Randy's Cycle Service Explains Carburetors, Choke & Cold Starting - vintage motorcycles. Randy's Cycle Service & Restoration in central Virginia USA. We service & restore all makes & models. We do not source or stock parts or sell vehicles. Technical advice starting at $25. Randy's Cycle Service & Restoration, www.rcycle.com
CV carburetor disassembly
Shows a CV carburetor being disassembled.
The carburetor is from a Kymco Super 8 scooter with a 4 stroke 50 cc engine.
I have disassembled and cleaned the carburetor before filming this video. Thats why the screws are comming of so easily.
Download FLV video (54 MB) :
Download original AVI video (576 MB) :
How to sync carbs on a motorcycle
This video demonstrates the procedure to synchronize a carburetor on a 1977 Honda CB550. It is really important, especially for bikes of this vintage, to synchronize your carbs at the beginning of every riding season or after any repair or adjustment to the carbs. This bike still needs some work to be road ready, but it has a lot of potential and is super cafe racer cool. If you are attempting to do this procedure yourself and have any questions before you start, feel free to let me know. That's the good thing about Youtube, FREE INFORMATION FOR ALL!!!!!
EDIT: Here are a few edits I would like to make to this video after watching it a couple of times.
1. Make sure your carb synch comes after everything else in a normal tune up. This includes Valve clearances, cam chain tension, spark plug gap/cleaning, point gap, ignition timing, air filter cleaning/replacement, and all the air bleed screw settings should be checked.
2. Engine speed for a carb synch should be around 1500rpms if possible.
3. The adjuster screw lockdown nuts should always be re-tightened after adjustment (I forgot to show it)
(5)- CARB SLOW JET ADJUST= EASY WAY
FOR OPTIMAL PERFORMANCE , THIS IS THE BEST, EASIEST UNDERSTOOD TECHNIQUE. Slow jets or air jets are very simple and have been around for decades and never changed.
How to Maintain a Motocross Bike
This is a video I made on how I maintain my motocross bike. Sorry the video is kind of long but I packed in a lot of info. If you have questions fell free to ask them!
How to repair a nonrunning motorcycle pt.1
This simple tutorial about how to diagnose and repair running problems in old motorcycles can be generally applied to all makes and models. While information specific to your bike can be found on your online forums and in your repair manual, this should get you started. Good luck.
How Motorcycle Carburetors work and how to tune and clean them
Here's a link to the kind of carb cleaner I like best (it IS the best)
How Motorcycle Carburetors work and how to tune and clean them Check out my other channel here http://www.youtube.com/watch?v=1KKvwMaIotA
Fix your Mini bike Carb - bogging, cutting out etc
If you are having trouble with your mini bike/quad whereby its difficult to start, bogging down, cutting out or overflowing then this video could help you get it running sweet.
Of course i would check firstly that there is compression, (the pull start should be difficult to pull slowly) and that there is spark. Do that by removing the spark and with it still connected to the HT lead, Place it against the cylinder and pull the starter. You should get a spark arcing across.
Carbs are pretty much the most common of all problems on these mini 47 and 49 cc engines and that can be anything from overflowing, which is caused when the float gets stuck in the bottom of the bowl or when the cut of valve gets stuck open too, to cutting out and bogging down, This is usually a blockage of the main jet. It is very important to keep the jet clean and to make sure you can see clearly through it as seen in the video. if you get dirt in here then less fuel is able to get through when on open throttle and the bike is starved, causing it to cut out or loose revs.
make sure to get the 2 stroke ratio to fuel right too. A lot of the blockage problems are generally caused by having too much 2 stroke mixed in and it turns gooey after a while.