Testing 661 - coils 4700D 4700C 4701A 4700D

[Redbull661]

(about a week ago I contacted stihl and they told me

 

[Deets066]

Not really enough to worry about then?

RPM in the cut is very similar, which one "feels" the best?
I remember you showin me a few vids of different coils, I still remember which one looked and sounded the best

 

[mdavlee]

4700D sounds the most spot on in the cut. That would be my pick if you stay with mtronic.

 

[DND 9000]

With every control unit should be made a few cuts and after that the fuel settings (switching cycle of solenoid valve) should be checked with the diagnostic tool. That would be intresting to know.

 

[Stihl working Hard]

Not really enough to worry about then?

RPM in the cut is very similar, which one "feels" the best?
I remember you showin me a few vids of different coils, I still remember which one looked and sounded the best

I agree Iam running the 4701A coil I am happy with the way it's going Iam not worried about 200 RPM it doesn't behave as bad as it did before

 

[Gunn]

Did they make you contact Rick Knop regarding the the coils @Redbull661 ?

 

[Stihl working Hard]

yeah this test was quite the process. Hook up new coil, cut for a while..wanted to make 100% sure the mtronic had the new values etc before I did my test cuts. Took about 3 hrs.

wish I had an mdg1 laying around to plug into. It would be interesting to see if the fuel values change based on, muffer mod, bar length, ported or vs stock and the diff coils.

Fuel values given to me via stihl were

4700c 4700 d: Factory spec 70, low/bad 65
4700E 4701A : factory spec 72 low/bad 69






I'd say "D" felt the best. Nice call by @mdavlee . But on the other hand you have times and temps which are basically identical and you have stihl telling you that 4700c & 4700d have been known to let the saw go too lean and seize. Me personally: I'll be getting the C &D changed over to 4701As...not worth the risk.

And I would have to speculate that the 4701A would be better on the long bar if it's richer. I mean if your really serious about short bar racing I'd say put a wj69 on it. IMO Just not worth the risk.

Awesome thread @Redbull661 really captivating I have learnt alot about the 661 thanks to you .putting in the time and effort to do this has paid dividends and I thanks you

 

[big t double]

you have nice wood.

 

[Stihl working Hard]

you have nice wood.

Don't forget the saws as well

 

[big t double]

Don't forget the saws as well

yes that too...ive seen a few of his saws...he carries like 6 or 8 of them in the trunk of his camry or whatever the *f-word it is....along with like 65 bars and several gallon milk jugs full of premix. redbull has a serious problem.

 

[junkman]

What kind of tach are you using to get the readings ? Is it hardwired in ?

 

[Mastermind]

Redbull has my respect.

Thanks for all the testing you do Julian.

 

[mdavlee]

If I get one swapping to a wj69 or something similar would be my setup. Mtronic is ok but mine probably won't be a work saw

 

[Redbull661]

What kind of tach are you using to get the readings ? Is it hardwired in ?

was using tree monkey's tach.

Thanks dude.

 

[junkman]

was using tree monkey's tach.

Thanks dude.

That should be pretty accurate if the lead clips to the coil wire

 

[JeffGu]

...was using tree monkey's tach...

Didn't I see that thing on an episode of the Red Green Show?

 

[Glock37]

you have nice wood.

Ted do you say that all the time when you see a guys big pile ?

 

[big t double]

Ted do you say that all the time when you see a guys big pile ?

The comment usually comes to mind, yes. Why, do you have a big pile you'd care to share Mike?

 

[Glock37]

Because im full of sh*t most of the time Ted


Sent from my iPhone using Tapatalk

 

[Redfin]

was using tree monkey's tach.

Thanks dude.

Whats up with the copper? Clamp to the handle of a saw?