hello all. wondering if any one has some advice for me on my sons Kazuma 90. The quad turns over but will not start. I have checked and do have spark, i have cleaned the carb. I'm stuck and would appreciate any and all advice. Thanks in advance.

 

If you remove the fuel line from the carb, and turn on the valve, does it pour out? Is there a filter?

Have you checked for compression? Pull out the plug, hold your finger over the plug hole and crank it a few times. [make sure the plug wire is not close to your hand] A 90cc should easily push your finger off the hole, or at least the air should push out past it.

If you have compression, try to put a few drops of gas right in the plug hole, install the plug and fire it. That or try some ether in the intake but, not too much. If you have an open valve, you could have a fire in the exhaust or the intake.

If there is no compression, or it feels like your finger is being sucked in then blown back out, you may have a stuck valve. I think the 90 has valve covers {for the adjusters] on top of the head. If so, take them off and watch it as you turn over the engine to make sure the rocker arms are pushing the valves and the valves are coming back up.

 

Here is a link to a Kazuma parts site...just in case.

Kazuma ATV Parts - Kazuma ATV - Kazuma Parts - Meerkat 50cc - Falcon 110cc - Chinese Engine Parts

 

Sorry for the unfinished thoughts...Saturday morning and two little boys in and out begging to ride their quads in 20 degrees....

If you do have compression, even at a basic level, and you have spark, it's down to timing or carb issues. Even with bad timing, it should "chug" a bit. A timing issue could be a stretched timing chain and it's best to replace it so it doesn't smash the valves.

Like I mentioned, remove the fuel line. If there is no flow, and you have a filter, pull the filter. Still no flow, change the fuel valve to all its positions. Still no flow, check if there is gas in the tank...lol. Seriously, if the petcock is clogged, take off the tank, empty it and pull the petcock and check it.

If there is good flow from the tank, try the bleed screw at the bottom of the carb bowl to see if the gas is reaching the carb. If it comes out brown, you may still have junk in the carb. If it doesn't flow out, your inlet may be plugged. In that case, take off the carb, tear it down and soak it in carb cleaner. [remove all rubber parts first] Pull out the jets and clean all the little nooks and crannies. Even with a filthy carb, you should get "something" out of it.

I try to add Marvels Mystery Oil [MMO] to all my gas engines. It seems to keep everything clean longer. A tiny bit in the oil as well. Maybe someone on here might have another product they like better but, straight gas is brutal anymore.

Good luck.

 

geoff,

thank you for all of the tips. I will be working on the thing today and will let you know how it goes.

by the way, I do have compression. i have a feeling it is the carb.

 

I hope you get it. I've been away from this for allot of years. I bought a Yamaha for my son and started troubleshooting. It seemed to wake it all up in my brain...lol. Sort of like riding a bike, no pun intended.

I'd like to hear what you found. It's good for all of us to help each other troubleshoot these situations so we can pass it on to the next person, and most importantly, save some cash.

 

Ok, so far it still hasn't started. I had to take a break, I'm playing Mr.MOM today with 3 boys(kind of hard to get anything done!!)
I went through and redid the carb, fresh gas, new spark plug, i tried with a little starting fluid and got a back fire. I figured it was getting close, kept trying (W/O starting fluid) and it wanted to start. If I let it sit for about 10 minutes it wants to start when I first try, but wont. The battery started going south so I've got it on a charger now.

I bought this quad from a "buddy" of mine, who told me that it just needed a battery. I have already replaced the ignition, start switch and starter relay. oh.. and of course a battery.

 

Have you tried adjusting the valve clearance? They tighten up with wear, and they also tighten when the engine is cold. Thus the first symptom is progressively harder starting when cold, leading eventually to no starting.

 

The backfire is saying possible valve problem. Maybe just an adjustment needed. No "pops" or "chugs" through the intake?

It sounds like the exhaust valve is opened a bit on the compression stroke. If you can, take off the valve cover on the exhaust side and give the rocker/valve stem a quick shot of PB Blaster [or any penetrating oil], shoot a bit down the plug hole and spin the engine, without the ignition turned on, to spread it around. If the quad sat for a while with no oil in the head, and condensation build up, it could be a sticky valve.

I'm "Mr. Mom" to my two boys today too. Just the fact that you got your hands on the machine today is impressive enough. Thankfully one of our two machines is running and they could ride today. Otherwise I'd be working on a machine in 3 minute spurts in between the, "DAAAAADDY, HE WON'T SHARE HIS CRACKERS....HE'S TOUCHING MEEEEEEE!!!!!"

LOL

Good luck.

 

The Beast is Alive!!!! well, kinda......it starts.

I can get the machine to start if I play with the throttle and choke, it seems like I have to pump the throttle to full throttle about 3 times then start with the choke on while still pumping the throttle. I ran it for about 15 minutes straight, I have to play with the throttle because it will not idle at all.

I definately need to adjust the valves next. Geoff and Lynn I appreciate all of your help. This is the first time i have posted on any forum, and you guys make it worth while.