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Discussion Starter · #1 ·
I just picked up a real basket case of an '87 TRX250X. Its gonna need some major TLC, not to mention blood, sweat and tears.

I've got to do a full cases up rebuild on the motor, what do you think? Should I go big bore/stroke/hi-compression? How much is too much? What a good trail cam? Is head porting a benefit on these things? Who's exhaust wakes them up the most? Best replacement carb?

Then for the suspension, I am planning on 400EX arms/tie-rods, but should I also run the spindles and brakes? It's got 250R arms and Works shocks on it now. The entire chassis looks OK and is stock, including the swingarm and rear shock.

As far as things it already has that are decent:

AC Racing bumper, DG nerfs, some desert style rear grab-bar, DuraBlue +4 axle and full aluminum belly skidplate.

The plastic is black Maier front and back, but it has a green fuel tank (that has got to go) and the seat will need to be recovered. I've got a nice set of Pro Taper bars to put on it too. I'm also planning on Holeshot GNCC tires all around.

Any and all advice will be welcomed! Thanx

Also...what do you guys think is the best shop manual for this quad? I've heard varying opinions so far.
 

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There are guys with the same model nicely hopped up on this site, they will take car of you. Welcome to the site
 

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Welcome to the forums!! :icon_ worthless::icon_ worthless::icon_ worthless:
 

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I can't recommend much on the suspension, I have to ask the guys on here myself. But for the engine, I have put a JE 80mm big bore kit in mine, I am still running the stock cam, fmf exhaust, and a 400ex carb. It runs very well. You won't have trouble keeping up on the trail with anyone. I downloaded the factory honda manual for five bucks. It should be all you need. Keep in mind that all of the 300ex transmissions up until '06 are the same as the 250x. You can buy them cheap on ebay. I bought one from a '05 model to go in my stroker that I am working on. 300ex crank will not work. The jug and head are the same. I saw a "buy it now" on ebay today for the 80mm big bore kit for $259 and free shipping. That is a deal. It comes with the jug, namura piston and gaskets. Just make sure all of your bearings are good, rod within spec. etc. Fmf, hmf, white brothers, supertrapp would all be a good choice. stay away from DG and cobra. they are for sound only. I am currently running a 13 tooth front sprocket, 36 tooth rear, with 20 inch rear tires. Works good for me in the woods. Keeps good torque and still allows you to wind it out on the open road. If you run the big bore kit you will have to go up several sizes on the main jet, Powroll has a good set of instructions for jetting your carb. on their site. I am going to use the Powroll stuff for my stroker, but I have no experience with it yet.
 

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Discussion Starter · #5 ·
I appreciate all the input guys, but I have decided to part it out to pay for an '86 TRX250R. Check the classifieds for what's available.
 
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