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The new power is from the larger carburetor. Just get the new carb and put it on your old bike and the power output will be the same.

You are loosing your top speed because your engine is running lean at top speed and advancing the timing causes detonation. Rejet your carb a little richer and run better gas for optimum performance. I run 2 deg advance with larger main jet and 95 octane gas. The performance increase is very...

All after-market exhaust systems do not have a catalytic chamber where the exhaust gases are converted to less toxic substances. So, plugging the AIS means that no air is pump into the exhaust and that is it. Pumping air into the exhaust does not increase or decrease the engine performance, it...

The Air Injection System works in conjunction with the factory catalytic exhaust system. Extra air is used to help complete the combustion process of exhaust gases inside your factory muffler. If you are running after-market exhaust then this mod will do nothing.

The most important thing with a high rpm engine is the cam shaft. If you don't have a racing cam then you do not need a stronger valve spring. Just because your engine can rev higher does not mean that your top speed will increase. The CDI is also important if your engine can rev that high at...

You need to get to an authorized Yamaha dealer to buy the oil filter and they will change it for you. It cost VND75,000 each and very easy to replace. You can take the filter to any repair shop and they can change it for you cheap if you don't have any tools. I changed my at 500km, and every...

One step at a time: 1. Rear sprocket to 42-45 or front sprocket to 14 teeth. 2. CDI 3. High output coil and Iridium sparkplug. 4. Exhaust system and retune carb For the streets in Vietnam these are all you need. I ride my Sniper in Saigon and no other 150cc and smaller bikes can...

Your engine will wear out faster without an air filter. Changing the oil more often is a band-aid and not a cure.

A 4.0" rim will be wider than the width of a 110x70-17 tire. Unless you are planning to run an inner tube your tire will slip off the rim the first time you take a hard corner.

You need to disassemble the accelerator pump assembly and blow compressed air through the hole to clean it. Also, you need to make sure the pump is adjusted properly. Look at the repair manual on this site for how to adjust the pump.

You might have a clogged or worn accelerator pump. Also, pull the spark plug and see if you are running too lean.

Yes on both.

You will need a longer swing arm with 120/90-17.

Where exactly is snow mobile races in Manila? Since you don't design jet engine you would not even begin to understand high velocity air intake optimization theory.

X-project, you are the one that is missing the point. This mod is for low rpm usage whereas velocity stack are for high rpm. This mod is good for snow mobile racing, off-road motocross, and street usage where you spend a lot of time at low rpm. This mod is not recommend for high speed or...

It is not a useless mod nor will it render the upper part useless. The purpose is to create a smaller intake opening when the slide is partially opened to increase intake air velocity. When the slide is fully opened then the intake opening (above and below the divider) is the same as that...

You gain nothing at high RPM. Your gain is mostly at low RPM where the divider will generate a higher air intake velocity.

You are not going to gain any thing with this mod on the factory carburetor for two reasons. First, the factory carb is too small to realize any benefit from the smaller aperture at low rpm. Remember the T135 idles at 1500 rpm. Second, at mid range rpm of 5,000 rpm your throttle opening is...

130/70-17 on 3.50 rim will rub on the chain. 110/70-17 will not fit unless you remove the front fender.

My bike is here, but I'm not done with it yet though, http://www.yamahat135.com/forum/viewtopic.php?t=2427