The best you can do with this KM-3 engine from lawn mower would be carving side seal grooves to have it in both sides, with the original arrangement, only if the rotor side with no seals faces down, can a good CR be achieved.
Hey from New Zealand ,cool little rotor motors ,Iv rebuilt a few Mazda 12a and 13b rotors over the years ,very interesting intake port and its timing and little air gaps in the rotor for cooling ,side port exhaust like a RX8,great vid
I bought one of those new and have it mounted on a 18inch Lawn Boy deck. Very few hours on it due the junk Italian magneto. The ignition coil has the condenser built into it and it's kaput. When I have the time, I think a Tecumseh/ Phelon ignition coil might work in this application with the external condenser, to restore a hot spark.
Hey Liam, you left a question on my channel about a year ago...and I stupidly never looked at your channel after replying :) Great to see this info here, as you say, finding any good info on the sachs wankels is pretty difficult. Mine is a KM37, looks very like the one one your bench in the lawnmower vid. It came out of a British Cymbeline radar-unit which was towed behind a jeep, the KM37 powered a generator for the radar power. Sadly it didn't have the gearbox or any other attachments. They discontinued that model around 1970...I've had it running, but It's still missing the flywheel, I did eventually manage to get all the dimensions for one, so will have to machine it. As it's setup to run as a generator it's got a clever self-regulating RPM govenor, using the airspeed produced by the cooling fan (I may have been a bit brash removing all that, but plan to fit a better throttling carb...if you have any suggestions?) I bought it for peanuts from an ebay auction, and felt very guilty when picking it up as he clearly knew it was worth a lot more. I have a few documents on that model if you wanted them...but I'm thinking you probably have far more info than I do :)
@@everythingexe HI liam i have a hard time finding a full list of all sachs wankel engines and their specifikations / production periods. Do you have anything of that sort? Also id love to have the manuals and parts list for the km914 and 914a. Thanks in advance, great video!:)
Hey man, not to experienced with these. Reassembling my km3 and was wondering if there is any timing of the rotor to the eccentric shaft when it goes in? Or does it not matter? 😅
hey mate some times ago i bought a dissasembled km3 but the owner didn t have the side seals and side springs, where did you get your new seals? nice video btw , will apply your tricks for ignition when i will rebuild mine and let s hope the ignition gets back to life
@@everythingexe I got a 1972 Grass Cat with same engine, but no spark. Cleaned connectors and ensured magnets are working. New plug, and the ground kill switch is not making contact, any ideas? Hoping it's not a bad coil pack 😥if it is, do you know where I can get one?
@@everythingexeThe Sachs-Dolmar Chainsaw had same basic engine, with Side seals in both sides of Rotor, allowing to work in any position, but spare Rotors for this Chainsaw are very difficult to find. The Lawnmower had no seals in lower side as it was placed horizontally, Rotor weight was considered enough for tightness. Blessings +
@@everythingexe just curious if there is a consistent place to find seals. I have a handful of 303 that’s are going to need reconditioning in the near future.
The best you can do with this KM-3 engine from lawn mower would be carving side seal grooves to have it in both sides, with the original arrangement, only if the rotor side with no seals faces down, can a good CR be achieved.
Hey from New Zealand ,cool little rotor motors ,Iv rebuilt a few Mazda 12a and 13b rotors over the years ,very interesting intake port and its timing and little air gaps in the rotor for cooling ,side port exhaust like a RX8,great vid
Thanks
Very nice explanation and camera work, great video!
I bought one of those new and have it mounted on a 18inch Lawn Boy deck. Very few hours on it due the junk Italian magneto. The ignition coil has the condenser built into it and it's kaput. When I have the time, I think a Tecumseh/ Phelon ignition coil might work in this application with the external
condenser, to restore a hot spark.
I have had issues with ignition coils too
Great build guide.
Hey Liam, you left a question on my channel about a year ago...and I stupidly never looked at your channel after replying :)
Great to see this info here, as you say, finding any good info on the sachs wankels is pretty difficult.
Mine is a KM37, looks very like the one one your bench in the lawnmower vid. It came out of a British Cymbeline radar-unit which was towed behind a jeep, the KM37 powered a generator for the radar power. Sadly it didn't have the gearbox or any other attachments. They discontinued that model around 1970...I've had it running, but It's still missing the flywheel, I did eventually manage to get all the dimensions for one, so will have to machine it.
As it's setup to run as a generator it's got a clever self-regulating RPM govenor, using the airspeed produced by the cooling fan (I may have been a bit brash removing all that, but plan to fit a better throttling carb...if you have any suggestions?)
I bought it for peanuts from an ebay auction, and felt very guilty when picking it up as he clearly knew it was worth a lot more.
I have a few documents on that model if you wanted them...but I'm thinking you probably have far more info than I do :)
Some anaerobic sealant between the case parts might help with sealing it. That's what they use for 2-stroke outboard engines.
Great video! I’m building a KM3 now for a mini bike and I have a few of the 295s and 303s.
Good luck. Let me know if you need any manuals or anything like that I’ve got them all for all the Sachs rotaries
@@everythingexe HI liam i have a hard time finding a full list of all sachs wankel engines and their specifikations / production periods. Do you have anything of that sort? Also id love to have the manuals and parts list for the km914 and 914a. Thanks in advance, great video!:)
@@magnusgranhj344 shoot me an email ldhughes1375@gmail.com and I can get you all that info
Great video
Thanks and I think I recognize your name from vintage Wankel snowmobile group hah
@@everythingexe, yessiree!
Good
Hi mate
Can i please get the part numbers for the apex, side and corner seals?
Thanks
Hey man, not to experienced with these. Reassembling my km3 and was wondering if there is any timing of the rotor to the eccentric shaft when it goes in? Or does it not matter? 😅
Poggers video
hey mate some times ago i bought a dissasembled km3 but the owner didn t have the side seals and side springs, where did you get your new seals? nice video btw , will apply your tricks for ignition when i will rebuild mine and let s hope the ignition gets back to life
also thanks a lot for the google drive link , very cool
I found them on eBay kleinanzeigen. Km3s show up there often enough. You might be able to find a spare engine. And no problem!
Very informative video Liam. Do you have a PDF if the manual available? Cheers.
This guy did use any lubrication.. wat a mecanic
Bruh I literally slathered it with oil while re-assembling
Hello,
I’m checking in to see what supplier you got those OEM seals + parts from?
Got lucky and found them on eBay
@@everythingexe I got a 1972 Grass Cat with same engine, but no spark. Cleaned connectors and ensured magnets are working. New plug, and the ground kill switch is not making contact, any ideas? Hoping it's not a bad coil pack 😥if it is, do you know where I can get one?
were did you get those new seals?
I think mine will need some in the future (my km3 is on a kart)
Found them on eBay Germany
@@everythingexe thanks
also if the point break but the coil is good use a nova 2
its a points replacer and I have great results on my engine
Thanks for the advice
@@everythingexe no problem
Hello, i want to buy such a motor. Does anyone know where i could find one? I want to engine swap my "project moped" i would love to do that
I have one for sale 708-420-7277
Good job! Are you aware of a way for having side seals on both sides of Sachs KM-3 Lawnmower engine? Blessings +
I have only ever heard of side seals on one side
@@everythingexeThe Sachs-Dolmar Chainsaw had same basic engine, with Side seals in both sides of Rotor, allowing to work in any position, but spare Rotors for this Chainsaw are very difficult to find.
The Lawnmower had no seals in lower side as it was placed horizontally, Rotor weight was considered enough for tightness.
Blessings +
How did you find the engine ? I’ve been trying to find one
eBay Germany
Some of it appear every now and then in used good sites, perhaps searching in the shopping section, for Wankel Lawnmower could help.
Yeah I’ve been looking I have found some but not much…
Viedeo stopped without starting the engine !!!?
You have a hookup for the seals for 303 km914?
What do you need
@@everythingexe just curious if there is a consistent place to find seals. I have a handful of 303 that’s are going to need reconditioning in the near future.
Sadly no I don’t know of any. I have found them popping up on eBay Germany from time to time
@@everythingexe understood. I’ll hit you up
On the fb this evening.
how much hp does this engine make?
Around 3
Where can i buy wankel? Please advice.
Look on ebay kleinanzeigen. There’s a lot on there all the time.
mower looks like a mcdonalds toy