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post #1 of 97 (permalink) Old 04-10-2019, 03:47 AM Thread Starter
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1988 trx300fw

Well outlaws, the tear down has started !. removed the topend while the motor was still in the frame, as you can see, the piston died !..lol. cylinder was in pretty bad shape. i'd almost be willing to bet, by looking at the piston, that i've got a bent exhaust valve ?. have not tore the head down yet, just wanted to get the motor out, and torn down a bit to get the cam chain out, clutches out. called it a night. enjoy the tear down pics :-).
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'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #2 of 97 (permalink) Old 04-10-2019, 03:49 AM Thread Starter
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few more tear down pics. got a very long way to go on this, one day at a time ! :-).
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post #3 of 97 (permalink) Old 04-10-2019, 04:46 AM
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Wow, who ever owned that one , looked like they wasn't into changing the engine oil , that is the blackest oil I think I ever seen in an ATV engine , looks like a Detroit Diesel
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post #4 of 97 (permalink) Old 04-10-2019, 05:01 AM Thread Starter
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Wow, who ever owned that one , looked like they wasn't into changing the engine oil , that is the blackest oil I think I ever seen in an ATV engine , looks like a Detroit Diesel
lol, I think your right !. it was pretty gooey and sticky to say the least !!. rod seemed to be ok from what little time I had my hand on it, everything looks to be in good shape so far. although...the clutch one-way bearing is bad, won't catch when kicking it over. this is the trx300fw that jeep gave me for rebuilding his '97 trx300fw.

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post #5 of 97 (permalink) Old 04-10-2019, 09:44 AM
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That was the first 300 I picked up. I picked it up about 5 years ago. Later on I picked up a couple of 2nd gens because I really wanted to run 424's and the only way to get a 424 for a first gen is the custom $500+ ones. Figured I would fix this one up and flip it, but Shade has more time and expertise than I do, and I'm sure his end result will be much nicer than any attempt I would have made.

I already had some parts I sent with it that I knew it would need. Freshly bored cylinder and new piston, timing chain, battery, front knuckles with new bearings and ball joints, new tie rod ends, gasket kit and oil seals, air filter, spark plug, and a stock 300 rear end with a rebuild kit. I was hoping that would be all Shade would need.

Hopefully the rest of what is needed won't set him back much.

When I bought it, by all appearances it had been sitting in the guys yard for years without moving. Had about 4 inches of tree sap on it.

That said, it was mostly there (missing rear end) and black engine oil is better than milk (water)!
misterclean59 and retro like this.

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post #6 of 97 (permalink) Old 04-10-2019, 10:29 AM Thread Starter
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Originally Posted by Jeepwm69 View Post
That was the first 300 I picked up. I picked it up about 5 years ago. Later on I picked up a couple of 2nd gens because I really wanted to run 424's and the only way to get a 424 for a first gen is the custom $500+ ones. Figured I would fix this one up and flip it, but Shade has more time and expertise than I do, and I'm sure his end result will be much nicer than any attempt I would have made.

I already had some parts I sent with it that I knew it would need. Freshly bored cylinder and new piston, timing chain, battery, front knuckles with new bearings and ball joints, new tie rod ends, gasket kit and oil seals, air filter, spark plug, and a stock 300 rear end with a rebuild kit. I was hoping that would be all Shade would need.

Hopefully the rest of what is needed won't set him back much.

When I bought it, by all appearances it had been sitting in the guys yard for years without moving. Had about 4 inches of tree sap on it.

That said, it was mostly there (missing rear end) and black engine oil is better than milk (water)!
water or oil, wont make a diff, gonna rip it all apart anyway, give it a good cleaning out.

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post #7 of 97 (permalink) Old 04-10-2019, 10:34 AM Thread Starter
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update: just as I said, with the piston destroyed like it was ?, sure enough, exhaust valve was bent, exhaust guide was damaged. was able to order new intake and exhaust valves, both guides, and a one-way clutch bearing. my first glance at the head seemed like it would not work with the ex valve seat ?, but i'm pretty sure it will be ok.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #8 of 97 (permalink) Old 04-10-2019, 01:07 PM
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Freshly bored cylinder
A Dick's Cycles bore job ?

Shade better mic that cylinder and piston before putting it all together
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post #9 of 97 (permalink) Old 04-10-2019, 02:07 PM Thread Starter
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Freshly bored cylinder
A Dick's Cycles bore job ?

Shade better mic that cylinder and piston before putting it all together
lol, I take it, that place don't do a good job huh ??..lol.

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post #10 of 97 (permalink) Old 04-10-2019, 02:23 PM
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Yep, but same batch that my daughter's 300 cylinder was in, and it seems to be good to go.

That 350 cylinder actually doesn't smoke anymore since I put a new crank in it. As I understand it, Dick's was subcontracting out the cylinder work. Think it was to Ted Thomas IF (big if) I understood things correctly.
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