Testing different timing advances on tree monkeyed 661

[Moparmyway]

Maybe its the VP ?

 

[jmssaws]

Maybe its the VP ?

I'm sure with 91 or 93 it would have been fine.

 

[Moparmyway]

I'm sure with 91 or 93 it would have been fine.

If youre sure, then before I do anything else, I'll mix up a tank of 110LL and see if it goes away

 

[Redfin]

Maybe its the VP ?

Thats a possiblity. I havent heard this is any of the ones I have done. I run either 91 pump or av.

 

[Mastermind]

I've yet to see detonation in any saw that was running good fresh fuel.

Of course all my saws are slow as hell......

 

[tree monkey]

tm2 has 195 lbs comp
tm5 has 200 lbs comp
91 non e pump gas
non of the 661's I've done do this

 

[tree monkey]

this is detonation, ms361 with well over 300 lbs comp

 

[mdavlee]

Yikes

 

[Mastermind]

View attachment 46887

View attachment 46887

View attachment 46889

this is detonation, ms361 with well over 300 lbs comp

That Dirko makes me hawt.

 

[tree monkey]

porting does it for me, I get to handle other men's jugs and put my tool in all there ports

 

[tree monkey]

most guys want there base cut, most need it. makes for a nice tight squish, there's nothing better then a tight squish.
some guys even have me stroke there cranks.

 

[Moparmyway]

That settled the fuel issue.
Fresh 110ll mixxed 25:1 with 2R still pops.

 

[Moparmyway]

I've yet to see detonation in any saw that was running good fresh fuel.

Of course all my saws are slow as hell......

The VP that I use is right out of the can, pure and fresh

 

[tree monkey]

run it without the muffler

 

[Moparmyway]

Its already off, but I've got a 3 year old that is attached to her Dads leg right now .........

 

[tree monkey]

do you have a inline spark tester like a zat4?

 

[mdavlee]

Its already off, but I've got a 3 year old that is attached to her Dads leg right now .........

Mine is asleep so I'm taking advantage.

 

[Moparmyway]

Its worse with the muffler off

 

[Moparmyway]

do you have a inline spark tester like a zat4?

I might

 

[Moparmyway]

Zat 4

Googled it, got the oriental version, I guess.

Its not the spark dropping, I'm starting to think its just a hard 4 stroke.

My Hardline stays still @ 13,620 and the 4 inline testers all stay steady