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Carb slide sticking

PostAuthor: ironhorsecustomz » Sat May 12, 2018 11:23 pm

Ok so got my bike running perfectly this morning shot down to Dallas from Oklahoma City made it all the way back to New Castle ok bike went to acting like crap spitting and sputtering off idle round quarter throttle pulled my carbs off again....I noticed that front carb slide is hung up it ain't moving all that easy and when I move it up with my finger it does slide back down....can this cause my problem the diaphragm is fine no holes just the slide won't drop once it moves upward doesn't matter how far either weather 1/4 1/2 or all the way up it gets hung up and won't drop back into place

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Re: Carb slide sticking

PostAuthor: Flyingdog » Sun May 13, 2018 2:37 am

ironhorsecustomz wrote:front carb slide is hung up it ain't moving all that easy and when I move it up with my finger it does slide back down....can this cause my problem


Yes...that can cause problems and is usually missed when rebuilding these things. Gotta pass the "clunk" test. Meaning, pushing slides up, removing finger, slides should "clunk" back down. First you wanna besure the needle isn't bent and has a losey feeling in the slides. Slight up and down feel. Remember, they're spring loaded. You can use something like Brasso (brass & chrome polish) to clean up any varnishing on the slides and/or needle, itself. Never use sandpaper on the slides. You can use #800 up to #2000 grit emery paper, with WD, to clean the bores up. Use "only" an up and down motion on these bores.
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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Sun May 13, 2018 9:32 am

Ok so this is what I found this morning I moved the stuck slide all the way up and it fell about half way I pulled the slide all the way down and it sprung back up some while holding the slide down it's sounds like it's releasing air...like it's holding vacuum up in the diaphragm...what can cause this


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Re: Carb slide sticking

PostAuthor: Flyingdog » Sun May 13, 2018 11:59 am

Check those two black hoses coming off the back sides of carbs going to the right bug-eye. Those little bulbs contain foam type air filter material.. Can break down and clog up. Don't know if they can restrict the slides from moving as much as in your case. But maybe.. Blow gently thru em. They're (what I call them) air pressure equalization tubes and work in conjunction with the two holes in the bottom of slides (that face toward engine), for the slides to work properly. Be fairly gently, cuz hard airing can slam the slide upwards hard. Can be just pulled off the carbs and checked too. Probly won't hurt anything, but they (in operation) don't move that hard in the first place..so why put extra force on them..I say.
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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Sun May 13, 2018 12:22 pm

Got it that got em moving again but not damn bike won't start and I didn't mess with the carbs at all pita

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Re: Carb slide sticking

PostAuthor: Hellgate » Sun May 13, 2018 12:37 pm

I can't recall if I asked you this before, but is the inside of the tank rusty?

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Re: Carb slide sticking

PostAuthor: Flyingdog » Sun May 13, 2018 12:59 pm

ironhorsecustomz wrote:Got it that got em moving again but not damn bike won't start and I didn't mess with the carbs at all pita


What you find was the problem?

What was your bike? 700 or 750? Should correct the description. Not sure what 7001 is.
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Re: Carb slide sticking

PostAuthor: mark75 » Sun May 13, 2018 4:59 pm

and the "filter" material in the diaphragm-vent-tube turns into bits of plastic gum when they deteriorate.

besides making the slide sticky, potentially you might get a glob of it sucked into the carb... I know that's 'just what you wanted to hear'.
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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Sun May 13, 2018 7:21 pm

Hell gate yes you have asked and no it's actually in very good condition

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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Sun May 13, 2018 7:23 pm

Flyingdog.....the problem was my fault when I replaced the needles I put one of the metal cups in upside down so the return spring sat much lower without tension not allowing the slide to complete it's journey

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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Sun May 13, 2018 7:25 pm

Sorry about the description it's a 1985 xv700 didn't realize I messed up the description

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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Sun May 13, 2018 7:30 pm

I got it to start after about 20 minutes and decided to check for vacuum leaks low and behold both boots are leaking idle was up and down sprayed some cleaner and it shot to 4 grand so tomorrow morning that's what im doing next

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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Mon May 14, 2018 8:37 pm

Ok guys so it appears that it's the carb boots causing my problems it's hard to start yet again and I've got to crank the idle screw all the way up just to get a 900 rpm idle and after a moment it dies. If I hit the boots with some spray it dies almost instantly. the boots and boot gaskets are brand new and no cracks or splits anywhere that I can find is the a trick to get these to sell or did I just get a pair of crappy boots?

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Re: Carb slide sticking

PostAuthor: Hellgate » Mon May 14, 2018 8:43 pm

Are they rotated correctly to the throttle body and the head? If they are new they should just fall into place, but they need to twist them to get the angles lined up correctly. Does that makes sense?

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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Mon May 14, 2018 9:07 pm

Yeah it does and far as I can tell they are perfect cuz one side of the boot is slotted (for the inner bolt of the boot) slide that on to the bolt rotate it down slightly and put the outer bolts in so they really only go one way that's what I don't get if I spray where the boot meets the head it dies

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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Mon May 14, 2018 9:10 pm

I've actually had these things off so many times I can pull them in 10 to 15 minutes I just don't get why all of a sudden they won't seal......is it possible to use RTV high temp silicone on the boots where they meet the head?

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Re: Carb slide sticking

PostAuthor: Flyingdog » Tue May 15, 2018 1:12 am

ironhorsecustomz wrote:is it possible to use RTV high temp silicone on the boots where they meet the head?

Sure can..I use the orange exhaust rtv all the time. I've also seen when sometimes that 0-ring seal can slip/roll out of the groove and leaves a gap.
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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Tue May 15, 2018 1:57 am

Ok then thanks flying dog will try that today

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Re: Carb slide sticking

PostAuthor: ironhorsecustomz » Tue May 15, 2018 12:59 pm

Ok so I put my original boots back on and new o rings the rear cylinder sealed up pretty dang good but the front one is still leaking bike starts up fine now but still has a low idle issue and wants to die it it idles too long I'm gonna try some new carb boot clamps and some silicone if it stops raining today......this is killing me if feels like I've got a sick child lol

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