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Post by Steve B on Dec 6, 2020 11:20:48 GMT -5
Nice job Ricardoscooters.
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Post by riccardoitalia on Dec 6, 2020 12:34:01 GMT -5
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Post by 103stroker on Dec 17, 2020 20:14:55 GMT -5
That is awesome, what kind of hardware is that in the last picture? Would love to do the same on my 103cc minarelli! That bolt almost looks like a kick scooter(razor scooter) axle bolt
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Post by riccardoitalia on Dec 24, 2020 9:54:59 GMT -5
That is awesome, what kind of hardware is that in the last picture? Would love to do the same on my 103cc minarelli! That bolt almost looks like a kick scooter(razor scooter) axle bolt I have cut and re-tread the original hardware and yes the nut Is from roller☺️
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Post by riccardoitalia on Dec 24, 2020 9:58:12 GMT -5
Ready for tune trasmission and carb!
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Post by riccardoitalia on Jan 23, 2021 14:04:33 GMT -5
Hi! Finally i have tube and ride the "big block". Mine setup D54 cilinder TWH 176 degrre exaust 115 Port 12,3RDC 1,15 SQUISH 43MM crank Ported case 17,5phva 105 main jet 40 pilot Top Red CDI analogic V8 pipe Pinasco vario Top pulley 15/41 Gear. I saw 92km/h @ 8650rpm. Now i want more... Someone try to enlarge the transfert likes in picture? Mine exaust doesnt Open all at bottom dead but Need more or less 1mm gasket Is It standard??? Thanks!!
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Post by 190mech on Jan 23, 2021 19:06:32 GMT -5
You should try to get 190 degrees exhaust duration and 130 degrees transfer duration with the piston even with the bottom of the transfers at BDC.That might be hard to achieve as that cylinder was likely designed for a 45mm stroke..Try for a 1mm squish(or less) also..To get this the cylinder base may need to be machined,etc...
A 21mm carb too!!
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Post by riccardoitalia on Jan 24, 2021 8:49:30 GMT -5
My Plan Is 118/120 transfert and 182/185 exaust and a Little bit more RCD(12,6-12,8 squish 1mm).maybe Whit 1mm spacer Is Better for Open all the exaust Port. Mikuni vm20 carb Is on fly. Now Is really a torque Beast, i font want Lost the "Newton" what do you think? Also Need to balance the crankshaft for the pistone..
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Post by riccardoitalia on Jan 24, 2021 9:03:53 GMT -5
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Post by 190mech on Jan 24, 2021 18:37:43 GMT -5
Adding a 1mm spacer will help,but the squish will be hard to get correct..I have tried cutting the top of the cylinder deck down and also cutting a step in the head to get the squish right..Both methods resulted in a leaking cylinder to head joint due to thinning of the cylinder or head which caused them to bend and leak..
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Post by riccardoitalia on Jan 29, 2021 6:34:04 GMT -5
Adding a 1mm spacer will help,but the squish will be hard to get correct..I have tried cutting the top of the cylinder deck down and also cutting a step in the head to get the squish right..Both methods resulted in a leaking cylinder to head joint due to thinning of the cylinder or head which caused them to bend and leak.. Using a late machine? Also Whit gasket?
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Post by 190mech on Jan 31, 2021 16:27:38 GMT -5
Yes,it was lathe turned,no head gasket,just copperkote spray;
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Post by Lucass2T on Feb 1, 2021 6:41:23 GMT -5
Both methods resulted in a leaking cylinder to head joint due to thinning of the cylinder or head which caused them to bend and leak.. How did you eventually work around it?
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Post by 190mech on Feb 1, 2021 10:21:00 GMT -5
I didnt as the cylinder and head design do not allow for metal removal due to crankshaft stroke changes..I have a few new stock 90cc heads I hope to weld up and try to machine something thicker..I have not had any issues when using a 45mm stroke crank builds..
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Post by riccardoitalia on Aug 17, 2021 18:41:40 GMT -5
Working on crank balance, Port timing and crankase volume..
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