Cleaning exhaust valves, how to

stumpy2000 · Jun 13, 2009

jetfuel said:
Is there a way to test the seal while its on the sled?
like with a vacume tester? I tried both mine and they wont pull any vacume, is this normal?

if they are anything like 'doos -they work off the pressure of the exhaust gases (greater than atmospheric -@ 14.7 psi at sea level....etc) not a vacuum. i can't remember the test procedure or pressure though

:beer; supposed to fully open at something like 5-6 psi i think depends on spring rate and preload specs for your machine & application,elevation... eg.-piped sleds usually put softer rate springs to open faster,to work with the clutching etc.sometimes you can get the guilotines to clean up pretty easy with wd-40 and a stiff bristle nail brush or light polish with wd/light oil and REALLY FINE grit sand cloth (like a machinist would use to polish automotive cranks) and a "tooth brush" for the slide etc.as always it's best to start mild and work "up" with any procedure on machined parts...ya can always go to the next level- but when they're ****ed...that's it -THEY'RE ****ED!

rmk727 · Jun 14, 2009

everything ive seen is on target except the Polaris blue with no trouble Ive notseen these results before, IMO the valves would be like snot after only a few miles on 100% pol blue, I use blue marble but not totally sold on it, not saying it's not good just seems the valves get snotty after 1000 miles or so.

Hardass · Jun 15, 2009

Wyo using a ss and the other alum? they are different in weight so reasoning would say that they will open differently with the same springs.

mountainhorse · Jun 15, 2009

everything ive seen is on target except the Polaris blue with no trouble Ive notseen these results before, IMO the valves would be like snot after only a few miles on 100% pol blue, I use blue marble but not totally sold on it, not saying it's not good just seems the valves get snotty after 1000 miles or so.

The recommended cleaning interval from the Polaris Factory is every 1000 miles...

As easy as the small block engine are to remove the VES valves, 2 bolts per valve... and how much it can affect the performance... I clean mine every 500 miles or so.

If you rub a film of synt grease on the gaskets.. they will come off without sticking and needing another. I keep 2 sets of VES base gaskets on hand just in case..

I have used Amsoil interceptor, VES Gold, XPS full synth and Redine... I've experienced everything from gummed up valves to good at less than 1000 miles..

I run Castrol std 2 stroke, Injex, and Pol Blue without any issues... Plus the cost differnce is HUGE... I spend less with the std oil and that is if I still factor in the cost of my labor time.... Plus I KNOW that they are clean and working properly.

Every 1500 miles... I remove the Y-pipe, stuff some towels in there and clean the VES slot thoroughly...

Not one VES related issue to date.

mountainhorse · Jun 15, 2009

Some of the valves are Titanium, some Stainless.

The ECU and EV solenoid valve controls the opening of the VES valve on the polaris..

Hardass · Jun 15, 2009

I have an older one so there not controlled by the ecu not all are done that way.He did not state which sled he had just guessing on my part.

mountainhorse · Jun 15, 2009

My bad.... Good Catch H.A.

rmk727 · Jun 15, 2009

MH your correct on the intervals so I'm trying it on my new sled (POL blue) just to see; the cost dif is so that I can buy the wife a few goodies with the savings

guidoxpress · Sep 20, 2009

ridgeclimber · Sep 21, 2009

VES valve cleaning

The best product I found to clean the exhaust valve is carburetor cleaner made by gunk. It is intended for soaking carburetors to clean them when rebuilding them. Strip the bellows off of the valve. Soak the valves for the day and then just rinse them off in the varsol tank. No scrubbing or scrapping. They come out just like new and no scratches for the carbon to adhere to for next time.

truthrider · Sep 21, 2009

I've soaked them in Sea foam before, seemed to work well. Still had to scrub, but not to much.

ghostrider dd · Sep 26, 2009

Thanks, MH Great info.....I have done mine several times over the years...I have never replaced the gaskets. There is no oil leakage.....and they are not torn. Very careful removing...what's the advantage to using only new gaskets??

mountainhorse · Jan 6, 2010

Also...

Just like clutch springs, the exhaust valve springs fatigue over time. To keep optimum tune... replace them every 2000 miles or 2 yrs whichever is first.

Use only new gaskets BECAUSE ... compression of the old one and small tears or oil soaking can cause leaks that can lead to poor performance and reliability problems.

For the cost of the gaskets... why risk it... buy 6 so you will have them on hand for future cleanings.

Happy riding

cateye5312 · Feb 16, 2010

exhaust valves sticking problem

I was just reading through this thread and noticed someone mentioning that they had a bog problem at 5,300 rpm and wondered if it was related to dirty exhaust valves. Based on my limited experience, it could be. I had a 2003 600 RMK that was having a mid-range bog problem and we tried everything. What finally cured it (besides re-locating the fuel pump - some people may remember THAT issue!) was a sticky exhaust valve. When cleaning your valves, examine the throat of the valve body that the shaft to the guillotine passes through. On this particular sled, that throat had started to erode and was causing the valve to stick partially open. Once up to max rpm, the valve would push on by but it was definitely causing hesitation problems in mid-range and drove us crazy to find! The upshot was that the valve body as well as the guillotine (which now had unusual wear spots) had to be replaced. Hope this helps someone - kind of an old post.
p.s . the erosion was easily noticed once I started looking for it.

danduvall · Nov 14, 2010

how are you guys cleaning the hole in the jug where the guillotine slides up and down? i cleaned my guillotines very well but the holes in my jugs are still all gummy! any suggestins?!?! i was thinking of rotating the piston down below the exhaust port and laying a rag in thru the exhuast port under the ves hole and scraping the gunk out! or maybe running my small shopvac into the exhaust port as i de-gunk!

clutch man · Nov 14, 2010

mountainhorse said:
Also...

Just like clutch springs, the exhaust valve springs fatigue over time. To keep optimum tune... replace them every 2000 miles or 2 yrs whichever is first.

Use only new gaskets BECAUSE ... compression of the old one and small tears or oil soaking can cause leaks that can lead to poor performance and reliability problems.

For the cost of the gaskets... why risk it... buy 6 so you will have them on hand for future cleanings.

Happy riding

That is what Polaris recommends but i have found them to fall off in less than 1000 mile. they Are CHEAP!!!! I change mine every 500 miles. :face-icon-small-hap

danduvall · Nov 14, 2010

danduvall said:
how are you guys cleaning the hole in the jug where the guillotine slides up and down? i cleaned my guillotines very well but the holes in my jugs are still all gummy! any suggestins?!?! i was thinking of rotating the piston down below the exhaust port and laying a rag in thru the exhuast port under the ves hole and scraping the gunk out! or maybe running my small shopvac into the exhaust port as i de-gunk!

hey

Bmanmn71 · Dec 10, 2010

03 600 VES

OK,so I pulled a dummy move, pulled th valves out this summer and cleaned them, gaskets were on back order but i finally got them, just never got around to putting it all back together

Which way does the guiliteen go, I assume down towards the piston to give it more room but thought i would ask before i wreck he whole dang thing

Thank you!

and yes I know...Im a dumb@@@@

BIGGDAWG · Dec 10, 2010

you can only install them one way. if you look at the bottom of the housing the valve will only go in one way correctly.

then install with the vacuum port up.

Cleaning exhaust valves, how to

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