First Mod Everyone Should Do After Buying A Chinese Pit/Dirt Bike To Improve Performance!

Video Title: First Mod Everyone Should Do After Buying A Chinese Pit/Dirt Bike To Improve Performance!

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[lazzer]

Lean idle - adjust af screw
Bog at part throttle - raise the needle
Bog at wide open throttle - use larger main jet
Sputter at idle - adjust af screw or use smaller pilot jet
Sputter at part throttle - lower needle
Sputter at wide open throttle - use smaller main jet

ALWAYS ALWAYS ALWAYS check your tappet (valve) clearance before making any carb changes/mods/adjustments. These engines are notorious for leaking valves due to zero tappet clearance. The compression should easily hold the weight of your relaxed leg on the kick starter. If not, check valves.

These engines are very easy to tune and the stock carbs work just fine.

[swalowit]

For anyone that's watching now, DON'T put the Slide and Valve Needle from a different Carb in New Carb. Also just advice when doing Carb work treat that Needle like it's made of glass, don't just toss your slide & needle on the dirty driveway or have it hanging off the end of the throttle cable banging around.

[Zanderman]

I had a small dirt cheap pitbike 70cc branded "samurai" once. These modern chinese pitbikes have developed lightyears in quality. However the problem with the samurai wasn't trash carbuetor, but it was the needle inside the carbuetor that was adjusted too tight. The needle has several positions you can adjust it and if you wan't to get power out of these dirt bikes just adjust the needle to longest travel position so that the throttle opens full. The problem wasn't the carbuetor. Samurai went from bogging to about 50 miles per hour. It was pretty enough speed for the 10" tyres. These carbuetors are exactly as good as any Mikuni. It just waste of money to invest those upgrade.

[biggestbudever]

Adjust the fuel air mixture screw it will quit bogging it's running to lean

[Gdad-]

Spring has nothing to do with gas flow and thus, has absolutely no effect on bogging/fuel starvation whatsoever! The spring simply effects how quick, or slow your throttle and slide respond, up n down inside the carb.
If its still bogging, you may need to play around with air/fuel mixture and/or jetting sizes.
My advice to you young man, , is to learn, before you attempt to teach! 👍

[derrelldurden]

you have elbow to carb gasket backwards. two o-rings shouldnt be together.

[zenthspike]

I bought the exact same carb from this video for my Coolster M-125. I had the same issue with it bogging down like he had. I moved the retaining pin on the needle down so that 3 notched lines were visible on the top of the needle. It runs flawlessly and the torque difference is very noticeable verses the stock carb.

[timdoyle]

Part of the learning process also is possibly up jetting the carburetor or down jetting sometimes you need a little bit richer mixture and also the air fuel mixture usually about one and a 1/2 to 2 turns out adjust it with the bike warm and find the sweet spot (where the idol comes up a little) Then back it off about a quarter turn open so you know you're not to lean....

[Gladiusrides]

@ExoticMoTioN that plastic gasket is to thermally isolate the carb from the heat of the engine, its so close that it would cause the fuel to vaporize in the float bowl more than without it. that foam air filter will filter better and flow better if you use proper foam filter oil or spray. you should also be swapping the Chinese spark plugs out for genuine NGK plugs. adjusting the valve lash after an hour or so of running.

[deborahchesser]

There may be a brass cover over the pilot screw, drill that out carefully as not to hit the screw, open that up 2 1/2 out and you’ll be in the ballpark

[joel]

The two o rings on the manifold to carb aren’t supposed to be together that’s why you have rev hang when you release the throttle to idle. Air is getting past the carb and into the engine so it won’t run right at high rpms because your fuel air fuel mixture is now off no amount of tuning will fix this until you flip around that spacer simple issue but greatly effects the performance of the bike

[kongenisinghetto]

The line that you took off is supposed to lead the fuel somewhere else when you fall over or crash, instead of it getting on the hot motor and may catch fire. Most bikes do not have these but they should.

[Endeavor]

I've worked on my sons apollo 110 for five years and I will have to agree 100% with removing and replacing the carb. Thanks for the video!

[iAMYOURfAthER]

I love how many mechanics are in the comments after watching you replacing the carburetor.

[craigwolfe]

Keep that clear fuel line, run it securely so that if you lay the bike over the gas will run out the bottom of frame

[matthewjoeljordan]

You should have mentioned to be very careful when putting the intake manifold back on, as not to thread the bolts into the cylinder head. Don't over tighten and use a torque wrench if possible. The alloy is very soft. I have made this mistake before.

[duanemcdaniel]

I bought my cousin a dirtbike for Christmas we switched out the carburetor change the oil as soon as we got it to Amsoil 10W-40 Synthetic Metric Motorcycle He absolutely loves it

[meganfitzgerald]

Put a light film of grease on the o ring for your carburetor heat spacer to help it stay in place better. The black plastic spacer is made of plastic to help keep the carburetor from heating up.

[tothbotond]

the "L pipe" is called intake manifold i think

[jeankarim]

I spent quite some time on my son's PZ 27 carb, for bogging at WOT cleaned the carb, no change, drilled out all the brass covers to access the adjustment screws and adjust it properly and... no change, checked the spark plug, all good, changed main jet from bigger to smaller, no change...Tried to adjust the float level and throttle needle adjustment and still no change... I think those carbs are built lean in order to pass modern emission tests on a 70's technology. I noticed a suction air sound at the main air jet when pulling the throttle, my next step, look into drilling the main air jet to feed more air to the emulsion tube. Will keep you posted.