pull start problem 50cc dirt bike - Pocket Bike Forum - Mini Bikes
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post #1 of 23 (permalink) Old 10-16-2009 Thread Starter
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pull start problem 50cc dirt bike

hi i have a 50cc giovanni mini dirt bike i ran it for a bit and put the bike away. An hour later i tried to start it up but the pull start is really hard to pull. There is so much resistance in it when i pull it it lifts the bike off the ground.
Help please
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post #2 of 23 (permalink) Old 10-16-2009
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Re: pull start problem 50cc dirt bike

THAT does not sound good.

Pull out the plug and look at it. What color is the plug?
-White / grey - too lean (not enough fuel - VERY bad)
-Pitch black / dark brown - too rich (too much fuel - better, not great)
-Caramel / golden brown - just about right ...

Remember: it is always better to run your bike a little too rich than a little too lean. Too richwill simply foul the plug more often, resulting in more frequent cleanings. Too lean has the potential to blow/seize the engine.

I'm going to ask what may sound like a dumb question, but you DID mix oil in with the gas, correct?

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post #3 of 23 (permalink) Old 10-16-2009 Thread Starter
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Re: pull start problem 50cc dirt bike

yes i did mix the oil with the gas its a new bike so its a 1:25 ratio
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post #4 of 23 (permalink) Old 10-16-2009 Thread Starter
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Re: pull start problem 50cc dirt bike

i pulled the plug out and its black
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post #5 of 23 (permalink) Old 10-16-2009
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Re: pull start problem 50cc dirt bike

Okay, good ..... at least that's okay ...

Hmmm .... Try taking off the pullstart, and looking to see if the coil has slipped down. You should be able to rotate the flywheel by hand, so see if there are any skidmarks or scrapes on it. The airgap between the flywheel and the coil should be the thickness of a standard business card. If not, reset by loosening the coil bolts, slip a business card down between the two, push the coil snug against the card, and retighten the bolts. Remove the card by rotating the flywheel.

Now, if that's not the case, you may need to pull the head off the bike to check the piston and rings. Hopefully, it won't come to that, but be prepared to do so, just in case. It may be the flywheel / coil airgap, which is a fairly easy fix.

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post #6 of 23 (permalink) Old 10-17-2009 Thread Starter
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Re: pull start problem 50cc dirt bike

ye i can rotate the flywheel by hand what are these coils your talking about
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post #7 of 23 (permalink) Old 10-17-2009
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Re: pull start problem 50cc dirt bike

Coil is in front of the flywheel ... the black box that the spark plug wire comes off. Some people call 'em magnetos, too ....

You can rotate the flywheel by hand, but not with the pullstart? Sounds like the pulstart may be messed up, then.

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post #8 of 23 (permalink) Old 10-18-2009 Thread Starter
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Re: pull start problem 50cc dirt bike

could it be the spark plug
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post #9 of 23 (permalink) Old 10-19-2009
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Re: pull start problem 50cc dirt bike

Shouldn't be, but couldn't hurt to clean the plug. might also want to check and see if the gap is correct on the plug ... I think .020" is correct, don't quote me on that ....

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Re: pull start problem 50cc dirt bike

I Have The Slight Same Prolbem.
Basicly I Bought A Dirt Bike. 50cc Not Sure If Its A Scrambler, But The Pull Start Was Wrong And The Bolt Kept Getting In To The Flywheel. So I Took Off The Front To see The Fly Wheel.
And Theres A Screw That Has Been Cut Off And Stuck. Yet Its A Tuffy To Get Out. And I Wish To Get The Same Pull Start For The Flywheel But.
The One It Came With Is Like The String And The Vents And The Case Is Where You Bolt It On.

Please Give Advice. As Im A Newbie.
Thanks.
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Re: pull start problem 50cc dirt bike

Pictures would help .... welcome to the forums.

Upload pictures to PhotoBucket, copy and paste the links here.

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Re: pull start problem 50cc dirt bike

Thanks,
Il Try To Get Them As Soon As Possible.
But I Got A New Prolbem.

I Got A Engine Off A Mini Moto Perfectly Fine.
Put It Into The Dirt Bike And Still Wont Go.

New Spark Plug
New Carb
New Fuel Filter
New Pull Start
Altho The Piston Head On The Orginal Engine Was Like Charcoal And Burnt Like. But Not Sure If That Was The Prolbem.
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Re: pull start problem 50cc dirt bike

Heres The Bike Its Self.

49cc Mini Dirt Bike - Yellow - Mini Dirt Bikes

As Far As I know From The Buyer It Was Left For 2 Months.

Cleaned Everything.

But The Ignition Dident Seem Wired Out. And Looked Like The Prolbem Altho We Tried To Wire It Up.
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Re: pull start problem 50cc dirt bike

see if you can get it to start by giving it a little bit of throttle at the same time as pulling the pullstart.
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Re: pull start problem 50cc dirt bike

Yes, We Tried That At The Same Time To,
Although Bike Has A Key Barrel And The Wires Dont Seemed Wired up We Cant Understand Why It Wont Start Up.
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Re: pull start problem 50cc dirt bike

Hi Again, New Prolbem For Some Strange Reason The Gearbox Or BellHousing Makes A Really Loud Noise When The Tyre Moves, And When Certin Bolts Are Screwed In It Would Sieze The Wheel. But The Flywheel is Still Able To Move And The Clutch.
Please Help
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Re: pull start problem 50cc dirt bike

Pull the clutch housing off and look inside, you may have a broken spring in there.

The bolts screwed in and seizing the wheel sounds like you have bolts that are too long for what they're being used for.

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Re: pull start problem 50cc dirt bike

I'm new to this but I have a similar problem I was riding my bike for about a hour cut it off for about 15 mins then cut it back on and the engine sounded so rough running then after about 10 mins tried cutting it back on and the free wheel kept getting stuck. Took the pull start off and it works fine but I looked in the free wheel keeps getting caught on something. HELP PLEASE ANYONE
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Re: pull start problem 50cc dirt bike

Quote:
Originally Posted by Tupac long View Post
I'm new to this but I have a similar problem I was riding my bike for about a hour cut it off for about 15 mins then cut it back on and the engine sounded so rough running then after about 10 mins tried cutting it back on and the free wheel kept getting stuck. Took the pull start off and it works fine but I looked in the free wheel keeps getting caught on something. HELP PLEASE ANYONE

take your trans or bellhousing off amd inspect your clutch...it sounds like you have a busted clutch spring or delaminated pad...........good luck
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Re: pull start problem 50cc dirt bike

I think it might be the clutch cause before I noticed when I stopped and tried to throttle the bike wouldn't move then I would sit there for about a min or two and it would start going again. Now I can't even pull start it
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