Tore it Down 5 Times! 1986 Honda TRX 70 Top End Rebuild Failure #doitforcolton

Welcome back to our channel, ATV enthusiasts! In this detailed video, we're tackling a top-end rebuild on a classic 1986 Honda TRX 70. Join me on a frustrating journey of attempting to rebuild the top end of a 1986 Honda TRX 70. Despite meticulous efforts and multiple teardowns, I encountered unforeseen challenges at every turn. From mysterious knocks to unexpected malfunctions, this project turned into a relentless battle against mechanical mysteries. Watch as I document each setback, sharing valuable lessons learned along the way. Whether you're a seasoned mechanic or a DIY enthusiast, this cautionary tale serves as a reminder of the unpredictable nature of mechanical restoration. Join me as I strive to overcome adversity and unlock the secrets to a successful rebuild.

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[ronfrance]

Crazy. I’ve watched the build series for this Honda on your other channel a bunch of times. I’m restoring my childhood 86 trx70 for my 5 year old right now too.

[PilotMcbride]

One thing we used to do with 4 stroke engines after strip down is used 2 stroke oil for the 1st tank full of fuel. Seemed to make them bed in better. 50 - 100 to one.
Thanks for posting.

[jakeschisler]

Glad you got it fixed properly and it should last many years

[Tubeagrutis]

Great show of persistence, Brandon! Cool vid!

[koreywilliams]

I pulled apart and rebuilt a harbor freight predator 212cc engine a couple years back and it was surprisingly easy. Really fun learning how it worked.

[davidbegor]

One thing i learned a long time ago is after valves are installed, use a wood dowel ass a punch and pop the valve stem a couple of times to be sure the locks and springs settle in place before installing rockers.

[scottchastain]

Congratulations on the new grand baby!

[travelguy]

What about buying a 90cc big bore kit - ? What big bore kit would you recommend for "Easy Bolt-on" without changing the carb out (maybe just a bigger jet for the carb). Thanks

[MrMyers]

So with your new cylinder/cylinder head gasket, did it have the cam seal chamber rubber rectangular seal? Or do the newer gaskets not need it?

[RC-fuhg]

Just wondering? Did you hone the cylinder so the new ring can be broken in. If not that may be why it was smoking after. Unless it smoked before the rebuild. Then who knows.

[SHSPVR]

Did add the all o-ring to head gasket side one of which is for oil feed up to head to feed rocker shaft and cam journal as it may force oil into the combustion chamber if it missing and make sure the first and second ring gap facing towards the bottom one clock at 4 and other at clock at 7 that oil can drain off and not pool up In between the rings and oil ring gap at clock at 12.

[koreywilliams]

Go power sports sells all kinds of upgrades for these small engines.