Spuds Porting and Tuning Thread

[burrell_]

See much better way of putting it

I understand spud i always enjoy reading your indepth post :thumbup1:

[spudulike]

See much better way of putting it

I understand spud i always enjoy reading your indepth post :thumbup1:

 

They hurt my head:lol:

[div_h]

See much better way of putting it

I understand spud i always enjoy reading your indepth post :thumbup1:

 

2nd that:thumbup:

[Old Mill Tree Care]

My Stihl Red Eye 066 - for those that have been following my progress - it was acquired after the coil went bad, the flywheel is keyed completely different from standard, I tried re-keying it and damn near blew the thing up - far too much advance.

 

I then applied a bit of science taking pictures of the dual key flywheel, drawing lines over the keys and measuring the angle. I recently had an 064 in and managed to measure off the difference it had on the keyway to my standard flywheel and bingo - 52* as I had on the images so filed out a big key, fitted a new key in the crank and used JB weld to form a new keyway.

 

I ended up bang on the 54* I wanted - that is standard + 2* advance - it will kick like a mule once the compression is up but should be bang on as far as ignition timing goes.

 

Next job is to machine the base and pop up piston - there is a big fat base on this cylinder so will see if we can get 0.75mm pop up and then adjust the ports and transfers!

 

That can be your next job after you've fixed my sorry 395xp!

 

Hahaha!!

 

 

Sent with my iPhone from me, to you!

[Eddy_t]

Well, I ran the 357 I ported today and I have decided everything without warranty now needs special treatment, it's a whole different animal! The plug is the rich side of coffee coloured, but the carb won't lean out any more! (Yes, I did trim the stoppers off, before anyone asks!)

 

 

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[burrell_]

Porting bug has bit hard the 357 ported is one hell of a saw

[Eddy_t]

Porting bug has bit hard the 357 ported is one hell of a saw

 

Yup, next on the list is the 385, but I'll send that one away, I'll do my 051 as I have a few ideas for it, as the underside of the cylinder leaves a huge area to play with! Shan't play with the 090, that has plenty of compression and power!

 

 

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[spudulike]

Well, I ran the 357 I ported today and I have decided everything without warranty now needs special treatment, it's a whole different animal! The plug is the rich side of coffee coloured, but the carb won't lean out any more! (Yes, I did trim the stoppers off, before anyone asks!)

 

 

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Looks like you have found out that the people who say to richen the saw after porting, really don't know what they are talking about.

 

The extra flow through the carb is increasing the fuel being pulled up through the main check valve - try moving the metering arm toward the carb body by 0.5mm - it will lean it down a bit and may help - if the saw is done well it should pull 14500 - 15000rpm quite OK.

 

It may be your saw has a worn H adjuster - my 346XP did similar but could get it up to 15,000 with the carb on 3/4 turn H screw.

[Eddy_t]

Looks like you have found out that the people who say to richen the saw after porting, really don't know what they are talking about.

 

The extra flow through the carb is increasing the fuel being pulled up through the main check valve - try moving the metering arm toward the carb body by 0.5mm - it will lean it down a bit and may help - if the saw is done well it should pull 14500 - 15000rpm quite OK.

 

It may be your saw has a worn H adjuster - my 346XP did similar but could get it up to 15,000 with the carb on 3/4 turn H screw.

 

I find that a saw needs richening after a muffler mod, but it definitely needs leaning after porting. The scary part was I put the 357 against my 560 and a works 560, the 357 was that bit quicker, considering mine was running 8t .325

 

 

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[spudulike]

I find that a saw needs richening after a muffler mod, but it definitely needs leaning after porting. The scary part was I put the 357 against my 560 and a works 560, the 357 was that bit quicker, considering mine was running 8t .325

 

 

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Yup, that is pretty much what we have found:thumbup: