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micoulisninja · September 27th, 2014, 07:53 AM

so far most of the work I have done is measuring, comparing and testing...
I used some "outsider" data too, from ZX-6R, aftermarket JE, wiseco and other piston builders either for 250, I-4 kawi 600s from 2000 on and some suzuki 750s
reasons for these choices were
1. piston size and weight
2. cylinder capacity
3. stroke
4. rev limits related to parts' reliability and working stability

so many numbers are coming along... for those uninterested in comparison charts and figures, you can skip that part

_________250 62mm__300 62mm__ZX-6R 66mm__JE 66mm__KIT 67mm__NickTuned

piston______123,6_____117,4_______141,9_______148,2______152,3______134,9
pin_________35,4______31,4________35,4________42,1_______40,8_______35,0
safety_x2____0,8_______0,8_________0,8_________1,0________0,4________0,4
rings________6,6_______6,6_________7,9_________8,4________8,1________8,1
rods_______250,0_____253,4_______250,0_______250,0______253,4______249,6

total_______416,4_____409,6_______436,0_______449,7______455,0______428,0

NOTES: in the "ZX-6R" and "JE 66mm" rods weights are 250's since the pistons can be fit only in the 250 resleeved block, zx6 are from '00 mod (uses identical piston pins and safeties to the 250's) and JE are the high quality forged 12,5 CR mod (reason why heavier)
overbore kit's and my tuned rod weights are stock 300 and polished 300 rods respectfully since I am using this engine... take 3-4 grams off total to get 250 values...
differences in my tuned parts are result of rod polishing, piston reshaping and lightening to my specifications...images will follow shortly...
all weights are in grams keep in mind that values may vary from piece to piece due to casting etc but gives an idea of what to expect as far as reciprocating weight is concerned

conclusively my total is definetely much heavier than stock 250's and 300's but still managed to get lighter than every other overbore scenario, believing without weakening anything to a dangerous point...

edit: pistons weight was reduced by additional 0,6 grams after finalising process and accuracy measuring...
numbers on board are corrected...

September 27th, 2014, 07:53 AM	#4
micoulisninja modaholic junkie Name: Nick Location: Athens, Greece Join Date: Sep 2012 Motorcycle(s): 2001 ZX-12R, 2009 ninja 345cc and plenty of others in the past... Posts: 438 Blog Entries: 2	so far most of the work I have done is measuring, comparing and testing... I used some "outsider" data too, from ZX-6R, aftermarket JE, wiseco and other piston builders either for 250, I-4 kawi 600s from 2000 on and some suzuki 750s reasons for these choices were 1. piston size and weight 2. cylinder capacity 3. stroke 4. rev limits related to parts' reliability and working stability so many numbers are coming along... for those uninterested in comparison charts and figures, you can skip that part _________250 62mm__300 62mm__ZX-6R 66mm__JE 66mm__KIT 67mm__NickTuned piston______123,6_____117,4_______141,9_______148,2______152,3______134,9 pin_________35,4______31,4________35,4________42,1_______40,8_______35,0 safety_x2____0,8_______0,8_________0,8_________1,0________0,4________0,4 rings________6,6_______6,6_________7,9_________8,4________8,1________8,1 rods_______250,0_____253,4_______250,0_______250,0______253,4______249,6 total_______416,4_____409,6_______436,0_______449,7______455,0______428,0 NOTES: in the "ZX-6R" and "JE 66mm" rods weights are 250's since the pistons can be fit only in the 250 resleeved block, zx6 are from '00 mod (uses identical piston pins and safeties to the 250's) and JE are the high quality forged 12,5 CR mod (reason why heavier) overbore kit's and my tuned rod weights are stock 300 and polished 300 rods respectfully since I am using this engine... take 3-4 grams off total to get 250 values... differences in my tuned parts are result of rod polishing, piston reshaping and lightening to my specifications...images will follow shortly... all weights are in grams keep in mind that values may vary from piece to piece due to casting etc but gives an idea of what to expect as far as reciprocating weight is concerned conclusively my total is definetely much heavier than stock 250's and 300's but still managed to get lighter than every other overbore scenario, believing without weakening anything to a dangerous point... edit: pistons weight was reduced by additional 0,6 grams after finalising process and accuracy measuring... numbers on board are corrected... __________________________________________________ If noone has tried it before, I will !!! Last futzed with by micoulisninja; November 11th, 2014 at 05:54 AM.