2000 yz250 trike conversion

[big specht]

Couldn’t you just change the rake buy just rotating the frame and lowering the subframe

[plevib]

I suppose a person could, but you'll dip the frame closer to the ground, tilt your foot pegs down, and possibly some other issues I can't think of. Anyways triples are built with 6 degrees so it's too late now, but I think the bike will handle best like this anyways.




I'm REALLY happy with how these turned out. I don't have a mill so these were built with a chop saw and a cheap drill press. 6 degrees of rake built into them just like a 86r. I really couldn't be happier with the results. I'll post a video detailing the whole process. I think this could be a great option for the guys who can't afford CNC'd triples.

[big specht]

There was a guy on here that used a router to radius a aluminum rotor adapter the a conversion he did. It turned out pretty good too

[BOB MARLIN]

"I suppose a person could, but you'll dip the frame closer to the ground"

The frame actually gets farther away from the ground because your axis of rotation becomes the front axle. But you're way past that now.
One of the best changes I did on my conversion is bigger foot pegs. If you get a set for a YFZ quad, you can trim the mount end a bit and they slide right over the YZ bike peg the weld them together. That way you keep the stock mount and the spring loaded fold back feature.

What was the angle of the resulting rake you were looking for ?. Measured at the fork leg with an "angle finder" I was able to get 24 degrees, which is right on with what my 350x is.

[ATC King]

I have a question on the fabrication of aluminum parts.

Exactly what needs annealed to work/machine, and what needs heat treating before putting into use?


I know many materials require certain treatments after final fabrication, to reach their full strength and fatigue resistance.

[BOB MARLIN]

I know much more about steel than aluminum, but my understanding is Aluminum is purchased in its heat treated/annealed state. Steel goes through a heat treat after machining or at least before finish machining. Wear items such as gears get heat treated for surface toughness other things get heat treated differently for impact resistance( like a ) or twisting (like a truck axle). I can't think of much on a trike that needs any heat treatment outside of internal engine components and rear axle.

[plevib]

https://youtu.be/6hv_IFYfl6g

Here's the build video for the triple clamps. I'm very happy with the end result for the 75 bucks worth of aluminum. Next up, taking 6 degrees out of the frame!

[legacy51]

Nice looking triples and thanks for the video! That should make it more doable for others to copy.

Do you know how much trail a 250r has? I am curious what it comes to. A first gen tecate has about 1.6 in which is a lot less than dirt bikes. Most dirt bikes seem to have 4-5 in of trail.

[legacy51]

I think I found the answer to my own question thanks to barnett468.


1984 ATC250R
rake ............................ 69 mm . This is measured from horizontal instead of vertical so using current methods, the rake is actually 31 degrees but it is unknown if this is the forks or the steering head.
rake forks ....................... ?
trail ............................. 45 mm . . 1.8 in
w.b .......................... 1197 mm . 47.1 in
dry weight ......... ..... 302 lbs
dry bias ..................... ft 117 . rr 185 lbs
bias percentage ........ ft 38.7 . rr 61.3
axle position ............. trailing
tripple trees .............. unknown but look staggered which would make sense


1985 ATC250R
rake .............................. 21 deg
rake forks ........................ ?
trail ............................... 37 mm . . 1.45 in
w/b ........................... 1295 mm . 51.00 in
dry weight .................. 291 lbs
dry bias ...................... ft 117 . rr 174 lbs
bias percentage ......... ft 51.3 . rr 48.7
axle position .............. trailing
triple trees ................. unknown but im guessing they are staggered the same as the 86'


1986 ATC250R
rake .............................. 21 deg
rake forks ..................... 30 deg ? . . if this is the fork rake then these tripple trees are staggered 9 mm
trail ............................... 38 mm . 1.5 in
w/b ........................... 1905 mm . 75 in
dry weight .................. 289 lbs
dry bias .................... ft 116 . rr 173
bias percentage ......... ft 50.9 . rr 49.1
axle position ............... leading
tripple trees ................ staggered 9 mm?


1984 and 1985 TECATE
rake ............................. 24 deg
trail .............................. 40 mm . 1.57 in
w/b .......................... 1280 . 50.4 in
dry weight .................. 286.6 lbs
wet weight ................. 312
wet bias ..................... ft130 . rr 181
bias percentage ....... . ft 42 . rr 58
axle position ............... leading
tripple trees ................ non staggered


1986 TECATE
rake ............................. 24 deg
trail .............................. 48 mm . 1.57 in
w/b .......................... 1280 mm . 50.4 in
dry weight ................. 280 lbs
wet weight ................ 299 lbs
wet bias .................... 121 . 178 lbs
bias percentage ........ ft 40.5 . rr 59.5
axle position .............. leading
tripple trees ............... non staggered

[BOB MARLIN]

If the above is true, does that mean that the 86 R has 9 deg. built into the clamps and not the 6 that we have all been told ?.

Also I doubt very much that the 86R is 2 feet longer than the 85R, I'm assuming w/b means "wheel base" ?.

[El Camexican]

Also I doubt very much that the 86R is 2 feet longer than the 85R, I'm assuming w/b means "wheel base" ?.

Rule #1 of TWW: If Barnett468 posted it, it's a FACT

Rule #2 of TWW: If you think Barnett468 is wrong, see rule #1

[jasong_10]

It also says that the 86 is a leading front axle, I've only got first-hand experience with my 85 but every pic of the 86's I've found is a trailing just like mine . . . ?

[El Camexican]

It also says that the 86 is a leading front axle, I've only got first-hand experience with my 85 but every pic of the 86's I've found is a trailing just like mine . . . ?

Obviously someone is turning these axles around and putting pictures on the Internet to try and undermine Barnett’s FACTS. Don’t be fooled by these obvious forgeries!

[BOB MARLIN]

I didn't notice the "leading axle" part. That's definatly wrong. I'm not so sure about the trailing numbers either.

[legacy51]

Minor details! Who knew that the 84 250r had 69mm of rake too

In all honesty, the trail numbers all seem believable. I know that the tecate #s are right and that's all that matters!