Modding the Dolmar 7900

Wesspur
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Sorry guys for the lack of involvement in this thread, I've just been too busy with life lately, and tired. Been getting up at 5am to work out and exercise twice a week and its throwing me off, but I'm getting used to it, got to stay healthy ya know, and with hurting my back twice this year, its no joke. So back to it!!

Anyway the saw is all done, busted my butt the last two days and got it knocked out, not 100% proud of the work this time I kinda rushed it. Just going out now to test it will get a video.

EX now it at 98
Trans is at 126
intake has 161 duration.

I modded the muffler a little without taking it completely apart, just enlarged the stock hole and left the baffle in place for now.

Here is one pic, sorry didn't take much more. Due to spacing the cylinder up the decomp fouled on the top cover so that had to be relieved a bit.

attachment.php
 
parrisw said:
Sorry guys for the lack of involvement in this thread, I've just been too busy with life lately, and tired. Been getting up at 5am to work out and exercise twice a week and its throwing me off, but I'm getting used to it, got to stay healthy ya know, and with hurting my back twice this year, its no joke. So back to it!!

Anyway the saw is all done, busted my butt the last two days and got it knocked out, not 100% proud of the work this time I kinda rushed it. Just going out now to test it will get a video.

EX now it at 98
Trans is at 126
intake has 161 duration.

I modded the muffler a little without taking it completely apart, just enlarged the stock hole and left the baffle in place for now.

Here is one pic, sorry didn't take much more. Due to spacing the cylinder up the decomp fouled on the top cover so that had to be relieved a bit.

attachment.php
Click to expand...

It looks good to me Will. I like those numbers BTW.
 
parrisw said:
Thanks Randy. Somethings not right with it though. Ran it today, ran ok, but checked comp when I got home. Only making 160???? WTF Stock they are much more.
Click to expand...

Is the decomp working properly? I have had that problem in the past.
 
Yeah that's weird. The Solo 681 I just did is blowing 240 now. The crank will be welded in it before it runs again though.
 
Ok, that decomp thought got me thinking, I had to trim the top cover to clear the decomp since I spaced up the jug. Well I went and looked it was just touching in one spot, so I trimmed it a little more, and when I checked comp earlier I had on my big work boots, and when I usually check it I wedge my foot in the rear handle and block the throttle open with my foot, well, it would really fit in there, so this time I had my shoes on, and checking again it managed to pull 185psi, now it will likely come up a bit more then that.
 
Saw looks and sounds great:msp_thumbup:
I don't quite understand what you did, but it looks like it worked well.
 
parrisw said:
Vid finally. Not all that impressive yet I don't think.

[video=youtube;ewJm0pn1prs]http://www.youtube.com/watch?v=ewJm0pn1prs[/video]
Click to expand...

this saw sounds a lot like my xpw ,lot of chain speed ,is that fir ? kind of hard to make out the bark
 

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