Stihl - My First Conversion is to begin
02-05-2008 | 11:15 PM
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From: Harrisburg, SD
Stihl - My First Conversion is to begin
I know before i can ask for any help i need to let you guys know what im using. Its an engine off an older Stihl FS 66 Trimmer. I dont know the displacement - anyone know?
Would like to keep it a gas burner, and use stock ignition, but the coil is large and heavy. Where do you guys get those tiny ones im seeing in other posts? And magnetos? Can I use a tiny hub instead of flywheel to reduce weight?
I wanna do this right! Money is also tight but can spend a bit - especially if i can find a Pitts muffler for my exhaust [8D]
Also-cant wait to see the look on my wife's face when i tell her i can make a weedeater fly!
Would like to keep it a gas burner, and use stock ignition, but the coil is large and heavy. Where do you guys get those tiny ones im seeing in other posts? And magnetos? Can I use a tiny hub instead of flywheel to reduce weight?
I wanna do this right! Money is also tight but can spend a bit - especially if i can find a Pitts muffler for my exhaust [8D]
Also-cant wait to see the look on my wife's face when i tell her i can make a weedeater fly!
02-07-2008 | 12:23 PM
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RE: Stihl - My First Conversion is to begin
Boy as I recall that motor is 25cc. I also think that it was used on the FS72 & 76 straight shaft trimmers too. By the time you buy the smaller hub, coil etc you may as well just buy an EI ignition. My opinion only.
02-07-2008 | 10:23 PM
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From: Superior,
AZ
RE: Stihl - My First Conversion is to begin
does it look like the one on the left.If so its a 25.9cc.I started this one but need new rings.The one on the right is the 28cc(27.2 actual).Thats a 17x8 prop on it.RTF it weighs 3-1/4lbs.I have a new tach but havent tested it with this engine yet.The 25.9 is suppose to be better and stronger because it comes from the pro-series as ive been told.I have prop hubs or can make you a special one if ya want on my lathe.Ive made a couple 6bolt.If ya have any questions PM me and ill help or just post it back here.Good luck but youll find out that one engine just isnt enough.
02-07-2008 | 10:58 PM
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From: Durham,
NC
RE: Stihl - My First Conversion is to begin
I think I have the same engine and would like to convert it. It doesn't run right now but has great compression. Problem is I don't know where to get conversion parts for it. Does anyone know of a source for the parts or do they have to be custom made? I would like to use an electronic ignition.
Brian
Brian
02-08-2008 | 08:51 PM
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From: Superior,
AZ
RE: Stihl - My First Conversion is to begin
Go to chignitions and see what engines he has parts for.Also try wackerengines.jagengines,carrprecision.Also keep putting your engine in the search feature here on rcu.I do echos and stills basiclly.I have done homelites and ryobis but there not my favorite.
02-23-2008 | 10:19 PM
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From: Superior,
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RE: Stihl - My First Conversion is to begin
Update:Finally bought my new tach,Fromec TNC.My engine from post 3 was running at 7696 WOT,best that i got out of it.After this i richened it up a hair so its at a steady 74-7500.Idle is 18-1900.An apc17x8 is what im using.Its a stock ch ign with no advance set at 26-28 BTDC,dont remember exactly.Transition was very good.Bought this off of ebay for less than 50.00 already converted so i dont know anything about it except it was used.It did not come with the ch ign.Now i need to go buy an airplane.
02-24-2008 | 11:06 AM
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From: APO,
AE
RE: Stihl - My First Conversion is to begin
Ya, I know they were clean. But I work on helicopters for a living and if you think there are not greasy you would be way wrong my friend
01-27-2009 | 11:24 PM
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From: Harrisburg, SD
RE: Stihl - My First Conversion is to begin
ok finally getting back to finish this project. it is a stihl 20cc \ 1.2 cu in. gonna run GloGas! i have a glow plug adapter now and have bought my ceramic engine paint and primer. all excess weight has been removed with grinder and dremmel. it is cleaned like a babys but after a diaper change. It is time to rock n roll...
2 issues.....
[sm=confused.gif]should i make prop hub out of the flywheel or find someone who can make one?
[sm=50_50.gif]the nut that holds on the flywheel to crankshaft is reverse threaded. will that cause a problem.
thanks for any input
robbinsp
2 issues.....
[sm=confused.gif]should i make prop hub out of the flywheel or find someone who can make one?
[sm=50_50.gif]the nut that holds on the flywheel to crankshaft is reverse threaded. will that cause a problem.
thanks for any input
robbinsp
01-28-2009 | 10:59 AM
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From: Harrisburg, SD
RE: Stihl - My First Conversion is to begin
ORIGINAL: av8tor1977
Hey, those hands are way too clean, and no "busted knuckles".... You're not a mechanic yet!!
Just teasing you... Looks good!
Don't let this guy kid you; that's AN Hardware there on his mount....
AV8TOR
Hey, those hands are way too clean, and no "busted knuckles".... You're not a mechanic yet!!
Just teasing you... Looks good!
Don't let this guy kid you; that's AN Hardware there on his mount....
AV8TOR
take a look at these knuckles. (mechanic for the last 12 years)
] Been there, done that too. Hope they heal soon.
01-28-2009 | 06:06 PM
#15
RE: Stihl - My First Conversion is to begin
ORIGINAL: robbinsp
ok finally getting back to finish this project. it is a stihl 20cc \ 1.2 cu in. gonna run GloGas! i have a glow plug adapter now and have bought my ceramic engine paint and primer. all excess weight has been removed with grinder and dremmel. it is cleaned like a babys but after a diaper change. It is time to rock n roll...
2 issues.....
[sm=confused.gif]should i make prop hub out of the flywheel or find someone who can make one?
[sm=50_50.gif]the nut that holds on the flywheel to crankshaft is reverse threaded. will that cause a problem.
Just run the engine backwards with a pusher prop and the threads may not be a problem!!! Not sure on that. Capt,n
thanks for any input
robbinsp
ok finally getting back to finish this project. it is a stihl 20cc \ 1.2 cu in. gonna run GloGas! i have a glow plug adapter now and have bought my ceramic engine paint and primer. all excess weight has been removed with grinder and dremmel. it is cleaned like a babys but after a diaper change. It is time to rock n roll...
2 issues.....
[sm=confused.gif]should i make prop hub out of the flywheel or find someone who can make one?
[sm=50_50.gif]the nut that holds on the flywheel to crankshaft is reverse threaded. will that cause a problem.
Just run the engine backwards with a pusher prop and the threads may not be a problem!!! Not sure on that.
Capt,nthanks for any input
robbinsp
01-29-2009 | 12:05 AM
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From: Harrisburg, SD
RE: Stihl - My First Conversion is to begin
heres some pics.
[&:]thanks for the warning captJohn.
still need to turn my flywheel into a hub, then drill/tap end of crank for a stud for a prop nut. Do you guys think that would work??
thanks
robbinsp
[&:]thanks for the warning captJohn.
still need to turn my flywheel into a hub, then drill/tap end of crank for a stud for a prop nut. Do you guys think that would work??
thanks
robbinsp
02-28-2009 | 01:07 AM
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From: Harrisburg, SD
RE: Stihl - My First Conversion is to begin
Hey all
Got er done. had to find a left hand tap 8mm dia 125pitch.
now can use electric starter to get it tuned up!
will also have to re paint the yellow on the front because i didnt let the paint cure properly before i first ran it. its scuffed up from a chicken stix, fuel etc...
will post a final pic when done with that. now.. to find a bird to put it on, the hunt begins
robbinsp
Got er done. had to find a left hand tap 8mm dia 125pitch.
now can use electric starter to get it tuned up!
will also have to re paint the yellow on the front because i didnt let the paint cure properly before i first ran it. its scuffed up from a chicken stix, fuel etc...
will post a final pic when done with that. now.. to find a bird to put it on, the hunt begins
robbinsp
06-10-2010 | 11:37 PM
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From: Harrisburg, SD
RE: Stihl - My First Conversion is to begin
okay. heres the latest news from stihl airplane engine fanatic. sold the gas/glow at auction and was able to fund a cdi ignition unit. luckilly, i had another trimmer engine haqnging around. its off the same model weedeater. heres some pictures. what a fun project.
my next conversion will be a rear carb stihl 30cc! THANKS FOR ALL THE HELP.
my next conversion will be a rear carb stihl 30cc! THANKS FOR ALL THE HELP.
