Runtong mpg efficiency 2x better than NT carb

javy mcdees

javy mcdees

Active Member
NT carb seemed to have better low to mid range power but would get 20 miles to a tank 1/2 gallon roughly.

Now the Runtong after the 3rd purchased carb, finally got a good one and she gets almost 45 miles to a half gallon and runs smooth at cruise with power on tap at cruising speed of 30 mph and will be in the power band and accelerate great up until 40 mph top speed. 39 tooth sprocket.
My low end power is not like the NT carb anymore but I since added a ported cylinder and cut the piston up.

Using a C7HSA NGK plug out of the box gap setting and here is an example of the tune. mixing 100:1 AMSOIL SABER blend

When looking for the Runtong Carb I noticed the brass tube jet in the throttle bore index would be off to one side or another, kept looking through boxes till I found one that was drilled square and lined up proper and now it runs good finally. Until the mount flange breaks off:-||

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First of all what kind of air filter is that, never seen dem, how do you ride bike to work with out no one steeling it, okay I can help out on plugs, try a Bosch plug, exallent for power, speed, make sure you tie down tight, and if you have a kill switch, try stopping motor by shutting choke off, instead of using kill switch, and what kinda carb you have, is it manual choke, or spring loaded,
 
Out555 said:
First of all what kind of air filter is that, never seen dem, how do you ride bike to work with out no one steeling it, okay I can help out on plugs, try a Bosch plug, exallent for power, speed, make sure you tie down tight, and if you have a kill switch, try stopping motor by shutting choke off, instead of using kill switch, and what kinda carb you have, is it manual choke, or spring loaded,
Click to expand...
Kendall 2 stroke synthettic oil, premium gas, with a ounce of 401 octane boost, you can do it all in gas tank makes no diffrence just make sure you shake tank well, or shake bike well, use 3 1/2 ounce of oil, for a 2.5 tank, work way down, till looks good,
 

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the only issue I have is it will not idle long term but that is not really an issue for me. usually have to cu the engine when a cop is looking so clutch it and the engine dies and I pedal away from ossifur friendly
 
Out555 said:
First of all what kind of air filter is that, never seen dem, how do you ride bike to work with out no one steeling it, okay I can help out on plugs, try a Bosch plug, exallent for power, speed, make sure you tie down tight, and if you have a kill switch, try stopping motor by shutting choke off, instead of using kill switch, and what kinda carb you have, is it manual choke, or spring loaded,
Click to expand...
bought all the fancy filters and all fell off the bike got lost so I made my own now it do not fall off no more.
 
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