To hopefully remedy the weird engine performance behavior when trying to do steep highways and not being able to hold 55 mph when above 10,000 ft (3028 meters); I swapped out the main jet in my 2006 TW200's carburetor.
Based on info I found on the tw200 forum, I had bought Keihin Jets from carbjetkits.com:
1 x Main Jet 99101-393-105
1 x Main Jet 99101-393-110
1 x Main Jet 99101-393-115
The last number is the size of the jet. The stock jet the TW200 came with is size 125 and the theory is its too much fuel above 10,000 ft where there's less air for the air/fuel mixture. (Thanks RichardM for the reminder)
You have to remove the fuel bowl at the bottom of the carburetor to access the jets so I had to loosen the worm gear hose clamps, unhook the fuel line, and also unhook an air line going into the exhaust side manifold of the carburetor.
Then, I could rotate the carburetor's bottom side to the left so I could access the fuel bowl screws:
Once I had the bowl off, I also checked the size of the idle jet:
Idle Jet
Then, using an 8mm wrench to loosen the main jet assembly, using same wrench and I think a 6mm wrench, I removed the 125 jet and replaced it with a 110 jet:
#110 Keihin Jet now in place
Putting everything back together went smoothly, made sure the carburetor was as level as possible, reinstalled all removed hoses....went for a test ride and she ran as normal. Hopefully I'll find some high altitude riding during this coming camping trip to see if it helps or hinders.
I geared up and rode to the RV storage yard to pick up Umarang and Yagi held 55 mph just fine. In fact, I had to throttle back at one point because I was inadvertently doing almost 60 in a 40 mph zone!
The above speed could have been a result of one of three DAC*s trying to kill me with their cars though.
Retrieved the URRV, trailering Yagi back using the Pitbull Restrain System.
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Water notes: Overflow tubes started at 30 gallons per the water meter as expected. Put 6 gallons in the water heater tank and an additional 17 gallons in three containers for washing; 5 gallons in separate jub for flushing the toilet.
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Got 12 replacement caps for the ends of the steps of the RV ladder for $24 from here: LINK, some of the original ones are cracking and falling apart so I'll be replacing the ones that need to be replaced.
4 comments:
You may also want to check the air filter as that could also cause it to run rich. And, bring your infrared thermometer to make sure you aren’t running too lean. Is the TW air cooled?
Checked the air filter , seemed clean.... there’s apparently a hack to drill a hole in the airbox to allow more air but I have not reached that point yet.
The TW is in the air cooled. I’ll have to try and remember the Thermometer probe when I go riding.
The TW is indeed air-cooled.
RichardM, should have mentioned, a TW200 owner used size 105 jet at above 12,000 ft successfuly.
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