Custom 70cc engine build

Is it worth it or stupid?

  • YES

    Votes: 21 63.6%

  • Hell no

    Votes: 2 6.1%

  • Kinda

    Votes: 4 12.1%

  • YES

    Votes: 3 9.1%

  • Nah I'll pass

    Votes: 3 9.1%
  • Total voters
    33
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
So, since nobody has responded to me with a proper answer on the Flywheel, I guess I'm just Gunna send it and order it, see what happens. Also on the piston, I'm Gunna ask Athena to remeasure it for me and confirm what scooter tuning ca has said and what the machine shop said, just for Athena's word on it because I'm EXTREMELY paranoid and since this is a expensive Engine and has been happening for 10+months, might as well be Extra sure. Oh also, I have 5 or maybe 6 weeks to finish this, if not, were moving to Chicago and that would be a total pain in the ass to bring a unassembled engine and Baja on a road trip to Chicago to move. So I want it fully assembled and preferably running by then. I think it's enough time but don't hold me to anything as you know how this stuff goes usually, I'm Gunna try to get it done in 3-4 weeks so I have time to actually break it in and drive it to make sure there's no issues ?. Oh also, this coming Thursday I pickup my stuff from the machine shop hopefully.
 
Last edited:
Z.hb71 said:
So, since nobody has responded to me with a proper answer on the Flywheel, I guess I'm just Gunna send it and order it, see what happens. Also on the piston, I'm Gunna ask Athena to remeasure it for me and confirm what scooter tuning ca has said and what the machine shop said, just for Athena's word on it because I'm EXTREMELY paranoid and since this is a expensive Engine and has been happening for 10+months, might as well be Extra sure. Oh also, I have 5 or maybe 6 weeks to finish this, if not, were moving to Chicago and that would be a total pain in the ass to bring a unassembled engine and Baja on a road trip to Chicago to move. So I want it fully assembled and preferably running by then. I think it's enough time but don't hold me to anything as you know how this stuff goes usually, I'm Gunna try to get it done in 3-4 weeks so I have time to actually break it in and drive it to make sure there's no issues ?. Oh also, this coming Thursday I pickup my stuff from the machine shop hopefully.
Click to expand...
Hope you get the flywheel figured out! I don't know much on these types of engines.
Also hope you get it finished by then, things always creep up sadly just like working on 1:1cars, always a stripped bolt or seized piece that has to drag it along longer. That and with how tight tolerances you are working with here, cant be to careful.
 
so the piston is a poop show in and of itself lol. here's the story, my cylinder came with a 47.54 piston, but it had a 12mm pin, soo I exchanged it for a one with a 10mm pin buuuttttt its a 47.6 as I've said, so I casually go to the Athena website for the part number for the 47.54 pistons with a 10mm pin and what do i find? nothing! it's all 47.6, sooooooo I email Athena (the peeps who make it, not the peeps who I bought it from) bout why is there an "A" 47.6 and an "A" 47.54 and shouldn't they be the same, nothing! complete GARBAGE customer service, so I dig summore and I've figured out 47.54 is an idiotic size, and that this cylinder kits piston is for a Piaggio zip scooter (i already knew that part) and the pistons are interchangeable with Minarelli scooter pistons, soooooo I figure "lets see if any 1 makes a 47.54 Minarelli piston" annnnnd 1 thing shows up, a piston that's exactly what I need!!! buuuuttttttt its discontinued, CRAP! soooo I dig summore and I find a bunch of 47.54 pistons with 10mm pins buuuuuttttttt they are for Peugeot zenith (never heard of that), so I look at Minarelli/Piaggio pistons vs Peugeot pistons, and they do look exactly the same, but looks can b deseiving and im not about to take a shot in the dark. sooooooooo what ill do is ask around and HOPEFULLY, the zenith pistons are exactly the same as Minarelli/Piaggio pistons and ill be able to use it. why does everything I do need to be a pain??
 
Hope you get it figured out! that "discontinued" word always is depressing to see when its on something you need/want...
 
dougstar said:
Most people if it's too hard or something like so what motor is it from..... or model if they can't it get out of a manual they just don't care and could not be asked .
.... very few people will go that extra mile:cautious:
Click to expand...
exactly, and thats what i hate. if its a company u'd think they want to sell u their product but sum just cant b bothered
 
Find out what piston to cylinder wall clearance is supposed to be and than actually measure the piston and bore. This is only way to safely know because you will be measuring what you are using. Not some screwup at the factory of the cylinder bore or the piston manufacturer. trust me have seen it enough on engines we bore. Actually measure what you are using after you find out the clearance you need.
 
crucialRC said:
Give it to the machine shop and let them check everything and tell you whether it will work or not.
Click to expand...
Engine specific machine shop or can any other machien shop do it?
TODD said:
Find out what piston to cylinder wall clearance is supposed to be and than actually measure the piston and bore. This is only way to safely know because you will be measuring what you are using. Not some screwup at the factory of the cylinder bore or the piston manufacturer. trust me have seen it enough on engines we bore. Actually measure what you are using after you find out the clearance you need.
Click to expand...
Ok
 
Too bad your not closer there's a machine shop near me that I use all the time when I build my engines. Richie Machine, good people. These are pics of my Chevy 461 and 406. They did all my machine work and I put them together. They are like mad scientists with their micrometers and calipers.?20150921_161525.webp20141020_180108.webp20141020_182920.webp20150919_155008.webp
 
Ok soooo the machine shop got some things done, the intake manifold, exhuast flange, and clutch carrier.the exhaust and it's mounts will be done Thursday, it was supposed to be done today but the guy wanted to confirm a couple things. For the most part everything was done just as I'd like it, the only thing was the exhuast flange didn't quite line up as well as I'd like to easy fix, and one side on the clutch carrier needs to be filled a bit to clear the chassis, no big deal, I'll do it myself ? I didn't expect it to be perfect as my templates were pretty rough and were made outta cardboard ? but no problem ?. Here's the flange and Carrier. They do Need to be cleaned up. IMG_20190416_151055.webp
(Clutch carrier on the left, exhaust flange on right)
Not as nice as ALX or RCMAX but it will work and that's all that matters ? I think I'll be trying anodizing later down the road and when I do the clutch carrier and intake manifold (not pictured) will be definitely be getting the treatment
 
Last edited:
Z.hb71 said:
Ok soooo the machine shop got some things done, the intake manifold, exhuast flange, and clutch carrier.the exhaust and it's mounts will be done Thursday, it was supposed to be done today but the guy wanted to confirm a couple things. For the most part everything was done just as I'd like it, the only thing was the exhuast flange didn't quite line up as well as I'd like to easy fix, and one side on the clutch carrier needs to be filled a bit to clear the chassis, no big deal, I'll do it myself ? I didn't expect it to be perfect as my templates were pretty rough and were made outta cardboard ? but no problem ?. Here's the flange and Carrier. They do Need to be cleaned up. View attachment 50906
(Clutch carrier on the left, exhaust flange on right)
Not as nice as ALX or RCMAX but it will work and that's all that matters ? I think I'll be trying anodizing later down the road and when I do the clutch carrier and intake manifold (not pictured) will be definitely be getting the treatment
Click to expand...
Looks good! Sucks they didn't have the exhaust done but good to know they are taking their time to confirm it's right!
 
Back
Top