MS661 vs 390XP

[KG441c]

HOW DO YOU RE CALIBRATE

Put saw on choke and crank and leave on choke running for 90 sec without touching throttle then set all the way to off. Put in run position and repeat. Recrank and make at least 5 full cuts. Recalibrated

 

[blsnelling]

HOW DO YOU RE CALIBRATE

Please start a new thread. Thanks.

 

[mdavlee]

Brad what kind of compression you running on the 661?

 

[KG441c]

Please start a new thread. Thanks.

Sorry Brad . I was just tryin to help him

 

[blsnelling]

Brad what is the key in the porting to the nastiness of the 390 rpm and cut speed?

It's the Snellerization process

 

[KG441c]

It's the Snellerization process

Well it is close to Christmas Scrooge!!! U could be in the giving mood!!

 

[blsnelling]

Well it is close to Christmas Scrooge!!! U could be in the giving mood!!

Offering numbers just seems to invite criticism any more. If you're interested in what I do, send me a PM. I'd be happy to share.

 

[KG441c]

Offering numbers just seems to invite criticism any more. If you're interested in what I do, send me a PM. I'd be happy to share.

Thanks. Sometimes that criticism made good threads and alota good info but also got out of hand too and got nasty at times.

 

[blsnelling]

Brad what kind of compression you running on the 661?

I don't have my specs here, but its under 200.

 

[Time's Standing Stihl]

A ported 372 is king of 70cc class saws.

You considering a 461 in the same class??

 

[Trx250r180]

My hybrid reads 20 psi less after it is warmed up .that helps restart easier when set it down ,only 210 psi warmed up

 

[blsnelling]

You considering a 461 in the same class??

I do, and that would be a very close race, just as it would with my hybrid. I have not done a shootout with my newest 372 or 461s. All three make awesome saws!

 

[Ironworker]

Please start a new thread. Thanks.

 

[Moparmyway]

May be buying a new cylinder!!! Its tight!!

How tight ?

 

[KG441c]

My hybrid reads 20 psi less after it is warmed up .that helps restart easier when set it down ,only 210 psi warmed up

Mine after tightening it the otherday will pop the decomp on the 1st pull of 4" of rope

How tight ?

.019

 

[Moparmyway]

Mine after tightening it the otherday will pop the decomp on t

.019

You will be just fine - I have .017 on my 044, plus I been running .016 in my 661

 

[KG441c]

You will be just fine - I have .017 on my 044, plus I been running .016 in my 661

Whoa!! Believe ill stay where I am with the 238psi. Ive never ran below .020 on bigger bores

 

[KG441c]

You will be just fine - I have .017 on my 044, plus I been running .016 in my 661

Whats the psi on the 661?

 

[MustangMike]

Brad, hope someone will bring some of your saws to the CT GTG. A ported 372 is very fast with a 20" bar, but I doubt it will pull a long bar like a ported 461 or 460. I could be wrong, have never seen one with a long bar on it. Usually, with the longer bars, size matters.

 

[blsnelling]

There's a whole lot more than compression to building a strong saw. For just one example, I have a hybrid out there with no machine work at all that has no trouble at all holding its own. Compression is just one piece of the pie and should not be singled out as a magic maker.