Mid Life Crisis Posted February 8, 2011 Posted February 8, 2011 Anyone know if a GPX160 will fit in the ATC70 frame? Quote
SKINNER Posted February 8, 2011 Posted February 8, 2011 yes sir it will, any china based horizontal engine should fit just fine. Quote
Bustin-bs Posted February 8, 2011 Posted February 8, 2011 Yeap! now that would be one hell of a ride! Quote
CampIdiot Posted February 9, 2011 Posted February 9, 2011 Whats up Jerry ready to ditch the 140? Quote
Mid Life Crisis Posted February 9, 2011 Author Posted February 9, 2011 LOL I want more juice! With the GPX160 you can go to a 184 big bore and V2 Race head. Getting 20+ HP outta that combo! Other otion is to go bigger on 140 carb, maybe a ported head or something. I dunno what I wanna do yet. Quote
Bustin-bs Posted February 10, 2011 Posted February 10, 2011 on your 140 what are you running for carb size? Also what type of 140 (YX/GPX/Pitster/Piranha/?) have you dialed in the right gearing for this motor? Quote
NE14SAND Posted February 10, 2011 Posted February 10, 2011 your just upset it doesnt smoke the 125 like you thought Quote
Mid Life Crisis Posted February 15, 2011 Author Posted February 15, 2011 (edited) Im running a 24mm carb w/ a 42 pilot and 98 main. The motor is a DDR140 out of a pit bike. It needs a little love in the needle and main area but at 9 bucks a jet its coming along slowly. The motor I was looking at was a GPX160. As for my gearing I have a 14 front and OEM rear. I havent played with gearing yet. What I found was that I wasnt able to pull the 125cc Lifan unless I get the jump off the line. Other than that if its a clean start its an even run. I just want more juice!!!!!!!!!!!! Edited February 15, 2011 by Mid Life Crisis Quote
Island Chain Racing Posted February 15, 2011 Posted February 15, 2011 I gotta say this. a 140 or a 160 in a atc 70 is a lot of power.I know cause I got both. A well tuned 140 is verry hard to beat. If you have a novice rider on the 160 and a good rider on the 140......the 140 wins...$9 a jet wow. Your getting rob. Try pjmotorsports.com and talk to paul and tellem Joey D sent ya. He was a sponsor for the regatta . I say stick with the 140 and build it.....my $0.02.....and just trying to help Quote
Mid Life Crisis Posted February 15, 2011 Author Posted February 15, 2011 Thanks ICR! Ill give him a call and see about the jetting. What other mods can I do to get more out of the 140? Quote
Island Chain Racing Posted February 15, 2011 Posted February 15, 2011 Lots. How big is your wallet.....haha...that will determine how fast your gonna go.....I recommend basic stuff.....for eg; head work, cam, BB kit, its kinda endless.....but if you can't tune it, then your just spending money for nothing. Don't get me wrong, you'll get power most of the time when you do an upgrade. You still gotta tune it..... Quote
Mid Life Crisis Posted February 26, 2011 Author Posted February 26, 2011 (edited) Ok heres the plan so far.... Gonna go with the cam upgrade from DR ATV and maybe move up to a 26mm carb. Im finding that these chinese carbs say 24 but there really like a 20-22. So popping for the real mikuni may make a huge difference once its jetted properly. Port work and big bore will be on hold till end of the year if needed. lol Edit - and installing an oil cooler cuz this baby runs H-O-T with an over exhaust pipe. Edited February 26, 2011 by Mid Life Crisis Quote
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