Project Stumpbroke Makita 7900

[Stumpys Customs]

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.

 

[ndlawrence]

opcorn:

 

[Stumpys Customs]

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]

opcorn:

Save some poopcorn fer me

 

[ndlawrence]

Save some poopcorn fer me

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

 

[mt.stalker]

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

 

[Hedgerow]

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]

opcorn:opcorn:

 

[Stumpys Customs]

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:

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

That's the plans

 

[specter29]

opcorn:opcorn:opcorn:

 

[Adirondackstihl]

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

 

[mt.stalker]

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

 

[sarahdodgegeek]

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]

Get-er-done!

 

[ptjeep]

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

 

[ndlawrence]

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]

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]

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]

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

Tried to rep you, but . . .

Philbert

 

[Stumpys Customs]

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.