Mastermind Meets The Dolmar 7910

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166

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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? :confused:

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.
 
Plan-b

Plan-b

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

Dolmar7910024.jpg

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?
 
Mastermind

Mastermind

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That looks to be a reverberation ridge.

Dolmar7910024.jpg


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...

Dolmar7910008.jpg


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

Dolmar7910038.jpg
 
Mastermind

Mastermind

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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?!?!

:laugh:

Just kidding you buddy!

Duke

I like my ####ty stickers. :msp_sad:
 
Plan-b

Plan-b

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

Dolmar7910008.jpg


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

Dolmar7910038.jpg

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:rock:
 
nstueve

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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

Mastermind

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subscribed :D

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

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subscribed :D

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:
 
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