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Old 07-11-2013, 09:49 AM   #9076
jspringator
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Location: Versailles, KY
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What happens if you remove too much muffler material?

One of the posts on the XT forum says a lot of riders switch back to the stock pilot jet.
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Old 07-11-2013, 10:33 AM   #9077
J5k
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Location: Greenfield Center, NY
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For what it's worth... 2000 xt:
42.5 pilot
127.5 main
~2.5 turns out on air(pilot?) screw
Fmf power core 4

The bike runs amazingly throughout the entire range as best as I can tell. The amount of heat generated by the engine makes me think I'm either spot on or if anything, a tad lean. Bike starts from cold with the choke and will run off choke in about a minute or less in 70+ degree weather. If I try to ride within a minute of starting it will hesitate when I give it throttle. Otherwise once it's warm it runs great. Rode about 2 hours over the weekend in the woods almost exclusively in 2nd gear and didn't burn anything up. This was after a 15 minute drive on the road at 55 tops.

My point... I've never done the shim and am wondering if it is at all necessary.
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Old 07-11-2013, 10:53 AM   #9078
GlennR
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Location: Boone,NC
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Quote:
Originally Posted by J5k View Post
For what it's worth... 2000 xt:
42.5 pilot
127.5 main
~2.5 turns out on air(pilot?) screw
Fmf power core 4

The bike runs amazingly throughout the entire range as best as I can tell. The amount of heat generated by the engine makes me think I'm either spot on or if anything, a tad lean. Bike starts from cold with the choke and will run off choke in about a minute or less in 70+ degree weather. If I try to ride within a minute of starting it will hesitate when I give it throttle. Otherwise once it's warm it runs great. Rode about 2 hours over the weekend in the woods almost exclusively in 2nd gear and didn't burn anything up. This was after a 15 minute drive on the road at 55 tops.

My point... I've never done the shim and am wondering if it is at all necessary.

"If it's not broke"......

Mine runs great & I ride, ride, ride. Don't mess with a good thing.
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Old 07-11-2013, 11:30 AM   #9079
motolab
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Quote:
Originally Posted by Rumlover View Post
I created and cured the exact high rpm stumble symptom when messing with the pilot circuit on this carb (was at 4,200' + altitude and I think the snorkel was in at the time -- its been awhile).
At what throttle opening?

Regards,

Derek
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Old 07-11-2013, 11:34 AM   #9080
rextec
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Location: Yucca Valley, CA
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Quote:
Originally Posted by J5k View Post
For what it's worth... 2000 xt:
42.5 pilot
127.5 main
~2.5 turns out on air(pilot?) screw
Fmf power core 4
what altitude are you at?

2002 xt225, 3400ft.
average temp range 80-105*

40 pilot
127.5 main
3 turns out on screw
UNI filter
FMF powercore 4
-replaced intake manifold and cracked carburetor side cover.

starts right up with choke, quick warm up, pulls through the whole range very well. I'm also thinking of shimming to make my nice mid range possibly better! I've put well over 100 miles on this setup without any problems. I did ride up to higher elevation and it would do a quick hiccup at full throttle a few times but nothing of concern, probably due to richening of the mixture at high altitude.
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Old 07-11-2013, 12:45 PM   #9081
J5k
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Quote:
Originally Posted by rextec View Post
what altitude are you at?

2002 xt225, 3400ft.
average temp range 80-105*

40 pilot
127.5 main
3 turns out on screw
UNI filter
FMF powercore 4
-replaced intake manifold and cracked carburetor side cover.

starts right up with choke, quick warm up, pulls through the whole range very well. I'm also thinking of shimming to make my nice mid range possibly better! I've put well over 100 miles on this setup without any problems. I did ride up to higher elevation and it would do a quick hiccup at full throttle a few times but nothing of concern, probably due to richening of the mixture at high altitude.
I'm at around 600ft according to Wikipedia. I honestly thought my location was a little higher up but I guess not.
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Old 07-11-2013, 03:19 PM   #9082
rextec
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Location: Yucca Valley, CA
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jetting

Quote:
Originally Posted by J5k View Post
I'm at around 600ft according to Wikipedia. I honestly thought my location was a little higher up but I guess not.
hmm, that's pretty low, have you tried the 130 main? most people run that without any mods to their bike at your elevation. It might be worth a try to shim it as well.
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Old 07-11-2013, 03:24 PM   #9083
J5k
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Quote:
Originally Posted by GlennR View Post
"If it's not broke"......

Mine runs great & I ride, ride, ride. Don't mess with a good thing.
Exactly, I was just trying to point out that perhaps the shim wasn't as good of an idea as some might think, or might cause other issues like Alonzo is experiencing.
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Old 07-11-2013, 04:39 PM   #9084
alonzo
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Location: Northwest Ozarks
Oddometer: 406
carb update

This morning I removed the air filter. Bike ran about perfect (as it did with the filter in and the airbox cover off.) Seems like either just a little more air or still less fuel will have it running well.

The filter didn't seem all that dirty but was almost dripping oil. I cleaned and re-oiled it an put it back in. Haven't ridden it since then.

Current state:
42.5 pilot jet
125 main jet
Needle raised ~0.060"
Z1 mod and no snorkel

-- alonzo
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Old 07-12-2013, 06:05 AM   #9085
J5k
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Quote:
Originally Posted by rextec View Post
hmm, that's pretty low, have you tried the 130 main? most people run that without any mods to their bike at your elevation. It might be worth a try to shim it as well.
Sorry rextec, I didn't see this post yesterday. I probably will try the 130 main soon. Ideally for me, I'd have it run just a bit rich to keep the temperature down. The quiet core for the fmf just showed up yesterday so I'm going to see how it runs with that first.
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Old 07-12-2013, 08:48 AM   #9086
GlennF33
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I run a #130 main, #42.5 pilot, fuel screw 3 turns out, UNI filter, bottom half of snorkel removed, (2) 1" UNI filter plugs in side of airbox, Z1 exhaust mod (1 1/8 hole) no shims under needle. At 1200 ft. and it runs and starts perfectly.
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Old 07-12-2013, 10:33 AM   #9087
lamotovita
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Location: WA/AZ, USA
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Quote:
Originally Posted by J5k View Post
Sorry rextec, I didn't see this post yesterday. I probably will try the 130 main soon. Ideally for me, I'd have it run just a bit rich to keep the temperature down. The quiet core for the fmf just showed up yesterday so I'm going to see how it runs with that first.
Rich jetting is more likely to make your engine run hotter.
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Old 07-12-2013, 03:09 PM   #9088
J5k
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Quote:
Originally Posted by lamotovita View Post
Rich jetting is more likely to make your engine run hotter.
What are you basing that on? I'm no expert or scientist by any stretch but everything I've read and experienced tells me the opposite.
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Old 07-12-2013, 03:10 PM   #9089
alonzo
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Friday's carb update

Yesterday PM I removed the backfire screen and put in the cleaned and re-oiled air filter back in.
Went out for a short run this morning. Still stumbling.

Then I removed the #42.5 pilot and put the stock #40 in. Still stumbling at WOT (and somewhat at 3/4 throttle) and top rpm but, maybe (just maybe) a very small amount better.

Then put the needle circlip back in it's original groove. Still stumbling and maybe a little loss of mid/upper-mid range pull.

I have put the circlip back to the new groove as changing it had no effect on the open throttle stumble.

So, now the carb is back to stock (except for the raised needle.)
The only time the stumble was gone was with the airbox cover removed or with the filter removed.

There's really no place to drill the top of the airbox and I hate to put holes in the side cover, but, I guess I'll try to find some goof plugs to put into the side cover when crossing water because drilling there seems the only somewhat practical way to get more air flow.
Still kind of a pain as I'd have to remove the left side panel to get access.

Current state:
40 pilot jet
125 main jet
Needle raised ~.060"
Z1 mod and no snorkel

Using my SOTP* dyno for testing leaves a lot to be desired.

* Seat-Of-The-Pants.

-- alonzo
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Old 07-12-2013, 04:45 PM   #9090
motolab
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Quote:
Originally Posted by alonzo View Post
The only time the stumble was gone was with the airbox cover removed or with the filter removed.
Does the carburetor have a main air bleed passage or jet?

Regards,

Derek
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