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Discussion Starter #1
I'm planning a trip to Colorado in September and will be in the 10,000 to 12,000 ft elevation range. I've already installed a 65 tooth rear sprocket to keep the rpm's low and still be in crawl mode. Can someone out there who has made this jet change recommend a main jet that will keep my engine running properly?
 

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The stock jet for 2000 and earlier is 114. Assuming you have the stock jet in there, you would want to go down to a 110. This is two sizes down, but it means you can't go below 7-8,000 until you change back. If you use a 112, you can go down to around 6,000, but will be rather rich at 12,000.

The percentage change in the newer main jets is the same as the old jets even though the numbers are different. I use a 126 (stock) jet in my 2018 and it's good to 6,000, usable to 10,000. When I go to Colorado I put a 122 in, which is the same two sizes down. It is good at 9,000 and usable to 13,000. The same caution about not riding below 8,000 applies to me. Now if you are riding downhill all the way to 6,000 and not using the bike again until putting the stock jet back in you will not hurt it, but trying to climb steep hills at around 6,000 may easily fry your piston.

The last time I went to Colorado I used a 122 when I could have used a 118, which I could not find. At the top of Engineer Pass at 12,800 I could not use anything beyond first when climbing the last few hundred feet, but it was so rough I didn't care that I couldn't go faster. :eek:

The TW has about an 8,000 foot range for any given jet size, but optimum power will only be available for about 3,000 up or down from the perfect altitude for that jet. Terrain is also really important. Real steep hills at 13,000 feet will need the right jet. The previous trip I used a 122 and a 13/55 sprocket, almost identical to your 14/65 with a 110 jet, and I almost couldn't make it up to a mine with a real steep section at 13,500 feet.

If I were you and I could find both the 110 and a 108, I would take both and try the 110 first. Put Allen screws in place of the JIS screws and changing jets will be much easier without taking the tank off. Recognize that at 13,000 feet the TW is only putting out about 6 horsepower no matter how perfectly it is jetted, so there may be some real steep rough spots you just can't make it up.

Have fun!
 

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If you use a 112, you can go down to around 6,000, but will be rather rich at 12,000

If I were you and I could find both the 110 and a 108, I would take both and try the 110 first. Put Allen screws in place of the JIS screws and changing jets will be much easier without taking the tank off.
I live at sea level and use #112 everyday on two TW's and they run very well. I tried a #110 in one of my TW's and the power dropped off a little but it still worked. I put the #112 back in.

If it were me, starting at 5,000 feet I would start with the #110 and if I were going to be above 9000 feet for any length of time I would go with the #108 and have a # 105 at the ready. But if this is just a one day trip up and down I would suffer the entire trip with a #112.

I concur about the allen screws in the float bowl.
 

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If I were you and I could find both the 110 and a 108, I would take both and try the 110 first. Put Allen screws in place of the JIS screws and changing jets will be much easier without taking the tank off.
Rocky hit it on the head. I run the 110 main jet at 9,000ft and up. My spark plug has a nice dark tan/light brown coloration, so I have yet to experiment with the 108 main jet. Be sure that your idle mixture screw is accessible - and plan on using it!
 
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Discussion Starter #5
Thanks for all the great info, it’s much appreciated. Ain’t nothing like getting advice from someone who has already paved the way. I hope my dealer has the 108, 110, &112 jets. If any of you guys know where I could find them on the web, please send a link. Thanks a million
 

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If any of you guys know where I could find them on the web, please send a link.
I would highly recommend Rocky Mountain ATV - my order turnaround time with them has been fantastic!
Below are the listed part numbers for OEM early carb main jets-

288-14343-57-00 - OEM 114
288-14343-56-00 - OEM 112
288-14343-55-00 -OEM 110
288-14343-54-00 -OEM 108
 
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Discussion Starter #7
I would highly recommend Rocky Mountain ATV - my order turnaround time with them has been fantastic!
Below are the listed part numbers for OEM early carb main jets-

288-14343-57-00 - OEM 114
288-14343-56-00 - OEM 112
288-14343-55-00 -OEM 110
288-14343-54-00 -OEM 108
I’ve tried everywhere in the US to find a 110
Jet and no luck. If anyone knows where I can get one please chime in

Jets R us may have something that will work
But will have to take out main jet and mike the length, thread length and thread diameter. Anyone got those dimensions wrote down somewhere?
 

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I’ve tried everywhere in the US to find a 110.
I've located two dealers who may have a 110 through my local dealer:
Action Motosports ,Oklahoma 918-838-8001
Hi Tech Motors, Billings, MT 406-652-0090

Good Luck!
 

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Discussion Starter #10
I've located two dealers who may have a 110 through my local dealer:
Action Motosports ,Oklahoma 918-838-8001
Hi Tech Motors, Billings, MT 406-652-0090

Good Luck!
Rocky, thank
You soooooo much!!! I’ll check it out first thing tomorrow.
 

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papafoon,
You never said what year model your bike was. All of the 108-114 recommendations above are for a bike\carb from 1988 through 2000. If that's you then follow the advice above.

If your bike is 2001 or newer it's a different carb that uses different jets as RockyTFS said in the first response.

Here's an excerpt from TW carb jet part#s with descriptions of when to use different jets..
288-14343-60-00 = 120
288-14355-61-00 = 122
288-14355-62-00 = 124 [AKA 288-14343-62-00]
288-14343-63-00 = 125 (TW 01-13 STOCK SOME)(LEAN, GOOD FOR HIGH ALT. >6000’)
288-14355-63-00 = 126 (TW 01-13 STOCK SOME)(LEAN, GOOD FOR ALT. 4000-6000’)
288-14355-64-00 = 128 (TW 01-13 OPT, CA MODEL STOCK)(GOOD FOR FUEL ECON)(ALT. <5000’)
288-14343-65-00 = 130 (TW MOST POPULAR OPT.)(NEUT-RICH, ALT. <4000’)(XT 600 STOCK)
288-14355-66-00 = 132.5 (RICH, GOOD FOR VERY HIGH TEMPS, LOW ALT)(STOCK IN AUS & S. AFRICA)

I have a 2002 and run a 128 in Austin, TX around 600 feet. Three weeks ago I did a trip in the Rio Grande NF south of South Fork CO and east of Wolf Creek ski area.
This trip I used a 125 and it ran much better. It ran out of power near the top of Greyback Mountain at 12.6K but that's to be expected. I didn't trust going lower than that but RockTFS said he ran a 122 at >9K so I'll probably buy one of those to try next time I get that high.

Here's my routes
and my buddy's video.

Extra Tip#1. My carb boots are very hard and it feels like I'm going to break them when I remove the carb so I just loosen the clamps and remove the throttle cable and fuel lines so I can rotate the carb and replace the jet without actually removing it from the bike.

Extra Tip#2. I bought a thumbscrew fuel mixture screw on Amazon so I can hand adjust it on the trail. It says it's for a Harley but it worked just fine. The one I bought isn't available but there are plenty that look similar.


Have Fun!!
...John
 

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Discussion Starter #13
papafoon,
You never said what year model your bike was. All of the 108-114 recommendations above are for a bike\carb from 1988 through 2000. If that's you then follow the advice above.

If your bike is 2001 or newer it's a different carb that uses different jets as RockyTFS said in the first response.

Here's an excerpt from TW carb jet part#s with descriptions of when to use different jets..
288-14343-60-00 = 120
288-14355-61-00 = 122
288-14355-62-00 = 124 [AKA 288-14343-62-00]
288-14343-63-00 = 125 (TW 01-13 STOCK SOME)(LEAN, GOOD FOR HIGH ALT. >6000’)
288-14355-63-00 = 126 (TW 01-13 STOCK SOME)(LEAN, GOOD FOR ALT. 4000-6000’)
288-14355-64-00 = 128 (TW 01-13 OPT, CA MODEL STOCK)(GOOD FOR FUEL ECON)(ALT. <5000’)
288-14343-65-00 = 130 (TW MOST POPULAR OPT.)(NEUT-RICH, ALT. <4000’)(XT 600 STOCK)
288-14355-66-00 = 132.5 (RICH, GOOD FOR VERY HIGH TEMPS, LOW ALT)(STOCK IN AUS & S. AFRICA)

I have a 2002 and run a 128 in Austin, TX around 600 feet. Three weeks ago I did a trip in the Rio Grande NF south of South Fork CO and east of Wolf Creek ski area.
This trip I used a 125 and it ran much better. It ran out of power near the top of Greyback Mountain at 12.6K but that's to be expected. I didn't trust going lower than that but RockTFS said he ran a 122 at >9K so I'll probably buy one of those to try next time I get that high.

Here's my routes
and my buddy's video.

Extra Tip#1. My carb boots are very hard and it feels like I'm going to break them when I remove the carb so I just loosen the clamps and remove the throttle cable and fuel lines so I can rotate the carb and replace the jet without actually removing it from the bike.

Extra Tip#2. I bought a thumbscrew fuel mixture screw on Amazon so I can hand adjust it on the trail. It says it's for a Harley but it worked just fine. The one I bought isn't available but there are plenty that look similar.
[/URL]


Have Fun!!
...John
Thanks for the info John. The thread heading says “ High altitude jets for 1989 TW200
Well their website says they do, I actually ordered 3 different jets that they said were in stock. Got an email 2 days later saying they were back ordered and wouldn’t ship until sometime in September if then.
 

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Put a Dynojet kit in it and DONE. All ya gotta mess with is main jets in the future. And even doing that is being very picky. I'm at sea level, With the Dynojet kit installed, I run one that comes with the kit for 3000' to 6000' elevation. Ran the same jet last week at elevations from 3000' to 10,200. Ran great, but with a lil stumble when climbing on asphalt roads WOT. Previously, I messed with jetting, changed everything I could many times, & still was frustrated with warm up time, & a low rpm stumble. After I installed the kit, warm up is almost non existent, & the bike runs great almost everywhere. 2020 TW. Best thing I've done to the TW.
 
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