Fist time porting question (372)

[Westboastfaller]

I've seen different plugs act funny in high compression areas. Its worth a try. And maybe a different coil OEM if you have one.

Sent from my SM-G892A using Tapatalk

"and Bingo was his name-o"

Good calls friend.

Those coils are hit and miss anyway.
Plugs fail under comp and as comp rises it will fade. You can see that in a clear plug tester.

Always worth taking 10 min to think about things...or a couple hours.

Life is a thinking game and nothing more

 

[Andyshine77]

Here is a simple one. Is the throttle cable stretched preventing the carburetors from going to full throttle? I've seen this happen a couple times.

 

[Westboastfaller]

André ..he ran 2 top ends on
same saw, with which one was without problem

 

[Andyshine77]

André ..he ran 2 top ends on
same saw, which one was without problem

Missed that.[emoji111]

 

[Westboastfaller]

May as well get it all on the table.
*I hate prob questions*
Riglgy searment guy? or chewing tobacco ?? IDK maybe I'm watching too much ball.

No, so is that piston for 372???

OR...you have a different piston from another saw..

So are they both decked or what piston?

 

[Ronie]

May as well get it all on the table.
*I hate prob questions*
Riglgy searment guy? or chewing tobacco ?? IDK maybe I'm watching too much ball.

No, so is that piston for 372???

OR...you have a different piston from another saw..

So are they both decked or what piston?

Maybe it was the plug. The piston is for a 268. I have another saw with the same cylinder and piston combination that wasn't ported and the piston was cut flat, no pop up. That saw runs real good.

 

[Westboastfaller]

[QUOTE="Ronie, post: 6808125, member: 154222] The question is, what controls how high a saw will rev? Any help would be appreciated.

[/QUOTE] Any one of 'fuel,' 'spark', 'compression ' or 'timming '

Is your spark blue or yellowy orange?

 

[Ronie]

What I'd really like to know is what limits the wide open rpm? Like is it when the transfers open or something else? I'm talking just about the cylinder, I understand that the carb can limit the rpm. This one saw doesn't really matter. Is there a general rule that works on most saws when trying to get the rpm up little. For example, I have a new Echo 490 that came set from the factory at 11,400 rpm. I did a muffler mod on it and now its at 11,600. Iwould like to

[QUOTE="Ronie, post: 6808125, member: 154222] The question is, what controls how high a saw will rev? Any help would be appreciated.

Any one of 'fuel,' 'spark', 'compression ' or 'timming '

Is your spark blue or yellowy orange?[/QUOTE]
I'll check it in a little bit.

 

[Ronie]

What I'd really like to know is what limits the wide open rpm? Like is it when the transfers open or something else? I'm talking just about the cylinder, I understand that the carb can limit the rpm. This one saw doesn't really matter. Is there a general rule that works on most saws when trying to get the rpm up little. For example, I have a new Echo 490 that came set from the factory at 11,400 rpm. I did a muffler mod on it and now its at 11,600. I would like to pull the jug and do some mild porting and get the rpm up. Like it is I'll probably never use the saw.

 

[Westboastfaller]

(ok..posted before a read)

Right ! Because of the shorter piston skirt it is already 'ported'. Why do a flat top? They are all good to. IDK about 268 but 266 open skirt is no transfer work or chopping of cylinder. Keep that factory lip on and use a narrow 'sander on the spike about 3/8 match up then tip it into
the corners as' far as you can go'. would be max 1/4 " wide shallow channel at the end. Exhaust ? I know Simon took a chuck out of the roof and some out of the bottom. I could fit my pinky first knuckle through. F w i w .
Said he dynoed 8.2 hp on his site?
Not use what configuration that was?
That's how he did the single ring.
I have done a few

 

[Westboastfaller]

It's hard to see on my phone but you ground the side flush off the cylinder

that's your problem. You can do that with a stock piston but not a short skirt. That's why it's over fueling.

I will call in a couple friends that are pros but...I am pretty sure about this.

 

[Westboastfaller]

@mdavlee @huskihl

post above please young studs^^

 

[Ronie]

It's hard to see on my phone but you ground the side flush off the cylinder

that's your problem. You can do that with a stock piston but not a short skirt. That's why it's over fueling.

I will call in a couple friends that are pros but...I am pretty sure about this.

Are you talking about the skirt at the bottom of the cylinder?

 

[cuinrearview]

Subbed for some good discussion.

And +1 on the slowing down

 

[Westboastfaller]

Are you talking about the skirt at the bottom of the cylinder?

Yes Sir, I am.
You will need to run a stock piston on it.
or a diff jug on that piston. Way over fueled.

 

[Westboastfaller]

Subbed for some good discussion.

And +1 on the slowing down

WHAT!.. are you hanging around to watch me make an aazz out of myself again? Haha. I am sure about this saw...And if they get to technical and call me §hit...then I can always come back with.. "I know you are but what am I"

Now that's a real show stopper right there
I won't be eased with..

 

[Westboastfaller]

Also I am talking about the piston skirt.
Its very short so it has a longer fueling duration. I have copied of a guy that did 1500 of them. And almost 300 in one year of the same. 16 in one week once for one account.

 

[mkinslow]

It's hard to see on my phone but you ground the side flush off the cylinder

that's your problem. You can do that with a stock piston but not a short skirt. That's why it's over fueling.

I will call in a couple friends that are pros but...I am pretty sure about this.

I see that now also. Probably is the problem here.

Sent from my SM-G892A using Tapatalk

 

[Ronie]

Yes Sir, I am.
You will need to run a stock piston on it.
or a diff jug on that piston. Way over fueled.

Thank you for the advice. I have a clone 365 that I'll put that jug on with the stock piston and see what happens.

 

[pioneerguy600]

It's hard to see on my phone but you ground the side flush off the cylinder

that's your problem. You can do that with a stock piston but not a short skirt. That's why it's over fueling.

I will call in a couple friends that are pros but...I am pretty sure about this.

Timing numbers needed, is the piston free porting at the exhaust port? Intake duration likely too long.