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07 New to me Bike

811 Views 6 Replies 3 Participants Last post by  Beeners
Hello everyone.

I'm very excited to report that I just bought my first TW200 (2007) a few days ago. Pretty much bone stock, other than the PO replaced battery.

I'm pretty familiar with 2-strokes. I'm learning all I can about air cooled 4 strokes.

The intake track still has the rubber snorkel above the air-box under the seat. Air filter looks good and moist with filter oil.

Exhaust is stock. Baffle has never been out.

Bike responded very sluggishly when the throttle was rolled on. I could even stall it from idle with a quick throttle twist, on the stand.

I found the following jetting:

128M 31P

After I removed the plug, I found the fuel screw (FS) was 0 turns out (all the way in)!?!?

I opened the FS to 2 turns and added about 1mm of needle shims. Bike responds MUCH better to twisting the throttle now.

What is the typical jetting for 400 Ft, woods and trial use? What about the Fuel Screw?

I have not yet taken the stock pipe off. Does anyone know if there is a "reducer" or "restrictor" in the header portion of the pipe?

Is is beneficial to open up the flow into the air box?

I want to keep it as quiet as I can, and most after market exhausts seem to make it even louder. Coming off my 2-strokes, this bike is really loud. (90 db constant at 35 mph in 5th).

Please be kind to a first time poster and a first time air-cooled 4-stroke owner!

Thanks in advance.
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Another couple of questions:

Can the TK carb be bored? Is that going to help anything with the stock exhaust?

Can I add packing to the spark arrestor to reduce the noise? Is there a way to repack the silencer?

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I've got most of that taken care of. Carb if clean and installed properly. New Plug. Air-box is clean with a layer of grease on the walls behind the screen to trap any errant dust. Removed the snorkel while I was in there. Muffler is repacked and sound level is much better now.

I had to replace the clutch because the PO had way mis-adjusted the clutch cable with negative free play and burned it up. Clutch is good now and fresh oil.

The bike is a blast to ride in deep sand and fine white sugar sand. It floats on top and plods on at a nice pace. My first Ah-Ha moment was trying to follow a deep rut. Lol, the foot pegs are really wide. and will quite easily hold both tires off the ground.

It actually rails the berms pretty well, once I got comfortable with it. I'm looking forward to getting into the mountains to hit the rock gardens and hill climbs.

60 Miles so far. Have not hit reserve yet.

In my eye, the beauty of the TW is the lack of power! It's all about carrying speed and using the knobs on the sidewalls of the tires.

I just want it to run as best as it can without spending any major cash. I realize it is what it is: a very durable slow-revving sand eater!

Thanks so much.

Beeners in NC.
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Forgot to post a picture

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Found some main jet part numbers.

288-14343-63-00 125M

288-14343-64-00 128M

288-14343-65-00 130M

288-14343-68-00 135M

288-14343-70-00 140M

Slow but good prices at
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