Hi I was wondering if anybody had any info or experience with this problem. My sons quad never had a problem before. Then it started to run a little rich (you could smell it) and has progressively gotten worst. The plugs will come out just looking black. Sometimes you would have to clean it just to get the quad running again. Now it is at the point of it barly starting if it does at all. When i do get it going it is running way to rich. I try to set the carb but it seams like it is not really doing to much. Try this for about 5 minutes and it would not start again. Pulled out the plug it is black (it was a brand new plug). Maybe the wrong plug? (I don't think so...) I am at a loss. Any and all help would be great; please.

Edited: 05/12/2008 at 05:17 PM by mcmoose

i'd replace the plug, ngk c7hsa and do a valve adjustment before getting to excited, set the intake at .004 and the exhaust valve at .006. the valve adjustment should fix the hard starting problem

Ok, i have never adjusted vlaves before nor do I know how. Is this something I can do for sure? Is there a step by step guide anywhere. And yes C7HSA is the plug i use. And it was new.

mcmoose,

Here is a video. How To: Adjust your valves

Good Luck.
SB.

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'07 Honda TRX 250EX
'05 BMS 150 SOLD this piece of _RAP, but it served its purpose.
'04 TRX 300EX
'04 Suzuki DRZ 250
'04 Yamaha TTR 90
'04 Honda CRF 150
'03 Honda CRF 150
'02 Yamaha YZ125
'02 Yamaha YZ426F
'81 Honda 185 ATC

Mild Torture Test
http://media.putfile.com/150cc-Quad

Thanks for the video. He makes it look rather easy. I guess I will give it a shot. If this will help the hard starting. Then what do I do about it running to rich?

Well here is an update. What i did was take off the carb and clean it. It was full of junk. Put it back on and the quad started and ran no problem. Sons drove it for about 15 minutes and the bike died and would not start again. Removed plug and grounded it and found out it has NO SPARK now. So needless to say I am back to the drawing board trying to figure out this problem now. Any ideas from anyone?

Did you adjust the valves yet? No joke it will run like new. Ours had the same problem and my buddy adjusted the valve in like 10 minutes. Started and ran like new again.

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07 650 Outlander Max XT
01 DS650
00 DS650

No I did not adjust the valves yet. I figured after I cleaned the carb it ran so good what was the point of adjusting them. My problem now is no spark. I don't think adjusting the valves will help with that. Or will it?

I dont know how much you troubleshoot stuff everyday but I know as soon as I think I know whats wrong and am dead set on working on that assumption I end up finding out it was something else.

If his quad has alot of hours on it I bet its the valves, especially when you say it became harder and harder to start over time.

Other than changing the spark plug (whic hI bet you have done) is the battery the original if its a few years old? My sons battery showed charge but didnt have enough power to kick over the engine. New battery solved the problem after I and the dealer were dead sure it was the starter....

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07 650 Outlander Max XT
01 DS650
00 DS650

Edited: 05/12/2008 at 04:49 PM by BigJon

I am not saying you are wrong but I still think that if I adjust my valves right now that I will still not have any spark, and that is my only problem right now.

After I cleaned my carb it started really easy. Just like it did when it was new. It was not starting easily before because the carb was full of junk. It won't start right now because it has no spark. So i will have to trace the electrical problem it has right now. It is probably a loose wire somewhere as it was running and now it has no spark.

Sounds like the carb is Flooding over!!!!!!!!!!if the plug is black that = to much gas,you sure you dont have the choke on????, I had one and the idle jet worked loose!!!! that flooded it real fast,or maybe the float is bad,some of them are plastic,they can get a hole in them,if so,they will not shut the fuel off.the valves can be to tite and it will-not affect the fuel problem!!!!,I just loosen them till I can feel it wiggle a-little bit,maybe 2TH's and it should run OK.6TH's is way to much.Also the ones I have delt with will not start if you have the thottle open!!!!!!!!!!! Why??? I don't know!!!!!!!!!!!.My grandson has a 125cc motor>Lifan,and it has to be started at a idle,with the Electric starter.I have a couple 140cc Lifan's on a couple old Honda CT90's and they are hard to Kick over,lot's of compression+they wont start with the thottle opened either.Another thing to check is the needle valve that let's the gas into the Carby,if there's trash in it!!! That will cause it to flood.Hope this help's,Latter.

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eddieo51

I didn't see the part about no Spark!!!!!!!! I have had the CDI boxe's go bad,just that fast!!!! Good Luck.Latter.

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eddieo51

Is there anyway to test a CDI?