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Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #100657 08/08/12 09:01 PM
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alexd Offline
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Originally Posted By: Wanabecruisen
Mission accomplished. Running much better now. Also added an in-line filter. Still some spit/sputter in the higher gears and can only get it up to about 50mph but it seems to be getting a little bit better each time I ride it. Any tips what to look for next?


Post again, as a reminder. What has been done to your bike in the way of Mods, or is everything stock (or not known if someone previously had it)? That will help in figuring out the next steps.

(you now have the pilot jet adjustment screw out at 3 turns?)

Alexd


(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
Re: Air/Fuel mix screw pic? [Re: alexd] #100661 08/08/12 09:56 PM
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Wanabecruisen Offline OP
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Sure. I picked up the bike non-running from the orig owner. First problem was a stuck neenle valve allowing no fuel into the float bowl. Fixed that and could get it to run only fully choked and even then not very well. Drained the old fuel and put a can if seafoam in the tank. Ran it till the seafoam got fully into the system and would not allow the bike to run any longer. Let it soak for 24 hours and drained the seafoam and replaced with new non-ethanol gas. Little to no improvement at this point. Pulled the carb and drilled the tamper plug out. Adjusted the pilot mix screw to three turns out. Also removed the pilot jet and ran a tip cleaner through it and gave it all another good spray with carb cleaner. Reassembled and started the bike. Now running much better, I took it for a short ride. Returned home to find the bike had warmed up nicely but the warm idle was now way too high. Exhaust pipe was glowing red hot when I got home. I lowered the idle and it now starts andidles well but still has a miss and poor power in higher gears. Also, the intake tube(or whatever it's called) between the carb and the jug looks badly cracked and probably needs to be replaced. Is this common?


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Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #100662 08/08/12 10:10 PM
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alexd Offline
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Do you recall if you're running the stock main jet (and, is it clean)? (#125)

Did you check your float-heights to see if they were within specs, at any time?

Stock muffler or Z1 mod?

"Snorkel" is in place or removed?

Air-filter in place and clean?

We don't know yet if you're running rich or lean...but should know soon.

Cracks that are all the way through, on the carb-engine duct will cause the bike to run lean. Usually, they don't penetrate all the way though; you can test this by spraying something like WD-40 on the duct while the bike is running, and both listen for RPM changes and look for bubbling. Check all ring-clamps for leaks there too...

Alexd

Last edited by alexd; 08/08/12 10:12 PM.

(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
Re: Air/Fuel mix screw pic? [Re: alexd] #100665 08/08/12 10:30 PM
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Wanabecruisen Offline OP
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Believe the jet is stock as are the intake snorkel and exhaust. Air filter is in place and clean. I did not check the float level- function only. Bike only has a little over 2000 miles on it and does not appear to have been messed with much.

I'll check the carb-engine duct(thanks) with some sort of spray as suggested. Clamps are tight.

Thanks again for all the help!


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Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #100667 08/08/12 10:54 PM
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alexd Offline
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After you make the test with the carb to engine duct...and if there is no effect to the spraying...we can try another simple test with the air-filter cover (I'll explain later).

I'm assuming that the fully warmed-up idle is working reasonably well...steady RPM at a reasonable speed with your hand off the closed throttle. And, that the bike starts cold now with full choke, and choke MUST be pushed in as it warms within a few minutes...

Alexd


(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
Re: Air/Fuel mix screw pic? [Re: alexd] #100668 08/08/12 11:39 PM
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Wanabecruisen Offline OP
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Warm rpm is great now. Cold start is easy now with full choke but it takes a looooong time to warm up enough to start to open the choke which I understand may be fairly normal for the XT.

Last edited by Wanabecruisen; 08/08/12 11:41 PM.

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Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #100672 08/09/12 12:14 AM
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alexd Offline
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If your test with the spray doesn't show any cracks that are all the way through, and no leaks at the hose clamps.

Then next, we want to check for overly rich:

Thoroughly warm up the bike. Re-test it; apparently it is showing that it will not do full revs in 4th or 5th gear.

Now, pull off the side cover and remove the 3 screws holding the air-box cover on (don't remove the air-cleaner)...after removing the air-box cover, put the side cover back on, and immediately while the engine is hot, do the same test again: Full throttle in 4th or 5th.
Does it rev higher with less stumbling, or act the same way or worse?

If the first result, we've proven it's too rich. If the second, it's not...and/or running lean.

Do all this with 100% throttle...you can also get up to 30 MPH in 6th, and open it fully up for 10 or so seconds from that point, as a similar test.

By the way, you do have a new spark-plug in it...right?

Alexd

Last edited by alexd; 08/09/12 12:16 AM.

(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
Re: Air/Fuel mix screw pic? [Re: alexd] #100676 08/09/12 01:47 AM
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Wanabecruisen Offline OP
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Plug is a month old according to PO but I'll put a new one in tomorrow just to scratch that one off the list.


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Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #100716 08/10/12 12:20 AM
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Wanabecruisen Offline OP
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No RPM change with carb cleaner spray on the carb-engine duct so that much is good news. Did the air filter test with no real change in performance. Ran it first with the filter on and did the 30mph in 6th with a 10 second full throttle test. The bike only got to about 44mph on the first test with the filter. Repeated the test again with the filter removed and got to maybe 45 on the same stretch of road. Just for grins I did the test again with the filter replaced and got to 46 this time. Oh, all of this with a new plug as well.

The bike seems to be getting slightly better with each run. I'm kinda big for this thing at 6' and 295lbs but I thought it would do more than this. I'm guessing a valve check is next?


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Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #100717 08/10/12 12:39 AM
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alexd Offline
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Wait...I said air-box COVER removed, not filter removed (leaving the air-filter in place). Was there a misunderstanding?

The air-box cover is held in place by 3 screws.

Alexd

Last edited by alexd; 08/10/12 12:40 AM.

(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
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