Zongshen RX3 carbureted version mods & repairs

[FTEY]

Hi, this thread is for all members to discuss about the technical aspects of the carbureted version of the zong rx3. Be it the engine, how the card work, how to meddle with the carb.... And many more. Here are a few photos of the engine from the carburetor version of the bike. Minbe is a KTN RS3(Malaysian version)







The lever for spare gas

[FTEY]

Tried looking for te screw to the pilot jet just but cannot determine which was it..... Any idea from the engine pics

[Weldangrind]

I can't see it. It might be under the carb, similar to a Mikuni or Keihin round slide.

[Weldangrind]

I looked through a few pages at Taobao, but I didn't spot a carb. If you could find one cheap enough, you could experiment with it and leave your stock carb alone.

Can you use a mirror and get a picture of the underside of the carb?

[SpudRider]

Originally Posted by FTEY

Tried looking for te screw to the pilot jet just but cannot determine which was it..... Any idea from the engine pics

Look under the carburetor for the PMS screw. Is there a brass cap or a screw located inside the red circle shown in the photograph below?

[SpudRider]

Check for a brass cap, or a screw at this location.

[Weldangrind]

Way to go, eagle eye!

[FTEY]

The carb is a Keima PD36J.
Could this be the cap that we were looking for?

[katflap]

Seems to be the same as a replacement carb that's being used on the Yamaha YFM 400. ( I think its some kind of quad bike )

http://www.amazon.com/gp/product/B00...4J2RKK6ZBHA4FT

if this is the same as yours then this exploded carb diagram maybe of use

http://www.yamahapartshouse.com/oemp...9a4/carburetor

[SpudRider]

Originally Posted by FTEY

The carb is a Keima PD36J.
Could this be the cap that we were looking for?

I don't think so. I think the PMS is probably located inside the yellow circle.

[FTEY]

Originally Posted by SpudRider

I don't think so. I think the PMS is probably located inside the yellow circle.

Based on your guess and also the blown up diagram from katflap, i think you got it....in a way, it's actually hidden.
So I should be sticking the screwdriver into this hole shown in the yellow arrow.

[katoranger]

Yes. Turn that out. Maybe a 1/2 turn.

[SpudRider]

Originally Posted by FTEY

Based on your guess and also the blown up diagram from katflap, i think you got it....in a way, it's actually hidden.
So I should be sticking the screwdriver into this hole shown in the yellow arrow.

Is the hole covered by a brass cap? If so, you need to remove the cap first. Have you verified there is a screw inside the hole? If so, that screw is very likely the PMS.

You do adjust the PMS with a small screwdriver. You first need to discover the present setting of the PMS. To do so, slowly tighten the PMS, counting the number of quarter turns until it lightly touches bottom. Don't overtighten the PMS. You merely want to count the number of turns until it lightly touches bottom. For example, you might need to turn the PMS 2-1/4 turns until it lightly touches bottom.

After you record the number of turns needed, loosen the PMS counter-clockwise until you return it to the initial position. Report back, and I will tell you next step.

[SpudRider]

Originally Posted by katoranger

Yes. Turn that out. Maybe a 1/2 turn.

I'd like him to count the number of turns first, so he knows the initial setting, Allen.

[FTEY]

Have not verified if there's a screw in there.
At work now. Will need to get back then I can take a look at it.