ST90 MOTARD project thread

[doopsx3]

Well some people asked me to start a build tread for my ST90/Lifan 138 'tard project so, I have been taken pictures as I go and will start uploading when I can. My idea for this project is to use a Lifan 138 that I got from Dan Crower of Crower performance. He warmed it over a bit with porting, cam, and a hi-squeezer so we shall see. I have got TT92's for it and plan on putting 2 SDG exhaust cans on it ala Ducati 996 style. I also plan on using the stock ST90 air filter assembly but I will be fabbing up a ram air system for it. Disc brakes front and rear and some type of mono shock and either FASTACE AS02's or some Pitster X4 forks..(have yet to decide)...well it is coming along so I will post the pics I got and I am also open to suggestions.....I am not a welder so plz do not laugh too much....

[doopsx3]

mo pix

bug eye light 2.5X12 rear rim...much bracing going on

[doopsx3]

even mo stuff

had to rework the engine mounts check the top shock mount...had to be removable in order to be able to remove fuel tank

[doopsx3]

some mo work

check the top shock mount...and the lower neck brace..that will also be where I attatch the 138's oil cooler and my ram air system...notice I hacked off the front of the lower frame and replaced with a flat plate

[doopsx3]

last pic of the day

gonna put another neck brace along the top...it will be made of smaller square tubing

[doopsx3]

Originally Posted by doopsx3

Well some people asked me to start a build tread for my ST90/Lifan 138 'tard project so, I have been taken pictures as I go and will start uploading when I can. My idea for this project is to use a Lifan 138 that I got from Dan Crower of Crower performance. He warmed it over a bit with porting, cam, and a hi-squeezer so we shall see. I have got TT92's for it and plan on putting 2 SDG exhaust cans on it ala Ducati 996 style. I also plan on using the stock ST90 air filter assembly but I will be fabbing up a ram air system for it. Disc brakes front and rear and some type of mono shock and either FASTACE AS02's or some Pitster X4 forks..(have yet to decide)...well it is coming along so I will post the pics I got and I am also open to suggestions.....I am not a welder so plz do not laugh too much....

notice the 1st set of pics I was thinking about using a ATC 125m e-start motor..too heavy

[Kurlon]

The shock setup in back worries me... it looks like it will be a falling rate setup, ie the more you compress it, the easier it gets to compress. If the shock has enough travel, it could end up getting to a point where it'll suddenly try and pick the swingarm up and hold it up once the lower mount moves far enough forward. What you want to do is try and lay the shock down more. If you can find someone who can weld aluminum, you could have it be an asymetrical setup like the Kawi ER-6n, shock mounted on the left side of the frame, bolting to the left side of the swingarm. No idea if the swingarm has enough torsion resistance to work that way or not?

[doopsx3]

Originally Posted by Kurlon

The shock setup in back worries me... it looks like it will be a falling rate setup, ie the more you compress it, the easier it gets to compress. If the shock has enough travel, it could end up getting to a point where it'll suddenly try and pick the swingarm up and hold it up once the lower mount moves far enough forward. What you want to do is try and lay the shock down more. If you can find someone who can weld aluminum, you could have it be an asymetrical setup like the Kawi ER-6n, shock mounted on the left side of the frame, bolting to the left side of the swingarm. No idea if the swingarm has enough torsion resistance to work that way or not?

which pic of the shock are you talking about Kurlon...the pics in the 1st set of photos are not even in the place I was thinking of mounting it....go to the newer pics with the fastace BS-66rc

[doopsx3]

here is the correct mock up pic Kurlon...this pic has the 138 mocked up in the frame too

http://www.planetminis.com/attachmen...0-dscn5403.jpg

[doopsx3]

Sorry Kurlon..took me abit to get it linked

[Kurlon]

Ah, that looks better. Does it rub the frame when you compress it?

[doopsx3]

Originally Posted by Kurlon

Ah, that looks better. Does it rub the frame when you compress it?

naahh I opened it up enough later after that pic was taken.....yeah, those 1st pics the bike still did not have the cut-out in the back splash so the shock would sit right...it was a pure balacing mock up.just to get an idea.......but I think the way it sits now will work without the shock trying to go under itself (so to speak)

[dsrt4]

Looks neat!

What Swingarm are you using? Or did I miss that?

[doopsx3]

Originally Posted by dsrt4

Looks neat!

What Swingarm are you using? Or did I miss that?

yep missed it..see the linked thread

its a 17.5" mono swinger

[TankTheory]

You sir, are creating one monster of a bike. Btw, nice welds.

[doopsx3]

in the 1st set of pics it shows that the bike sits high...but really it does not...in the linked pic you can see about the ride height it will be

[dsrt4]

Originally Posted by doopsx3

yep missed it..see the linked thread

its a 17.5" mono swinger

I See that.... What Bike is it from or brand?

[bigluelok]

dude how dpi ypu put the dirt bike rim and tire on the ct70 or the z50

[s_10onbagz]

XR, XL, and some ST's had Spoked wheels if I am not mistaken. They should be pretty much bolt on. If I was going with spoked wheels on a budget, I would run a CRF70 front end(triples, forks, wheel, brake, & axle), and XL70/XR80 Rear end(swing arm, shocks, brake rod, brake, and wheel). You could throw the whole setup on a Z50, and it is a completely bolt on Spoked wheel setup that will raise your bike and extend your wheel base.

[bigluelok]

about how much would that set up cost? i want one where can i buy it from?