85cc 064 porting

[jmssaws]

Hmmmm. Im wonderin if piston weight is why huskies drop bottom bearings

A 94/5 piston is giant and it hurts them.

I can't get one to run with a strong 066 anymore and I think that's some of it.
They just won't tune as fast and if they did it would be very short lived

 

[Keith Gandy]

Most of you guys probably know but stihl has 2 very different wrist pins,one heavy and one light.
View attachment 35289

Part # for lighter one?

 

[jmssaws]

Part # for lighter one?

No idea but they come in ks 660 pistons
Most older ones have a thick pin

 

[Keith Gandy]

A 94/5 piston is giant and it hurts them.

I can't get one to run with a strong 066 anymore and I think that's some of it.
They just won't tune as fast and if they did it would be very short lived

Thats odd though in that 390/4/5 spool up so quick with the weight

 

[Keith Gandy]

Okay!! Showdown time!! Zerosix4 vs 79double0

 

[jmssaws]

Thats odd though in that 390/4/5 spool up so quick with the weight

I never include a 390 with a 94 or 95
I truly despise them.

066 can spool pretty fast also.

I have no doubt that one of shauns 395s will beat the 066's I do but I can't build a 95 that will.

 

[Keith Gandy]

I got a 390 we will run soon with 2 different 064/066s. Im curious to see the difference noodling

 

[jmssaws]

I got a 390 we will run soon with 2 different 064/066s. Im curious to see the difference noodling

If one of the hybrids is johns new one
The 390 needs to be a 395

 

[Definitive Dave]

The only limited coil for a 64 was on the 066 red light Dd has a thread 064 66 coils and flywheel combos

I think this is correct ?


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almost right, there are different limited coils for the 064 and the 066
somewhere that thread has pics

EDIT: I should have kept reading the thread

 

[Glock37]

How far off is your numbers from everyone else that ports


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[jmssaws]

I think @mdavlee is building stihls that are ahead of his 395's too

 

[Glock37]

almost right, there are different limited coils for the 064 and the 066
somewhere that thread has pics

That info makes my head spin reading it


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[jmssaws]

almost right, there are different limited coils for the 064 and the 066
somewhere that thread has pics

The red light coil has a extra leg for the light. 064 does not
They look the same other than that

 

[jmssaws]

How far off is your numbers from everyone else that ports


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I don't know but I'm sure we're all close.
Way to many other things that determine how one runs.

 

[rocco490]

how about a 064 vs 660 vs a 661 which is strongest for you

 

[Keith Gandy]

If one of the hybrids is johns new one
The 390 needs to be a 395

Im curious to see how this 390 measures up . My 85cc 064 isnt up to par with this 390

 

[jmssaws]

I don't use a set number and never build one the same,the cylinders vary so much I just go with what It gives me.

Low exhaust makes tourqe and a high exhaust makes rpm they sat but I've seen it the opposite.

Fastest tuning saw I've seen had the lowest exhaust and least intake duration than any I've done.
Exhaust at 102.5 and intake at 77 but tunes over 16k

 

[jmssaws]

how about a 064 vs 660 vs a 661 which is strongest for you

064 will run with a 660
I'll have to get back to you on the 661

 

[jmssaws]

Im curious to see how this 390 measures up . My 85cc 064 isnt up to par with this 390

The new hybrid of johns will clobber my 395 with any bar.

 

[Definitive Dave]

064 FTW or wait 066 or maybe 064 with 660 cylinder and 288 piston?