Fruecrue 660 build thread

[MustangMike]

I guess the wider you make it the greater your risk. Performance is never free.

Re: Tony's concerns, were there any problems installing the piston???

I'm always relieved when I get them in, which is why I never glue the surfaces before getting the piston started (like Tony does).

Instead, I start the piston into the cylinder, than tie the cylinder up to the handle to give me a little working room, then squeeze the sealer with needle nose pliers (at various angles) to get the coverage I want. Works for me. (Usually, I'm doing it alone, and wishing I had more hands).

 

[Fruecrue]

I had no issues installing the piston. Place gasket, place cylinder bolts, apply ring compressor with a small portion of piston exposed at the top. Support lower end of piston and squeeze ring compressor with one hand, install cylinder with the other.
Cylinder, piston and rings pre-lubed with 2 cycle oil.
I also rolled the motor by hand quite a few times before running.

 

[Moparmyway]

The roof on the cross 660 cylinder I have here is very flat.
If I widened it I would be rounding it a touch.
Problem with that is the plated band

Widening the exhaust port wont affect any part of the band, whether it is or isnt plated

 

[huskihl]

I'd say it caught the floor also. We put so much emphasis on the roof shape that we often overlook the floor.

This is an 034 super. It's ported, but the roof is unchanged from stock, other than being widened

 

[Fruecrue]

Widening the exhaust port wont affect any part of the band, whether it is or isnt plated

I think he was referring to the need to cut the band to regain original timing after modifying the exhaust roof.

 

[Fruecrue]

Any chance I had a ring gap issue?
Anyone know what it should be?

 

[Mattyo]

yikes man, that hurts.

i'm doing some poor mans porting now....with video on the 54mm ft cylinder... we shall see what happens

 

[huskihl]

Ring gap should be .008 - .040" per husky guidelines. I change them at .020

 

[Fruecrue]

Ring gap should be .008 - .040" per husky guidelines. I change them at .020

Thanks.

 

[Fruecrue]

Measured ring gap with a new set of caber rings.
.009"
Probably not my cause of failure.
Back to being my fault.

 

[Fruecrue]

New cabers

Cabers out of busted saw

Notice any difference? Do the used rings look to be peened or crushed at the tool marks?
Can't tell myself.
I'll probably open the new set to .020" to be cautious.

 

[Fruecrue]

 

[Fruecrue]

Cleaned up and back together.
Same jug, original cross piston with the casting flaw.
Runs.
Pulled some noodles with a 25" bar after 10 minutes of idling.
I'm hesitant to piss rev it. But ive seen 14,700 on the tach very briefly. Can't seem to Richen it up. It'll turn 14,400 3 turns out on the H screw.
Running a walbro WJ-76-1.

 

[dall]

dave there should be another piston there tomorrow

 

[Fruecrue]

dave there should be another piston there tomorrow

Your generosity is pretty unbelievable.
So is your piston stockpile. Thank you Dallas.
I sent you a little something as well.

 

[dall]

i didnt want anything i told you that

 

[Fruecrue]

i didnt want anything i told you that

I know. You're not going to want what I sent you either.

 

[Fruecrue]

Did you hear, I won the 550xp giveaway today!

 

[Stihl working Hard]

The good;

Sounds great Dave nice job there

 

[Stihl working Hard]

Did you hear, I won the 550xp giveaway today!

I knew it wasn't me