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Discussion Starter #1
I'm an old guy that has been riding bikes for over 50 yrs. I've owned at least that many bikes and have raced and wrenched on my own for years. First, I've read some posts about TK carbs. I just bought an '08 with 94 miles. My first concern was the carb being plugged up. The seller said it was drained prior to storing. It started right up but was storming bad so I didn't ride it. It would idle with the enrichener all the way off so I figured it was OK. Got it home and it wouldn't take the throttle at all. So this morning I pulled the base off and it really looked clean. I removed the pilot jet which is plugged (at least I can't see much light threw it). I think it's a #31, my 70 year old eyes aren't that great, can someone verify that size. I usually go one size larger on the pilot in my dirt bikes. Also I read that the idle air screw is usually around 1 3/4 turns and needs to be 2 1/4. Mine was only about 1/2 turn (the plug was still intact). I'm only going to use this for a pit bike but I need it to run good, especially if the DW want to ride it. Thanks in advance for you help.
 

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Sorry I can't help. I've got a 1987. The pilot in that is #45. I think I heard that the numbering system changed thru the years, so don't go by mine.

But good to hear from you. I hope I'm still riding at 70. Bet you got some good stories! P4080036.JPG
 

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Well, it did say 31. I went to the local dealer to buy a new one but of course they didn't have one. The good news is that they cleaned mine for me for free and with the air screw adjusted properly it runs great.
 

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I was going to suggest removing the plug so you can adjust it yourself....also possibly rejetting the main jet to a larger size seems to help the TW.
 

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I was going to suggest removing the plug so you can adjust it yourself....also possibly rejetting the main jet to a larger size seems to help the TW.
I said great, but what I should have said is better. Still needs more fuel off idle. Does it need the needle raised like I've read in a few posts? I'd put a larger pilot in but they don't list one.
 

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Check for an air leak of some sort on the rubber intake boot. My bike uses the old style carb, but if it needs more fuel maybe there's air leaking in up front of the carb before the engine. The rubber boot on my bike was coming undone from the metal base part.
 

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My understanding is you will not need a larger pilot,just the pilot adjustment screw turned out approx 2-2.5 turns.Depending on your elevation,you would want a larger Main jet.....I believe the OEM main on my 09 was a #126.I replaced the #126 with a #130 and the pilot turned out as suggested.....bike run much better and COOLER.Yes,raise the needle as suggested by the posts. Sorry for the late reply.
 

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These bikes are set up lean stock. Typically, changing the pilot jet on these bikes is not necessary. Read http://tw200forum.com/forum/performance-customization/982-carb-mods.html and the tuning thread http://tw200forum.com/forum/technical-write-ups/591-carb-tuning.html. The most popular set up on the post 2001 bikes here seems to be a 130 main jet, shimming the needle 0.03-0.05", and turning the pilot screw out from light seat 2.5 turns out. Your mileage may very (YMMV), as the set up I chose is a 128 main, needle raised 0.04" and 2 3/8 turns on the screw. If you truley want to try a larger pilot jet, you can get a #34. Here are some part numbers:

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)

5LB-14342-65-00 = 31 (TW 01-13 STOCK)
5LB-14342-17-00 = 34
 
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