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Post by Deleted on Feb 4, 2020 15:08:16 GMT -5
Saw this kind of build project in Youtube years ago. Can't find the video anywhere, maybe it was a dream, but It's been rattling in my brain ever since. So ordered some parts and here we go.
Jog 90 chinacrank with SFX bearings in left and Originals in the right
Crank and bearing width difference is -2,7mm total. Looking for shims. Jog 90 crank wheel dia is 78,5mm and af 49 crank case dia is 76,5mm. Also cylinder is jog 54mm.
This is going to be long build.
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Post by repherence2 on Feb 4, 2020 21:01:03 GMT -5
Are you a Machinist?
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Post by Deleted on Feb 5, 2020 3:52:47 GMT -5
No I'm not. So this project can go sideways pretty fast!
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Post by 808ministroke on Feb 5, 2020 4:00:17 GMT -5
I’m making popcorn
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Post by 190mech on Feb 5, 2020 5:13:58 GMT -5
There are lots of stroker cranks and big bore cylinders for the Honda engines,why not use them??
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Post by Deleted on Feb 5, 2020 7:13:40 GMT -5
There are lots of stroker cranks and big bore cylinders for the Honda engines,why not use them?? For af49? In this case cylinder stud pattern is similar with the minarelli. Also measurements suggest that I don't have to do any special machining, all can be done by freehand.
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Post by Zino on Feb 5, 2020 9:10:49 GMT -5
You are Bold to take on this challenge . Take alot of pictures so we can see this project come together.
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Post by 190mech on Feb 5, 2020 19:51:02 GMT -5
There are lots of stroker cranks and big bore cylinders for the Honda engines,why not use them?? For af49? In this case cylinder stud pattern is similar with the minarelli. Also measurements suggest that I don't have to do any special machining, all can be done by freehand. Dont have a clue what an AF49 is,thought its a later AF16!I'm a Chinarelli guy that was handed an AF16 project a while back so I'm waay down on the ladder for Honda builds..I can talk 90cc+ Mina though,,With narrower crank wheel width perhaps attach proper thickness aluminum sheet to both sides of the crankcase with flush headed screws..Decent 54mm Mina cylinders are getting hard to find and all have poor transfer duct geometry resulting in around 10,500 max revs..Keep us posted on this interesting build as you are "wandering off of the beaten path" and "thinking out of the box" at the same time!
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Post by repherence2 on Feb 5, 2020 20:35:48 GMT -5
For af49? In this case cylinder stud pattern is similar with the minarelli. Also measurements suggest that I don't have to do any special machining, all can be done by freehand. ..Decent 54mm Mina cylinders are getting hard to find and all have poor transfer duct geometry resulting in around 10,500 max revs..Keep us posted on this interesting build as you are "wandering off of the beaten path" and "thinking out of the box" at the same time! I totally agree with the "poor transfer duct geometry resulting in around 10,500 max". Never seen more than 10,500 rpm on my 54mm minarelli. Now that im building an AF16/18 clone, it's easy to see why the DIOs can be fast. The transfer duct, when port matched to the case, opens up much more than a minarelli can.
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Post by benji on Feb 5, 2020 23:58:09 GMT -5
..Decent 54mm Mina cylinders are getting hard to find and all have poor transfer duct geometry resulting in around 10,500 max revs..Keep us posted on this interesting build as you are "wandering off of the beaten path" and "thinking out of the box" at the same time! I totally agree with the "poor transfer duct geometry resulting in around 10,500 max". Never seen more than 10,500 rpm on my 54mm minarelli. Now that im building an AF16/18 clone, it's easy to see why the DIOs can be fast. The transfer duct, when port matched to the case, opens up much more than a minarelli can. the dios are fast because they are small haha. Minas are where it's at imo.
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Post by Deleted on Feb 6, 2020 9:36:15 GMT -5
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Post by mrchilled85 on Feb 6, 2020 12:36:32 GMT -5
very nice as long as its not shape and clears fine im sure it will be good
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Post by 190mech on Feb 6, 2020 16:54:45 GMT -5
Be interesting to see ignition,variator and starting arrangement..Keep us posted!
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Post by repherence2 on Feb 6, 2020 21:17:13 GMT -5
Wow, that engine case looks just like my SYM dd50 case.
May i ask why you chose a Jog90 crank? Is it a stroker crank?
Jog90 stock stroke is pretty much the same as stock Honda stroke (probably 0.2mm difference). Locally here on Oahu you can get full counterweight stroker cranks for Honda engines for about $150 at shops or Craigslist.
Full circle crank with 50mm stroke you get 114cc on a 54mm bore. Full circle crank with 52mm stroke you get 119cc on a 54mm bore. A 54mm bore with a 52mm stroker crank would be a Hammer, also just 2mm short of being a "square bore" setup. Stroker Beast. Mate that setup to a big Scorpion pipe, oh boy, Hammah Scoot right there.
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Post by Deleted on Feb 7, 2020 9:25:12 GMT -5
Chinarelli parts are easier to find. This should be that 44mm stroker crank (+2mm).
I think my main problem is in stator side and pipe measurements.
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