bumpy, bumpy

 

I haven't joined any threads in the last couple of months as everything has been going fine. Well not it's not & I am stumped. Last month the 90cc Kazuma I got for grand daughter started to run bad & was "popping." I pulled plug, it was fine. Pulled off seat to clean air cleaner ( it was a little dirty) when I noticed there was only one bolt holding the carb to manifold. Got a new bolt , put back together & it ran. Well, with the holidays the atv didn't get used & when she tried to use it yesterday, it only ran a short while, (maybe 10 minutes) & at idle would load up on gas. I have not been able to adjust the carb, nothing changes when I screw in or out the mixture or the speed. I have cleaned the air cleaner, pulled both idle screws completely out & shot carb cleaner in their holes, replaced them & it still acts the same. It will start up & idles very rough. As soon as throttle is open, it quits. I drained all the gas & started out with fresh. I also drained the carb bowl. It seems to "bang"when idling. Could it be a valve adjustment? I have never adj valves.

 

The gel pack in the float bowl mentioned in the first or second post on this topic - should it simply be removed before gas is first added? Or does it serve some break-in purpose? Will letting a brand new engine idle for 30 minutes hurt anything?

I have always found the instructions to say that varying amounts of light to medium throttle are the most appropriate during break-in.

 

If you have not put any fuel in the quad yet, I would remove that gel pac. It does nothing for break in, it is just a shipping pac. They tell you that it will dissolve in the carb when you run fuel through it, but I have heard more and more of these things clogging the jets. I would just remove it if you haven't run fuel through yet.

 

Just like GOD said it is just for shipping purposes. It helps from keeping the float from bouncing around durring shipping. If you let the quad idle for the 30min this should have dissolved all teh gel pac and you can also do your tuning in this time. Its when people just add gas and go is when the jets suck up too much of the gel and gets clogged. I am not sure if newer quads have the gel in them anymore. It has been a while since I have bought one. I have read about carbs being bad from shipping. Floats cracked and out of adjustment so this would make me think most dont have the pacs in them anymore. If you let it run for the 30 min this will take care of the ones that do have the pacs then you can do the rest of break in period after.

 

Ok, removed the carb prior to adding fuel in the Sunl 90 and there was no gel pack. Everything looked clean and shiny new (as shiny as cast aluminum can look). I took the advice in the previous posts and dropped the clip to the bottom position (It is 30 degrees here).

Got her back together, added gas and started her up for the first time. After some idle speed adjustment, I had her purring like a kitten.

Notes to other chinese quad noobies:

1) Be sure stop switch is set to "run"! Unlike my Polaris, the Sunl will crank with the engine stop switch in the stop position, but will not start. Same goes for the Remote kill - be sure to hit the unlock button.

2) The Sunl 90 is not real big on the choke. After the first 30 seconds or so (Even at 30 degrees F), it preferred the choke to be off.

 

2manytoys,

I have just purchased a Redcat MPX90U in December. At the end of January, I had to take it back to the distributor becasue it was alomost impossible to start. I live in the upstate of SC so the weather is cold but not freezing. It was so hard to start the I would kill the battery trying to do it. So the dealer said it was becasue the jets in the carb were clogged. I had to pay $40. They said it was my fault and it must have come from my gas can. After reading your post, I'm doubting that it was my fault. I have tried to contact Redcat directly but no luck. I get put on hold for 15 minutes every time and I frankly don't have that kind of time to waste so I hang up. I am very frustrated with this thing and I appreciate any help you can give me. I have never worked on small engines so I am not sure if this is something I should try or not. Your instructions sound pretty simple but I would not want to try anything and void the warranty or mess the carb up. I would hope the dealer would have known about the gelpac and run the thing before they put it on the showroom floor. But if not, have I messed up by riding it as soon as I started it?
Also, I see another person has posted a similar problem titled "Redcat MPX90" . You might want to help them out also. Thanks for any advice you can give me.

 

Sounds like the dealer does not know what they are talking about. Usually the gel will dissolve even if the jets are clogged but it does take a while and makes tuning the carb impossible until it is dissolved. I think that anyone that can turn a screw driver can tune the carb themselves. One thing about these is that they are very cold natured. This is where you have to adjust the clip on the needle for colder weather. This helps out greatly. Do you have a manual or automatic choke on your quad?

 

It is a manual choke. It it supposed to sound like it is sucking air when you first start it? Is there any manual or instructions I can get for these in order to work on them?

 

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