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Sled feels like it lost power a little bit..

Tuning

 
 
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  #1  
Old 12-04-2008
westman995
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Default Sled feels like it lost power a little bit..

So i rode the sled last night, it was fairly cold. Its got 300 main jets in it. It rode good but right when i got home it felt like it had lost a little bit of power. Right now i tried it out and it feels the same. It doesnt have that REALLY snappy low end like it had at first. I could be the track not getting traction,but it does not feel like that.

What should i check first? Im gona check compression and stuff, and check the plugs for the first time since ive NEVER done that before. Maybe i got it running rich.
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  #2  
Old 12-04-2008
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Check your plugs first.
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  #3  
Old 12-04-2008
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Will do, since ive never done it ive had people tell me how before.. But how long do i need to run it wide open before i shut it off? not very long im hoping to do it in my yard.
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  #4  
Old 12-04-2008
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Check them before you start too.
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  #5  
Old 12-04-2008
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Originally Posted by OCR View Post
Check them before you start too.
Ive already rode it a bit in the yard to check if it just got warm last time and lost power of if it was sometihng else. Ill check in a bit cuz im going out to check..

How much and long should i crack the throttle open?
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  #6  
Old 12-04-2008
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I checked the plugs, the pto side is a nice brown looking color it looks like. And the mag side was wet. So, what does that mean and how do i fix it? Do i need to put a different jet in that side maybe? The next smallest size i have is 290. Stock is 290.. Since the one plug is brown colored and not wet, does that mean im jetted fairly good? It was pretty cold today so maybe i could go down to the 290s when its not so cold.

Any ideas? Im gona look for that pic that shows plug colors unless someone knows where its at and can post or link to it.
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  #7  
Old 12-04-2008
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By the way i just got back from riding it a bit, ive put 40 miles on the odometer now. It ran great the whole time i was gone, im guessing a half hour or so riding, and i THINK 12 miles on the odometer? I cant remember for sure what it was before i started.

I found an awesome drift, was pretty decent sized and was very fun haha.. Im going back to it tomorrow to ride it some more and hopefully a video also. There were people out yesterday sledding, just prolly two or three maybe, not a whole lot of tracks but there was definitly people out im surprised i wasnt the first out there haha..
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  #8  
Old 12-04-2008
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Shit.. Well it fouled the plug again.. I think i need to keep the oil mix more lean like that. Am i safe running a 50:1 mix?
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  #9  
Old 12-05-2008
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to keep fouling that same side something is not perfectly right, since we are pretty cold temps brown is nice color, wet is to fat. the oil in the first tank of gas along with oil injection sometimes fouls plugs.
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  #10  
Old 12-05-2008
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Quote:
Originally Posted by Madcow View Post
to keep fouling that same side something is not perfectly right, since we are pretty cold temps brown is nice color, wet is to fat. the oil in the first tank of gas along with oil injection sometimes fouls plugs.
No oil injection, premix still.

Tonight i threw some br9eya plugs in it, i heard they foul less and are direct replacement for the br9es? I only rode it around the yard but seemed good.

With that one side wet and the other not, what could be the cause of it doing that? Tomorrow i am going to make sure the carbs are in sync also.
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  #11  
Old 12-05-2008
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why are you leaning out the oil? your still getting the same gas flow... you would have to lean the main jets down (depending on if they are too fat) to lean out the mixture. 40:1 is as lean as i would go on a new rebuild.
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  #12  
Old 12-05-2008
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Originally Posted by MX86 View Post
why are you leaning out the oil? your still getting the same gas flow... you would have to lean the main jets down (depending on if they are too fat) to lean out the mixture. 40:1 is as lean as i would go on a new rebuild.
Tho i did rebuild it i guess, there were no new parts such as rings or pistons. I got a used piston and cylinder and used rings, which may not be recomended by most or anyone, the 440 rings are fuckin expensive for this thing and these still give good compression and work good for, I THINK..haha

I was leaning out the oil cuz it was fouling that plug, and i figured it was due to too much oil in it. Which i think it was.. But i suppose i could try some 40:1 with the br9eya and the new oil and see what it does.

Its running 300s and the one plug was brown and looked good, other was just a little wet, could i go down to a 290 on that side or both maybe? Im afraid to even try it and check plugs risking damaging anything.
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  #13  
Old 12-05-2008
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well make sure the carbs are sync'ed first. and that the settings are right. then check that the needles are set the same.
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  #14  
Old 12-06-2008
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Will do and ill report back soon tomorrow with how it goes.
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  #15  
Old 12-06-2008
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tomorrow is today dumbfuck!
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she was all hongry and shit.
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  #16  
Old 12-06-2008
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If you are fouling one side Westy, it's in the carb set up, your float adjustment, choke sticking, plugged pilot (yes MX, I said pilot!!) are all parts of the problem
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  #17  
Old 12-06-2008
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Hmm your right, i should check the floats, i guess ill tear them apart today again even tho im pretty sure i cleaned them good last time which was not long ago. And ive had the carbs switched around on the different sides, and it did the exact same thing to the same plug. But i didnt have the cables swapped sides, dont know if i messed with the sync since then or not. I think im going to try that first. O ya and no choke on this sled
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  #18  
Old 12-06-2008
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I might be opening myself up to ridicule from people that actually know stuff, but why not just jet the rich cyclinder leaner? I did that to my 400 and it runs great. I might be wrecking something, but I don't think so. My RMK's factory jetting ran two different sizes of jets, so I wouldn't think doing this would be a problem.
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  #19  
Old 12-06-2008
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Quote:
Originally Posted by Rubi View Post
I might be opening myself up to ridicule from people that actually know stuff, but why not just jet the rich cyclinder leaner? I did that to my 400 and it runs great. I might be wrecking something, but I don't think so. My RMK's factory jetting ran two different sizes of jets, so I wouldn't think doing this would be a problem.
Well you are right about that, atleast for Polaris. On dootalk someone said their 440 ran hotter on the pto side also. Thats what i was thinking of doing, But im afraid it goes too lean and burns it up. Im not really sure yet, i gotta make sure they are synced and other shit and then if not, im gona put a leaner jet in it i guess and see what happens.
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  #20  
Old 12-06-2008
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if it goes to lean it will burn up not maybe, but, if you are that rich now that its fouling that cylinder just change the jetting on that cylinder. alot of sleds have 1 cylidner run hotter, either becuase air flow under the hood across the engine or water flow through the engine, but either case a lot of sleds jet one cylinder fatter.
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high performance engineering
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  #21  
Old 12-06-2008
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if your fouling plugs david, going down 1 jet size on the cylinder will not lean it out enough to blow the piston
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  #22  
Old 12-06-2008
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Going down a jet is my last resort i guess, but then again if its running a little rich id want to go down a size anyways so it has its full potential of its power.

And i did pull the air box off, the carbs are nowhere near synced. I havent tried syncing them yet but will be soon and see how that works
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  #23  
Old 12-06-2008
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why would going down a jet be you last resort? i mean PLEASE don't tell me that your leaning out the oil... cause all your doing is giving it less lubrication to the same amount of gas!

Sync the carbs, and if that doesn't work go one size down on the fouling cylinder. (i believe you said it was the mag side?
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  #24  
Old 12-06-2008
westman995
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Quote:
Originally Posted by MX86 View Post
why would going down a jet be you last resort? i mean PLEASE don't tell me that your leaning out the oil... cause all your doing is giving it less lubrication to the same amount of gas!

Sync the carbs, and if that doesn't work go one size down on the fouling cylinder. (i believe you said it was the mag side?
I guess mostly cuz last time i checked the plugs one plug was brown and looked like it was good. So i dont want to go down any unless thats what it really needs, Which i wont know til i do the carbs. I did lean out the oil, which i guess wasnt a good idea? Its got more oil than 50:1 im pretty sure. Im going to just add a little oil and run this tank out low, then empty it and start over to know for sure what oil mix im getting. Ill do 40:1 after this.

Yes its the mag side ive been having problems with. When i moved the throttle a little bit the mag side carb slide would move just a little and the other one stayed down, what does that mean? Is that correct for the mag side fouling/getting more gas?
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  #25  
Old 12-06-2008
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well kind of, if the mag side slide is moving first then it would draw in more fuel at lower speeds where the needle/pilot is controlling the fuel flow. but at wide open throttle both slides are wide open, so it wouldn't have much effect on it. but it would load up the mag side cylinder.

do a wide open run for about 3 sec, hit the kill switch and then let off the gas and then see what the plugs look like. if they both come out close to the same color, then you need to sync the carbs..

and i wasn't talking about dropping the jets on BOTH carbs. just the mag side one.
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