Fitting a Honda auto clutch to a manual Chinese motor?

PlanetMinis Forums

Fitting a Honda auto clutch to a manual Chinese motor?

This is a discussion on Fitting a Honda auto clutch to a manual Chinese motor? within the Z50, CT70 and JDM Monkeybikes forums, part of the General Talk category; So, I have this poor CT70 project that I have stalled on for a mate of mine. Bike lived down the nj shore and was ...

Results 1 to 11 of 11
  1. #1
    Senior Member
    This user has no status.
     
    66Cooper's Avatar

    Join Date
    May 2005
    Location
    Dirtey Jersey
    Posts
    901

    Fitting a Honda auto clutch to a manual Chinese motor?

    So, I have this poor CT70 project that I have stalled on for a mate of mine. Bike lived down the nj shore and was under water from super storm Sandy. Motor was filled with slat water. Enough said.

    I was really trying to save the motor but doesn't look likely after finding even more wrong. I do however have a Chinese 125 manual motor just hanging about. Brand new. Says Monster Joe on the side...I'm sure it's exactly like all the other motors. Anyway, it's a manual and the owner really wants to keep it auto. I happen to have an XR50 auto trans in a box. Can you swap out one of these Chinese manuals for a stock (12v) Honda auto??? I'm assuming no but work a shot.

    50 Nuts

    Fat Tires Rule

  2. #2
    Super Moderator
    is grateful again...
     
    dirtbkr188's Avatar
    Supporting Member

    Join Date
    May 2004
    Location
    New Jersey
    Posts
    8,107
    Not with that engine, it has a mainshaft mounted clutch. If it had a crank mounted clutch, you could use all the necessary XR50 clutch parts to do the conversion.
    - dirtbkr188 -



  3. #3
    Senior Member
    This user has no status.
     
    66Cooper's Avatar

    Join Date
    May 2005
    Location
    Dirtey Jersey
    Posts
    901

    Fitting a Honda auto clutch to a manual Chinese motor?

    That is exactly what I was thinking. RATS!!

    Well, anyone have a good auto motor they want to trade for this then. Haha
    Last edited by 66Cooper; 03-18-2017 at 03:49 PM.
    50 Nuts

    Fat Tires Rule

  4. Remove Advertisements
    PlanetMinis.com
    Advertisements
     

  5. #4
    Senior Member
    This user has no status.
     
    kirrbby's Avatar

    Join Date
    Aug 2014
    Location
    Davison Mi.
    Posts
    337
    Look into using TRX90 parts on your motor. The TRX has a trans mounted clutch but with a 2nd, centrifugal, clutch on the crank. It's a good setup, and shifts really nice.

    >>>You may only need to add the centrifugal clutch, to your manual setup. Works just like the standard Honda semi auto.
    Last edited by kirrbby; 03-18-2017 at 07:51 PM.

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

    Join Date
    Feb 2008
    Location
    Breukelen, Netherlands
    Posts
    1,724
    A standard xr/crf50 clutch would not hold the torque from the 125.

  7. #6
    Senior Member
    This user has no status.
     
    66Cooper's Avatar

    Join Date
    May 2005
    Location
    Dirtey Jersey
    Posts
    901
    Interesting. I never looked at the TRX90. Always wondered how china came up with this clutch setup on motors like this one...now I know!
    50 Nuts

    Fat Tires Rule

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

    Join Date
    Aug 2014
    Location
    Davison Mi.
    Posts
    337
    You would need the right side, clutch side, semi auto engine cover from the TRX too I'm sure. Then the hole for the kick shaft and seal would have to be machined.
    I think your manual clutch Chinese engine is patterned after the Honda Nice/wave engines.

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

    Join Date
    Sep 2004
    Location
    Arlington, VA
    Posts
    5,497
    trx90 auto not compatible unless you plan to replace the crankshaft, cylinder, cam chain, studs, and piston.

    However, a trx90 engine is a most excellent pitbike engine. You can put a 54mm top end on it for a 115cc, add some porting and a cam, and add a kickstarter and have a really great 4-speed indestructable motor. I know..I have one...it's excellent for dual sporting.

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

    Join Date
    Aug 2014
    Location
    Davison Mi.
    Posts
    337
    Quote Originally Posted by fatcaaat View Post
    trx90 auto not compatible unless you plan to replace the crankshaft, cylinder, cam chain, studs, and piston.

    However, a trx90 engine is a most excellent pitbike engine. You can put a 54mm top end on it for a 115cc, add some porting and a cam, and add a kickstarter and have a really great 4-speed indestructable motor. I know..I have one...it's excellent for dual sporting.
    The TR90 parts won't fit into his chinese clone 125??

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

    Join Date
    Sep 2004
    Location
    Arlington, VA
    Posts
    5,497
    Quote Originally Posted by kirrbby View Post
    The TR90 parts won't fit into his chinese clone 125??
    The rear clutch pack and clutch cover will fit, but not the one-way clutch mechanism...the cranks are completely different.

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

    Join Date
    Aug 2014
    Location
    Davison Mi.
    Posts
    337
    Quote Originally Posted by fatcaaat View Post
    The rear clutch pack and clutch cover will fit, but not the one-way clutch mechanism...the cranks are completely different.
    Good info, ty.

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. chinese manual clutch on honda motor
    By oilspot in forum CRF50
    Replies: 6
    Last Post: 07-15-2010, 11:29 PM
  2. Replies: 10
    Last Post: 08-04-2009, 02:24 AM
  3. Replies: 16
    Last Post: 08-04-2004, 01:30 AM
  4. Replies: 4
    Last Post: 05-18-2004, 12:36 PM

» Log in

User Name:

Password:

Not a member yet?
Register Now!

» Sponsored Links

Powered by vBadvanced CMPS v4.3.0