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Old 12-28-2013, 05:57 AM   #16
plugeye
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Quote:
Originally Posted by bykpimp View Post
I also think you're being optimistic if you think you're gonna cruise down the road at 60 mph
+2
wrung-out maybe 50
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Old 12-28-2013, 12:32 PM   #17
Kiba OP
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Quote:
Originally Posted by plugeye View Post
+2
wrung-out maybe 50
Jeez guys... my KE100 would do an (indicated) 65mph, flat out in fifth. With 25 fewer ccs, questionable maintenance history and running 25:1 premix.

Because of speedometer inaccuracy I figure the real speed was around 60.

But I could cruise in top gear pretty comfortably at an indicated 55mph, which was probably about 50 in real speed.

Why couldn't this bike do the same? It has a displacement advantage, better maintenance, functional oil injection, and tires that aren't knobbies.

I'm all ears, but what's the difference?
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Old 12-30-2013, 08:13 AM   #18
Foot dragger
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Quote:
Originally Posted by Kiba View Post
Jeez guys... my KE100 would do an (indicated) 65mph, flat out in fifth. With 25 fewer ccs, questionable maintenance history and running 25:1 premix.

Because of speedometer inaccuracy I figure the real speed was around 60.

But I could cruise in top gear pretty comfortably at an indicated 55mph, which was probably about 50 in real speed.

Why couldn't this bike do the same? It has a displacement advantage, better maintenance, functional oil injection, and tires that aren't knobbies.

I'm all ears, but what's the difference?
AT1's are ratty little bikes designed in the late 60's,to put it bluntly.
The noises they make going down the road would cause any sympathetic person to slow down. They are good for putting around,going fishing,cruising around town. They dont make much power is a kind way of saying it.

Even my old 1972 250 Yamaha Enduro wasnt fond of hiway cruising at much speed. I blew it up at least 3 times in 30,000 miles or so and still didnt kill it completely,just kept cleaning it out and boring it again.
Ill handling knee breaker of a bike.
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Old 01-03-2014, 08:01 PM   #19
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Originally Posted by Foot dragger View Post
AT1's are ratty little bikes designed in the late 60's,to put it bluntly.
The noises they make going down the road would cause any sympathetic person to slow down. They are good for putting around,going fishing,cruising around town. They dont make much power is a kind way of saying it.

Even my old 1972 250 Yamaha Enduro wasnt fond of hiway cruising at much speed. I blew it up at least 3 times in 30,000 miles or so and still didnt kill it completely,just kept cleaning it out and boring it again.
Ill handling knee breaker of a bike.
footdragger, since you have some experience with these bikes, can you remember how complex the CT head swap was? A guy on ebay has the jug and piston and it would be nice if it were that simple. But if not, there's the head, pipe, carb jetting- and whether the bottom end is really the same. Do you remember whether the jet, head, etc had to be changed or was it a straight shot w/ jug and piston?

I have a spare parts motor coming in so I'm thinking, "Why not?"
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Old 01-05-2014, 07:48 PM   #20
Reverend12
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My first Bike, That bike is really nice, don't hack it.
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Old 01-10-2014, 05:53 PM   #21
*Gmoney*
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Quote:
Originally Posted by plugeye View Post
+2
wrung-out maybe 50
I am going with 50 also
and if someone put a 16 tooth counter on it,
he will be leg paddling on hills to start.
Stock was 14/45.
I have a 72 CT2 175 stock
it is more like a trials bike that can go 50 or anywhere,
Enduros they called them, like little slow burros.
This is my 4th one, they are all the same 125 through 250.
I hope he leaves it stock, and enjoys it as it was made.
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Old 01-11-2014, 04:31 PM   #22
Foot dragger
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Quote:
Originally Posted by Kiba View Post
footdragger, since you have some experience with these bikes, can you remember how complex the CT head swap was? A guy on ebay has the jug and piston and it would be nice if it were that simple. But if not, there's the head, pipe, carb jetting- and whether the bottom end is really the same. Do you remember whether the jet, head, etc had to be changed or was it a straight shot w/ jug and piston?

I have a spare parts motor coming in so I'm thinking, "Why not?"
I never rode one much other then a CT175 somebody found under some stairs and gave to me,it seems like guys used to put the 175top end right on the 125,might be best to ask an expert though. I vaguely remember the 125 electric starter having trouble turning the 175 over.
Jetting is probably a little different in the carb.
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Old 01-11-2014, 06:41 PM   #23
stainlesscycle
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ct1 swap head, cylinder and piston. this is the only way to do it and use your carb.. you will need to jet.

these other methods will need a reed/carb and intke.

ct2/3 head cylinder piston reed carb.


dt175 top ends are a dime a dozen. all the early ones will fit. (they say 443 on the intake). you will need a reedcage intake and carb.
i have a spare dt175 cylinder and head i will never use. $50 + shipping. somebody sold it to me site unseen as an mx175 cylinder (this has happened twice...i don't know why someone would say 'yeah it says 455 on the side' when it clearly says 443....) obviously you would need carb (i probably have 10 laying around that will work) and an intake and reedcage (i have none)

it's that simple.


if you want performance find a yz175 cylinder/head. you will need to cut the skirt a bit. or you could use a 74/75 mx175 cylinder/head - good luck finding any of these though. they are hard to come by in usable shape.

you can gear it to do 60 or so. maybe even 70 with a bunch of performance work. that's with the 175 top end. 125cc = 50-55mph really screaming.
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stainlesscycle screwed with this post 01-11-2014 at 06:56 PM
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Old 01-11-2014, 08:13 PM   #24
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Quote:
Originally Posted by stainlesscycle View Post
ct1 swap head, cylinder and piston. this is the only way to do it and use your carb.. you will need to jet.

these other methods will need a reed/carb and intke.

ct2/3 head cylinder piston reed carb.


dt175 top ends are a dime a dozen. all the early ones will fit. (they say 443 on the intake). you will need a reedcage intake and carb.
i have a spare dt175 cylinder and head i will never use. $50 + shipping. somebody sold it to me site unseen as an mx175 cylinder (this has happened twice...i don't know why someone would say 'yeah it says 455 on the side' when it clearly says 443....) obviously you would need carb (i probably have 10 laying around that will work) and an intake and reedcage (i have none)

it's that simple.


if you want performance find a yz175 cylinder/head. you will need to cut the skirt a bit. or you could use a 74/75 mx175 cylinder/head - good luck finding any of these though. they are hard to come by in usable shape.

you can gear it to do 60 or so. maybe even 70 with a bunch of performance work. that's with the 175 top end. 125cc = 50-55mph really screaming.
Thanks. My memory of the little KE just must be off, or the guy who sold it to me installed a different speedo with improper ratio. I wouldn't have been able to tell at the time.

Although I have decided to keep this thing close to stock I don't feel comfortable on the street if my bike can't flow with traffic. I'm not touring on it or anything, but the only trails I can get to here require some driving/riding. 60 top should be fine, if I can pull 50 at middle revs (2500-5000) it would be fine.

Would the CT1 head/jug/piston swap be able to pull this off? The DT swap sounds better but budget as always is an issue. YZ would be cool but I'm assuming a bit of reliability is sacrificed . I really don't mind short maintentance intervals since this is a play bike for me, but I'm not fond of seizing on the road.

I've read a bit about the MX pipe for these too. Apparently it narrows the powerband quite substantially though.
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Old 01-20-2014, 12:15 AM   #25
Bud Tugly
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Never owned one of these but I had the Kawasaki equivalent (1974 KS125) and it topped out at just over 70 indicated. I used it on a 30 mile highway commute and ran it at 55-60 mph all the way with no problems. Hard to believe that the Yamaha wouldn't be similar in performance.
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Old 01-20-2014, 01:15 PM   #26
stainlesscycle
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Originally Posted by Bud Tugly View Post
Never owned one of these but I had the Kawasaki equivalent (1974 KS125) and it topped out at just over 70 indicated. I used it on a 30 mile highway commute and ran it at 55-60 mph all the way with no problems. Hard to believe that the Yamaha wouldn't be similar in performance.
i'm just guessing, but that ks125 is rotary valve - probably makes more hp stock than the at1.
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Old 01-20-2014, 08:05 PM   #27
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i'm just guessing, but that ks125 is rotary valve - probably makes more hp stock than the at1.
I was gonna say the same,those old rotary valve Kawis could be made to flat scream,guys rode the Green Streak 100's for short track and they were evil little bikes and were fast stock,really screaming Fast when pumped up.
Like all old 100's handling was barely even an afterthought and it was up to the rider to keep it pointed the right way.
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Old 01-20-2014, 08:14 PM   #28
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Originally Posted by stainlesscycle View Post
i'm just guessing, but that ks125 is rotary valve - probably makes more hp stock than the at1.
That may be the answer to my old KE's performance too, since it was also rotary valve.
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