zenaoh 26cc problem

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nightwolf24

nightwolf24

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hey all ive managed to get my zen 26 started but problem ime having is when i brake engine cuts out ime using the throttle trim to keep the engine going and a slight touch of the low speed needle anticlockwise and again cuts out what position should the throttle arm be in,and how can i stop the engine cutting out when i brake.oh and also the idle screw don't semm to do anything ime using a brand new walbro 668 carp
 
youll need to adjust the idle screw. on the side of the carb, you have the H needle and the low needle on top next to each other.
just below them is a single large screw head. that is the idle adjust screw. turn it clockwise so it moves inward. that will push against the throtle plate, and open it up, which will raise the idle. the more in you go the higher the idle.

set the screw so the idle Just starts to go up. then hit the brakes. your motor should idle.

on your linkages. be sure you gas linkage, and set there, and the brake linkages do not try to PULL the throtle closed while braking.
 
i know where the needles are and what do what, but i dnt know what one to adjust to stop the problem the idle dnt seem to do alot at all when turning clockwise or anti clockwise.ile try turning the idle screw clockwise then and see if i see a increase at all thanx.see on my old mutilator the throttle arm was in the middle position should it be right back towards the filter \
 
No luck with the vid, my Xcan is loose, so the idle won't stay in one place on mine. Cant make a how to vid if the damn thing won't stay running.

So here is next best thing...

Loosen the set screw on the throttle arm collar. This allows the return spring in the carb to shut the throttle plate.
Marderinthesnow153.webp

Make sure the big silver arm on the right side is closing all the way. Check this by hand. Your controller won't do anything because the throttle servo has been disconnected. You will hear it click when it makes contact with the throttle stop screw. Throttle stop screw is the big silver screw.
Marderinthesnow154.webp


Put the buggy up on a bucket or something to get the back wheels off the ground.

Prime the fuel bulb, choke it, pull it over until it pops, turn off the choke and pull until the motor starts.

Run the throttle by hand by grabbing either of the two throttle levers (one is the big silver lever on the right side of the pic above. The other has the throttle linkage running back to your servo.) Once the motor is warmed see if it will idle. If it does and everything is fine, tighten the set screw in the throttle collar and your done.

If the idle is off still let me know.
 
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You need to post up pics and videos... This isn't easy checking 500 different things, when you could just snap a pic. We could see the pic and usually diagnose the problem in 5 seconds...

Are you talking about this?
Mutilatorcarbswap0055.webp
 
Trip said:
You need to post up pics and videos... This isn't easy checking 500 different things, when you could just snap a pic. We could see the pic and usually diagnose the problem in 5 seconds...

Are you talking about this?
Mutilatorcarbswap0055.webp
Click to expand...
yes thats what i mean i aint sure how to upload a video on hear has it gota go all the way back then
 
hey trip ive done it with your help thanx for your time and effort i ended up turning the idle nearly all the way in i just hope it starts when its cold but again thanx man your ace
 
Turning the needle in all the way? Which one the big silver idle adjustment screw or the LS needle?

Ls needle should be around 1.25 to 1.75 turns out from a fully seated position.

As far as posting a vid on here, just upload it to youtube, then save it as a bookmark then drag it in the dialog box. (where you type is the dialog box)

That's all there is too it.
 
Trip said:
Turning the needle in all the way? Which one the big silver idle adjustment screw or the LS needle?

Ls needle should be around 1.25 to 1.75 turns out from a fully seated position.

As far as posting a vid on here, just upload it to youtube, then save it as a bookmark then drag it in the dialog box. (where you type is the dialog box)

That's all there is too it.
Click to expand...
ok will do i meant the big silver idle screw
 
If you pull that idle adjustment screw out and inspect it, you will see the point isn't very wide, so after a few turns in it doesn't raise the idle any higher. If you have the idle adjustment screw (silver) cranked in and your idle isn't improving then you have the LS needle too rich.

Warm the motor by running it for a minute or so.
While the motor is warmed and running. Turn the LS needle in (clockwise) until I get the highest idle speed.
Once you find the highest speed, then back it off about 1/16 turn (anti-clockwise) then adjust the big silver screw out (anti-clockwise) until the idle is acceptable.

You adjust the high speed the same way, but you have to have the throttle wide open.

But for now, you will need to get the thing to idle.
 
If you pull that idle adjustment screw out and inspect it, you will see the point isn't very wide, so after a few turns in it doesn't raise the idle any higher. If you have the idle adjustment screw (silver) cranked in and your idle isn't improving then you have the LS needle too rich.
Click to expand...


exactly what i was just going to say, but i don't have to, so you all get to read this dribble. lol

but yes, if your idle screw is pretty much set all the way in (wont turn in any farther) and your idle is still low, your l needle is rich Or you may have a spark plug just beggining to foul out, but im going with too rich low needle.


before he restarts Trip, he should probably just reset the L needle to the stock settings. that may solve the low idle issue now. before you restart the motor again. turn the Low needle slowly and Genltly clockwise until it stops turning. DO NOT TIGHTEN, you only want the needle to stop turning, if you try to snug or tighten the needles (L and H) you ll damage the seat, and mess up the carby. once its all the way in, turn it Counter Clockwise out to 1 1/4 turns. now restart, you will Likly need to turn the Idle screw Down a bit to lower the idle with the low needle set at stock setting.


as you turn the low needle in, count the turns it takes to stop moving. Im estimating you ll be about 1 1/2, maybe 1 5/8ths of a turn open on the low needle, which is way way rich.

don't take it personally if i or others give thurough instructions or seem to dole out what seems to be just general info. but being online, its hard to estimate someones mechanical knowlege, and more importantly their Mechanical SKILLZ (i know ALOT of colledge educated idiots). its just we want to be sure you have an idea what to do, if your one of those people that just have no idea. lol
 
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Timmahh said:
exactly what i was just going to say, but i don't have to,
before he restarts Trip, he should probably just reset the L needle to the stock settings. that may solve the low idle issue now. before you restart the motor again. turn the Low needle slowly and Genltly clockwise until it stops turning. DO NOT TIGHTEN, you only want the needle to stop turning, if you try to snug or tighten the needles (L and H) you ll damage the seat, and mess up the carby. once its all the way in, turn it Counter Clockwise out to 1 1/4 turns. now restart, you will Likly need to turn the Idle screw Down a bit to lower the idle with the low needle set at stock setting.


(i know ALOT of colledge educated idiots).
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I agree, but I have to add one thing, get the back wheels off the ground before you start it. If the throttle is half open from the idle set screw the brakes won't stop the car.


You know what's funny about this? You spelled college incorrectly, I am wondering if you were being funny? :lol:
 
Trip said:
I agree, but I have to add one thing, get the back wheels off the ground before you start it. If the throttle is half open from the idle set screw the brakes won't stop the car.


You know what's funny about this? You spelled college incorrectly, I am wondering if you were being funny? :lol:
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thanx for all the advice ime like a sponge its all new to me and i apreiciate peaple helping so ive got it sounding ok but every now and again it cuts out and there is fuel from the exuast so i presume it is too rich like you both tell me its just ime scared if i try changing any thing then it wont run it doesn't seem to bog or splutter and as for spelling ime terrible as youve probly already noticed lol, but i will try what you say soon, is right for the wheels to spin when adjusting the L speed needle if so do i just adjust the idle then. ile do i vid soon and post in on the tube thanx again.
 
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Put up a vid... We can chase the problems on here for the next week with just posts. A vid will tell us what your problems are.

No the back wheels should not be spinning while it idles. Sounds like your idle is too high.

This is my Mutilator with the stock 23 and an X-can. You should be sounding pretty close to this.


Don't worry too much about the spelling, this is an r/c forum, not a spelling bee competition, as long as you are close, we'll get what you mean. But if you are worried about it, use your spell check.
 
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Trip said:
Put up a vid... We can chase the problems on here for the next week with just posts. A vid will tell us what your problems are.

No the back wheels should not be spinning while it idles. Sounds like your idle is too high.

This is my Mutilator with the stock 23 and an X-can. You should be sounding pretty close to this.
http://www.youtube.com/watch?v=D7Ysg7OzRBU


Don't worry too much about the spelling, this is an r/c forum, not a spelling bee competition, as long as you are close, we'll get what you mean. But if you are worried about it, use your spell check.
Click to expand...
cant watch the video for some reason saying ive got to add you as a friend but ime already friends with you on hear.my you tube name is nwolf22
 
so ive put the vid up but it gets dark over hear early so its the best i could do let me know what you think hear the link....

 
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It's lean... Hear how the motor sounds flat and bland. That is the sound of lean. Easiest way to tell was the bog when you hit the throttle.

Back the ls needle out 1/8 and I bet it will be dead nuts. but before you do that...

The easiest way to adjust that, is to back the ls needle out while the motor is warm and running, keep backing the needle out until the motor starts to have a "POPPY" "Raspy" sound and the rpm will increase. Keep backing it out until the idle stats you slow. Take note of where the needle is at this point.

Then turn the ls needle back in, the rpm will start to increase then it will start to drop, as soon as it starts to drop again go back the other way half the distance that you turned previously. Keep going back and forth until the idle rpm is the highest. )You are only going to be turning 1/8 to 1/4 turn at maximum.)

Once the rpm is the highest... Back the ls needle 1/16 turn anti clockwise and you should be set.

Now set or idle stop (silver screw) to the idle that you like and your done.

Does this make sence to you?
 
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