Project Stumpbroke Makita 7900

Stumpys Customs · Mar 28, 2012

I finally got my turn at molesting one of these for a local guy. It came to ma as a tired ex-rental 6401.
[video=youtube_share;lTKmDSZwYmY]http://youtu.be/lTKmDSZwYmY[/video]

It will be receiving a new OEM 7900 top end with the new slab sided piston, HD filter setup, and of course a sticker. :laugh:

ndlawrence · Mar 28, 2012

opcorn:

Stumpys Customs · Mar 28, 2012

SInce I'm a lil cramped for room. My parts washer lives outside. After cleaning I put all of the small stuff in a small plastic shoe box & the big stuff goes in an 18 GAL tote. This helps me keep everything together.

Stumpys Customs · Mar 28, 2012

ndlawrence said:
opcorn:

Save some poopcorn fer me

ndlawrence · Mar 28, 2012

Stumpys Customs said:
Save some poopcorn fer me

Will do! I'm still waiting on a thread like this :laugh:

:hmm3grin2orange::chainsawguy::hmm3grin2orange: :laugh:

mt.stalker · Mar 28, 2012

Stumpy , r u gonna massage the ports / timing a little ?

Hedgerow · Mar 28, 2012

mt.stalker said:
Stumpy , r u gonna massage the ports / timing a little ?

Stumpy will port anything that sits still long enough for him to do it...
:big_smile:

Got a 23.2 on the stock cut...

jerrycmorrow · Mar 28, 2012

opcorn:

Stumpys Customs · Mar 28, 2012

ndlawrence said:
Will do! I'm still waiting on a thread like this :hmm3grin2orange::chainsawguy::hmm3grin2orange:

Patience my boy. I'm workin towards it. Just enjoy yer poopcorn:msp_biggrin:

mt.stalker said:
Stumpy , r u gonna massage the ports / timing a little ?

That's the plans :rock:

specter29 · Mar 28, 2012

opcorn:

Adirondackstihl · Mar 28, 2012

You guys can have the popcorn, I'm gonna have a couple beers......:beer: :beer:

mt.stalker · Mar 28, 2012

The more I see this conversion done , the more I yearn for one !!! :dizzy:

sarahdodgegeek · Mar 28, 2012

Doesn't look THAT tired- or yer just a good cleaner.

I think Andy said something about me getting a ported 7900- Too bad I'm not local.

Maybe If its still there in a couple weeks I can snuggle with it a little when we visit.

sunfish · Mar 28, 2012

Get-er-done! :cheers:

ptjeep · Mar 28, 2012

Is there any weight difference between the 6400's and 7900's? I know almost nothing about Dolkitas.

ndlawrence · Mar 28, 2012

ptjeep said:
Is there any weight difference between the 6400's and 7900's? I know almost nothing about Dolkitas.

I would assume the 7901 is slightly heavier, If I understand right the saws have the same case, crank, carb, just a different P&C

Stumpys Customs · Mar 28, 2012

Here's the two cyl side by side.

I can see what they say about these having low case volume.

The first thing I needed to do was mark the piston at TDC on the ex floor to see how far I'll be able to drop the cyl. Since I'll be cutting the squishband.

Stumpys Customs · Mar 28, 2012

ptjeep said:
Is there any weight difference between the 6400's and 7900's? I know almost nothing about Dolkitas.

I should of weighed the P&C's to see what the height diff was since that is the only difference between the two.

Philbert · Mar 28, 2012

Thanks for the clear photos (and for the clean saw so that we can see things!).

Tried to rep you, but . . .

Philbert

Stumpys Customs · Mar 28, 2012

Here's the stock numbers for both cyl's.

6401
EX 144*
TR 96*
IN 146*
BD 24*
Sq .021"

7900
EX 150*
TR 96*
IN 156*
BD 27*
SQ .021"

Here it is all layed out ready to grind.

Project Stumpbroke Makita 7900

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