Electronics

you never mentioned anything about the speed sensors grasshopper !...lol.

word from the wise: unless you put the engine in gear , and put the front into 4wd ?, the front diff will never work !. i found this out the hard way on an older trx450fm !. i did the same thing you are doing..light on dash would light up, but no movement on front diff ?..after buying a control unit..plugging it in ?..same problem !. it was by accident that i was able to see why the front diff was not working ?..i was checking out the transmission , to make sure it shifted through all the gears ?, low and behold, the front 4wd light stayed lit..no flashing, and the front end was working !. sooo..in other words..the atv has to be in gear..like ..1st ?, turn switch from 2wd to 4wd..then watch to see if the front end works ?. also..keep in mind..most of these atvs that have a electronic front diff, they have not 1 ?, but 2 speed sensors !. this is how the front diff works !. sooo..until you put the atv in gear..and the front output drive shaft is spinning ?, the first speed sensor at the front side, input side of the diff can not see any movement on the drive shafts pinion gear ?, sooo..the electronic part of the pinion gear will not engage from pinion gear to ring gear. the second speed sensor is on the very front, top side of the diff..right on the middle of the differential,  its covered by a metal plate cover, same goes for the first speed sensor at the drive shaft input side, left side when viewing from seat.

save your money, go to AutoZone, O'Reilly's, napa, any one of these places sell fuel line, normally when i replace fuel lines on atvs..or any engine for this matter ?, i buy fuel injection rated fuel lines from autozone, it's not cheap by the foot ?, but its cheaper than wasting cash with honda !..lol. may as well grab some small hose clamps while your there..they are easier to install than those stupid clamps honda uses. as for those cracked lines ?, they are just carb vent lines, not much to worry about when re-attaching them. myself ?, i always remove them..toss them in the trash, why ?..because i do not ride in any kind of deep water, mud..so forth. soo..i do not worry about anything getting into the carb. only time this may..or may not be an issue for me ?..is when i wash my atvs down with a water hose..pressure washer ?..but even then .i try to keep the water away from the carb.

my first thought is..did you inspect the cam lobes for any odd wear ?. did you remove the valves..and see if any of them are bent ?. did you inspect for any wear in the cam journals in the head ?. rebuilding an engine takes more than just tossing parts at it ?, YOU MUST INSPECT EVERYTHING WHEN TAKING IT APART ?,,AND PUTTING IT BACK TOGETHER !. last but not least for now..did you insspect the rocker faces on the rockers for any wear ?. take a jump back into this, then get back to us.

So does it need to be oem fuel line cause it looks like it only comes in quite long lengths and is fairly expensive. Also the oem primer bulb is expensive tho amazon has some off brand ones for a lower price. As you said it doesn't really get used anyways so an off brand one should work eh? Another question, the two hoses that come up out of the carb, then join together and end up in the white plastic piece in front of the carb, two of those hoses have cracks in them where they clip on to the Y piece. Is that an issue? It doesn't look like they do a lot since they end out in the open. Could the cracked sections simply be clipped off and reattached? Thanks a lot for taking time to help