I bought this little trx 90 for my son for Christmas this year I rebuilt the motor top end piston and rings just to get it running to see if he would take a liking to it the back plastics where SHOT I put some old 110 atc rear plastics on to keep the mud off of him ran great just was having shifting issues he loved riding so for his 5th B-day he asked for a bigger motor so I put a full auto 110cc motor in it with reverse painted the frame put lights on it why can I not post pics ????

 

I believe you have to have a minimum number of posts to put pics up. you should be close. What motor did you swap in? sounds like a cool little machine.

 

Take a look at my garage I put in a 110cc and it is awesome runs like a top