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View Full Version : TRX 250R Build?



daBIGKAHUNA
10-06-2011, 10:56 PM
I have been thinking about doing a frame up TRX 250R build - not a show bike but a rider. Will an 86 atc250r motor fit the TRX frame? Also - I know there were some slight differnces in the 88/89 models - what are they and are those years more favorable for a project like this?

I am sure there will be tons of parts to be found for them. Just would need to find them at a decent price.

Addicted
10-07-2011, 08:38 PM
Yes a atc motor will fit, and yes 88/89 are alot more rare then 87/86, the biggest difference in frame is 88/89 foot pegs are held in with a pin so the move. While 86/87 bolt up like the ATC. And 86/87 have steel swingers, while 88/89 have aluminum. But don't you dare tear apart an Atc for a Trx :D

LT80
10-13-2011, 09:42 AM
I have a 86-89 R..LOL
Currently a ATC bottom end in it and various years of other parts.
86's have the short rod. 99% of motor builders use the long rod. I use the short rod. I will switch to the long rod on the next crank because the short rod cranks are like 600 bucks compared to 250 for the long rod crank (prices are approx and I haven't checked in a cpl years).
In 87 they improved the cylinder and again in 88 (bridged intake side). Everyone uses a 88/89 cylinder.
The swingarms are different. Some have a motor mount in the swingarm, later ones don't. The ones that don't are prefered but really not a big deal. The length of swingarm was longer in 86 than 88/89's. I like the longer.
There are electric differences between the years. A 86 CDI won't plug into a 89 (for example).

88r8303
10-13-2011, 09:25 PM
I have a 86-89 R..LOL
Currently a ATC bottom end in it and various years of other parts.
86's have the short rod. 99% of motor builders use the long rod. I use the short rod. I will switch to the long rod on the next crank because the short rod cranks are like 600 bucks compared to 250 for the long rod crank (prices are approx and I haven't checked in a cpl years).
In 87 they improved the cylinder and again in 88 (bridged intake side). Everyone uses a 88/89 cylinder.
The swingarms are different. Some have a motor mount in the swingarm, later ones don't. The ones that don't are prefered but really not a big deal. The length of swingarm was longer in 86 than 88/89's. I like the longer.
There are electric differences between the years. A 86 CDI won't plug into a 89 (for example).




Very well said.