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Old 04-21-2010, 08:09 PM   #1
GR0NK OP
Got some screws loose!
 
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Joined: Sep 2006
Location: In the Valley of Bomb Runs...
Oddometer: 1,815
Wicked Pull start CT90 and other performance enhancements

So it's time to tackle this little Zombie chaser 78 CT90 I got for free and make it run again. At first I just wanted to basically do a resto of sorts and hang it up on the front of the motorhome to use as a runabout to explore trails or to run to the store when packing up would be a PITA. But the more I thought about it, the more I want to do something different, and more importantly, fix some of the shortcomings of the original design.

As reliable as these scoots are, there are things that can be improved and I'm aiming to do it it one fell swoop.

Cons:
-points ignition
-6 volt electrical
-limited power for a 200+ lbs person in high range

I have been researching some options and I think I have finally settled on a solution. That solution comes in the form of a Honda ATC 125M motor. It is one of the biggest factory Honda horizontal motors made and it has a fix for all of the shortcomings plus a few bonuses.

Pros of the 125M motor:
-CDI ignition
-12 volt electrical
-more power than the 90cc motor
-electric start
-retains the dual-range transmission
-pull start backup

I suppose one could just swap in a Chinese clone engine of up to 172cc (biggest that I know of) and get most of those pros but I think the dual-range transmission is part of the appeal of these bikes and is something I really would like to keep for both practical and nostalgic reasons.

I'm wondering if anybody has heard of this swap before and if they have any information on it. I have come across a few guys on the CT90 Yahoo group who have done it so I know it's doable but information is lacking. If I can't find more info then I guess I'll just learn it as I go and share that knowledge.

Also, any performance discussion for these horizontal motors is welcome.




Sean
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Old 04-21-2010, 08:49 PM   #2
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Location: In the Valley of Bomb Runs...
Oddometer: 1,815
Some pics of the neglected beast.





[


High-flow exhaust...



Top secret performance wiring mod...



What's going on here?





Sean
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Old 04-22-2010, 12:06 AM   #3
wanna bECO
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wow, what a beast... didn't know you could swap a 125 ad have the dual range.. did honda make some dual range 3 wheeler that I don't know about??

I agree with you 100 percent about the short comings of the ct 90. I can't tell for sure but it seems even the 110's had 6 volt electrics, at a time when the c70 all went 12 volt (re: 82 passport)

Now, I can't believe you got it free, that is my favorite price. Oh, and I hate you... I totally hate you!! ..... j/k
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'94 Harley .... a blue one
'82 Honda passport
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Old 04-22-2010, 07:46 AM   #4
Speedo66
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I especially like that special rear wheel designed for riding on rails.
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Old 04-22-2010, 07:48 AM   #5
spotch
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I don't have any technical support to offer here, but that seems like an awesome idea.
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Old 04-22-2010, 08:44 AM   #6
GR0NK OP
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Quote:
Originally Posted by wanna bECO
wow, what a beast... didn't know you could swap a 125 ad have the dual range.. did honda make some dual range 3 wheeler that I don't know about??

I agree with you 100 percent about the short comings of the ct 90. I can't tell for sure but it seems even the 110's had 6 volt electrics, at a time when the c70 all went 12 volt (re: 82 passport)

Now, I can't believe you got it free, that is my favorite price. Oh, and I hate you... I totally hate you!! ..... j/k
There were many Honda 3 wheelers with dual-range transmissions and the 125M was one of them.



It was free but it was my uncle who gave it to me so I'm sure he'll collect a few favors for it.



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Old 04-22-2010, 09:42 AM   #7
wanna bECO
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wow,.... i want an awesome 3 wheeler too. i bet lifan would clean up if they made that engine.

When your uncle calls, act sleepy and cough a lot!!
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current stable

'94 Harley .... a blue one
'82 Honda passport
'87 Honda spacy 250
And an E Bike
85 spacy 250
81 passport (in pieces, many parts for sale)
The hit's just keep coming.. bought another 81 passport (11-28-09)

http://tiny.cc/ITgetsBETTER
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Old 04-22-2010, 08:11 PM   #8
D-FENS
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Quote:
Originally Posted by GR0NK
That solution comes in the form of a Honda ATC 125M motor.
Is the 125M still being produced by Honda?
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Old 04-22-2010, 08:28 PM   #9
GR0NK OP
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Quote:
Originally Posted by D-FENS
Is the 125M still being produced by Honda?
Not as far as I know. Nothing being sold in North America comes with this motor but that doesn't mean Honda doesn't make it for some other market.

Luckily these trikes are plentiful and easy to locate. I have already located a running motor as well as a complete running ATC in my neck of the woods.



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Old 04-23-2010, 09:44 PM   #10
robertjludwigsr
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125 swap

suggest you join the ct90 ct110 yahoo group they can probably tell you how to do it. sure someone in that group of 3400 members has done it
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Old 04-24-2010, 07:34 PM   #11
GR0NK OP
Got some screws loose!
 
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Quote:
Originally Posted by robertjludwigsr
suggest you join the ct90 ct110 yahoo group they can probably tell you how to do it. sure someone in that group of 3400 members has done it
Thanks. I've been a member there for the past year. I did get the idea from a few other members there but there hasn't been much info posted.

I also ran it by Jack at dratv.com and hope he can help me with the misc parts I might need.



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Old 04-26-2010, 11:15 AM   #12
GR0NK OP
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Scored a (mostly) complete ATC 125M for the swap. The machine was rough and in a few pieces but the motor looks to be in running condition. As luck would have it though, it's missing the pull start.



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Old 04-26-2010, 06:01 PM   #13
mac66
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I always wondered why a small motorcycle has a kick starter and a big ATV has a pull starter? I had to pull start my 500cc ATV once and it just about pulled my arm out of the socket when it kicked back.
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Old 04-26-2010, 07:33 PM   #14
GR0NK OP
Got some screws loose!
 
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Joined: Sep 2006
Location: In the Valley of Bomb Runs...
Oddometer: 1,815
Bummer. The motor I found is a dud. Looks fine at first glance, missing the recoil start though.





And the exhaust port is cracked which is common because they get hammered eventually.



But why doesn't the range selector do anything and what's all this goop for?



Let's have a look.

This gear has had some excitement...



This is a primo goop job...



Too bad you can't really fix broken cases with bubble gum.







Oh well, paid less than a C note for it and it came with the full wiring harness and electrics. Just that was worth the price. Probably get my money back from putting some stuff on fleabay.



The search for a pull start motor continues.



Sean
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Old 04-26-2010, 11:56 PM   #15
wanna bECO
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Gonk, where are you located... phoenix??
__________________
Just cuz my bike is shiny, doesn't mean that I'm a hiny

current stable

'94 Harley .... a blue one
'82 Honda passport
'87 Honda spacy 250
And an E Bike
85 spacy 250
81 passport (in pieces, many parts for sale)
The hit's just keep coming.. bought another 81 passport (11-28-09)

http://tiny.cc/ITgetsBETTER
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