Planet Minis

4X4 AG · 04-03-2009, 09:36 AM

OK, I know this is not for TRX 125's, but I thought yall would be able to help me.

What kind of mods can I do to the stock 125cc Honda engine? I want to get more power out of it.

This is my old 4wheeler that I had when I was a kid and I am just fixing it up for grins.

Also, would a Thumpstar Big Bore kit fit a Honda engine? or are they only for the Chinese?

Thanks in advance for your help.

dirtbkr188 · 04-03-2009, 09:59 AM

The TRX125 appears to be similar in configuration to the ATC110, and the Pitbike Parts are not compatible with the ATC110 engine, as discussed HERE

doopsx3 · 04-03-2009, 10:08 AM

yeah..I got one of those 125 engines and it is similar to the 90/110 Honda's which are not like pit bike engines....dratv.com may have a performance cam that may work

vegatron75 · 04-03-2009, 11:56 PM

I've got a 1986 Trx125. It is a little different, but there is a lot that is the same. I've split the cases on mine and I don't see why you couldn't hot rod it!
Mines been a pain in the ass but worth the $175 I gave for it, w/ the new chain and sprocket. It even has a cycle country snow plow.
5 forward speeds, reverse, and lights. Bigger than a trx70 but not full size. Great for the gals and kids.

4X4 AG · 04-06-2009, 05:20 AM

THanks for the replies.

I tried DrATV, and they couldn't help me much. Anyone got anymore ideas.

I got the engine running again this weekend, after it had been sitting for probably 15 years. Kicked over first try, after i replaced the carb.

04-03-2009, 09:36 AM	#1 (permalink)
4X4 AG PM Newbie Join Date: Apr 2009 Posts: 4	Trx 125 OK, I know this is not for TRX 125's, but I thought yall would be able to help me. What kind of mods can I do to the stock 125cc Honda engine? I want to get more power out of it. This is my old 4wheeler that I had when I was a kid and I am just fixing it up for grins. Also, would a Thumpstar Big Bore kit fit a Honda engine? or are they only for the Chinese? Thanks in advance for your help.

04-03-2009, 09:59 AM	#2 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 2,971	Re: Trx 125 The TRX125 appears to be similar in configuration to the ATC110, and the Pitbike Parts are not compatible with the ATC110 engine, as discussed HERE

04-03-2009, 10:08 AM	#3 (permalink)
doopsx3 3rd Gear Member Join Date: Aug 2008 Location: San Diego Posts: 3,928 My Mood:	Re: Trx 125 yeah..I got one of those 125 engines and it is similar to the 90/110 Honda's which are not like pit bike engines....dratv.com may have a performance cam that may work

04-03-2009, 11:56 PM	#4 (permalink)
vegatron75 2nd Gear Member Join Date: Jul 2006 Location: South of Kansas City Posts: 637	Re: Trx 125 I've got a 1986 Trx125. It is a little different, but there is a lot that is the same. I've split the cases on mine and I don't see why you couldn't hot rod it! Mines been a pain in the ass but worth the $175 I gave for it, w/ the new chain and sprocket. It even has a cycle country snow plow. 5 forward speeds, reverse, and lights. Bigger than a trx70 but not full size. Great for the gals and kids. Attached Thumbnails Last edited by vegatron75; 04-03-2009 at 11:59 PM.

04-06-2009, 05:20 AM	#5 (permalink)
4X4 AG PM Newbie Join Date: Apr 2009 Posts: 4	Re: Trx 125 THanks for the replies. I tried DrATV, and they couldn't help me much. Anyone got anymore ideas. I got the engine running again this weekend, after it had been sitting for probably 15 years. Kicked over first try, after i replaced the carb.

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