ATC 90 Build with 140cc engine

[86trizinger]

I know there are tons of build threads around.. Haven't seen any threads with the lifan style engines used.

A lot of people said go with the 70 frame but I decided to go with the 90 frame instead because I had almost everything to get this up and going.

Here is what I am working with:

-ATC90 Joker frame
-YX 140 cc engine.. The side covers were cracked when I traded for it so I ordered a set of piranha -covers because I could get those the cheapest.
22mm carb
Pit bike exhaust
-Aftermarket triple trees
-Older Dirt Bike forks
-Rear disk brake

Went in pretty easy. Pit pit exhaust fit perfectly with a little bend.
I still need to Finish a lot.

[86trizinger]

Overall I like the way it sits. I plan on raising the back fender up about an inch or 2 .
I may go with some shorter forks so I don't have to push them through the triple trees.
Also the triple tree seems very wide, but they ride so much better then no suspension at all.

Still have to find a rear caliper and master cylinder.

I have more parts supposed to be here hopefully before the week end.
Braided clutch and throttle cable plus a 1/4 turn twist throttle.

I am not trying to build a show bike , this is going to be a nice bike to ride on the trails with my kids.

[Jeepermc]

Cool! show us more!

[Vealmonkey]

There has only been 1 other build with a stock 90 frame with a gpx engine. And that trike is on its' 2nd or 3rd owner now. The original builders board name is edog. Look for threads started by edog and you should find the build thread.

[atc350xer]

bigger too... I have a new appreciation for the lowly 90

[86trizinger]

for brakes I plan on using the same parts a 200x would interchange with.. Cr85 master cylinder and front caliper. I will of course need to have pretty short hose made.

[JohnR.]

No need to have a hose made. You can buy #3 AN lines with ends already on and you can get 10mm banjo to #3 AN fittings from Earl's. I made my own for the extended swinger on my T3 with parts I bought from www.behrents.com. The manufacturer of the lines is BCE. They come in a ton of different lengths and it ends up being cheaper to make your own than to buy one already done.

John

[86trizinger]

Locally I can have one made for less then $30 . Probably isn't worth it to make my own for that price. I just need the caliper to come so I can build the mount for it. It will bolt using the 3 bolts that hold the axle in place.. No modifying of the frame will be needed.

[JohnR.]

That's about what I paid to make my own stainless one. No real work involved, just screw the two ends on and have at it. Nice build, I'd bet the extra room on the 90 makes it a bit more comfortable than a 70.

John

[86trizinger]

Cables came today.. they stuck them in the mailbox after 5pm so I just now found them.. Hopefully they will go on tomorrow.
There is no place for a grab bar or exhaust mount on the frame. So I have to figure that out still.. But I don't want to weld to the frame.
It should be all up and running by next weekend hopefully but still need brake parts before I can complete the assembly.

Almost forgot I need a kill switch.

[Vealmonkey]

You are wrong about the grab bar. A stock grab bar fits fine, that is what I had on there.

[86trizinger]

I totally was looking at it wrong.. was thinking of how the 200x grab bar mounted. I plan to weld a bracket off of the grab bar to hold the exhaust.

[86trizinger]

I got the new 1/4 twist throttle mounted, but not totally happy with it. Its gonna require some adjustment to be perfect. The braided brake and throttle cable do look good though.

I couldn't resist. I had to plug the harness in and throw some gas in it.. It started on the 1st kick.. It sounds pretty mean, a lot better then my 200x. I didn't get to ride it yet since I am still working with the rear brake conversion. Hopefully I should maybe have a video of it this weekend running around the yard even though the brake will not be done.

So far I only have about 5 hours total in the assembly including all new bearings and making a new front axle.

[Vealmonkey]

As far as welding a bracket to the grabbar for the exhaust, I wouldn't do that. You are better off figuring a mounting method that is unboltable. A padded clamp on the grabbar and a clamp towards the end of the exhaust should do you pretty well. Or you could always a longer bolt through one of your grabbar bolts and attach your clamp and a couple extra nuts and washers to that. Sometimes grabbars get bent and it reallly wouldn't be the best place to mount the exhaust to the grabbar.

[86trizinger]

Good point. I will not have any more time this week though until late Friday night.