2001 Sx700..Off idle bogging..help!!

T

tlspeed1

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Jan 9, 2008
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Hey guys, I have a 2001 Sx700. I recently went through and cleaned the carbs and followed suggestions in the tuning area of tech section and I rejetted to 142.5 ,mains, notched my reeds, and did the clutching suggested too. I cleaned all my jets and checked my float levels, I did not raise my needles.

Now my problem is that I have an off idle bog, which i can get to clear out if I feather the the throttle. The sled goes quite well otherwise but if I pin it from an idle it will fall on its face and almost die if I dont let off.

Now Im assuming that i need to adjust the fuel screw, I set mine to the factory 1.5 turns out. Is there something I am missing here? Any help appreciated. Thanks in advance
 
it could either be a lean bog or loose belt deflection. what clip is your needle on and are you sure the pilot jets are cleaned out all the way? also, you could possibly have a bog, due to incorrectly set belt deflection. you said you just did some clutching, maybe you need to check/adjust the belt for proper belt deflection?
 
Feels like a lean bog. For instance if I crack the throttle from a standing still idle, and dont let off the throttle the motor will die.

The clips on the needle are in the factory location.

As far as clutching all i did was switch to 14.5mm rollers and changed out the rivets.

I will check my belt deflection and see what it is.
 
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after you give your sled some throttle and you let off, the rpms will hang at like 3000 or something for maybe 5 seconds and then drop down to the correct 1800 rpm idle. does your sled do something like this?
 
I have that problem with my 01 SXR600.Hanging around 2500 and slowly drops.I had to adjust my idle screw down,then when I go to start on a new day...the engine isn't idling fast enough during warmup.I have to give it throttle until it warms up a bit.Didn't do this last year.I think the pilots may be plugged slightly..my guess.Will need to remove carbs then and clean.
 
daman said:
bump out your screws another 1/4 turn..do you have a idle hang??????
Click to expand...

I do have a bit of an idle hang, but only once and a while, and it usually takes longer than 5 seconds to go down. Whats goin on here

I went and recleaned my carbs, paying close attention to the pilots, they were clean.

I had to turn my screws out 3 turn to get it to run right. Now it feels like it is loading up a little bit if i let it sit an idle. If i am riding a dont notice the load up.

Why am I out 3 turns when factory recommends 1.5. What else is wrong
 
tlspeed1 said:
I do have a bit of an idle hang, but only once and a while, and it usually takes longer than 5 seconds to go down. Whats goin on here

I went and recleaned my carbs, paying close attention to the pilots, they were clean.

I had to turn my screws out 3 turn to get it to run right. Now it feels like it is loading up a little bit if i let it sit an idle. If i am riding a dont notice the load up.

Why am I out 3 turns when factory recommends 1.5. What else is wrong
Click to expand...
3 turns wow way too far out,are you all stock?? what size pilots??
 
I thought 3 turns out was a alot too..

I followed the tunning page and re-jetted to 142.5 all the way across. Did the reed notch, the silencer mod. I also changed the rivets to what are recommended on the clutching page.

I believe the pilots are stock. I dont remember the number off the top of my head. My dad bought this sled with 1200 miles on and it was stock then, and my father never deviated from stock in the 4 years he owned it.

Like i said before it was loading up a touch on idle, so I am gonna turn them back in 1/4 or 1/2 and see how it performs.

Any other ideas on what I am doing wrong. Thanks
 
well if your carbs are clean float set to spec all else good and you got 45 P/J in try 1.5 on the screws.should work..
 
I have a 2000 sx 700 and my off idle bog turned out to be the pto side crank seal. Currently in the process of a rebuilding of the motor as it has 17,000 km (10,000 miles) on it. Sled ran perfectly fine last winter but this year it had the off idle bog. I cleaned the carbs multiple time and changed my reeds to no avail. I found the leak by spraying WD40 on the PTO side of the motor (careful not to get any on the clutch) and the idle speed increased. I would try this next. You may be able to do the same on the mag side.
 
Can't believe what happens to sleds every year.Takes me 1 whole season to figure out I have clutch issues and rebuild the clutches in the summer.Now it is going to take me all season to figure out the lean idle thing.Is this lean idle a mistake that Yamaha never addressed.Why then are so manyguys having the same thing going on.Is this one weakness in the triple motors or what?This should not be happening at all.
 
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