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Old 02-27-2012, 10:41 AM   #1
Dirt Road Cowboy OP
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Honda CT 90/110 Questions

I'm thinking about building a CT90/110 with a Lifan engine. I'm going to buy a frame and build it up from a bare frame. It won't be anything really stock looking, probably more of a rat type bike, for real ADV use.

My first question is, are they the same frame?

Also, is there any particular years to avoid due to poor construction etc.?

What would be the maximum size engine one of these frames could hold?

If I think of any other questions, I'll be sure to bug you guys!

Thanks!
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Old 02-27-2012, 11:19 AM   #2
hugemoth
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The frames are pretty much the same with the exception being the pre 1967 models which were CT200s. It's slightly easier to mount the clone engines in the CT200 frame.

They are all plenty sturdy.

Max engine size would be any size horizontal clone engine you can find.
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Old 02-27-2012, 11:53 AM   #3
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Quote:
Originally Posted by hugemoth View Post
The frames are pretty much the same with the exception being the pre 1967 models which were CT200s. It's slightly easier to mount the clone engines in the CT200 frame.
How much easier is it to mount in the CT200 frame? Would it justify the extra cost?

Are the other parts all basically interchangeable, such as the forks and swing arm?

Thanks!
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Old 02-27-2012, 01:07 PM   #4
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The thing that makes the CT200 easier is that the frame is the right width and the mounting holes are in the right place. Mounting a clone engine in a later model CT90 or 110 requires a few minutes of sheet metal grinding with an angle grinder, drilling a couple holes, and using some washers as spacers. No big deal. I recommend you join the clone engine yahoo group for a wealth of info on the subject.

http://autos.groups.yahoo.com/group/honda_clone
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Old 02-29-2012, 02:38 PM   #5
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i had a early 70's with a 150cc lifan motor, seemed to go ok, i think my 110 has more power or maybe better gearing, my 90 doesnt have the same power i would aim for a mid 70's frame k5 and up
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Old 03-02-2012, 08:05 PM   #6
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140cc or 150cc?

Okay, I'll get a CT200 frame to simplify the process.
Also, is a pre 67 CT90 the same as the CT200?

Now I need to decide on an engine. Would you suggest the Lifan 140 or 150? I've read that the 140 is more reliable.
Does anyone have experience with both of them?
What are the advantages and disadvantages of each?

I want to get as much power as possible, but keep reliability. If I have to go smaller for a more reliable engine, I will.

Thanks again guys!





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78 GL1000 Full Vetter
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66 CT200/Lifan 140 (Trail 90) Build Report
XR100 engine and misc. parts, waiting for the Mad Scientist treatment!

Dirt Road Cowboy screwed with this post 03-02-2012 at 08:46 PM Reason: Looked like fun.
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Old 03-03-2012, 04:28 AM   #7
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I was wrong, a pre-1966 would be a CT200. Both the CT200 and CT90 were called Trail 90s. It'll probably be easier to find a CT90 than a CT200.

My Lifan experience is only with the 110cc, 140cc, and 200cc vertical cylinder so I can't comment on the 150cc. Never a problem with any of them. The 110 is a smooth running engine with a little more power than the stock CT90. The 140 has a lot of low end power making it great for off road riding and it'll push the CT 55 to 60 mph depending on conditions. The only drawback is it takes a lot of umph to kick over and tends to kick back. If you go with the 150 engine make sure it comes with high output stator and flywheel if you're going to use it on the street. All of the 150s I've seen come with the "racing" stator which won't power a full lighting system.


Quote:
Originally Posted by Dirt Road Cowboy View Post
Okay, I'll get a CT200 frame to simplify the process.
Also, is a pre 67 CT90 the same as the CT200?

Now I need to decide on an engine. Would you suggest the Lifan 140 or 150? I've read that the 140 is more reliable.
Does anyone have experience with both of them?
What are the advantages and disadvantages of each?

I want to get as much power as possible, but keep reliability. If I have to go smaller for a more reliable engine, I will.

Thanks again guys!





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Old 03-03-2012, 10:42 AM   #8
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Quote:
Originally Posted by hugemoth View Post
I was wrong, a pre-1966 would be a CT200. Both the CT200 and CT90 were called Trail 90s. It'll probably be easier to find a CT90 than a CT200.

My Lifan experience is only with the 110cc, 140cc, and 200cc vertical cylinder so I can't comment on the 150cc. Never a problem with any of them. The 110 is a smooth running engine with a little more power than the stock CT90. The 140 has a lot of low end power making it great for off road riding and it'll push the CT 55 to 60 mph depending on conditions. The only drawback is it takes a lot of umph to kick over and tends to kick back. If you go with the 150 engine make sure it comes with high output stator and flywheel if you're going to use it on the street. All of the 150s I've seen come with the "racing" stator which won't power a full lighting system.
I like the way your bike looks with the 140 and the bigger gas tank. I think that the small tanks Honda put on their trail bikes was one of the dumbest things they ever did. I had a CT70 when I was younger, and that .6 gallon tank was just ridiculous!

I have noticed that the frames marked CT200 were quite a bit more expensive than the ones stamped CT90. Usually by $50 or more. Was there ever actually a 200cc engine in any of these?

Also, are the other parts (triple tree, swing arm, etc.) interchangeable between the years?

Thanks!


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Old 03-03-2012, 02:09 PM   #9
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Quote:
Originally Posted by Dirt Road Cowboy View Post
I like the way your bike looks with the 140 and the bigger gas tank. I think that the small tanks Honda put on their trail bikes was one of the dumbest things they ever did. I had a CT70 when I was younger, and that .6 gallon tank was just ridiculous!

I have noticed that the frames marked CT200 were quite a bit more expensive than the ones stamped CT90. Usually by $50 or more. Was there ever actually a 200cc engine in any of these?

Also, are the other parts (triple tree, swing arm, etc.) interchangeable between the years?

Thanks!


.
CT 200 was 05/1964 to 04/1966 VIN (CT200-1000001) 04/1966 changed to CT90 designation CT90K0..... 1966 to 1968 VIN (CT90-100001had 4 speeds with dual rear sprockets, late in that run dual range trans appeared. All had leading link front suspension. 1969 CT90K1 VIN (CT90-200001) appeared with telescopic front suspension.

CT90K1 to CT90 1979 are all very very similar color and graphics and minor up grades turn signal etc almost all parts interchange on this series

All were 89 cc all called Trail 90
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Old 03-19-2012, 02:54 PM   #10
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Well, I bought a 64-66 (?) (CT200-149256) CT200 frame, and found a good deal on a Lifan 140cc engine.

Should I go with the stock triple tree and forks, or is there a better option? This will be used on the road as well as for some off-road trail exploration.

Will the tree and forks from a later model work?

Thanks. I'm actually getting excited over a little trail bike! What am I, 12 again???



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Old 03-19-2012, 05:21 PM   #11
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You might have to cut and extend the neck tube on the triple tree an inch or so but all the small Honda forks use the same neck bearings (with some exceptions for the moto bikes) so about anything would fit. You'll also have to add a fork stop--no biggie.

If you go longer on your fork length consider using a Passport swingarm and 13" shocks to balance the bike out. That's what I had to do to use a set of XR-100 forks on my bike. The Passport's shock mounts are taller than the CT's and used in conjuction with cheap ($50) 13" shocks ought to level the bike out and give you some rear fender-to-tire clearance to boot.
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Old 03-19-2012, 11:53 PM   #12
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fork swap

I've cut the ct stem out and made bush to press into some kx80 trees.



The same was done on a mates bike to fit forks of a yamaha ag100
http://www.advrider.com/forums/attac...1&d=1325675439

Ct125 200 forks and trees bolt in

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Old 03-20-2012, 12:12 PM   #13
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Well, I found out that the XL 125 tree should bolt right up, so that's probably the route I'll be going. I will know for sure once all the parts get here and I take some measurements.

I will try to remember to take pics and document the build for the next person that wants to make one.

Thanks for all your help.





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Old 06-24-2013, 06:28 PM   #14
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Crap! I didn't realize how long ago I started thinking about this!

I got the CT200 frame, 140 Lifan engine, XL125 forks and tree, and a bunch of other parts.

Then life came up, and all my 2 wheeled projects went on the back burner, and the only thing that I had to ride was my motorized bicycle.

But, now the bug is back, as well as a little money to finish buying parts.

Maybe I can get this thing together and ride soon!
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66 CT200/Lifan 140 (Trail 90) Build Report
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