[NEPA450R]

Hello TW riders,



A friend of mine brought a bike to me the other day. A 2004 TW200. He bought one of those 6 Sigma jet kits and a DG slip on pipe. He has asked me to install everything and get it to run right. So far I am at complete loss. I changed the main jet to a 132.5, installed the pipe, removed the airbox snorkel, raised the needle with the included shims in the jet kit and turned the air screw out 2 and a 1/2 turns. The bike starts easy and runs good, until it gets warmed up. When its warm it gets a hesitation up top(over 6000 rpm.). I'm in PA and we are about 500 above sea level. It almost seems like the bike needs more air. It runs good with the cover off and filter removed(I know, thats a big No-No). The plug is a DR8EA and right now after about 20 minutes of running. It has a whitish-brown color to it. Any info would be great. I hate to keep ripping the carb out of it and risk ruining the boots. Thanks guys!

 

[RodneyReed]

Hello TW riders,



A friend of mine brought a bike to me the other day. A 2004 TW200. He bought one of those 6 Sigma jet kits and a DG slip on pipe. He has asked me to install everything and get it to run right. So far I am at complete loss. I changed the main jet to a 132.5, installed the pipe, removed the airbox snorkel, raised the needle with the included shims in the jet kit and turned the air screw out 2 and a 1/2 turns. The bike starts easy and runs good, until it gets warmed up. When its warm it gets a hesitation up top(over 6000 rpm.). I'm in PA and we are about 500 above sea level. It almost seems like the bike needs more air. It runs good with the cover off and filter removed(I know, thats a big No-No). The plug is a DR8EA and right now after about 20 minutes of running. It has a whitish-brown color to it. Any info would be great. I hate to keep ripping the carb out of it and risk ruining the boots. Thanks guys!

From what I've read, the 132.5 may be a little too high, although it may be appropriate for the DG pipe with intake snorkel removed. I would try a 130 and see what happens. I've also read that there are different types of jets that will fit but have different numbering schemes. You might compare what you have to the stock one to see if the difference seems reasonable based on the numbers.

 

[pgilles]

Agreed 132.5 sounds like a bit too much, but give that thing more air than just the snorkel removal. Then jet accordingly.

 

[bobbalouey]

I am currently having the same problems with the same jet kit and slip on muffler. the jets in the kit, I have come to the conclusion, are worthless. after alot of trial and error and research on this forum and parts outlets I hope that I have found an answer. Querty , I believe sent me to the right place and jets, I hope these Yamaha jets are the right ones,i I ordered them today for less than $4.00 each but $16.00 shipping.



stadiumyamaha.com



#128 jet p# 288-14343-64-00

#130 288-14343-65-00

#135 288-14343-68-00

#140 288-14343-70-00

you must start your search with the prefix 5fy instead of 288



pilot jet #34 p# 5Lb-14342-17-00



My brother who has had similar problems with 3 different brands with similar "vacume" carburators says that I will eventually scrap my stock carb and replace it with a flat slide when i get tired of messing with this one

 

[timberfalls]

Thanks for posting info good luck-fixed yet???

 

[qwerty]

Some late TWs I've tuned liked the 132.5, but not raise the needle. Some liked the 130 better, but with the needle raised a bit. None liked the 132.5 with the needle raised. They all did exactly as you described--crank the throttle and get a delayed reaction. None liked the 130 without raising the needle. Off-idle and midrange bog.

 

[bobbalouey]

OK so far 99% tuned with a #130 main jet, a #34 pilot jet, one shim under the needle, and a #59 hole drilled in the needle slide. I get a small miss after a heavy decel then jump on the throttle in the lower gears, thinking of thining the washer with emery cloth first, then maybe try plugging the hole-later. my new rack and saddle bags are in and I gotta ride

 

[qwerty]

That bog after decel at high rpm is annoying. Some do it, some don't. Never have figured it out. Best I cvan tell it's more related to the fuel being run than anything else--E10 seems to do it worse than E0 on those bikes that suffer from it.