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I've got a 2003 TW200 and ever since new it has always been easy to flood when it's cold. Every since new, if you touch the throttle when it's cold it will flood and not start. I have to pull the plug and dry it out and try again. Once it's warm, it runs and starts great. I live at 2500 feet and have used it in the desert alot, but just bought a mountain get-a-way and want to use it there where it's about 8500 feet. I don't know, but could it be it is just very rich and may need to be rejetted. If so, what size jet should I start at? It is all original and the carb has never been off, maybe a new carb?
Any suggestions will be great. Thanks.
 

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At 2500ft OEM jetting should be fine. It's extremely lean out of the box at sea level, as you go up it comes closer to ideal but I'd venture a guess you could still use another 1/2 turn or so on the idle screw (hidden under a plug on the bottom of the carb). But that wouldn't be causing the problem you have. After it stalls, the plug is soaking wet? Opening the throttle delivers more air, not fuel, so when an engine craps out blipping the throttle it's more often that it's too lean, and the extra air kills it.

The only thing that comes to mind if the choke floods it out is the little rubber plug that restricts what the choke circuit can draw (if you pop the bowl off, there's three tubes extending down into the bowl. One holds the pilot jet, one holds the main and jet nozzle, and the third should have a rubber stopper in it. If that stopper is leaking/missing/fell out (rare, but have seen it), the choke will draw waaaay too much fuel up and rather than give a rich fast idle, flood the engine out almost instantly.

I'd pop the carb off (not difficult) and have a peek around the bowl. Check that rubber stopper is in place and snug. After 15 years, carb could probably do with a cleaning.
 

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Discussion Starter #3
At 2500ft OEM jetting should be fine. It's extremely lean out of the box at sea level, as you go up it comes closer to ideal but I'd venture a guess you could still use another 1/2 turn or so on the idle screw (hidden under a plug on the bottom of the carb). But that wouldn't be causing the problem you have. After it stalls, the plug is soaking wet? Opening the throttle delivers more air, not fuel, so when an engine craps out blipping the throttle it's more often that it's too lean, and the extra air kills it.

The only thing that comes to mind if the choke floods it out is the little rubber plug that restricts what the choke circuit can draw (if you pop the bowl off, there's three tubes extending down into the bowl. One holds the pilot jet, one holds the main and jet nozzle, and the third should have a rubber stopper in it. If that stopper is leaking/missing/fell out (rare, but have seen it), the choke will draw waaaay too much fuel up and rather than give a rich fast idle, flood the engine out almost instantly.

I'd pop the carb off (not difficult) and have a peek around the bowl. Check that rubber stopper is in place and snug. After 15 years, carb could probably do with a cleaning.
Thanks - The plug is very wet. I'll clean the carb this weekend. Do I need to pull the air box out to remove the carb? Is it better to just buy a carb off of Amazon or install a rebuilt kit? Seems both about the same money.

Thanks, again for your help.
 

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There really shouldn't be any reason to replace the carb. I'd stick with the factory Teiki. A rebuild after 15 years wouldn't be a horrible idea.

The airbox doesn't have to be removed. You can work the carb out and back into the boots, although getting the airbox boot back on can be a little tricky but is doable. I have heard some people unbolt the intake book from the head and slide the whole thing out. Sure that works fine, but once you've done it once or twice slipping the carb back between the two boots isn't a big deal. A right-angle pick makes peeling the airbox boot back around the carb mouth pretty easy.
 

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I've got a 2003 TW200 and ever since new it has always been easy to flood when it's cold. Every since new, if you touch the throttle when it's cold it will flood and not start. I have to pull the plug and dry it out and try again. Once it's warm, it runs and starts great. I live at 2500 feet and have used it in the desert alot, but just bought a mountain get-a-way and want to use it there where it's about 8500 feet. I don't know, but could it be it is just very rich and may need to be rejetted. If so, what size jet should I start at? It is all original and the carb has never been off, maybe a new carb?
Any suggestions will be great. Thanks.
Don't twist the throttle when it's cold. Let the choke do it's job
 

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.... want to use it there where it's about 8500 feet. I don't know, but could it be it is just very rich and may need to be rejetted. If so, what size jet should I start at?
Any suggestions will be great. Thanks.
I would recommend a 122 main jet for anywhere from 7,000 to 9,000. 118 for above 10,000. Last summer I took my 2018 with the 122 in it up to 12,500 feet but it sure didn't have much power....I stayed mostly in first up there on the steeper stuff.
 

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The guy I bought my 2003 from told me not to use the choke when starting the engine when it’s cold, or to twist the throttle. He started it and then pulled out the choke knob, and ran it like that until it warmed up. I’m at sea level and I’m now thinking it may need a new rubber plug that restricts what the choke can draw - as described by RaZwd1 above.
 

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