Dolmar 64xx/73xx/79xx series, smurfs and solo 665/675/681 thread

[dahmer]

When I first fired up my 9010 I thought I should buy stock in a Middle East oil country, I was going to need a lot of it.

A 9010 can literally pi$$ oil compared to the 64xx/73xx/79xx!

 

[stranter]

Wonder if anyone can ahead some light on this Makita 7900.
Colleague heard a nasty noise while pulling over his saw. Long story short I pulled the cylinder off to discover it had broken at the base! Luckily I had a spare lying about so tried to rebuild, but discovered the crankcase had cracked when I pressure/vac tested it. It appears that the force of the cylinder breaking had also cracked the case.
I ported the original cylinder, so conscious it could be something I did wrong, although never had this problem before. The build was base gasket delete and the lowers were case matched and blended, intake and exhaust were widened and smoothed, but no timing change (other than BGD). I torqued down the cylinder bolts with locktite to spec also.
Any ideas what has happened here? Could it be a casting flaw?

I’ve had another one come in!
This time the saw was completely bone stock, bought new and used production falling for over a year trouble free. Customer couldn’t get it started, so I took a look. Long story short, I pressure tested it and found it leaking from the same spot in the pto side crankcase which is cracked. I haven’t bothered to take the cylinder off to see if that is broken too.
Has anyone else come across this/ shed any light as to what has happened?

 

[dustinwilt68]

Just a couple saws a picked up yesterday.

 

[TreeLife]

I'm jealous!

 

[kingOFgEEEks]

That's one clean smurf.

 

[dustinwilt68]

Never know what is coming in next, the 7300 I am not sure what I am gonna do with yet.

 

[Wilhelm]

Keep her a 73 , You might be surprised!

 

[dustinwilt68]

If I can get the 7910H done I will most certainly be porting the 7300

 

[dahmer]

That smurf looks like it was never used!

 

[dustinwilt68]

Guy said it was started and drained, never saw wood.

 

[dustinwilt68]

I just put these here for a bump

 

[RI Chevy]

Nice looking project Dustin. [emoji108]

 

[WKEND LUMBERJAK]

Nice black 7910.

 

[dustinwilt68]

Thanks fellas, appreciate it!

 

[3browns]

Stealth as hell

Me likey!!!

 

[dahmer]

I just put these here for a bumpView attachment 229735 View attachment 229736

Must be the Darth Vader limited edition.

 

[dustinwilt68]

I call it my blacked out edition 7910, joins the blacked out edition 462. I have a few other models to build for a few customers pair of 394s, 372 for sure.

 

[Lcfd1124]

My first dolmar/ makita. New piston and cylinder got it going. This saw screams

 

[dahmer]

They become addictive.

 

[dustinwilt68]

Yeah a few months ago I had 0, now I have 5 in the 7xxx series