hauser2169 Posted August 23, 2009 Report Posted August 23, 2009 k soi just bought a 4 mill botttom end. how do i know for a fact its a 4 mill. they said its a hotrod4 mill. also what else do i need besides pistons, jetting, porting, and a plate/ or cut domes to make it run. thanks Quote
vulvafan537240 Posted August 23, 2009 Report Posted August 23, 2009 measure the stroke. stock is 54mm and +4 is 58mm. you're gonna need 795 series pistons if its a long rod (115mm rods instead of 110mm). otherwise 513's will work. it needs to be ported, and 4mill domes or a cut head is preferred over the spacer plates. Quote
hauser2169 Posted August 24, 2009 Author Report Posted August 24, 2009 measure the stroke. stock is 54mm and +4 is 58mm. you're gonna need 795 series pistons if its a long rod (115mm rods instead of 110mm). otherwise 513's will work. it needs to be ported, and 4mill domes or a cut head is preferred over the spacer plates. whats the best way of meausring the stroke/? with a micrometer. and do i measure from the bottom of the crank to the top of the rod. or do i need to just measre the rod, like take the crank apart so i can just get a bare rod to measure? i confuised Quote
vulvafan537240 Posted August 24, 2009 Report Posted August 24, 2009 whats the best way of meausring the stroke/? with a micrometer. and do i measure from the bottom of the crank to the top of the rod. or do i need to just measre the rod, like take the crank apart so i can just get a bare rod to measure? i confuised if the motor is together, you can get a digital caliper (or dial caliper, vernial caliper etc.) and measure the stroke through the spark plug hole. Quote
hauser2169 Posted August 24, 2009 Author Report Posted August 24, 2009 if the motor is together, you can get a digital caliper (or dial caliper, vernial caliper etc.) and measure the stroke through the spark plug hole. no its not together its just a complete bottom end. so no jug or head Quote
hauser2169 Posted August 26, 2009 Author Report Posted August 26, 2009 <!--quoteo(post=1045732:date=Aug 24 2009, 01:06 AM:name=volfan537240)--><div class='quotetop'>QUOTE (volfan537240 @ Aug 24 2009, 01:06 AM) <a href="index.php?act=findpost&pid=1045732"><{POST_SNAPBACK}></a></div><div class='quotemain'><!--quotec-->if the motor is together, you can get a digital caliper (or dial caliper, vernial caliper etc.) and measure the stroke through the spark plug hole.<!--QuoteEnd--></div><!--QuoteEEnd--> no its not together its just a complete bottom end. so no jug or head k so if i put the piston on temperary and jug and head. i take the spark plug out. do i put the piston at BDC and stick a digital caliper in the hole and see if its reads 118 mm? Quote
vulvafan537240 Posted August 26, 2009 Report Posted August 26, 2009 k so if i put the piston on temperary and jug and head. i take the spark plug out. do i put the piston at BDC and stick a digital caliper in the hole and see if its reads 118 mm? put the caliper in it at bdc and turn it one revolution. the stroke should read 58mm. Quote
spurdy Posted August 26, 2009 Report Posted August 26, 2009 put the caliper in it at bdc and turn it one revolution. the stroke should read 58mm. 1/2 revolution Quote
hauser2169 Posted August 26, 2009 Author Report Posted August 26, 2009 k so put the top end back together temperary, put the digital caliper in the spark plug hole, and turn the crank 1/2 turn and it should read 58 mm. if it does read 58mm it has a 4 mill crank.? Quote
hauser2169 Posted August 26, 2009 Author Report Posted August 26, 2009 k so put the top end back together temperary, put the digital caliper in the spark plug hole, and turn the crank 1/2 turn and it should read 58 mm. if it does read 58mm it has a 4 mill crank.? ?/ Quote
hauser2169 Posted August 27, 2009 Author Report Posted August 27, 2009 yep k so i did a little messin around today. got a digital caliper out and at TDC i got34mm. at BDC i got around 88mm... i put the head back on as suggested and put the caliper in the hole. maybe im slightly retarted cause i feel like im not doin it right at all. you said rotate it a 1/2 turn. am i rotating the flywheel? fml Quote
vulvafan537240 Posted August 27, 2009 Report Posted August 27, 2009 k so i did a little messin around today. got a digital caliper out and at TDC i got34mm. at BDC i got around 88mm... i put the head back on as suggested and put the caliper in the hole. maybe im slightly retarted cause i feel like im not doin it right at all. you said rotate it a 1/2 turn. am i rotating the flywheel? fml 88-34=54mm. thats a stock stroke crank. sorry dude. Quote
hauser2169 Posted August 27, 2009 Author Report Posted August 27, 2009 88-34=54mm. thats a stock stroke crank. sorry dude. ahh shit lol. guess im goin to have to open a dispute up.. Quote
hauser2169 Posted August 28, 2009 Author Report Posted August 28, 2009 ahh shit lol. guess im goin to have to open a dispute up.. dont no if this helps but on the side of the rod it says 29 L Quote
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