Cant get my exhaust valves perfect....
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Danbot
Well-known member
Oven cleaner, and lots of it!
Short of taking them to a bench grinder with a wire wheel, I think the oven cleaner does a pretty good job. The less scratches you can leave the better.
In my mind, they need to be cleaned at least once a year anyways, probably twice, get them as good as you can and chuck em back in!
Short of taking them to a bench grinder with a wire wheel, I think the oven cleaner does a pretty good job. The less scratches you can leave the better.
In my mind, they need to be cleaned at least once a year anyways, probably twice, get them as good as you can and chuck em back in!
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SwitchbackRick
Member
I just finished doing mine...had the same problem...the oven cleaner got the top layers off, but found if I soaked them in break cleaner, it got right down. Still a little pitting and carbon. Letting them sit over night next time. How tight are the gilotines supposed to be in the bore?
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t hillrider
Member
River can you elaborate on this please. Sounds like this might be my problem running WO. Ive had this suspicion for a while but am not able to prove it. Any ideas on how I could tell if the valves are not staying open at full throttle ?
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Danbot
Well-known member
Run it on a stand with the hood open, you should be able to see the "nipples" on the bellows nuts protrude through the hole in the black plastic caps.
Or you can plug the VES hoses from the valve bodies, and take it for a run. The VES solenoid can get gummed up and not fully seal, this test will bypass the solenoid. (you can also watch the nipples on the stand with the plugged hoses for comparison)
Hope this helps, Dan
Or you can plug the VES hoses from the valve bodies, and take it for a run. The VES solenoid can get gummed up and not fully seal, this test will bypass the solenoid. (you can also watch the nipples on the stand with the plugged hoses for comparison)
Hope this helps, Dan
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otterpoo
Member
Is it advisable to leave the hoses to the VES plugged permanently?
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overkill131313
Member
so pull the hose off the VES and just plug it? and plug the nipple on the VES or does it need to breath?
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otterpoo
Member
8) Plug the exhaust purge hoses coming off the exhaust valves, this makes it like the 2001-2004 set-ups and definitely improves acceleration by allowing the exhaust valves to open sooner. An added benefit is the hot exhaust that was "held back" in the engine is released sooner, thereby effectively reducing internal engine temps.
I found this under Increase Your IQ.
I disconnected the two hoses from the exhaust valves at the T connector before the silenoid hose and blocked them off using a 5/8 bolt with the head cut off with two O clamps to help them keep together. The two ends come together at the ends and connect to the VES. The silenoid hose just let empty into the engine bay.
I have not really had a chance to try this out yet to tell if it had any effect on performance. I did take it on a very quick run on the lake but had only shore snow drift to play on. You can't get anything in a short distance with these 900's.
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BIGGDAWG
Well-known member
should be riding mine tomorrow night with mine plugged. cross your fingers for me. hope it runs good going to try for a 30-40 mile trail ride to the girlfriends house
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jskattum606
Well-known member
Let us know how this works. Interesting
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Danbot
Well-known member
Ive tried it, and posted my results in the original thread over in the IQ sub.
Elevations from 3000 to 8000 feet, and conditions from deep and dry powder to hard packed trails. I find the engine revs up a bit quicker with the hoses plugged, and you can tell by exhaust note that the valves are capable of partial opening making them more of a "ves" than stock. It just felt all around more peppy and responsive to me.
Elevations from 3000 to 8000 feet, and conditions from deep and dry powder to hard packed trails. I find the engine revs up a bit quicker with the hoses plugged, and you can tell by exhaust note that the valves are capable of partial opening making them more of a "ves" than stock. It just felt all around more peppy and responsive to me.
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