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Need someone to help me so i can stop arguing with my friend did honda back than make a atc500r or did someone just put a 500cc motor in a trike ??????
 

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Nope, no official Honda 500R ATV ever existed for sale to the general public that I'm aware of. However, you can put an FT500/XR500 sleeve and 4-valve head onto a ATC350X/TRX350D jug & cases, swap in a stroked crank and XR500 piston and make your own 500 cc screamer.
 

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Nope, no official Honda 500R ATV ever existed for sale to the general public that I'm aware of. However, you can put an FT500/XR500 sleeve and 4-valve head onto a ATC350X/TRX350D jug & cases, swap in a stroked crank and XR500 piston and make your own 500 cc screamer.
Damn!! I bet those fly with that B.B. mod!! Cornering i should imagine is next to impossible:laugh:
 
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Damn!! I bet those fly with that B.B. mod!! Cornering i should imagine is next to impossible:laugh:
Yep, they run pretty strong in a stretched ATC350X or TRX250X frame. The great thing about that motor mod is you get to start with a standard factory bore, so oversize pistons and head gaskets are readily available come rebuild time. The upper 38T timing chain sprocket (14321-428-000) on the FT/XR500 motor is interchangeable with the 14321-HA0-010 sprocket used on the 250/350 motors as well. Camshafts interchange between each head too. Check valve-piston clearances if you swap a 500 cam into a 350 head. :)

The main obstacle to overcome is the oil supply difference with the FT/XR500 heads. The 500 heads get oil supplied through a hollow head stud from the case, while the 350 head gets oil through an external pipe from the oil filter output. Gotta adapt your own oil supply from the 350 case to the 500 heads but there are a couple options for that. This mod requires a clutch pack upgrade too. Stronger springs and frictions.

You can also run a stock 350 crank rather than a stroker for fewer cc... just move the wrist pin location on the rod up by swapping in a longer rod. Lotsa options...
 

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^^^^^ That build must be blistering powerful!
 
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I’d hurt myself on that CR500 powered ATC!! I’d love one but know I’d push it to far and come a cropper!! Cool build though.
 
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