If all goes well I should get a look at quite a few broken Stihl and echo weedeaters this week.
I'm looking for my first Stihl engine to convert to gasser. I have read all the posts I can find on the forums
about conversion. I have gotten a pretty good idea which ones to look for but want to stay away from ones that require alot of
machining to complete conversion. Looks like staying away from left-hand threads would be a good idea also. Are there a lot of LHTs
units out there? Here is a short list I have made: HS-45,FS-74,HT-75,BR550-600,FS-46,G-45. Any others to look for?

Dennis

If I remember the old Echo 23.4cc trimmer engine was an all time favorite but the blowers were generally left hand. I happen to have a blower.

I did see a couple of Echo trimmers.How can you tell if their the 23.4cc size?

They usually had a 2400 in their model number

I have done two Stihls they were both very good. The one below with the short hub is FS65AV. I think it is a leftie thread. It does not matter since I used the crank shaft to secure the prop. The hub is basically a washer. The one that looks like a "real" airplane engine, I forget the model. Stihl is very good stuff. For a good price I would grab up most any Stihl. The displacement should be on the tag fixed to the tool. I would not mess with anything under 21cc. Check and see if they have compression. The only thing that difinitively kills these engines is scoring the piston and cylinder. That happens when lubeless gas is run. IF you can't turn them over pay less. Sometimes the oilseals and berings are shot. This is not normally a big deal to replace them......unless the bearing has spun in the race or the crank has run inside the bearing with the bearing siezed. I run about 30% junk when I buy trash tools. 70% is pretty good for junk. I really wish the local dump would allow salvage. They have dozens of old gas tools awaiting destruction.

In addition to the above, look for carbs with two needles, not a show stopper, but you need two needles with RC. Replacement carbs are readilly available from other engines or off of Ebay.

If you find a 4-MIX, it is a 4 stroke that you mix oil with the gas, so there is no oil tank, or pump or inverted use problem. It was used in the professional line of equipment. If you find one in good condition, I would be interested in getting it from you.

Good luck and thanks if you find a 4-Mix for me.

Sincerely, Richard

I have done two Stihls they were both very good. The one below with the short hub is FS65AV. I think it is a leftie thread. It does not matter since I used the crank shaft to secure the prop.<hr />I have a left hand thread engine. What is your method of securing a hub or flywheel to the crankshaft? Thanks, Capt,n

I don't remember the model numbers and which engine they indicate, but you can look that up online. The Stihl engines are very high quality. The Stihl 27cc engine is a pretty good engine and an easy conversion, but the 25cc engine is better. It is a bit lighter and has more power. The Stihl 4 Mix four stroke engines are fairly light for a four stroke, and make decent power.

Have fun!

AV8TOR

The FS110 and FS130 are 4-mix engines, 32 and 36cc respectively.

A very close fit. Probably some JB weld or some fancy Loctite too.

I believe that is a 20cc engine. My brother has one I converted for him on a Big Stik. Flies and runs great. We had the prop fly off a few times.... Now he is using pusher props and the prop stays on with the left hand threads just fine.

Note that this only works on an airplane with a "square" firewall; no right thrust.... The pusher prop will want to pull to the right, and the right thrust would make it worse. Tractor props turning counter clockwise pull to the left, so that's why some airplanes are designed with right thrust.

AV8TOR

Sorry no 4-mix engines. Lots of older Stihl weed wackers.

Thank you very much for checking.

Sincerely,

Richard