I'm going to pull the restrictors out today. Just wondering why do I want to go to pre-mix? Does this give some power gain? Also do I have to change jet sizes if I just pull the restrictors? Seems to me I should have to?

 

Unless you live at an altitude above 2500 ft., Kawasaki/Suzuki ships these units to operate well from sea level to 2500 ft. Removing the restrictor has very little affect on the jetting because Kawasaki/Suzuki already tuned it for no restrictor - believe it or not. Worst case, your main jet will not be right at wide open throttle - so you go up or down on a main jet to fix that. After that, you adjust the Jet needle for best 1/4 to 3/4 throttle operation. Your Carb comes with a pilot air screw for fine tuning of idle and very low speed operation, this is your 'best friend' tuning tool to keep both you and your kid happy. A toy that won't idle or dies everytime you come to a stop will take all the fun out of it real quick.

Your unit has oil-injection, no need to premix oil together with gas before filling the fuel tank. Unless the oil-injection system is faulty or clogged, there is no reality performance gain by premixing your own fuel. Use what Kawasaki/Suzuki reccomends for oil and you'll be fine. Oil in the fuel only lubricates the rod bearings, piston, rings and cylinder. Too much oil ratio and you build up deposits and foul plugs, too little and you mechanically destroy parts. [img]i/expressions/face-icon-small-shocked.gif[/img]

 

Well I just pulled the exhaust and no restrictor but the gasket is smaller than pipe. Should I cut it out? And now that I see that exhaust is not restricted if I do the carb and intake is there going to be any big change in power or not? I'm starting to think that maybe I should just get a bigger bike for him. Poor kid is watching his sister do donuts in the snow with her 90cc badger and he can't even spin his tires. He is getting pissed at dad!

 

1)Check out a website called bikebandit.com. Go to the OEM parts section, enter in year, make and model of the quad and check out the various tech drawings. There under the muffler section you will see that there is a gasket and a restrictor. They are different, hope this helps determine if the restrictor is still there or not. The gasket should be close to matching the exhaust flange on the pipe, I wouldn't mess with the gasket unless it isn't correct. Maybe your gasket is missing and the restrictor is the only part in there. Try to end up with no restrictor and a gasket for sealing the pipe to the head(important to retain power). The restrictor will affect the entire powerband, even tire spinning.
2)There is what looks like a throttle limiting screw on the mount for the thumb throttle. This would limit the thumb lever from going to full throttle(you adjust this). The drawings aren't crystal clear. This limiter screw won't help the tire spinning, it will only affect top speed.

Here is another reality check, that 50 does not have a variable transmision, it is only one speed so to speak. This means that it will behave like a three speed automatic car that is stuck in 2nd gear. Therefore starting from idle to 5 mph sucks and top speed is probably 12 mph, if even that. About the only thing you can do is re-gear the chain drive for more low end rpm and suffer top speed loss, or get to the clutch and lighten the fly weights. Lightening the fly weights will delay the clutch to engage until a higher rpm by the motor(this will help tire spinning). Most 50 quads won't spin tires unless modified, sometimes lots of $$$ modifications.

 

There is an intake restrictor and a piggy back jet to the pilot jet. Here's a response from another thread...

1- Exhaust Restrictor- Remove the exhaust pipe from the cylinder and there is a washer in there...just pull it out and bolt the exhaust back up
2-Intake Restrictor- In the arm that is between the carb and the cylinder....On the side that goes to the cylinder you will see a thick spacer in the end with a thin slit.....Use a screwdriver to try to turn it until comes out..many have to use a torch to heat the spacer up to get it to turn...maybe you will be lucky and not need to....
3-Carb Piggy back jet----Flip the carb upside down, remove the bowl cover....you will see the main jet directly in the center..then right next to it you will see a very small opening where the pilot jet resides.....remove the jet in that hole...it is about 3/16" big.....the pilot jet will still lbe in it's place once this piggyback/restrictor jet is removed)

Bikebandit.com shows the pilot jet to be #38 and this piggy back jet to be #15. Lot's of adjustment by the pilot air screw and idle stop screw should dial in the idle with this #38 pilot jet. If not, a different pilot jet will be needed. Good luck

 

The i d on the exhaust gasket was the same a the exhaust port in cyl and no restrictor in the pipe. Must be the dealer took it out. I did take the piggy back pilot out leaned out the needle jet and removed the intake restrictor. Nice difference in power. Still can't spin the tires but much better on acceleration. The kid is happy for now but I don't it will last for long when sissy goes blowing by him. I think dad is going to have to go shopping soon. Thanks for all the help guys.