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Old 11-07-2007
amcfeek Offline
2-Stroke Mechanic

 
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Default help in building my yz 490 up

ok my neighbor had a few of yz490's back when i couldnt afford one ..
now i kinda can squeek one in on a budget so i bought some parts and 2 basket cases .
i would like help on annybody's input on porting this monster probably just open the exhaust up to one that i have / alreaddy ported .radius the ports ,and drill out the boost ports from reed cage to transfer ports keeping them small 8mm
polish everything up and kick my nads off to get her started.

what i have so far is this
2 basket cases . 84 and 85 1 will be donor for the missing bolts . 1 is too far gone

ok bought 1 good bottom end complete cdi wireing etc with a new rod in it
this is the it490 5 speed version . its a 83 ish.
2 84 jugs #40t 1 thats 3rd over 1 is .060 thats good with fresh wiseco piston kit
1 head for the 40t 7 bolt heads .
1 complete 84 bottom end that needs a rod kit its loose and bearings are noisy .
came from basket case when piston chernobled
1 rod kit from ebay 60$ with shipping
1 good 82 yz 490 jug that is only .10 over wont work with the 84 frame was going on my 82 it 250 that is a complete bike still std bore, till i got the basket cases and 1 good 83 yz 490 jug thas a fresh 80 but cracked external trans port
i have enough to make 1 motor fom the yz top end on the it bottom end .
i probabbly have 400 bucks into all of this i am shure you would shell out the 4 bills for all of this

i also will chop up a ktm roller for the front forks inverted marzochi 's
only thing i am shy is the exhaust for this i do have 2 yz250's 90'sish and a fmf unknown bike on the way . if worse comes to worse i have a mig welder and its winter out if you fill a piece of pipe with water you can bend it without crimping it.
that is if its pennsylvania and the pipe is outside and its winter . i watched a how things are made and they made trumbone parts this way .. heck a piece of flat steel plate 3 small wheels with no tires burn a slice so the one wheel can bend the pipe looped through all 3 , add an air shock , or a hydraulic lifgate pump to the center wheel thay rides in the slot and i think i can bend my exhaust myself ..
ok now shoot me
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