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Old 09-11-2008, 11:54 AM   #136
Capsicum
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ever read how people say shit about the air scoops? Like, "I took off those stupid fake radiator covers" or "Whats with the air scoops that do nothing?" Well not everyone with a keyboard can be reel smrt.
No, they arn't functioning ramjet intakes or hiding a radiator, but they do look like they do a pretty damn good job of funnelling cool air over the head you morons, it don't take no 20/20 ta see dat.
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Old 09-11-2008, 12:39 PM   #137
jegrmajstr
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Quote:
Originally Posted by Capsicum
ever read how people say shit about the air scoops? Like, "I took off those stupid fake radiator covers" or "Whats with the air scoops that do nothing?" Well not everyone with a keyboard can be reel smrt.
No, they arn't functioning ramjet intakes or hiding a radiator, but they do look like they do a pretty damn good job of funnelling cool air over the head you morons, it don't take no 20/20 ta see dat.
Don't mind the morons, those of us who have a bit of knowledge about bikes know why are there even the most 'stupid and uncool' things :)
I think the bike would overheat a lot more if there were no scoops, so they're staying even if they're 'fake'
Had anyone tried to install a small, high-performance fan inside the scoops? It would surely help the engine keeping a cool head in traffic. I'm considering of mounting one myself, and so far I found two options: taking a pair of an existing 12V computer fans and modify them to fit inside the scoops (one on each side), or taking two small high-rpm electric motors and connecting them each to a separate fan + making a custom cowling to fit inside the scoops. Everything would then be wired to the battery via a switch to turn them on and off when necessary. I think I'll be tinkering with this during the winter, if I end up with something that works I will post it here with DIY instructions :)
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Old 09-11-2008, 12:42 PM   #138
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Quote:
Originally Posted by Capsicum
ever read how people say shit about the air scoops? Like, "I took off those stupid fake radiator covers" or "Whats with the air scoops that do nothing?" Well not everyone with a keyboard can be reel smrt.
No, they arn't functioning ramjet intakes or hiding a radiator, but they do look like they do a pretty damn good job of funnelling cool air over the head you morons, it don't take no 20/20 ta see dat.
+1

I even relocated my horn to get better airflow through the right one.
Mine have taken quite a beating and the left is held on by zip ties, but if you stick you're hand down there, you can feel the extra air movement.

That being said, I recently removed mine as an experiment to see if I would get better milage. It's getting colder now so I'm not woried about heat.
First morning without it was around 50 deg F out and It felt like someone put icepacks on my knees. My conclusion is...
Yes, The bike will be more aerodynamic, but only as long as there isn't anyone on it. I'm putting them back on.
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Old 09-12-2008, 01:05 AM   #139
Capsicum
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Quote:
Originally Posted by jegrmajstr
Don't mind the morons, those of us who have a bit of knowledge about bikes know why are there even the most 'stupid and uncool' things :)
These were people who reveiw bikes and or regularly work on them. Things I've read on the web. It's all true and in high regard you know.


Anyhow carb tinkering is higher on the list for my bike at the moment, right behind replacing the rear tire and changing the sprocket size. (But still below some pressing obligations, stupid stupid non-wheeled things.)
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Old 09-12-2008, 08:09 AM   #140
meangreenmachine
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Wink I miss my old red and white xt350!

I miss my bike, I think it was an 89, I rode it on and offroad all through the rocky mountain divide of canada, switch backs up thousands of feet to glaciers and down steep shale slopes. hitting wash out gearing down into second, and launching out the other side, I would land on my rear tire, power wheeely land and then gear back up until then next washout!
absolutly, an awsome bike! it was a bit underpowered for the highway but i loved in on the trails!
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Old 09-12-2008, 02:24 PM   #141
Grreatdog
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I rode mine for many, many years in seriously hot SC weather without the scoops. I know they put air on top of the engine. But they just didn't work well on the larger Clarke tank. They fit but it made for a wider bike than I like.

And it didn't make any difference with mine. If not using them shortened the life of the engine, then 17 years was long enough for me anyway. I doubt the scoops caused the dropped valve that finally grenaded the engine. I attribute that to nonstop abuse and a bad auto decomp.

So I say keep 'em or lose 'em. It won't make any difference to the bike
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Old 09-12-2008, 06:43 PM   #142
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So I'm thinking of selling off the Xt I just got. I've also got a '73 Honda CB350 so I need to decide which one to keep. Being new to bikes, I'm not sure how much to ask for the Xt if I sell. Its in good shape overall. There is a dent in the tank and some scratches to the plastic here and there but nothing too bad or even very noticeable. The mirrors are broke, as well as the left front signal lens. Tires will need replaced soon and spokes tightened (way loose). It also needs a new battery. Just shy of 9000 miles and starts on the second or third kick when cold and runs great. I posted pics a few pages back when I got it. So what should I ask for it should I decide to let it go?
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Old 09-13-2008, 12:18 AM   #143
busta3396
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I have been trying to find a 20 tooth countershaft sprocket for the xt
350 but no luck, anyway I wanted to know if anyone has been using a
47t rear sprocket on the xt with the stock 428 chain? I am considering
this sprocket to get a higher top speed and lower rpms, but I am just
not sure about the acceleration, will there be enough power to climb
up dirt roads, nothing really aggressive, I really just want to use
this bike for commuting and the occasional fire road adventure. My
main fear is having the engine stall on first gear, that would be a
pain going up hill than having to start her up with the kickstarter.
thanks

-Brian
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Old 09-13-2008, 06:12 AM   #144
jegrmajstr
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20T countershaft sprocket shouldn't be a problem considering power and torque, especially if the bike is uncorked. The bigger problem is, like you said, finding the sprocket. I went through quite a few manufatorers and none of the sell the 20T, they have smaller at best. If all else fails I'll take the stock sprocket to a guy who has a machine shop and makes sprockets for industrial machinery. Most likely he would be able to help me.
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Old 09-15-2008, 08:24 AM   #145
spokexx
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xt350 led turn signals

Hey all, im now an XT350 owner and i just put 4 led turn signals on it. I also put a special flasher relay to make it flash. Now heres the problem im encountering, as well as other people with other bikes on line. All 4 turn signals are flashing at the same time when i hit the switch. Hmmm... a few posts elsewhere say either to remove the indicator bulb on the dash, or install a diode. Well, id like to go the diode path considering im one to many times forget my turn signal is on. So what kind of diode do i purchase, where do i install it, and how many do i need? Also, which direction do i install it? I know how diodes work, they are basically a oneway door for electricity.

thanks
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Old 09-16-2008, 05:54 AM   #146
spokexx
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nevermind, i pulled the indicator lite and all is fine. I got lazy and didnt feel like going through the trouble of dioding. Has anyone had any experience with using a Fox air shock on their xt350? Maybe one could be retrofitted from a snowmobile or quad model? I sure love my air shock on my mtb. Add air and raise the height. Lower the air and lower the bike. Plus it's way lighter than coil overs.

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Old 09-17-2008, 02:21 PM   #147
jegrmajstr
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Slight update:
Today I rejetted the bike (130 primary, 120 secondary), adjusted the pilot screw and drilled 3 10mm holes in the airbox cover. The bike has a bit more power now in low and mid rpm, but it's still running too rich above 6500rpm (engine coughs and splutters over those rpm and when you go full throttle and then suddenly shut it), so tomorrow I'll increase the holes to 15mm, that I think should do it.
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Old 09-17-2008, 02:39 PM   #148
nails1
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Quote:
Originally Posted by jegrmajstr
Slight update:
Today I rejetted the bike (130 primary, 120 secondary), adjusted the pilot screw and drilled 3 10mm holes in the airbox cover. The bike has a bit more power now in low and mid rpm, but it's still running too rich above 6500rpm (engine coughs and splutters over those rpm and when you go full throttle and then suddenly shut it), so tomorrow I'll increase the holes to 15mm, that I think should do it.
Where did you find jets for the secondary carb? I had to fab mine. But I found the other jets in webistan.

I haven't drilled holes like you mention, but it's really hard for me to believe that this would do much.

I'm a big fan of golden-wheat colored plugs. I'd recommend focusing on the high-speed open-throttle end of things first, and then working down to 3/4 throttle, then about 1/3 throttle (when the secondary should be out of the picture), and fussing with idle jets last. I hesitate to change more than one thing at a time, because everything can change about anything else. I iterate through this exercise until I get a nice plug all the time. And I'm scared to mess with carb synchronization unless I clearly have to.

For my part, I'm stuck on step 1 because (I think) I have a bad condensor. A bad condensor also causes such sputtering at high RPMs, especially under load, and often worse when rich than when lean. I don't know how to test except part-swapping (should show up later this week).

Oops -- this bike has CDI and no condensor.

If you have a spark problem, then trying to dial-in the jets is an exercise in futility.

But that's just my opinions.

--
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nails1 screwed with this post 09-22-2008 at 07:48 AM
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Old 09-17-2008, 03:03 PM   #149
jegrmajstr
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Quote:
Originally Posted by nails1
Where did you find jets for the secondary carb? I had to fab mine. But I found the other jets in webistan.

I haven't drilled holes like you mention, but it's really hard for me to believe that this would do much.

I'm a big fan of golden-wheat colored plugs. I'd recommend focusing on the high-speed open-throttle end of things first, and then working down to 3/4 throttle, then about 1/3 throttle (when the secondary should be out of the picture), and fussing with idle jets last. I hesitate to change more than one thing at a time, because everything can change about anything else. I iterate through this exercise until I get a nice plug all the time. And I'm scared to mess with carb synchronization unless I clearly have to.

For my part, I'm stuck on step 1 because (I think) I have a bad condensor. A bad condensor also causes such sputtering at high RPMs, especially under load, and often worse when rich than when lean. I don't know how to test except part-swapping (should show up later this week).

If you have a spark problem, then trying to dial-in the jets is an exercise in futility.

But that's just my opinions.

--
Neal
I simply ordered the jets from a Yamaha dealer :) I don't think that the problem is with the spark because the bike ran great before rejetting (no problems at high rpm, up to 9000) and the spark is new. If you increasethe fuel part of the mixture, you also have to increase the air - so the holes in the airbox, but there is still not enough air so far. I'm 99% sure I'm going the right way because the bike ran worse without the additional air flow and now it runs better, but still not perfect. I hope I'll have it sorted tomorrow or at least until the end of the week, when I'll be putting an aditional switch on with my friend to turn on all four indicators at once (a bit more safety when stopping on the side of the road at night).


PS: here are the jet sizes and part numbers that fit the XT 350 carb - found and copied from TT:

PRIMARY MAIN JETS
288-14343-35-00 = 70
288-14343-39-00 = 78
288-14343-40-00 = 80
288-14343-41-00 = 82
288-14343-42-00 = 84
288-14343-43-00 = 86
288-14343-44-00 = 88
288-14343-45-00 = 90
288-14343-46-00 = 92
288-14343-47-00 = 94
288-14343-48-00 = 96
288-14343-49-00 = 98
288-14343-50-00 = 100
288-14343-51-00 = 102
288-14343-52-00 = 104
288-14343-53-00 = 106
288-14343-54-00 = 108
288-14343-55-00 = 110
288-14343-56-00 = 112
288-14343-57-00 = 114
288-14343-58-00 = 116
288-14343-59-00 = 118
288-14343-60-00 = 120 (XT 600 OPTION)
288-14355-61-00 = 122
288-14355-62-00 = 124 [AKA 288-14343-62-00]
288-14343-63-00 = 125 (XT 350 STOCK)
288-14355-64-00 = 128 [AKA 288-14343-64-00] (TW200 01-07 OPTION)
288-14343-65-00 = 130 (XT 600 STOCK)
288-14355-66-00 = 132.5 [AKA 288-14343-66-00]
288-14355-67-00 = 134 [AKA 288-14343-67-00]
288-14343-68-00 = 135
288-14343-70-00 = 140 (XT 600 OPTION)
288-14343-73-00 = 146
288-14329-74-00 = 148 [AKA 288-14343-74-00]
288-14329-75-00 = 150 [AKA 288-14343-75-00]
288-14343-76-00 = 152
288-14329-78-00 = 156 [AKA 288-14343-78-00]
288-14343-80-00 = 160
288-14329-81-00 = 162
288-14329-82-00 = 164
288-14329-83-00 = 166
288-14329-84-00 = 168
288-14329-86-00 = 172
288-14329-87-00 = 174
288-14329-88-00 = 176

SECONDARY MAIN JETS
30X-14343-40-00 = 80
30X-14343-50-00 = 100
30X-14343-51-00 = 102
30X-14343-52-00 = 104 (XT 600 STOCK SEC MAIN)
30X-14343-53-00 = 106 (XT 350 STOCK SEC MAIN)
30X-14343-55-00 = 110 not sure if available
30X-14343-60-00 = 120
30X-14343-63-00 = 125

PILOT JETS
30X-14342-19-00 = 38
30X-14342-20-00 = 40
30X-14342-21-00 = 42 (XT 350 STOCK)

#48 pilot 43f-14342-24.
#140 main 288-14343-70
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Old 09-17-2008, 04:02 PM   #150
nails1
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I think you have a good dealer. The one here was altogether baffled -- couldn't even find the right fiche. But I've also had no luck with several on-line parts dealers.

I was hoping that you had found a source for the whole series of jets for this secondary. It's interesting that they jump from stock 106 right up to 120. These bikes come wicked lean, and I take this as evidence that Yamaha knew all along that 120 was the right jet in the first place. I think you need 120 to get the right mix, and with more air you may need a bigger jet yet.

I understand that the biggest bottleneck in the intake is that weird filter element, not the snorkel or box. I hear that the TT is set up much better.

Yeah, unlike you, my bike never has run right since I bought it. It definitely was way-way lean (even here in the mountains), but now I think it's getting close enough that I can't blame my miss on jetting.

I never did get a nice tan plug. 110 was white-lean, and 114 was black-rich; but 112 only showed a kinda dirty gray. Had the high-speed miss with all of them, but really bad with 114. And really-really bad under a big load/hill.

I reckon we'll just have to see if I'm right about the condensor. Otherwise, I'll be disappointed. (Runs swell up to about 55MPH, but I gotta do some freeway if I want to ride to work.)

Had my head in a dark place about the condensor. This bike has CDI.

--
Neal

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