Hey Rysium did you ever get to the 4 stroke ryobi???? did you try the gas/glow mix on it??? I would like to know if it also works on these 4 strokers, what ever happened to your weadeater 25 are you still using the gas/glow mix and did you change the duration timing on the exhaust and intake? it sure did a lot of difference on my engine!!!

No, I dumped the idea of using this engine in my Wilga, because it is to big (to high) to fit inside the cowl. I decided to use Poulan 42 instead. The 42 is still in the chainsaw (cutting some tree ) but when I'm ready I will dig it out.

I wish I have the time. All three 25s are "base" not cut yet. I'm still planing to cut ports in one to see if it helps. I got Seagul Harrier 90 3D last year (still in unopened box[]) and now I think cut Poulan 25 with glow setup can make this plane fly. It just needs to wait for it's turn. My top priority project is to finish gigant Wilga.

This week I'm in Tampa,FL in business - another weak wasted

aeronut: How many guys do you know, run the glow/gas mix? I was wondering, do you guys ever have any dead sticks? Is it zero or just how many flights can you get before engine dies? I myself do not that worry of when the engine is going to die. Do you need onboard glow on some setups? Can you guys post some data on that. Thanks Capt,n

I have a new Poulan 25 (Featherlite) engine and would appreciate a little more detail on porting the exhaust. Are you raising the top, lowering the bottom, or widening the sides and by how much? Thanks, Rich.

Capn... Once mine are all dialed in, them seem to be very reliable. As reliable as on ignition. And with the set up I'm using with a four stroke glow plug and my fuel mix, I'm not using on board glow. The engines seem to idle slower set up this way than on ignition strangely enough.

Give it a try!
AV8TOR

What will the weight be of the Featherlite Poulan?

Ralphbf mine is 1lb 15 oz complete with muffler, engine mount and propeller.

Richard: I took out about 1/16" from the top on the exhaust side and also about 1/16 from the bottom on the admision side; keep measuring with the timing wheel untill satisfied with your desired timing duration increase.

Captin: same here once you set your engine they are very reliable and stable using the same fuel proportions all the time, I am using the new Hobby People's 4 stroke and Big Bore engines glow plug (cheaper $5.50 and runs very good) dont need an onboard system and it idles very low but I like to keep it a little bit on the high side.

Are you sure about 1-15?? I mean 31oz???

My Poulan weights 22.8oz for the engine alone (without prop adapter, muffler, carb, and mount). See my thread [link=http://www.rcuniverse.com/forum/m_3192059/anchors_3192059/mpage_1/key_/anchor/tm.htm#3192059]Step by step converting Poulan 25cc FL trimmer[/link]. Everything all together ready to go (less prop and nut) is 37.5oz - see the [link=http://www.rcuniverse.com/forum/fb.asp?m=3196558]final post in this thread[/link]

I wonder, what did you cut for over 10 oz weight saving?

Well it finally quit raining in California.
I was able to retest my Mac conversion.

16x8 prop at 7300 rpm with no power to the glow.

This was obtained with 1 part 20/20 glow fuel and 2 parts gas.
After 5 minutes of WOT the engine temp was 200 degrees.

Let me also state that the compression of this engine is not what it should be.
That's probably why the extra nitro.

So now that everything is looking so good I'll pick up a new set of rings from Frank Bowman.
And then I'll finally know if it's a 28 or 32cc engine

No kidding It better does. I didn't fly for ages[:'(] I'm comming back from Forida hoping that this weekend will be flyable

Well maybe the weadeater casing is less heavy than the poulan casing some lots are different then others; I will try to take a picture on the scale!!! the other thing my muffler is very small I made it my self using tubular aluminum for window frames which is lighter than other tubular aluminum, that saved me around 2 to 3 oz, kept the hub small and light and the use of an APC prop over Master Airscrew also saves some weight; cut of the coil base permanently and kept it to bare necesities, my mount consists of two 1/2"x 3" strips of very ligth 1/8 aluminum from a chinese made landing gear bolted across the back plate of the engine (I'll try to take some Pic's)

Thanks man, I'm thinking about Harier 3D 90 as a plane for the glow poulan, so every gram will count.

Oh! I'm sure it will work great!!! I had my weadeater 25 on an Modeltech Excite 90 which is similar to the Harrier 90 and it pulled it very beautiful and that was even before I've worked the duration timings on the engine, so I guess if I was to use the same engine on a harrier it would be doing 3D definitely

What type of ignition system would I use if I converted my Magnum 4-stroke to gas?

aeronut: Got a idea. Put a carbon fiber tuned pipe on one of your glow/gas engines. Then let us know how she scoots. Should be interesting!!!! Capt,n

Aero Nut I have a ? My roybi runs on gas /glow w/out heat ,But is real rough I'm using Byrons 10% nitro with 10% oil mixed with 93 octane gas' I raised the tang on the regulator in the carb the mixture is 2 part gas and 1 part glow also using a Zama 13.5mm carb I got Scott Ellingson[Brillelli Engines]. My glow adaptor is from Horizon and I'm using a 4 stroke Plug.
Do you think I need to increase the glow fuel in my mix to keep the plug hotter? I'm at a loss here and could use some help.
Whenever I put the battery heat to the plug the engine smooths right out goog wot and good idle.Thanks for any help you can give.

Gryohead

That 13.5mm carb is a bit large for a Ryobi. Also, the larger carbs flow a bit more fuel stock, and may not need the regulator lever raised, especially when used on a smaller engine. My Poulan 42cc with a 13.5mm carb was blubbery rich after I raised the regulator lever. I put it back to stock and the engine straightened right out. I'm betting you are too rich, and the glow heat is covering it up.

You might also try a different glow plug in case yours is not "happy."

AV8TOR

I agree with bob!!! the 13mm carb is to big you need to stick to an 11mm carb also if you raised the regulator metering lever it will let to much fuel that you'll be overflooding the carb and that it's why it's running rich, I would use AV8TOR'S
suggestions and see how it runs, Did you raise the stop plate on the reed valve to 1/8" to let more fuel in?????

I am not sure about the gas/glow mix, but on a strait gas Ryobi the 13.5mm is not too large at all. It works very well. I use the same carb on my 25cc engines with great results. Good idle, snappy transition, and great top end. Being a 31cc the Ryobi should handle the carb well. But the gas/glow thing may make a difference.

I do think that the meterering lever should be positioned on it's original position due to the fact that the bigger carb has a greater fuel flow; So Gryohead have you made any adjustments yet? what are your results? you should be ready to run and fly!!!!!

Yes I have the reed stop adjusted at 1/8". I also ran this engine on gas with mag ign. and it ran good ,it would idle down and would transition to highspeed very smoothly. I will get to play with it more this weekend and will keep you posted,thanks.


Gryohead

Well guys, I'm pretty pleased with my Poulan 42cc on gas/glow on my Giant Big Stik. The power is a bit less than I thought I'd see with it turning an APC 18 x 8 prop at 8300, but it sure pulls the Giant Stik around well so I'm probably not going to worry about it. The 13.5 mm carb works better than the 11 mm that I had on it. Someday I might get ambitious and put my new Bowman ring in the engine, and perhaps a little bit larger carb. But then again, it pulls the airplane vertically out of sight, and will loop at half throttle so why bother?

No problems or modifications to use gas/glow with this engine. When I put the 13.5 mm carb on it, I rebuilt the carb first and raised the regulator lever a bit. It was running too rich and needed the needles almost closed, so I put the regulator lever back to stock and it now runs perfect.

I really like the Giant Big Stik, but I think the Hangar 9 Ultra Lite Stick 120 was just a touch better at aerobatics. I may change my mind with a few more trimming and adjusting flights however. I like the size, looks, and strength of the Giant Stik better than the Ultra Lite Stik 120, and I definitely like the two piece wing better!!

So anyway, if you have any thoughts of doing "Gas/Glow" with the Poulan 42/46cc engines, it works great.

AV8TOR

How much does your Poulan 42cc weigh.
Did you have to add weight or move weight around in the plane?

I bought a 25cc Toro and I'm looking for a plane to put it on.
I have a running 28 or 32cc Mac that is already set up for Gas/Glow.

AV8TOR: In general...would you say that a engine with more compression (higher ratio) is it going to run better or sames as a engine with a lower compression ratio. I am talking for gas/glow use. what have you found in your experiments as to C. ratio. Would a good name for your fuel be...GLOW-A-LEAN? Thanks Capt,n

I think that a better name would be Gas-anol!!!