slide leak flatslides

Joined
Jul 24, 2014
Messages
8
hey,
i went and got one of them okos and had a bad problem. where, the slide, pushes back and forth in the chamber. had quite a big bang it would do. lots of play. so i was new to it. tried to tune it. kept breaking up when i would rev teh throttle back to get it to work. way i figured it out, was, i walked by it one day idling and touched the throttle cable. it was set up right. slide lowered cut off and cable adjusted with 1/8 inch of slack, so you know the throttle cable was on right. i hit the throttle cable as i was walking by and i heard the bike start to idle higher. and jump around and stuff. i wondered what just happenned, then i noticed i had touched the cable as i went by it. i was sitting there, just poking on the cable, touching it, and the idle would jump around.

took carb off, and the slide had some forward and back play. this was a flatslide, D-slide carb. had quite a lot. i tested this by sucking on the side the engine would suck on, if you pushed the slide it would be stuck ot the back. if you pushed the slide from the air filter side, it would bang forward, quite a bit. when i sucked like the engine would through the carb, a lot of air was going around the slide. i had closed the slide too using the RPM screw. so when i walked by it it was moving the cable in the slide bouncing it around a little, just jolting it barely, and the slide was jarring around. makign the idle go up and down.

so i returned it. so polini makes their own copy also. i figured their from italy should do good. So I tried one of them

alright long story short the guy at sudco thinks he knows everything. its good and it does that. its better.
the polini also had a little bit of play. i noticed. i noticed this stuff thats why im saying here. i noticed the slide play back and forth, not as much as the oko. it had maybe a fingernail of play. the oko was like, 1-2mm or something about of play in it. the polini i could just stick my fingernail in behind the slide as i pushed it forward, engine side, from behind. where it sits in there.

my question. does anyone else had a flat slide carb, can they test it out? is it supposed to have this play? how am i supposed to tune it? i cant figure it out.
i have a round slide carb but its too small for this bike, but as i test it, doing the suction test, the slide has no play, and there isnt quite any air comign from anywhere but the pilot jet hole. if any air is seeping, its barely seeping. its got no room for air and sudco guy was telling me they need room. i think they should be firm in there. does anyone else have to to check for me? or anyone know anything about this?

thanks.
 
Doesn't matter WHAT carb. Not the brand, not the model, not the age.

A carb's slide should be smooth and stable in it's bore at all times.
 
ok. i see the problem. when its not raised up if its not stuck forward, which, rarely happens. it will run in the idle stop rpm screw, stop position. which means, idle rpm screw turn all the way, out. until the throttle stop hits the bottom. beceuaes theirs enough air to keep it running. the play, is left right. its going left, into the intake, right out, to the airfilter. if i pushed from airfilter side in the chamber, on it, it pushes, about a fingernail. that air is making it difficult to tune and off throttle breaks up.

so thats whats happenning. the air comes around the side of the slide. because its not secure forward and back. if as i look down the chamber. left right, look, down the chamber, is fine. thats where the air comes aroudn cause it needs play to move up and down. probably the same for forward backward, but no play. cause its leaking air.

thats, not what sudco told me, then i openned the thing and ran it. great. at least, if i ever get the company on the phone they should have a warranty.
 
If there is enough air leaking around the slide to allow the bike to idle, you are risking it being too lean because there won't be enough fuel for a proper mixture.

You need a new carb or the right slide, or SOMETHING to fix that problem first.
 
ok. well, thanks. you have to understand my reluctance to believe even thou, i want to real bad. because, thats the direct opposite of what everybody else told me. when i was asking for help.

the people i bought it from didnt even want to help me when i asked, i was wanting their tips, or maybe they could of done some measuring for me, or compared to other pieces. i didnt know what to do, and when asked, they said, just return it.

now they havent even mailed me back on an rma or warranty on this one. i was told i can close the slide and the bike still idles, thats bad right? and they would say, uh well no not exactly.
which goes against any thing a carb getting tuned, does. and then the sudco guy said, this is better.

im sure a carbs circuits arent made to not be able to be closed. the carb was faulty and these guys i think have been hunting me bad parts, maybe not, but i think some to just keep me from riding my bike.

the slide gets closed, and most of the time, it still runs. the first carb, of the flatslide kind, wouldnt stop running with the slide shut. this one, will still run, but not all the time, cause the slides just a little loose.
and i just dont want to say i know everything about a carburetor, because from what ive read, these guys have been using them, forever on a bunch of bikes. but it goes against anything a carburetors circuits reacts like. goes against how a carbs tuned. they told me it wont shut off, i was like how does it quit and they where like its like this its better it does this.

i believe you its just that ive never seen a bike tuned like this before. ive seen, 2 carbs, 1 from a high quality manufacturer, and a cheap knockoff, and ive never seen a working one. the, place i bought it from, never answers any questions i have to him. on helping to tune.
 
ive seen so many of these, it needs to be brought up to the :edit: attention, : of the manufacturer.
 
i got a refund from the seller. I'm glad. I think these leaky slides need brought to the attention of manufactuerers who manufacture flat slide or d-slide carbs. they need airtight seals to run right. if you let off the throttle, it needs to close the slide. not have gush of air coming round the slide with only the pilot jet for a jet sending fuel there.
 
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