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Old 11-13-2013, 12:02 PM   #6796
XR4EVER
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Joined: Aug 2012
Location: Post Falls, ID
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Quote:
Originally Posted by Stretch67 View Post
I'm just getting done swapping in a 2000 TRX engine into a street-legal 2002 frame.


Let us know how the gearing feels, the different torque curve feels (if any), and does that one have reverse? Any pics?!!
Very cool, man.
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Old 11-13-2013, 12:29 PM   #6797
Stretch67
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It doesn't look much different, 'cept for the lump under the carb. Booger1 provided relevant pics in his post that I linked.
My battery setup is a bit different, with three welded-in mounting points instead of Booger1's two-point setup...




Ignore the 'rub mark' on the back of the battery box. I sanded away a rib molded into the plastic, making the back
of the box smooth. I removed the rear shock during mock-up, and made sure the rear tire clears the battery box at full
compression.



It is a bit crowded under the seat now. You'll recognize the Starter Relay, Regulator / Rectifier, and Main Fuse.
The CDI box is in the regular XR place, behind the engine on the left side.

On a TRX ATV, the CDI box is on one end of the frame under the handlebars, while the Regulator / Rectifier is on
the other end, hanging under the left rear fender. Scads of cutting and splicing were involved here to make all these
items fit in this one spot without wads of wire in one place and not enough length in others.

The small black Bosch lighting relay is for the bike's lights. I'm running dual H4 headlights from a Buell Lightning.
Lotsa watts flowing in there... I don't want to melt the switch and wires.



From my readings here and on ThumperTalk, the TRX engine's gearing is about 8% lower than that of an XR400. That
can easily be compensated for with sprocket changes. I have a 14, 15, and 16 front, so I can swap around and
experiment. I had a 14 on the bike before, so with lower gearing in the TRX engine, I might run a 15 on the front and
see how it feels.

Also, the TRX4 cam reportedly offers more lower end torque than the XR4, which will be great for singletrack.
The bike will see very little street use at all, so low gearing and good torque at the expense of high-RPM horsepower
is just fine with me.

No reverse on mine. There are times when that would be handy, but those engines are about 500 dollars more.
I couldn't justify the expense.
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Stretch67 screwed with this post 11-13-2013 at 06:03 PM
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Old 11-13-2013, 01:21 PM   #6798
LtsGoRyd
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Man, that is awesome. Sooooo wishin I had a "magic button." I got my cherry 04'(don't ask about swingarm...she's stuck for now) back in July of this yr. Got her titled and legal, runs like a champ. Cranks pretty easy. 2 prime/1 kick when warm, and if it sits for 2 weeks, go through crank procedure twice, 3rd time cranks right up. I've got Ricky Stator, new stator side OEM gasket, regulator/rectifyer, flasher and trail tech battery ready to install, but I am electrically challenged, to put it mildly. Hopin I can bribe a friend/inmate soon . Can you post a couple more photos on battery box , and how/where it's mounted, type of box used. I think I saw DRZ type box and battery, but not sure. Man, the folks on this ADV site are too smart for my lint filled wallet, but oh well, sure is fun. Sure hope I get to ride with some folks from here soon, ride safe. joe
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Old 11-13-2013, 01:28 PM   #6799
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Dang you musta been readin my mind. Careful, kinda dangerous in there....Now, if I could just locate that electrician .
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Old 11-13-2013, 01:37 PM   #6800
XR4EVER
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Thanks for the follow-up. Do you know if the gearing difference is in the overall final gearing, or are the ratios of, say, first and second lower and fifth is the same as the xr4? (Same 1st-5th ratios with lower final ratio, or just a wider-ratio transmission?) Just curious for my own schemes....
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Old 11-13-2013, 05:36 PM   #6801
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First gear is about the same... the upper ratios are progressively lower in the TRX.


XR400R
2.830, 2.620, 1.840, 1.400, 1.120, 0.930


TRX400EX
2.826, 2.916, 1.937, 1.473, 1.181, 1.000
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Old 11-17-2013, 08:37 PM   #6802
bitwrench
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Location: Im back in SoCal again, sorta..Ca.
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New, old, old stock

Greetings,
I get to join the XR400 club with this prime example rescued from the corner of someone's garage. The Dunlop K695 rear and K490G front are long out of production. I believe these tires rolled off the showroom floor..





Supa Low Hour




Guard Dog on doodie




Svelt


I gave my credit card some exercise by purchasing various controls
and sundry items..big tank, Pegs, gearing etc...
I get a trailer hitch on the Camry next weekend. Then I work on getting it 'streetable'. HOOTERS...early X-mas for this dog.
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Old 11-17-2013, 09:01 PM   #6803
xr400r
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Nice find you lucky dog. good bike for sure
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Old 11-17-2013, 09:40 PM   #6804
NSFW
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nice barn find!

exact same condition when i found mine 5 years ago, not a single scratch and the header has the blueing.
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Old 11-18-2013, 07:37 AM   #6805
Stretch67
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Sheeee-iiit. My scratches have scratches.
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Old 11-18-2013, 08:04 AM   #6806
MartiniUp
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Quote:
Originally Posted by bitwrench View Post
Greetings,
I get to join the XR400 club with this prime example rescued from the corner of someone's garage. The Dunlop K695 rear and K490G front are long out of production. I believe these tires rolled off the showroom floor..





Supa Low Hour




Guard Dog on doodie




Svelt


I gave my credit card some exercise by purchasing various controls
and sundry items..big tank, Pegs, gearing etc...
I get a trailer hitch on the Camry next weekend. Then I work on getting it 'streetable'. HOOTERS...early X-mas for this dog.
Yes, a lucky dog you are!
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Old 11-18-2013, 08:59 AM   #6807
bitwrench
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Location: Im back in SoCal again, sorta..Ca.
Oddometer: 204
Malik button

Quote:
Originally Posted by NSFW View Post
nice barn find!

exact same condition when i found mine 5 years ago, not a single scratch and the header has the blueing.
Trade you straight across for your E-start.
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Old 11-18-2013, 10:11 AM   #6808
n16ht5
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wow that is a really clean one.. good find.. don't forget to grind the header welds off and grease it up
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Old 11-18-2013, 10:57 AM   #6809
GCRad1
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Hey Stretch67,

Awesome engine swap! Thanks for the share!
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Old 11-18-2013, 11:12 AM   #6810
Stretch67
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That's a photo from about a year ago, old engine. Just showing off the Buell headlights... she looks mean as hell.
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