Mastermind Meets The Husqvarna 3120

[Mastermind]

Here we go folks. A brand spanking new 3120....

First things first......this green coil must go.

We replaced it with a 272XP coil.

Then we had Bertrand add a high side metering adjustment screw to the carb. As you can see the air filter base must be modified to clear the screw.

We need to open that up some......huh?

 

[Axlerod74]

Nice.................I see you totally cleaned the bench off for this one!

 

[Bluefish]

Here we go again... Can't wait to see what you are up to this time. Thanks for sharing,
Russ

 

[Mastermind]

This lathe may be small, but it works well for what I do.....

Cut the squish band and shaved .060 from the base.

The squish clearance wound up at .024

 

[Mastermind]

Nice.................I see you totally cleaned the bench off for this one!

We covered the benches with galvanized sheet steel. :msp_wink:

 

[Mastermind]

I didn't make a video of the saw totally stock. By the time I got this big chunk of maple the carb was in Canada. So...here it is wearing a 32" bar, 3/8 LGX and an 8 pin. The engine and muffler are stock at this point but the coil is unlimited and the carb had been modded.

Tuned to 12,200...

[video=youtube;nzSsnYT9st8]http://www.youtube.com/watch?v=nzSsnYT9st8[/video]

 

[srcarr52]

I like the upward turn on the intake side of the upper transfers. Got to get that exhaust rotation happening early.

 

[wigglesworth]

He didn't clean the benches off, it's just that mammoth saw squashed everything that was on it.

Them things are behemoths...

 

[Axlerod74]

Galvanized steel to reinforce the benches..............:lifter:

That's a serious saw!!

 

[Mastermind]

A couple shots of the exhaust.

A lot of chips came outta this beast. I can hardly wait to see how it runs tomorrow.

 

[Mastermind]

A little port matching....

 

[deye223]

as usual bloody nice work randy. cheers:dribble:

 

[young]

so what you like working on more this or 880?

 

[cowroy]

hugh hmmm.....videos must be put up asap opcorn:

 

[Graham99]

Cutting the squish

Hi Randy,

You did well getting that cylinder into your lathe, must have been close under the cross slide.

When you cut the squish and machine the base, how are you coming up with the difference to machine? I am assuming if you took 30 thou off the base, then machined the squish the same it would be a no gain position.

I'll go and do some searches and try and understand this facet some more.

Regards
Graham

 

[Mastermind]

so what you like working on more this or 880?

A saw is a saw is a saw........... :msp_wink:

Hi Randy,

You did well getting that cylinder into your lathe, must have been close under the cross slide.

When you cut the squish and machine the base, how are you coming up with the difference to machine? I am assuming if you took 30 thou off the base, then machined the squish the same it would be a no gain position.

I'll go and do some searches and try and understand this facet some more.

Regards
Graham

The cross slide is at the end of the jug so I just have to clear the mandrel at that point. Also the lathe has been modified to allow the cross slide to back up further from the lathe centerline....that helps with setup as well.

To answer your question Graham. I check squish without a base gasket, then determine how much additional squish clearance I would need to lower the cylinder enough to allow me to get the intake timing where I want it.

On this engine the squish was at zero without a base gasket and I wanted to lower the intake floor about .080"/2mm.

I didn't want to take quite that much from the cylinder base (too much compression) so I cut the squish band to achieve a squish clearance of .085"/2.16mm and then removed .060"/1.52mm from the base. I then had to lower the intake floor a bit further to get the number I was looking for on the intake timing.

Clear as mud?

 

[Trx250r180]

randy , its not the size of your lathe that matters ,its how you use it ............

 

[Mastermind]

randy , its not the size of your lathe that matters ,its how you use it ............

LOL.....I reckon that's the truth. I got a 12" X 36" Craftsman Atlas from Scooterbum that I'm working to restore.

 

[Scooterbum]

LOL.....I reckon that's the truth. I got a 12" X 36" Craftsman Atlas from Scooterbum that I'm working to restore.

You mean I've been tellin' all the girls it's 6 when it really is 12?







Parts on the way.
Did ya' ever run across any spikes for the 357XP?

 

[Mastermind]

You mean I've been tellin' all the girls it's 6 when it really is 12?







Parts on the way.
Did ya' ever run across any spikes for the 357XP?

Yes I did. I just couldn't remember who needed em.