I have a Kazuma 50cc fourwheeler that my brother got for Christmas Last Christmas. It has worked good until this winter. It will not start for us. We have taken it in to a mechanics shop in town and they are re-jetting it for us. We have ordered 4 different jetts from either the Honda dealership or just a catalog and we can't find a match. Does anybody know where we can find a jet that would fit for us? Isn't the Kazuma a Honda knock-off?

 

I have a Kazuma 50. I have not had a starting problem and it's cold up here in WI. Even with very bad jetting, it should still start. Have you changed the plug? They come with a Torch. Another potential source of trouble is moisture in the kill switch. It is unsealed with open contacts. A little water will short it out.

Mine's been running good. I did have to change the needle position because of a lean midrange causing a bog. I went down one groove with the clip.

I don't know anything about parts availability, but Raceway claims they stock everything.

I belive the motor is considered a Honda design. This may not be true for the carb, but one person claimed the carb was the same as a Honda 70. Good luck.

 

Hey thanks for the info. We have changed the spark plug and all of that. We are now able to get it to start, however we really need to know how to get a jet that will fit this thing. Whenever my brother gives it gas it really bogs down. I think this means that it is running rich. Our elevation is 4775 feet. I have been reading that some of you guys got an owners manual that lists all of the parts. Where can I get one of these? Does anybody know how I can get a jet that will fit??

 

You can download the manuals here http://www.kazuma.com/shop/productde...id=1&class_1=1

For parts contact Raceway ATV, they are a sponsor on this site.

Mine was bogging real bad too, I lowered the clip on the needle in the carb one notch (richer in the midrange). This helped a lot. It still boggs if you give it full throttle quick from idle, but it doesn't have an accelerator pump so that's expected. At your altitude it may be too rich, but mine was way lean.

Hope this helps.

 

Check your intake valve clearance. My neighbor has the same quad and has to keep adjusting the intake valve, it gets to tight.

 

Jetting 101:

Posted: Thu Feb 03, 2005 10:43 am
Post subject:

--------------------------------------------------------------------------------

Too lazy to re-write this, but in general this has helped me a WHOLE bunch:

I stumbled accross some racer's jetting guide that used the approach I listed below. Has worked great and doesn't cost $3 a pop. Worked especially well on the kid's 2-stroke which is ultra sensitive to jetting.

Each to his own, but I'm telling you it worked from pilot up.


If you suspect a lean condition (not enough fuel):
1. Does it run better at partial choke? Yes, then jet up. No, go to 2.
2. Partially block your air filter/airbox snorkel. Does performance improve? Yes, then jet up. No, then you're not lean.

If you suspect a rich condition (too much fuel):
1. Take the lid to the airbox off (remove snorkle for the mini...whatever). Does it run better? Yes, then jet down. No, go to 2.
2. Get on an open stretch where you can run it at full throttle. Turn the gas off. Does it run better as the carb runs out of fuel? Yes, then jet down. No, then you're not rich.

----------------------------------------------------

If you can't find jets, you can buy micro drill bits from harbor freight and drill out your main. They cost about $20. If you go too big, fill it in with solder and re-drill with a smaller bit. But I'd try the needle clip position first. It will richen you from about 1/4 throttle up. Good luck! [img]i/expressions/face-icon-small-cool.gif[/img]

 

Thanks a lot for the help guys. We took the carb to a machine shop and had them drill it out and re-tap it to fit one of our jets. Hope it runs good (we are changing it from an 80 to a 50.) It is supposed to be done on Tuesday and we leave for a trip to St. George Thursday, so we are crossing our fingers.

 

Horedog,

I've rebuilt small engines and their carbs for years but only as a consumer/amatuer. I've got my son's 50 carb torn down cleaned and reassembled as we speak. I'm not sure what you mean by the phrase "went down one groove with the clip" would you mind explaining what you mean by that phrase. Also the flexible rubber tube from the filter to the carb intake is shot letting unfiltered air/dirt in which is why I tore the carb down. Have you found a aftermarket solution for the flimsy rubber tube?

 

The needle in the carb? Take it out, see the "c" clip? Move it down one notch this will make it richer from 0-1/4 throttle.
Great carb web-site. Call them if you don't see your jet
http://www.rageperformance.com/

 

Desertbum is right. The needle has different settings mainly for temperature. Lowering the c clip richens up the idle circuit for colder weather and raising it leans it out for warmer weather but you can lean it out too much or you will burn up a piston. Thats where the plug color plays a big factor in the idle circuit.