1985 TRX125 top end questions - Honda ATV Forum
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post #1 of 8 (permalink) Old 01-28-2012, 10:33 AM Thread Starter
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1985 TRX125 top end questions

Hello all,

I picked up a complete '85 TRX125 at a scrapyard for $100. Figured I could always part it and make money. Anyway got it home, squirted some starting fluid into the spark plug and she fired right up with the rope (no battery). Put gas in and she ran great, until I saw all the black smoke.Went through all the gears fine so I decided it was a keeper. So I took the top end off and took it to my local bike/atv dealer who ordered a new gasket set, Honda brand rings ($$$!!!) and valve seals. There is some fine scoring on the piston, but they said that it was just from dirt going down the bore and that the piston was still within specs and usable. They honed the bore and put in new valve seals and off I went. My question concerns the base gasket for the jug - the new one is just a fiber gasket, while the OEM was steel with a fiber coating. Am I supposed to scrape the fiber off the old steel, or do I remove and toss the whole affair? The steel/fiber unit seems thicker to me, that's why I ask. Plus I damaged a small area of it working a putty knife in there on removal. Any help is appreciated. Cheers!
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post #2 of 8 (permalink) Old 01-28-2012, 11:00 AM
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Welcome to the forums.
Most any cylinder to crankcase gasket is paper now, the head gasket is metal. remove the whole metal gasket and replace it with what Honda gave you. Torque to spec adjust the valves and ride off into the sunset.. lol NICE Find Post up a few pics.

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

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post #3 of 8 (permalink) Old 01-28-2012, 11:05 AM
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Welcome eh! Good find but it will probably only last another 25 to 30 years. My 125's engine hasn't been touched yet

4 HONDAS 4 ME
07 Rincon... 26" Mud Bug Rs, 1 1/2" spacers, 2500# Runva winch, Kimpex box, Moose skid plate
07 Rancher 420....Type 5 IPTs w/26" Mud Lites, Moose skid plates & A-arm guards, Viper winch, Kimpex seat, fender guards

Two 06 TRX250EXs.....Tusk nerf bars, swing arm skid plates
85 TRX125.... sadly sold


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post #4 of 8 (permalink) Old 01-28-2012, 11:24 AM Thread Starter
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Thanks guys, that's good to know that I have all I need to reassemble. I figured for around $300 in total for a freshened-up runner was decent. 125cc's hauled me around the yard pretty good, I don't need any more than that. I'm amazed at how many of the old Honda trikes and TRXs are on craigslist, a testament to build quality. Cheers!
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post #5 of 8 (permalink) Old 01-28-2012, 12:44 PM
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Welcome to the forums.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #6 of 8 (permalink) Old 01-28-2012, 03:10 PM Thread Starter
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Thanks, I've been a lurker for a while.
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post #7 of 8 (permalink) Old 01-28-2012, 03:14 PM
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No lurking allowed!!!! LMAO

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_
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post #8 of 8 (permalink) Old 10-23-2012, 04:38 PM
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HAHA I just got my Fourtrax 125 for $100 and I took it home and runs great sat for 6 years
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