Planet Minis

street hooligan · 10-10-2009, 09:31 PM

looking at building a ct70 motard for some street use, what china motor/carb setup and gearing will get me in that 65+ mph range?

and or what japanese motors will get me in that range......

chasetheface123 · 10-10-2009, 09:34 PM

big klx or 124 honda. Yx 160 should do it.

magiksc · 10-10-2009, 09:37 PM

I could run mid 70s on my old Pitster motard (the one with the dual exhausts) with yx 150-yes it had motor mods but no V2 and no BBK. 17/33 gearing.

firepower354 · 10-10-2009, 09:38 PM

We'll have a CT going over 100, by spring

FastMC · 10-10-2009, 09:59 PM

Isn't "high end" and China motors an oxymoron ?

....Sorry...Had to.

chasetheface123 · 10-10-2009, 10:06 PM

Quote:

Originally Posted by firepower354

We'll have a CT going over 100, by spring

227 25hp dosent count!

firepower354 · 10-10-2009, 10:13 PM

Running against the 250 record, it does

Scaled back to 215cc, for "reliability"...
The real feat is the 125 and 175 classes. 100 is a lock, even with my abundance aboard.

Kurlon · 10-10-2009, 10:22 PM

Nicely ported 146 will do 80+.

street hooligan · 10-10-2009, 11:15 PM

hmmm really?

kurlon, by 146, do you mean a 125 with a bbk? last time i checked on those alot of people were breaking cases when kicking them over...that was long ago though.

ok then so what motor setup would you guys do for a ct motard, would like to keep it as simple as possible so what mods including carbs without going race heads or bbks could make that little bike scream at 70+

also with that high of gearing would the front wheel still come up with no clutch in 1st gear?

cdoublejj · 10-10-2009, 11:59 PM

A 124 honda i doubt it maybe 48mph, my lifan did 51 and almost all lifans come under carbed. 150 or 155 with good cr is right about the same with a 160. a z155 maxed at 56 for chuck gearing was way to shirt though, fatcat almost swears by his 177 but, think thats cheating cause that kit came with a v2 head.

50rider340 · 10-11-2009, 12:54 AM

Quote:

Originally Posted by cdoublejj

A 124 honda i doubt it maybe 48mph, my lifan did 51 and almost all lifans come under carbed. 150 or 155 with good cr is right about the same with a 160. a z155 maxed at 56 for chuck gearing was way to shirt though, fatcat almost swears by his 177 but, think thats cheating cause that kit came with a v2 head.

I dunno man I have a 114 motor xr50 3 speed in a ct90 frame with a 16 tooth in the front and a 39 rear clocked on gps flat ground "i went for a rip on the highway" at 61mph. Granted its spinning 17 inch rims and off the line its a dog. If I got a 54mm crank I'm sure I could break 70mph. My 114 isnt as fast as a gpx 140 but it will hold its own against it.

As for the original thread question. It all depends on gearing what its in etc.

Isn't there a top speed calculator / gearing program on some mini website. I remember playing around with it for like two hours one day it was so much fun haha.

street hooligan · 10-11-2009, 01:41 AM

Quote:

Originally Posted by cdoublejj

A 124 honda i doubt it maybe 48mph, my lifan did 51 and almost all lifans come under carbed. 150 or 155 with good cr is right about the same with a 160. a z155 maxed at 56 for chuck gearing was way to shirt though, fatcat almost swears by his 177 but, think thats cheating cause that kit came with a v2 head.

fatcaaat is local and i am planning on asking him to take on a sidejob and building a motor for me if i go that route.

the more and more i read it seems that a gpx160 and 17/33 is what i want. i still wanna be able to bring up the front end in first though by just flicking the throttle. all this will be on the standard 10 inch wheels with bopper tires i am sure.

cdoublejj · 10-11-2009, 01:46 AM

Quote:

Originally Posted by street hooligan

fatcaaat is local and i am planning on asking him to take on a sidejob and building a motor for me if i go that route.

the more and more i read it seems that a gpx160 and 17/33 is what i want. i still wanna be able to bring up the front end in first though by just flicking the throttle. all this will be on the standard 10 inch wheels with bopper tires i am sure.

then your in the right direction. i can't say i whole lot on the kit vs china war cause of what i now know, if i had known what i know know then

i'd have got a bigger carb and an akunar piston off the get go, that lifan would have been screaming. now that i have gotten another engine i won't be able to ever get an akunar for the lifan but, i do have the bigger carb, and maybe a firepower flywheel mod.

88ccmotoX · 10-11-2009, 07:42 AM

My CT70 w/YX150 (honda Head like Terry was selling a bit ago) does a verified 65mph with a OKO 26mm carb, big pipe, and a Firepower flywheel fix. Running a 16/31 sprocket setup as well. It's all I need for ripping around town. No more motor mods till I get better brakes up front!

DuckBoy · 10-11-2009, 08:37 AM

Honda50.com has the speed calculator

MakeshiftPatriot · 10-11-2009, 01:29 PM

A stock GPX150 with a stock front sprocket, and 30T rear will do 60mph in an 1/8th of a mile at ten seconds. So thats 0-60 in ten seconds, doesn't sound fast but with 8" tires it is. About a 67mph top speed.

Kurlon · 10-11-2009, 01:55 PM

Quote:

Originally Posted by street hooligan

hmmm really?

kurlon, by 146, do you mean a 125 with a bbk? last time i checked on those alot of people were breaking cases when kicking them over...that was long ago though.

ok then so what motor setup would you guys do for a ct motard, would like to keep it as simple as possible so what mods including carbs without going race heads or bbks could make that little bike scream at 70+

I never had any issues with breaking cases on Jialing 125s or Lifan 120s. Broke a bunch of cranks on 120s, never cases or gearboxes. I also am careful about how I kickstart.

nielspbr · 10-11-2009, 02:54 PM

Quote:

Originally Posted by street hooligan

hmmm really?

ok then so what motor setup would you guys do for a ct motard, would like to keep it as simple as possible so what mods including carbs without going race heads or bbks could make that little bike scream at 70+

A stock lifan 150 with correctly set valves and a correctly set mikuni vm26 and a good flowing exhaust will get you in that region.

(My monkey does so with 12" wheels.)

10-10-2009, 09:31 PM	#1 (permalink)
street hooligan PM Newbie Join Date: Oct 2009 Posts: 44	top speed with high end china motors? looking at building a ct70 motard for some street use, what china motor/carb setup and gearing will get me in that 65+ mph range? and or what japanese motors will get me in that range......

10-10-2009, 09:34 PM	#2 (permalink)
chasetheface123 Chuck Norris for president! Join Date: Nov 2007 Location: Boyne City Michigan Posts: 4,817 My Mood:	Re: top speed with high end china motors? big klx or 124 honda. Yx 160 should do it.

10-10-2009, 09:37 PM	#3 (permalink)
magiksc 3rd Gear Member Join Date: Oct 2006 Location: Somewhere between Heaven and Hell... Hemet/Provo Posts: 3,503 My Mood:	Re: top speed with high end china motors? I could run mid 70s on my old Pitster motard (the one with the dual exhausts) with yx 150-yes it had motor mods but no V2 and no BBK. 17/33 gearing.

10-10-2009, 09:38 PM	#4 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 11,003 My Mood:	Re: top speed with high end china motors? We'll have a CT going over 100, by spring __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

10-10-2009, 09:59 PM	#5 (permalink)
FastMC Sporting the Merkin Join Date: Mar 2004 Location: boston area Posts: 5,072 My Mood:	Re: top speed with high end china motors? Isn't "high end" and China motors an oxymoron ? ....Sorry...Had to.

10-10-2009, 10:13 PM	#7 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 11,003 My Mood:	Re: top speed with high end china motors? Running against the 250 record, it does Scaled back to 215cc, for "reliability"... The real feat is the 125 and 175 classes. 100 is a lock, even with my abundance aboard. __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

10-10-2009, 10:22 PM	#8 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 8,301	Re: top speed with high end china motors? Nicely ported 146 will do 80+.

10-10-2009, 11:15 PM	#9 (permalink)
street hooligan PM Newbie Join Date: Oct 2009 Posts: 44	Re: top speed with high end china motors? hmmm really? kurlon, by 146, do you mean a 125 with a bbk? last time i checked on those alot of people were breaking cases when kicking them over...that was long ago though. ok then so what motor setup would you guys do for a ct motard, would like to keep it as simple as possible so what mods including carbs without going race heads or bbks could make that little bike scream at 70+ also with that high of gearing would the front wheel still come up with no clutch in 1st gear?

10-10-2009, 11:59 PM	#10 (permalink)
cdoublejj 3rd Gear Member Join Date: Oct 2008 Location: St.Joe MO Posts: 1,371 My Mood:	Re: top speed with high end china motors? A 124 honda i doubt it maybe 48mph, my lifan did 51 and almost all lifans come under carbed. 150 or 155 with good cr is right about the same with a 160. a z155 maxed at 56 for chuck gearing was way to shirt though, fatcat almost swears by his 177 but, think thats cheating cause that kit came with a v2 head.

10-11-2009, 07:42 AM	#14 (permalink)
88ccmotoX 1st Gear Member Join Date: Mar 2005 Location: Findlay, Ohio Posts: 217 My Mood:	Re: top speed with high end china motors? My CT70 w/YX150 (honda Head like Terry was selling a bit ago) does a verified 65mph with a OKO 26mm carb, big pipe, and a Firepower flywheel fix. Running a 16/31 sprocket setup as well. It's all I need for ripping around town. No more motor mods till I get better brakes up front!

10-11-2009, 08:37 AM	#15 (permalink)
DuckBoy PM Newbie Join Date: Feb 2009 Location: Central Texas Posts: 87	Re: top speed with high end china motors? Honda50.com has the speed calculator

10-11-2009, 01:29 PM	#16 (permalink)
MakeshiftPatriot PM Newbie Join Date: Apr 2007 Posts: 42	Re: top speed with high end china motors? A stock GPX150 with a stock front sprocket, and 30T rear will do 60mph in an 1/8th of a mile at ten seconds. So thats 0-60 in ten seconds, doesn't sound fast but with 8" tires it is. About a 67mph top speed.

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