I created an air leak, or missed up while tweaking the carb.

 

[skylogger]

Do you think the 3-5 minute run at full throttle is necessary?