I have converted a new Homelite 25 cc and am going to put it in a Sr.Telemaster. My question is what prop size to use on the Homelite?
I have an 18 X 8 on it now and it seems to turn it ok on the bench. Any suggestions?

For one thing you posted in the wrong category.This is why no responses.Try in the engine conversion forum.But right now i have a 16x8 apc on my 24cc echo.Dont remember rpm was at least 7000.I would say a 16x8 to a 17x6.The 18 inch props work better on 30cc.Some engines are getting 7-8000 on 18s but there not homlites.I have an 17x8 on my stihl 28cc and i know im putting out 7200 or better since i last tached it.Post over in the other forum.Im surprised no moderator caught this yet.

ran a 18x6 on mine on the bench and got 8500 rpms or so.

Thanks guys, the mods moved it, my mistake. I think after mounting the engine yesterday that I will try a 16X8 to start, as ground clearance is an issue with a tail dragger. The Telemaster is just going to be flown for sport and slow flying, so I don't need maximum performance. I just needed a ballpark size to get started. Thanks again.

Is that with stock components.I had one but i dont think i was getting that good of RPMS.I sold it just after i converted it so i dont remember the tach readings at all.I did a 30cc homy instead.Im at 3000msl.

Hey, I have a SR. Telemaster running a 25cc Homey on gas/glow. The best prop I have found for this application is an 18x6. On gas a 16x8 is a good starting point. With the big Tele, you have to remember you are not going to rush it. It has a lot of lift, probably wouldnt hurry much faster with a 45cc than with a 25cc. Weight is not much of an issue. Mine was WAY over built by a club member, and flys @ 16lbs. It is still a very mellow flyer. It will fly fine on a 25cc Homey even if it is a mag engine.

I really don't plan on aerobatics with it, I have other fun planes for that. This is just for lazy cruising around the sky and relaxing. I had an O.S. 91 4-stroke on it before and it was slightly tail heavy. It flew ok but wasn't nothing exiting. I am a hobby machinist and thus how this conversion came about. I seem to collect these small 2-cycle engines at an alarming rate and they are allways like new inside. I just found a new Ryobi 31 cc trimmer with a broken string head. The engine is in perfect shape. Lets see, need more planes......

Yeah, I know what you mean, I have a back log of engines needing planes! Being in the small engine business, they are constantly being left with me. I finally had to force myself to leave them alone. I did pull a New Poulan trimmer out of a dumpster the other day. Fourtunatly it was a no oil runner and was toasted, otherwise it would mean another plane! (got some good parts though). You will enjoy your Tele on gas.

Good find, too bad it was burned up. I just wish all these engines had Walbro carbs on them instead of the newer Zama lean burn carbs. With all the stuff laying around, I still have a shortage of good carbs. I am going to modify and run the Zama on this Homelite and see if it will work out. It seems to run lean at full throttle on the bench. If I adjust it to run ok full throttle, then it doesn't transition well. Idle mix is non-adjustable. I guess I really don't plan on running it full throttle anyway.

Single needle I guess. If you have any small engine shops close, ask them if they have any 2 stroke junk (they sure will!!) Look for the older stuff. Unless water has been in the program you can salvage the older Walbro carbs. I have bought as many as 30 pieces of 2 stroke for $10.00, which yeilded all kinds of good stuff!

I have converted several Homelites. The Key is to reduce the resrictions in the muffler and put a larger carb on it, like 11mm. I just welded an exhaust pipe on the muffler, that really improved power. Also, the larger carb. My Homelite could usually turn an 18x8 over 7000rpm on the ground. Thats right at 2hp and 12 pounds of thrust. I found that putting a smaller prop on really did not help increase rpm that much, so I stuck with the big prop. Hope that helps-Lee

From what I have read, it seems like the 11 mm carb is the way to go. I am still kinda digging around looking for a better carb than the Zama.
I hadn't planned on using the original sheet metal muffler, I found an old weedeater intake manifold stub that fits the exhaust port and fits 1/2 in. copper plumbing. I figured on using a modified butane can for a muffler.
I can't believe 2 hp! really? wow. Mine won't come close to 7000 with the 18x8 with the Zama carb. I need to finish the engine instalation in the plane first so I can run the engine again and experiment.

Its easy, 1Hp=6pounds of thrust, FYI, good luck with your project, although a good Walbro or Tilloston will work just as well as a Zama. I like those old Hu series Tillostons if you can find them.

I forgot about the HU series Tillotson. I just rebuilt one for a 12 in. Skil chain saw. Great little carb.

I have modified my Zama by blocking the two holes in the throttle plate and soldering on a throttle arm extension.

I used a nylon aileron belcrank and nylon ball socket links for the throttle linkage. The pivot bolt was threaded into the cylinder base flange and works like the factory put it there.

Now I have to machine a velocity stack.

you can get those zenoah plastic vel stacks for about 2 buckshard to justify machining one when they can be gotton that cheap!

I have to agree, the price is right.
Where do you find them?
I live out in the sticks and don't have any LHS with in my area. I have allways been frustrated with mail order shipping prices and the lack of LHS's so I just machine what I need and be done with it. Doesn't take very long.
Thats how the Homelite conversion got started, too much time on my hands! LOL!