New member with 49cc mini ATV - Pocket Bike Forum - Mini Bikes
 
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post #1 of 19 (permalink) Old 3 Weeks Ago Thread Starter
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New member with 49cc mini ATV

So just got a 49cc mini Chinese ATV from my friend, he said he didn't k ow much about it. To start with it's got a kill switch and key switch which I don't really trust that work so I've disconnected them. At the moment the wiring of the bike has got the lead that goes to the spark plug and 1 short wire that comes from the coil to an earth which is between between the pull start cover and engine case. The problem is I cant get a spark, I've tried 2 spark plugs and 2 coils, any help from you guys is really appreciated.
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post #2 of 19 (permalink) Old 3 Weeks Ago
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The short wire is for the killswitch, when you put it on the ground/frame/enginecase you will never get a spark.
The short cable must be insulated. If the engine is running and you keep the cable to ground, the engine must go out.

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post #3 of 19 (permalink) Old 3 Weeks Ago
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Re: New member with 49cc mini ATV

Youre still going to need a killswitch…

How do you plan on shutting it down?


The coil is self generating as the magnets pass the thongs...If you ground the tab youre essentially shorting the coil out..

Depending on how much you've tried depends on the amount of fuel built up in the J-band of the pipe which will foul out sparkplugs after you achieve spark so if you get a wet plug after seeing a spark you have a clue where to look.. .

Welcome to the site and Good Luck


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Last edited by CAM2; 3 Weeks Ago at 05:01 PM.
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post #4 of 19 (permalink) Old 3 Weeks Ago Thread Starter
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My thinking was that if I removed the kill switch and key switch I would remove any wiring that could be faulty, and just kill the engine by turning the fuel off. At the minute I've got the ht lead plugged into the spark plug how it should be, and the short wire earned to the frame? Where should the short wire go if I don't use a kill switch? Thank you
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post #5 of 19 (permalink) Old 3 Weeks Ago
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Re: New member with 49cc mini ATV

Quote:
Originally Posted by Tom Cliff View Post
My thinking was that if I removed the kill switch and key switch I would remove any wiring that could be faulty, and just kill the engine by turning the fuel off. At the minute I've got the ht lead plugged into the spark plug how it should be, and the short wire earned to the frame? Where should the short wire go if I don't use a kill switch? Thank you
You just simply tape it unconnected...The coil body is already grounded to the engine case with the mounting screws..

Running a carburetor dry to kill it isnt very healthy for the engine especially after a nice run.

Putting a tywrap on the sparkplug wire end and pulling the sparkplug cap off the plug would be a lot better

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Last edited by CAM2; 3 Weeks Ago at 05:22 PM.
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post #6 of 19 (permalink) Old 3 Weeks Ago Thread Starter
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So I don't a actually need to connect the short wire to anything that's on the coil? I only need the ht lead on the spark plug to create a spark? The tie wrap idea sounds good to me and nice and easy
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post #7 of 19 (permalink) Old 3 Weeks Ago
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Re: New member with 49cc mini ATV

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Originally Posted by Tom Cliff View Post
So I don't a actually need to connect the short wire to anything that's on the coil?I only need the ht lead on the spark plug to create a spark?
Yes exactly.............

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Last edited by CAM2; 3 Weeks Ago at 05:25 PM.
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post #8 of 19 (permalink) Old 3 Weeks Ago Thread Starter
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Do you think its possible that the coil and fly wheel are working properly but because I have earthed the coil to the frame its stopping It from sparking?
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post #9 of 19 (permalink) Old 3 Weeks Ago
Re: New member with 49cc mini ATV

If you don't want a key, that's fine. All my many bikes that have keys also have a red push button on the handle bars, like the CAM2 dia. There like 5 bucks online. I do not recommend running a 2 stroke dry, when it goes lean you have no engine lubrication. Also, my A2 Cags key is on the side, hard to reach if your butt covers it, lol. See the red button on the left side handle bar, right side in the photo, it clamps on.
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Last edited by EPR; 3 Weeks Ago at 05:32 PM.
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post #10 of 19 (permalink) Old 3 Weeks Ago
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Re: New member with 49cc mini ATV

Quote:
Originally Posted by Tom Cliff View Post
Do you think its possible that the coil and fly wheel are working properly but because I have earthed the coil to the frame its stopping It from sparking?
How long were you pulling the pullrope trying to start it up?

When you installed the coil did you install it tab facing out and set .020"sae airgap between the coil thongs and the magnets..?

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Last edited by CAM2; 3 Weeks Ago at 06:34 PM.
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post #11 of 19 (permalink) Old 3 Weeks Ago Thread Starter
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I used the business card trick to set the gap for the coil, I only gave it a few pulls with the spark plug out of the engine to check for spark before I then tried to actually start the quad. After work later I'm going to rewire in the kill switch and try again for spark taking into account the previous comments. Thanks
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post #12 of 19 (permalink) Old 3 Weeks Ago Thread Starter
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So following what you said I've now got a nice blue spark on the spark plug, fitted it back to the engine and put fresh fuel in but not even a splutter from the engine, I'm sure the plug is getting fuel, any help really appreciated.
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post #13 of 19 (permalink) Old 3 Weeks Ago
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Re: New member with 49cc mini ATV

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Originally Posted by Tom Cliff View Post
So following what you said I've now got a nice blue spark on the spark plug, fitted it back to the engine and put fresh fuel in but not even a splutter from the engine, I'm sure the plug is getting fuel, any help really appreciated.
Going back to the latter part of post #3..Sounds like you're now over-fuelled..

I kinda told ya in advance what to expect after getting spark....


Quote:
Depending on how much you've tried pullstarting depends on the amount of fuel built up in the J-bend of the exhaust pipe which will foul out sparkplugs after you achieve spark so if you get a wet plug after seeing a spark you have a clue where to look.. .
Im sure the friend who knew nothing about the bike just tugged the hell out of the pullrope way before you ever got it...The fuel might fume away but the unburnt oil will still remain in the j-bend...


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Last edited by CAM2; 3 Weeks Ago at 11:33 AM.
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post #14 of 19 (permalink) Old 3 Weeks Ago
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Re: New member with 49cc mini ATV

Quote:
Originally Posted by Tom Cliff View Post
I used the business card trick to set the gap for the coil, I only gave it a few pulls with the spark plug out of the engine to check for spark before I then tried to actually start the quad. After work later I'm going to rewire in the kill switch and try again for spark taking into account the previous comments. Thanks
Ok..So was this business card a legitimate oldschool .020 - .025"" thick business card or was it a newer turbo jet style business card thats only .0125 - .015" thick?

I use a 1/2" wide cutoff from one of my old plastic Hagerty classic car insurance identification card that's .023" thick.....

The reason I know its .023" thick is because I used my digital caliper and measured its thickness.

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Last edited by CAM2; 3 Weeks Ago at 11:31 AM.
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post #15 of 19 (permalink) Old 3 Weeks Ago Thread Starter
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Just stripped the carb and cleaned with hot soapy water, the quad is now running and starts pretty easy, only problem now is that it runs with wheels in the air but dies when it's on the floor, thinking clutch maybe?
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post #16 of 19 (permalink) Old 3 Weeks Ago
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Re: New member with 49cc mini ATV

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Originally Posted by Tom Cliff View Post
Just stripped the carb and cleaned with hot soapy water, the quad is now running and starts pretty easy, only problem now is that it runs with wheels in the air but dies when it's on the floor, thinking clutch maybe?
Absolutely.........pull it apart and deoxidize and de-rust everything and reassemble without the waxy washers...use loctite too...Don't overtighten the screws either or they'll shear off.Theyre designed to...

If you want to add a lil extra uumph on takeoff crossdrill the clutch pad shoes to lighten them a lil...

deglaze the clutchpads and clutchbell with 100grit emerypaper

Id also service the clutchbell bearing and the chain..

Nice job getting it running..

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Last edited by CAM2; 3 Weeks Ago at 12:00 PM.
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post #17 of 19 (permalink) Old 3 Weeks Ago
Re: New member with 49cc mini ATV

You can balance your clutch arms also while your lightening the clutch.
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File Type: jpg HP Cag Clutch.jpg (368.3 KB, 4 views)

Empty Pockets Racing: The difficult we do, the impossible takes longer.....

Last edited by EPR; 3 Weeks Ago at 12:14 PM.
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post #18 of 19 (permalink) Old 2 Weeks Ago Thread Starter
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Thanks for all the help, wont be long until my lad can ride his quad, just a couple more jobs to do. One of them being punctures on 2 tyres, I've removed the wheels but can not get the tyres off to repair the inner tubes, tried leavening them off but they're too tight and strong, am I missing something simple?
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post #19 of 19 (permalink) Old 2 Weeks Ago
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Re: New member with 49cc mini ATV

Quote:
Originally Posted by Tom Cliff View Post
Thanks for all the help, wont be long until my lad can ride his quad, just a couple more jobs to do. One of them being punctures on 2 tyres, I've removed the wheels but can not get the tyres off to repair the inner tubes, tried leavening them off but they're too tight and strong, am I missing something simple?
Yes indeed...The rims should be a 2 piece design.............

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Last edited by CAM2; 2 Weeks Ago at 10:19 PM.
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