Custom 70cc engine build

Is it worth it or stupid?

  • YES

    Votes: 20 62.5%

  • Hell no

    Votes: 2 6.3%

  • Kinda

    Votes: 4 12.5%

  • YES

    Votes: 3 9.4%

  • Nah I'll pass

    Votes: 3 9.4%
  • Total voters
    32
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Gonna give you a heads up here. Like Z found out, building a 70cc is more expensive then buying an rc max or alx. His project has been put on hold due to the difficulties he was having. I'm not trying to dissuade you from doing it if your dead set on your own build. You'll learn a lot about the engine going into your rig. But be ready for many set backs and issues revolving around parts from many different manufacturers, as our friend Z found out.
 
Seandonato73 said:
Gonna give you a heads up here. Like Z found out, building a 70cc is more expensive then buying an rc max or alx. His project has been put on hold due to the difficulties he was having. I'm not trying to dissuade you from doing it if your dead set on your own build. You'll learn a lot about the engine going into your rig. But be ready for many set backs and issues revolving around parts from many different manufacturers, as our friend Z found out.
Click to expand...
Took a the words out my mouth. But hey if you want to build it, to right ahead! I'd like to see you being successful ?
davexie said:
Thanks
BTW any links or part. for force reed mate. I am doing my own building. How to contact you mate？ E mail or messenger is fine. Want to ask u some questions.

Why you buy it just $215
found in ebay for $392
damn expensive
Click to expand...
You can find it on malossi.eu for 215. The reed was an alx part I had to buy directly from alx.
 
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Seandonato73 said:
Gonna give you a heads up here. Like Z found out, building a 70cc is more expensive then buying an rc max or alx. His project has been put on hold due to the difficulties he was having. I'm not trying to dissuade you from doing it if your dead set on your own build. You'll learn a lot about the engine going into your rig. But be ready for many set backs and issues revolving around parts from many different manufacturers, as our friend Z found out.
Click to expand...
Thanks mate
Z.hb71 said:
Took a the words out my mouth. But hey if you want to build it, to right ahead! I'd like to see you being successful ?

You can find it on malossi.eu for 215. The reed was an alx part I had to buy directly from alx.
Click to expand...

Thanks
 
davexie said:
Will make a thread when i ready to build. Thanks for your help
Click to expand...
No problem. Really wanna see your build! What's your plans for parts? I can help you out if need be ? top tip, run gasoline, don't try any other alternative fuels (alcohol, Methanol, e85, ect) , just do normal gasoline or race gas at best. Becuase then you'll go down a rabbit hole with ignition and stuff, it's areal pain and overcomplicates stuff big time. So normal gasoline, makes good power, easy to tune and run, and you'll be golden.
 
Z.hb71 said:
No problem. Really wanna see your build! What's your plans for parts? I can help you out if need be ? top tip, run gasoline, don't try any other alternative fuels (alcohol, Methanol, e85, ect) , just do normal gasoline or race gas at best. Becuase then you'll go down a rabbit hole with ignition and stuff, it's areal pain and overcomplicates stuff big time. So normal gasoline, makes good power, easy to tune and run, and you'll be golden.
Click to expand...
Start with some copying things. I scan my own rcmax case and drawing
 
davexie said:
Start with some copying things. I scan my own rcmax case and drawing
Click to expand...
So your assentially cloneing an rcmax? Ok. You have your own machining equipment or is a machine shop Gunna do it for you? Keep in mind. You might have crank issues, becuase rcmax uses a custom crankshaft, vs the alx crankcase that I used, was meant forna off the shelf crank, so i have no idea if the crank i told you the part number for, will work in your case. Just letting you know.
 
Z.hb71 said:
So your assentially cloneing an rcmax? Ok. You have your own machining equipment or is a machine shop Gunna do it for you? Keep in mind. You might have crank issues, becuase rcmax uses a custom crankshaft, vs the alx crankcase that I used, was meant forna off the shelf crank, so i have no idea if the crank i told you the part number for, will work in your case. Just letting you know.
Click to expand...
I have alx and rcmax also. 2 rcmax and 3 alx engine. I just want to know how it work so I spilt engine and scan case. My rcmax is Ray Dawson era. It's old so I think it can work with my Bzm gold 39.8 crank. I live so close to CNC workshop. So it's easy to make it. Now I am going to make a copy case with minarelli cylinder ( jog 50 use. Very cheap) and Bzm gold crank.
Z.hb71 said:
So your assentially cloneing an rcmax? Ok. You have your own machining equipment or is a machine shop Gunna do it for you? Keep in mind. You might have crank issues, becuase rcmax uses a custom crankshaft, vs the alx crankcase that I used, was meant forna off the shelf crank, so i have no idea if the crank i told you the part number for, will work in your case. Just letting you know.
Click to expand...
I have alx and rcmax also. 2 rcmax and 3 alx engine. I just want to know how it work so I spilt engine and scan case. My rcmax is Ray Dawson era. It's old so I think it can work with my Bzm gold 39.8 crank. I live so close to CNC workshop. So it's easy to make it. Now I am going to make a copy case with minarelli cylinder ( jog 50 use. Very cheap) and Bzm gold crank.
 
davexie said:
I have alx and rcmax also. 2 rcmax and 3 alx engine. I just want to know how it work so I spilt engine and scan case. My rcmax is Ray Dawson era. It's old so I think it can work with my Bzm gold 39.8 crank. I live so close to CNC workshop. So it's easy to make it. Now I am going to make a copy case with minarelli cylinder ( jog 50 use. Very cheap) and Bzm gold crank.
Click to expand...
Ah ok. Yeah the Dawson era ones might use a off the shelf crank. Awesome you have 5 big bores, hope to get there one day myself lol. You probably know, but im just Gunna say it anyways, the Dawson rcmaxs up to the last generation (till they came up with their own cylinder) was made for a piaggio, not a minarelli so you will have to change the stud pattern and the transfer ducts on your case from the piaggio to minarelli Design. In you have the first first gen rcmax like this then yeah it's a minarelli
DSCN2685.jpg
evssv said:
Ray dawson era rcmax?.....any pics of these bad boy engine's dude?
Click to expand...
+1 ?
 
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Z.hb71 said:
Ah ok. Yeah the Dawson era ones might use a off the shelf crank. Awesome you have 5 big bores, hope to get there one day myself lol. You probably know, but im just Gunna say it anyways, the Dawson rcmaxs up to the last generation (till they came up with their own cylinder) was made for a piaggio, not a minarelli so you will have to change the stud pattern and the transfer ducts on your case from the piaggio to minarelli Design. In you have the first first gen rcmax like this then yeah it's a minarelli
View attachment 55092

+1 ?
Click to expand...
The photo you post is 1st gen rcmax. I have the next piaggio cylinder one. Yes I am redesign the transport and bolt position to fit minarelli. It's interesting. The flywheel I mod a rcmk one to fit. Your cdi is good but a little complex. Seems cdi can not work with receiver with the same battery？
dougstar said:
Yes some progress pics would be awsome ??
Click to expand...
Still drawing progress
 

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davexie said:
The photo you post is 1st gen rcmax. I have the next piaggio cylinder one. Yes I am redesign the transport and bolt position to fit minarelli. It's interesting. The flywheel I mod a rcmk one to fit. Your cdi is good but a little complex. Seems cdi can not work with receiver with the same battery？
Click to expand...
The cdi needs a separate battery. Just mod the rcmk flywheel to fit and run that ignition setup, with gasoline it will be fine. The only reason i did mine that way was cause i wanted adjustability for e85. And the rcmk setup is my easier, cheaper, and reliable. If you really want adjustability, spend the money and get a powerspark module.
davexie said:
The photo you post is 1st gen rcmax. I have the next piaggio cylinder one. Yes I am redesign the transport and bolt position to fit minarelli. It's interesting. The flywheel I mod a rcmk one to fit. Your cdi is good but a little complex. Seems cdi can not work with receiver with the same battery？

Still drawing progress
Click to expand...
Question, are you on Facebook? Just curious.
 
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