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Rev Carb Slides Worn


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#1 n-mod

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Posted 11 January 2017 - 12:18 PM

I have high idle on my 03 mxzx 800. I have done everything besides the slides(jets, adjustment screws, idle adjustment, crank seals, boots, etc). Which leads me to the carb slides. What causes the high idle with these?

 

Is it the groves allowing air thru?

Is it the worn surface causing them to hang up?

 

I purchased a used set hoping they would be better, but they are not. These are pretty worn down, I can feel the missing material on all slide. I know coating is an option, but I would probably need better shape slides. Can I just sand the face down flush, then coat? Any at-home coatings I can apply? There has to be a better solution to high idle.



#2 KurtM

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Posted 11 January 2017 - 12:23 PM

Swaintech has done some slides for people on here. They do all kinds of ceramic coating and are pretty reasonable
Kurt

#3 n-mod

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Posted 11 January 2017 - 12:29 PM

Yes, I'm already in contact with Swaintech, but the coating is very thin, is this coating to fill the gap, or just make them slide better?



#4 Mach189

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Posted 11 January 2017 - 12:34 PM

I replaced mine with OEM, wasnt cheap obviously but the high idle is gone..........for now........

 

20 pilots and 1.75 turns on the screws. 



#5 Mach189

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Posted 11 January 2017 - 12:36 PM

Did you replace the slide links? I think it was Doo_Tint who made some heavy duty ones out of brass/copper?  Maybe he will chime in. He also had his chromed. 

 

EDIT: He had some billet slides made and had them chromed, now that I think about it. 



#6 Mach189

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Posted 11 January 2017 - 12:42 PM

Carbs are synced properly also?



#7 n-mod

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Posted 11 January 2017 - 01:02 PM

I'm going to rip the carbs out again tonight to check everything over. I will swap any worn part with my spare carb for hopefully a better condition part.

 

I don't remember if I checked the slide links last time, I do remember a spring being worn. I wonder if there is a way to add an additional spring to apply more downward pressure to the slide. 



#8 Sumrof69

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Posted 11 January 2017 - 04:58 PM

Ya my wife got fed up with the hanging idle thing, on her sled, putting new slides and carb boot's in it, GEEE sledding is so much fun 



#9 Mach189

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Posted 11 January 2017 - 05:14 PM

I also wonder if the Boyesen rage cage set I put in helped. My kimpex boots sealed but I wonder if the stiffer boyesen reeds arent allow air the seep past, like my OEM reeds were weak/worn?

#10 n-mod

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Posted 11 January 2017 - 07:45 PM

Just pulled them apart. Wow I don't remember them being in this bad of shape. One slider spring was missing. The other I bent into shape last time after the end came off. I have extreme up and down play in the slides. The engine side wall is completely worn flush. Take a look at the photos. I included my donor carb parts for comparison. Donor isn't great, but it's much better. Can the slide links be shimmed sideways to get out of the groove they have worn?

 

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#11 TwoRevs

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Posted 11 January 2017 - 08:10 PM

Build the best set you can out off both before spending too much money.

 

That missing spring was probably the most contributing factor regarding your high and inconsistent idle.

 

seen it before 



#12 TwoRevs

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Posted 11 January 2017 - 08:15 PM

Build the best set you can out off both before spending too much money.

 

That missing spring was probably the most contributing factor regarding your high and inconsistent idle.

 

seen it before 

I use a little high tack grease on those tiny spring shafts now..every year..  lol.

btw 



#13 n-mod

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Posted 11 January 2017 - 08:53 PM

That missing spring was probably the most contributing factor regarding your high and inconsistent idle.

 

I highly doubt that spring would cause it. I believe the spring is just to dampen the vibration of the slides. Most likely the slides were hanging up on the lip of the casting which it dug into. The slides have nearly .5mm of material missing. The matching face does as well.



#14 TwoRevs

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Posted 11 January 2017 - 09:07 PM

I highly doubt that spring would cause it. 

you wouldn't think so.

but it does.. especially with egged links



#15 ronbourd

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Posted 11 January 2017 - 09:11 PM

there is no oil to lubrificate the trottle slides, and even brand new, they are not a precise fit. Mi opinion, this is a cheap carburator.






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