04 zr900 0>1/4 throttle, rich?? - HCS Snowmobile Forums

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Old 02-05-2012, 08:20 PM   #1 (permalink)
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Default 04 zr900 0>1/4 throttle, rich??

symptoms.... will 'burble' when just starting acceleration in trail conditions, same as if choke is on. Engine will scream past the burble, just annoying in trails. Carbs are syn'd, chokes are seated> 1/8" play in lever, air screws at 2 turns, fuel screws not known- but fairly new machine, less than 2k miles, doubt if anyone has tinkered with this/ hard to get at without pulling carbs, stock jetting & needles. Boots are tight! Same with new plugs...
Looking for suggestions as to where to begin adjustments...
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Old 02-05-2012, 10:49 PM   #2 (permalink)
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air screws at 1.5, you can get at them just fine without removing anything if you use a 18" screwdriver and a flashlight. then take and drop the needles one clip position. stock was 4, so move the clip up to #3 from the top. if that fixes your blurble, enjoy it, but respect it, in knowing that you just leaned your midrange down just a tad so you'll want to watch cruising at a steady low/midrange throttle position for too long.
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Old 02-05-2012, 11:14 PM   #3 (permalink)
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Thanks... air screws were my 1st thought, but am trying to be smart and ask the question 1st... LOL! Hadn't thought of lowering of the needles... little bit hesitant on changing mid-range.... as it stands right now the engine has great pull just above 3/16>1/4 throttle, just the incessant on/off trail cornering. I've tried 'metering' the throttle through the corners... just a bit better, but the 'burble' takes the 'smoothness' from it! It feels similar to a built 4stroke, before coming on the cam... then whump... acceleration!
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Old 02-05-2012, 11:34 PM   #4 (permalink)
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...drop the needles. easy enough to try it.
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Old 02-06-2012, 09:20 AM   #5 (permalink)
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true... is easy enough.... will try later this week when I get back to the cottage... thanks
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Old 02-06-2012, 10:03 AM   #6 (permalink)
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Throttle bushings, throttle cable adjustment ok?
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Old 02-06-2012, 06:39 PM   #7 (permalink)
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Quote:
Originally Posted by snochopper View Post
Throttle bushings, throttle cable adjustment ok?
as in TSS ? all ok, cable adjustment good. I should have stated that in my 1st post...
good thought, thanks....
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Old 02-06-2012, 06:46 PM   #8 (permalink)
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Its prob fuel/air screws, I wouldn't run leaner than 4th on the needle.
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Old 02-06-2012, 09:03 PM   #9 (permalink)
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Ahhh. C'mon. I use to run in 3 with 400s and a 2.5 key, but that was on the actual Fuel of 'o4 and not what we have now. I didn't let my wife cruise with it hot and crisp like that though. Staying on the rich side I suppose is $afer but with being all stock otherwise I do think that dropping the needles would be fine. I'd try it, and then have a look anyway
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Old 02-06-2012, 09:29 PM   #10 (permalink)
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When you could count on fuel it was good, I ran mine 3 1/2 (shimmed) and it was perfect but after working on a few, even with decent 91 it got too scary for my taste, if you cant screw it out, grab some shims and try a 3 1/2 setting. I guess Im just getting to be a chicken when it comes to the crap they give us and call it fuel.
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