Still messing with this 06 that I've been on again, off again on for a while now.
It runs fine, takes off fine in first, but when it goes to shift into second, the rear wheels lock up. Same thing in third. First and Reverse work fine.
I found someone with a similar problem that said it is probably an issue with the flow tubes under the front cover.
Honda ATV Parts 2006 TRX680FA A FRONT CRANKCASE COVER Diagram
"Yes that is the high flow/ low flow tubes inside that cover #17 and #18. Just back out the hex bolt, use a small flat head or a magnet to get them out. You will able to tell how they go in there. The go into your secondary clutch. When I put the cover back on my Rincon I pinched the end of the log tube which cause the exact same problem you are describing. If that is not your issue then you can make sure your transmission worm holes are clean also, which is the box right above the hex bolt."
So if I understand correctly, the Rincon runs on oil pressure. When in Reverse and first, the oil pressure is directed through a specific oil port in the valve assembly and that pressure goes to and engages the clutch under the front cover. When in 2nd and then 3rd, the oil pressure is redirected through these oil tubes to the 2nd and 3rd gear clutches, which are in the center with the crankshaft. Is that correct?
Can anyone tell me how to get out part number 38 in that linked schematic above? I took the cap off. Tube #17 came out easily enough, but the part number 38 doesn't want to move, and obviously that keeps me from being able to see tube #16.
Thanks for an insight anyone can offer.