Ok, I got my truck running by setting the lsn to about 1 turn out (factory is 3), and the hsn to about 1.5 out (factory is 3.25). But now I have another problem. Whenever I hit the brakes the truck dies. It completely closes all the holes in the slide of the carb. I would think that maybe it was a clutch problem if it werent for the fact that it is getting no air. How do I adjust that? I can post pics if need be.

take the horn of the servo and adjust it then put it backon

adjust your idler screw on the motor so it doesn't go underidle....dn't mess with the servo horn cuz htne yur gonna get your brakes all messed up and stuff....and it sounds like your engine is gonna be running extremely lean...make sure its got a nice stream of blue smoke.....

I do have a nice stream of blue smoke. You mean the idler screw on the carb dont you? If so, I have unscrewed quite a bit right now cause it idles real high if I dont. If I hit the brakes, should the carb on a rotary valve carb should open up on the left of the slide should it not? On top of the slide is where I have the opening when it is at idle. When I hit the brakes it completely shuts this opening.

What he means is adjust the idle speed screw, not the idle mixture screw that controls the fow of fuel. Idle speed should aways be set with the screw that stops rotation of the throttle barrel so that it prevents what you are describing from happening. Normally it will be a black screw with a spring under it and its location will be next to the carb air opening. Screw it inward to prevent the throttle barel from closing all the way.

FYI, slide carbs are similar in adjustment but the idle speed screw on some can be confused with a midrange needle valve.

If you can't figure it out from this then post a pic of your carb and maybe we can help more.

Ed M.

there is a little screw on your carburator with a spring on it, its called and idle screw, if u turn it clock wise, u make the idle a bit higher, if u go counter clock wise, then its going to be low, take your servo horn off, turn the radio on and set everything to nuetral, then put it back on making sure that if u turn the system back on the servo leaves the throttle in idle, then start the truck, and while its idling raise the idle a bit, touh the throttle a bit, keep doing that till u get wat u want

How do you determine what is neutral? Right now The top of the slide has a little opening showing. But when I hit the brakes, it completely closes this hole, and then some. Should anything be showing on the left of the slide? And about the idle screw, I am not sure what it is doing. If I tighten it down, I can move the slide at all, it locks it up. But then when I unscrew it a little is does not change the amount of travel of the slide at all. I am thinking that maybe I have the horn a long way off. What happens if I find a spot at full brake that allows a little bit of the carb opening to show and then put the horn back on the servo?

Just what type engine do you have? Does it have a rotary carb or a slide carb? What radio? Are you starting with all radio trims at neutral?

On many rotary carb engines if you screw the idle speed screw in all the way it will lock up the barrel.

Ed M.

Mach .12 pullstart, rotary carb, JR2 radio, and not sure on the radio trims. The throttle trim and the steering trim are at 0, the brg is at 85, and the stg is 100%. Here are some pictures of what they look like at nuetral, WOT, and full brake.

Darn sorry, it is a mach .15, the other was a typo.

Darn sorry, it is a mach .15, the other was a typo.

use an instruction manual to know what everyone means. there is a screw that stops the carb from closing anymore at a certain point, that is the one you need to adjust.

Yeah, that sounds like exactly what I need, but I looked at the manual and then downloaded the one from the losi site, and I cant seem to find this screw that you are talking about.

Are you possibly talking about the the throttle arm? I set where there is a screw on that and it can be adjusted. My truck instructions say that there should be equal throw in both directions when setting this up. I would think that would not eliminate my problem, but I can certianly give it a try.

alright this is the best i am able to explain this. on your carb there is a screw that you want. it is adjustable. it stops the carb from closing past a certain point cuting off the air. ig you adjust it to stop the carb to a point that it is open then you can press reverse on your remote and the spring will engage and your carb will stay open and your engine will continue to run.

Look at the top picture. Just below the carb opening at about the 5 o'clock position (partially covered by the brake linkage) is the idle speed screw. If you screw it in.....clockwise.....the idle speed increases. I think you can guess what hppens if you screw it out, the barrel closes off.


You also have some linkage mechanical adjustment to do because at neutral you already have the throttle/brake over ride spring fully compressed.

Ed M.