Honda Mini Trail CT70H

PlanetMinis Forums

Honda Mini Trail CT70H

This is a discussion on Honda Mini Trail CT70H within the Z50, CT70 and JDM Monkeybikes forums, part of the General Talk category; Not long ago I got a got a few project bikes and several engines plus parts. The one that has my attention is this CT70H ...

Results 1 to 13 of 13
  1. #1
    Member
    This user has no status.
     
    SEAHAWKS's Avatar

    Join Date
    Apr 2017
    Posts
    76

    Honda Mini Trail CT70H

    Not long ago I got a got a few project bikes and several engines plus parts.

    The one that has my attention is this CT70H because it has a manual 4 speed transmission.

    I was thinking about options for this engine like what bike should I put it in? Or how should I build it?

    For now I need to find out what parts is it missing?

    Will any CT70 stator and flywheel work on this CT70H? What about ignition coil and wire harness - which one to buy?

    So far my parts list is:

    Flywheel, Stator, Points & Condenser, Stator Cover, small round clutch cover, clutch lever, clutch cable, woodruf key, flywheel nut, ignition coil.....

    Can anyone tell me anything about these 4 speed engines? I have a cylinder head for this engine. The engine did turn over and compression felt good.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	20170510_164959_1494732335167.jpg 
Views:	36 
Size:	4.81 MB 
ID:	210194   Click image for larger version. 

Name:	20170510_164820_1494732364969.jpg 
Views:	34 
Size:	4.90 MB 
ID:	210202   Click image for larger version. 

Name:	20170513_201701_1494732394367.jpg 
Views:	34 
Size:	4.87 MB 
ID:	210210   Click image for larger version. 

Name:	20170513_194142_1494732428478.jpg 
Views:	33 
Size:	724.7 KB 
ID:	210218   Click image for larger version. 

Name:	20170513_194229_1494732462013.jpg 
Views:	33 
Size:	4.07 MB 
ID:	210226  

    Click image for larger version. 

Name:	20170513_194220_1494732488603.jpg 
Views:	33 
Size:	4.09 MB 
ID:	210234   Click image for larger version. 

Name:	20170513_194154_1494732519866.jpg 
Views:	30 
Size:	856.9 KB 
ID:	210242   Click image for larger version. 

Name:	20170513_194130_1494732560561.jpg 
Views:	31 
Size:	3.94 MB 
ID:	210250  

  2. #2
    Member
    This user has no status.
     
    SEAHAWKS's Avatar

    Join Date
    Apr 2017
    Posts
    76
    I have some different parts to cherry pick from if at all possible. Theres a few 70 engines, can I use the flywheel from the doner engines?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	20170513_204034_1494734679192.jpg 
Views:	35 
Size:	4.84 MB 
ID:	210258   Click image for larger version. 

Name:	20170513_204815_1494734702894.jpg 
Views:	26 
Size:	4.28 MB 
ID:	210266   Click image for larger version. 

Name:	20170513_203307_1494734727117.jpg 
Views:	35 
Size:	4.71 MB 
ID:	210274   Click image for larger version. 

Name:	20170513_203358_1494734751418.jpg 
Views:	32 
Size:	3.96 MB 
ID:	210282   Click image for larger version. 

Name:	20170513_203613_1494734776919.jpg 
Views:	27 
Size:	3.85 MB 
ID:	210290  

    Click image for larger version. 

Name:	20170513_205904_1494734812176.jpg 
Views:	27 
Size:	3.99 MB 
ID:	210298  

  3. #3
    Member
    This user has no status.
     
    SEAHAWKS's Avatar

    Join Date
    Apr 2017
    Posts
    76
    In my parts I found the Mitsubishi flywheel and the backing plate for the stator looks like it fits.

    These items are expensive to buy on eBay. I guess the 4 speed stator is different than a 3 speed auto. A rebuild kit for the CT70H is available for around 60.00.

    I ended up buying a kit, it includes new points, condenser, felt, wiring, and hardware.

    Will any CT70 carb work or do I need the right one? The previous owner said something about a vacume secondary or sonething.

  4. Remove Advertisements
    PlanetMinis.com
    Advertisements
     

  5. #4
    Junior Member
    This user has no status.
     
    bcuda1969's Avatar

    Join Date
    May 2013
    Posts
    28
    Quote Originally Posted by SEAHAWKS View Post
    I have some different parts to cherry pick from if at all possible. Theres a few 70 engines, can I use the flywheel from the doner engines?
    The rebuild kit you bought is most likely for a Hitachi not a Mitsubishi. They only make Hitachi repair kits as far as I know. You wil need the Hitachi flywheel with the mechanical advance inside it like the Mitsubishi. also you will need a hitachi stator plate for the coils as the Mitsubishi is different also.

  6. #5
    Member
    This user has no status.
     
    SEAHAWKS's Avatar

    Join Date
    Apr 2017
    Posts
    76
    My flywheel is a Hitachi, but it may still be the wrong one. Heres some pics:
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Screenshot_20170514-195833_1494817344869.png 
Views:	23 
Size:	226.6 KB 
ID:	210434   Click image for larger version. 

Name:	20170514_195223_1494817241553.jpg 
Views:	22 
Size:	3.98 MB 
ID:	210394   Click image for larger version. 

Name:	20170514_195140_1494817263019.jpg 
Views:	22 
Size:	4.48 MB 
ID:	210402   Click image for larger version. 

Name:	Screenshot_20170514-195901_1494817288155.png 
Views:	24 
Size:	687.6 KB 
ID:	210410   Click image for larger version. 

Name:	Screenshot_20170514-195911_1494817305957.png 
Views:	24 
Size:	785.5 KB 
ID:	210418  

    Click image for larger version. 

Name:	Screenshot_20170514-195715_1494817323838.png 
Views:	23 
Size:	1.18 MB 
ID:	210426  

  7. #6
    Senior Member
    This user has no status.
     
    kirrbby's Avatar

    Join Date
    Aug 2014
    Location
    Davison Mi.
    Posts
    431
    In post #2, the 3rd pic, the 4th flywheel has the advancing mechanism in it. It's badly rusted. Is that the Mitsubishi flywheel you said you have?

    You can probably buy a used stator setup for the H for about 200-250. Or you could also replace the crankshaft. Put a 12 volt stroker crank in and convert the bike to 12v CDI.
    You could put a regular 3speed crank in and run any 3speed stator on it...you would loose the timing advance.

    Some joker spray painted that engine, and painted right into the INSIDE of the motor. It should probably be gone thru and properly cleaned and inspected. That makes the stroker crank very tempting. The missing stator makes a 12v conversion very tempting.

    Right now, what you REALLY have there, is a 4speed transmission, a manual clutch setup, and a set of cases. Start there, then decide what you want to build.

  8. #7
    Member
    This user has no status.
     
    SEAHAWKS's Avatar

    Join Date
    Apr 2017
    Posts
    76
    What are my options for building a stroker? I saw a 106cc stroker kit somewhere.

    Spending two fiddy towards a stroker seems like the way to go. If I knew what all these extra flywheels were Id eBay them.

    I dont think my Hitachi flywheel is the correct one for the 70h model.

  9. #8
    Member
    This user has no status.
     
    SEAHAWKS's Avatar

    Join Date
    Apr 2017
    Posts
    76
    Oh yea, that flywheel you pointed out is too big to fit on my flywheel. I soaked it in vineager to clean off the rust.

    What does it belong to so I can sell it, lol?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	20170514_203530_1494860362062.jpg 
Views:	27 
Size:	4.70 MB 
ID:	210553   Click image for larger version. 

Name:	20170514_215251_1494860393742.jpg 
Views:	25 
Size:	4.50 MB 
ID:	210561  

  10. #9
    Senior Member
    This user has no status.
     
    kirrbby's Avatar

    Join Date
    Aug 2014
    Location
    Davison Mi.
    Posts
    431
    That is a Mitsubishi flywheel from a H, but it's missing the points cam. Pretty important part. lol. Very, very hard to find just the points cam for it. You could sell it as a parts, part. Someone might need something off of it, use it to rebuild their own flywheel, etc. You could look to see if you have the stator plate that goes with it... Measure the center's of the mounting holes for the coils on your stator plates. The Mitsubishi will have different centers(measurement)than probably all the rest. Should be a smooth lookin plate. The points cam, if you have it, will look like a short piece of pipe, with a flange on one end. And it will fit your crank lolol

  11. #10
    Member
    This user has no status.
     
    allenp42's Avatar

    Join Date
    Mar 2014
    Posts
    37
    In post #2, 1st pic, engine to the right, you have a partial Hitachi H stator. It's missing the lighting coil. which is unique to the H i believe. However, you can purchase a Hitachi refurb kit from CHP or NEVH for about $35. That kit includes both coils, wiring, points, condenser, o-rings, seals etc. I did not see an H flywheel (Hitachi) in the lot. I also did not see a stator for a Mitsubishi flywheel? Maybe you have one or the other under a cover or in box you haven't been through yet?

  12. #11
    Member
    This user has no status.
     
    SEAHAWKS's Avatar

    Join Date
    Apr 2017
    Posts
    76
    Ive been thinking about building this up with a big bore kit. I have a few questions for those of you who have tried the available options we have.

    Is the 80cc upgrade worth it? What about that stroker kit 106cc's?

    Id like to go faster than a stock 70cc. For the price of a flywheel/stator & the 106 stroker kit.....I could buy a larger 125cc engine for less money.

    Would the CT70H be a more reliable engine to build with a 106cc stroker kit, than a Lifan 125cc engine?

    What other brands have good feedback for aftermarket engines?

  13. #12
    Member
    This user has no status.
     
    SEAHAWKS's Avatar

    Join Date
    Apr 2017
    Posts
    76
    Ok I pulled the stator plate off a z50 that looks exactly like the CT70H stator plate.

    Whats the difference in these plates?

    I got my CT70H stator rebuild kit in today and the coils will mount up to the similar one I pulled...and it fits another z50 plate.

    Anyways I have a stator plate to clean up and rebuild with my new kit.

    I just need to find a ct70h flywheel.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	20170518_182147_1495157734701.jpg 
Views:	14 
Size:	4.45 MB 
ID:	210945   Click image for larger version. 

Name:	20170518_182939_1495157752306.jpg 
Views:	14 
Size:	4.16 MB 
ID:	210953  

  14. #13
    Senior Member
    This user has no status.
     
    loopiemclooperson's Avatar

    Join Date
    Oct 2011
    Location
    Maple Valley WA
    Posts
    364
    I have a atc70 flywheel that would work for your crank taper, but no mechanical advance. I am local if you wanted to give it a shot?

    Sent from my SCH-I545 using Tapatalk

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. Honda mini trail 50
    By rdh/86200x in forum Z50, CT70 and JDM Monkeybikes
    Replies: 4
    Last Post: 07-01-2015, 10:57 AM
  2. FS: 1971 HONDA Z50 K2 MINI TRAIL MINI BIKE Fully Restored “Restro Rod” HardTail
    By RSAmerica in forum Complete Bikes For Sale - All makes and models
    Replies: 3
    Last Post: 04-01-2013, 12:19 PM
  3. Honda ct70 mini trail mini bike $650.00 O.B.O. (hwy 242 south roseboro, nc 28382)
    By will1972rupp1 in forum Z50, CT70, ZB50 and other Honda Parts
    Replies: 0
    Last Post: 04-21-2012, 02:07 PM
  4. 69 Honda Mini Trail
    By Matified in forum Z50, CT70 and JDM Monkeybikes
    Replies: 9
    Last Post: 03-28-2011, 11:25 PM
  5. questions about my honda mini trail 50
    By pat99 in forum CRF50
    Replies: 15
    Last Post: 07-22-2006, 01:51 PM

» Log in

User Name:

Password:

Not a member yet?
Register Now!

» Sponsored Links

Powered by vBadvanced CMPS v4.3.0