Comments on: DT / MX Motor Swap Fail

By: m latham

m latham — Tue, 13 Oct 2020 09:24:07 +0000

Been there dun it dt175 2k4 fits into 1g1 frame or 1f9 frame easy. My bike was UAB 6R. engine chain cover needs to be modified. rear wheel and sprocket needs to be changed to mx wheel or make spacers for new sprocket.

By: ADNILSON NOGUEIRA DENIS

ADNILSON NOGUEIRA DENIS — Sun, 18 Nov 2018 23:09:47 +0000

Amigo a caixa de macha da mx 175 se encaixa na RT180?
caixa da RT180 MUITO RUIM

By: ken

ken — Thu, 14 May 2015 18:46:24 +0000

That looks like a neat swap,everything is close enough to make work. A direct fit would be a 75 mx 175 if you can find one, way more power due to its head, porting, and pipe which will also fit the dt chassis. No sixth gear though,that was the year before the first monoshock yz. Raced one of those for a season, pretty good machine.

By: Carson

Carson — Sun, 22 Feb 2015 05:15:21 +0000

If you ever think of going the route of a custom pipe. I know a dude down here that builds all flat track bikes and motors in our area, dude really knows his shit, he builds custom 2-stroke pipes for racing and shit. He’ll make you an awesome pipe.

have you put the boysen dual stage reeds in that thing yet? I’ve got em in my DT400 and you can definitely tell the difference on the bottom end in the power band.

By: Frank

Frank — Tue, 17 Feb 2015 23:38:57 +0000

It’s a little bit involved, but if you have access to a lathe ( I didn’t see one in your shop pics) it can be fairly simple.
You find two sprockets, one with the gearing and chain size you plan on running, the other is to match the splin on the MX engine.
Then, carefully anneal the centers of both so they can be cut in the lathe. Some aftermarket sprockets may not be quite as hard as the factory ones so you may be able to cut them without softening.

Cut the center out of the outside sprocket (#1) you are using. Then outer off the spline portion of the other (#2). They should be cut to clearance of slip fit, so you can ajust for runout. Slip #1 over #2 with the amount of offset you require.
Set up on a flat surface, check runout, weld. Tacking first.
Making sure you have clearance with the case is good to check before welding.
The welding process should generate enough heat to get some “hardening” back if you quench it in water immediately after welding.

Drag racers in the 70’s would do this for running wider slicks.

By: Adam

Adam — Tue, 17 Feb 2015 20:31:03 +0000

Hey Frank, the sprocket needs to sit closer to the engine to take up the 1/8″. If there was clearance and the chain doesn’t hit the motor, how would you go about making an offset sprocket?

By: Frank

Frank — Tue, 17 Feb 2015 19:45:54 +0000

Which way is the sproket off? You might be able to weld up an offset sprocket for only an 1/8″.
Looks like it would be a great upgrade though.