GaGeeBees

My Feedback: (23)

Nice. That .72 is a good match for the Cub. Good landing!

Rudolph Hart

You greased her in beautifully mate,sounds good too.

PacificNWSkyPilot

My Feedback: (19)

Greased it! (Flew by first, though!) hehehe

Jim

ram3500-RCU

My Feedback: (221)

I have a fly by also.

http://www.youtube.com/watch?v=nb6F2U4s78Y

PS.....thanks for the fix on the link Mr. moderator.

beaver180

My Feedback: (10)

Nice one ram,

Here's my Saito 180 105 inch Citabria doing a touch 'n go at Lake Forsyth ( You were right OF, Banks Peninsula )... Prop used is a Mas Classic 18x6. Turn your sound up

http://www.youtube.com/watch?v=wEyzz...eature=channel

Rudolph Hart

Hi ram what kind of exhaust system are you running?

GaGeeBees

My Feedback: (23)

Nice Citabria. Love those big, throaty sounding Saitos. The 1.80 is a great runner. Here's a short vid of my 1.70 radial powered Monocoupe.

http://www.rcuvideos.com/video/Monocoupe-wmv-2

ram3500-RCU

My Feedback: (221)

All stock parts but I prefer the cast vs. the spun aluminum Saito mufflers. I find I have less problems with them coming loose. Also, no extensions or other mods. I have found them to be problematic on my Saitos.

I will be trying some Tuboheaders on my P-38 and will be posting a video of them in use as soon as I can. I plan a fly-by as stock and then another with the 'turbos' for comparison of sound.

flyingagin

Looks like a fantastic site to fly. The pond got my attention. I using Google Earth to find a pond site reasonbly close to me.
Great looking bird. Love that sound. Nice job handling the wind.

ram3500-RCU

My Feedback: (221)

Nice video (good camera work) and a nice flying site.

JustErik

I know the answer must be in this thread somewhere, but 601 pages means the search is pretty useless, so here I am. I'm replacing the cylinder on mu 'hunnert and am preparing to pull the valves. I see the c-clip on top of each valve but am not sure how to remove it. Is there an easy way to pry it open just enough to slip it off? Is there anything else I need to be aware of before proceeding?

Thanks!

w8ye

My Feedback: (16)

Remove the cylinder assembly
Cut yourself a big dowel or use a screw driver handle with the shank in a vice
Set the cylinder assembly down over the device used to hold the valves closed while you push down on the edge of the spring and slide the clip out.

w8ye

My Feedback: (16)

That was the easy part.

On a high time engine, the tops of the valves are peened over and you cannot get the spring retainer up over the top of the valve

You have to take a small honing stone and remove the peened area from the very top of the valve that is preventing the retainer from coming off.

In addition these valves will not come out of the head without removing the peened area.

You can drive them out but that will ruin the guides in the head. If the head is bad anyway, it doesn't matter?

But the peened valves will ruin a new head and must be cleaned up before assembly

JustErik

w8ye, thanks! That worked perfectly. Do I need to do anything to clean or resurface the valve's seating surfaces? And since I'm keeping the head as a back-up what about the mating surfaces in it?

w8ye

My Feedback: (16)

Be very careful of the valve seats in the head. They are just chromed aluminum. They will last a lifetime if left alone.

If that chrome gets a scratch through it, the head is toast. The exhaust valve will melt its way down through the head.

JustErik

So just leave the head alone? What about the valves themselves. Can I cook them in antifreeze overnight or perhaps hit them lightly with a scotchbrite pad? Or should I just leave them alone also? This is the first time I've had a 4-stroke this far apart and since it's this torn down, I figure I should do whatever needs to be done to ensure peak performance. Any hints or tips appreciated.

old n slow

A quick question. Are the carbs reversable? Asking about the 72fs.

w8ye

My Feedback: (16)

The needle can be on the left or the right side

Unfasten the two Phillips screws and swing the carb out to the left - twist 180 degrees and swing back into position.

N1EDM

My Feedback: (2)

Another thought to add to the ones already given... surround the working area with an old white towel or sheet, etc. That way, if/when the circlip goes "Ka-TING" and flies off into Never-Never land, you have a fighting chance at finding it again. Please don't ask how I came to this conclusion!! [sm=tired.gif]

Bob

w8ye

My Feedback: (16)

You can also do it inside a clear plastic bag. When it pops off, you have it in the bag

w8ye

My Feedback: (16)

You can clean the valves themselves

The intakes usually just need to be wiped off.

The exhaust valves could stand to be cleaned. A non abrasive method like the crock pot would be nice. You may have to get serious with the Scotchbrite on the carbon on the stem? Go easy on the seat surface! It should be clean already?

JustErik

I was lucky enough to get them both off without losing them. However, I think I'll use the bag idea when I reassemble them. Right now I'm using some Dawn Power Dissolver and q-tips to clean the valve seats in the head and the valves themselves. After a couple of applications, everything is cleaning up nicely. Thanks for all the help, guys.

w8ye

My Feedback: (16)

Sounds good

If you are happy - so are we

Enjoy

N1EDM

My Feedback: (2)

Great idea, Jim. Wish I'd thought of that. Thanks for the tip.

Bob

ram3500-RCU

My Feedback: (221)

Ditto. I thought this was a great tip as well. Lots of great stuff in this thread. Thanks to all contributors.