Mastermind Meets The Dolmar 7910

[Fire8]

Low top. I like them better myself.

The high top looks a hell of a lot bigger.

That's cool I just know by the time it gets to okla it be FAST and LOUD

 

[Mastermind]

That's cool I just know by the time it gets to okla it be FAST and LOUD

I never rush on building a saw.......that makes me slow........but my work is crappy so it's OK. :msp_biggrin:

 

[SawTroll]

A 7910 with the HD filter will run too rich and not come up to RPM. Haven't tried the HD filter on a 7910 with 7900 muffler yet.

.......

That sounds like the HD setup flows less air than the standard one - but can't you just lean out the H setting of the carb a little?

 

[166]

That sounds like the HD setup flows less air than the standard one - but can't you just lean out the H setting of the carb a little?

I believe it has more to do with the carb intake elbow than the filter. Would not open up with the filter off no matter where the carb was adjusted. Only tried it on one 7910 but after switching back to the stock filter it ran fine? I have a 7910 here with a 7900 muffler on it and i'll have to try the filter on that saw and see how it works.

 

[Termite]

I never rush on building a saw.......that makes me slow........but my work is crappy so it's OK. :msp_biggrin:

Like the boys on Duck Dynasty say , if you don't know what you are doing do it fast.

 

[Plan-b]

Here's where it gets different......

That looks to be a reverberation ridge.[/QUOTE]

I am going to correct myself upon thinking about this...

It's called a reversion dam

It's to prevent re-entry of the exhaust gas.

You keeping it?

 

[parrisw]

Did anyone notice the RPM rating on the flywheel? Says Max 13,500, does that mean the flywheel will explode over that!!! LOL

 

[ckelp]

and that's why we have a test monkey on bored.. so none of us get hurt

randy, have you tried tig yet?

 

[like2surf]

slow

I never rush on building a saw.......that makes me slow........but my work is crappy so it's OK. :msp_biggrin:

Yah! You may not do good work, but your sure slow?

 

[Duke Thieroff]

I never rush on building a saw.......that makes me slow........but my work is crappy so it's OK. :msp_biggrin:

So are your stickers!


Did you get new ones yet?!?!



Just kidding you buddy!

Duke

 

[russhd1997]

21 people on this thread as I type this!!!
Looks like there were several that were "in need of a good read"!!!


Mike

27 now.

Don't know if it's members looking for a Mastermoobs Meets thread or if it's a bunch of Dolmar fans. Could be both! :msp_smile:

 

[Mastermind]

That looks to be a reverberation ridge.

I am going to correct myself upon thinking about this...

It's called a reversion dam

It's to prevent re-entry of the exhaust gas.

You keeping it?

It's not a reversion dam.......though I've done that style of exhaust. It mates up to this...

And that is now gone so the exhaust port has been reshaped to fit correctly.

 

[Mastermind]

and that's why we have a test monkey on bored.. so none of us get hurt

randy, have you tried tig yet?

Nope. I want a tig welder pretty bad......next up is a mini mill though. I use a BADP (big ass drill press) and a milling table to do light milling with......it's really slow because it's not stable enough to take more than a .020 cut. I've got to get a better setup.

So are your stickers!


Did you get new ones yet?!?!



Just kidding you buddy!

Duke

I like my ####ty stickers. :msp_sad:

 

[ancy]

**** 5 pages to go back and read through!

That's what I get for taking a night with the family!

 

[Plan-b]

It's not a reversion dam.......though I've done that style of exhaust. It mates up to this...

And that is now gone so the exhaust port has been reshaped to fit correctly.

Yeah, that snout makes it useless.

I have to say after they revise that muffler and put a cat in it, thats what that it wil probley be. Cheeper and easyer to change tin then castings.

Good Stuff

 

[nstueve]

subscribed

Although looking through the thread, I don't see why everyone was telling me not to clean up my 7900 transfers... Looks like Randy is opening and cleaning his on the 7910. I'd still like to know when the AM is going to make us unlimited coils for these saws!

 

[Mastermind]

subscribed

Although looking through the thread, I don't see why everyone was telling me not to clean up my 7900 transfers... Looks like Randy is opening and cleaning his on the 7910. I'd still like to know when the AM is going to make us unlimited coils for these saws!

The 7900 can be a tricky saw to port. They have a small crankcase volume in relation to displacement. Raise the transfers too much and they get really peaky in big wood. I open the lowers just enough to unshroud them.....nothing but smoothing with a diamond burr has been done in the tunnels.

Port timing numbers off the top of my head.....

Ex: 99
Tr: 128
In: 82

 

[SawTroll]

That's what I get for taking a night with the family!

Well, I'm still on page one - you can change how many posts you have on each page - I mostly use 100..... :msp_wink:

 

[SawTroll]

subscribed

Although looking through the thread, I don't see why everyone was telling me not to clean up my 7900 transfers... Looks like Randy is opening and cleaning his on the 7910. I'd still like to know when the AM is going to make us unlimited coils for these saws!

Don't trust everything you read, not all advice is good advice! :msp_wink:

 

[ckelp]

Don't trust everything you read, not all advice is good advice! :msp_wink:

hell all of my saws run stock coils, the only one i've have problems with is the wildthinggey it's set at 11.5K for some unknown resin maybe there not designed to be returned by an idiot..