Need Help Identifing Dirt Bike - Pocket Bike Forum - Mini Bikes
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post #1 of 25 (permalink) Old 06-12-2018 Thread Starter
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Need Help Identifing Dirt Bike

Hey everyone I just bought this smaller dirt bike, but I am not able to figure out the type of engine that is on it without taking it apart.


If anyone has experience with these types that would be much appreciated!


Thank you in advance!
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post #2 of 25 (permalink) Old 06-12-2018 Thread Starter
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Re: Need Help Identifing Dirt Bike

More photos up close of the engine.
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post #3 of 25 (permalink) Old 06-13-2018
Re: Need Help Identifing Dirt Bike

That bike has many names and numbers, QC 50 mini dirt bike is one. It's a 49cc reed port 2 stroke clone copy of a Blata 2.6 mini moto engine, 44mm bore & 32mm stroke. Can you find any numbers on the frame?? I have many bikes with that engine. To find parts on eBay, search,

49cc two stroke mini dirt bike parts, and see what shows up. There are also online stores that sell parts, pocketbikeparts and scooterparts4less on the .com

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post #4 of 25 (permalink) Old 06-13-2018 Thread Starter
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Re: Need Help Identifing Dirt Bike

Great! Thank you for the quick response!


I will try to clean up and look tomorrow.


From what I'm seeing from googling you are exactly right! According to a website it says mixture 25:1. I may be wrong but I thought most of these used the 50:1 ratio?


After cleanup I will see if I can provide more information and photos!
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post #5 of 25 (permalink) Old 06-13-2018
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Re: Need Help Identifing Dirt Bike

40:1 It's the dirt bike with the cag engine
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post #6 of 25 (permalink) Old 06-18-2018 Thread Starter
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Re: Need Help Identifing Dirt Bike

Here are the only numbers/symbols I could find on the whole frame/engine.

*I tried to add photos but they are not showing up when I add them even though they are smaller than 512KB

I also cleaned the carb and put in fresh gas and it starting and reved up but the clutch was not engaging. I took that apart and the clutch pads/shoes were smooth and I read a post where CAM2 said to sand them down to be rough with 80 git sandpaper. Would that help?

Last edited by BM120; 06-18-2018 at 12:45 AM.
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post #7 of 25 (permalink) Old 06-18-2018
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Re: Need Help Identifing Dirt Bike

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Originally Posted by BM120 View Post
Here are the only numbers/symbols I could find on the whole frame/engine.

*I tried to add photos but they are not showing up when I add them even though they are smaller than 512KB

I also cleaned the carb and put in fresh gas and it starting and reved up but the clutch was not engaging. I took that apart and the clutch pads/shoes were smooth and I read a post where CAM2 said to sand them down to be rough with 80 git sandpaper. Would that help?
You need to make sure the arms swing free and snap back quick....

Deglazing the clutchpads isn't a bad idea just make sure the clutch is pressed on the crank tightly and if it has a reduction transmission make sure it's operating correctly by spinning the bell and seeing if the output reacts...

GOOD LUCK

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post #8 of 25 (permalink) Old 06-18-2018 Thread Starter
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Re: Need Help Identifing Dirt Bike

The bell isn't with any damage and no scoring inside, nice and smooth. My clutch is a 3-shoe clutch. I'm guessing if I do replace it would it have to be another 3-shoe or could it be a 2-shoe?

Also is there a thread I can read that shows how to adjust the arms properly?

Thanks!
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post #9 of 25 (permalink) Old 06-18-2018
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Re: Need Help Identifing Dirt Bike

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The bell isn't with any damage and no scoring inside, nice and smooth. My clutch is a 3-shoe clutch. I'm guessing if I do replace it would it have to be another 3-shoe or could it be a 2-shoe?

Also is there a thread I can read that shows how to adjust the arms properly?

Thanks!
Are you sure the clutch is pressed onto the crank good...Theres clutches without a keyway slot and you can have that clutch and it could be loose....

Theres no dedicated thread on the clutches..Theyre kinda melded into threads

The rule of thumb is to take a screwdriver and try to pry the arms outwards then see if they snap back quickly..

The Dis-similar metals between the steel shoulder bolts aswell as the aluminum and magnesium cause alot of oxidation between the two...

Remove all the arms..throw away the 3 wavy washers,,clean up the shoulder bolts of any rust aswell as deoxidize the arm pivot holes then use a lil antisieze compound on the screws whenyou reassemble......

Also make sure the clutch arma are on the right way....Its easy to put the arms on wrong............

Posting pics of what youre working with tells alot more than you know........

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Last edited by CAM2; 06-18-2018 at 07:24 PM.
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post #10 of 25 (permalink) Old 06-21-2018 Thread Starter
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Re: Need Help Identifing Dirt Bike

Here are some photos of the housing and clutch

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Re: Need Help Identifing Dirt Bike

Thanks for posting the pics.....


You have the 7:1 reduction transmission....Try taking the cover off to see of the chain is still hooked up to the chain gears and that the chain or gears arent busted

As far as the clutch it looks like you may have a sticking clutch arm issue....

The clutch itself looks like its got a huge abundance of epoxy holding it to the crank so its safe to say its not loose.........

Remove the 3 springs and the 3 screws,,clean up the shoulder bolts and the holes,,use a lil antiseize and chuck the wavy washers in the trashbin.....

On your question on whether you can use a 2 shoe clutch...You can if you buy the right one....

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Last edited by CAM2; 06-21-2018 at 06:28 PM.
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With all that epoxy on there your going to want to use the proper puller if your going to remove the clutch arm mount off the crank you can get a new clutch and just replace the arms but that clutch has some good life in it still

The 2 shoe raceing clutch is a short life clutch just so you know

Like CAM2 is saying the arms are more then likely stuck take the springs off and work the arms if they feal at all sticky do what CAM2 has posted

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Re: Need Help Identifing Dirt Bike

I would take the arms off just to check everything. If and when you do remove the whole clutch look for a key slot in the crank where the clutch goes, and if so buy a slotted clutch and woodruff key.

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post #14 of 25 (permalink) Old 06-28-2018 Thread Starter
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Re: Need Help Identifing Dirt Bike

Here is more photos of the clutch And transmission

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Re: Need Help Identifing Dirt Bike

Looks like somebody got epoxy crazy......LOL

Reassembl the clutch arms without the wavy washers.......It would also be a good time to weight match all the clutch arms ...........

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post #16 of 25 (permalink) Old 06-28-2018 Thread Starter
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Re: Need Help Identifing Dirt Bike

Should I remove all that epoxy when I replace the clutch? Would I need to use something to attach the next clutch?
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Re: Need Help Identifing Dirt Bike

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Should I remove all that epoxy when I replace the clutch? Would I need to use something to attach the next clutch?
Nah its not a bother for reassembly....The clutch you have has plenty of pad to it...

When you tighten the screws and before you add the springs make sure the arms swing freely.......If they dont use a file to finetune the mount width,,,,,,,,

remember to throw the wavy washers in the trash,,,Theyre more trouble than help....

Good luck

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post #18 of 25 (permalink) Old 06-28-2018 Thread Starter
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Re: Need Help Identifing Dirt Bike

If I replace the springs with hp springs, where would I find those?
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Re: Need Help Identifing Dirt Bike

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Originally Posted by BM120 View Post
Hey everyone I just bought this smaller dirt bike, but I am not able to figure out the type of engine that is on it without taking it apart.


If anyone has experience with these types that would be much appreciated!


Thank you in advance!
its the 49cc Cag reed inducted engine
90% of the time the jet in the carby gets clogged clean it out and install a new fuel filter

Faster then a speeding E Revo
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Re: Need Help Identifing Dirt Bike

Leave that epoxy piece on, don't think it is going to spin on the crank. When you buy a new clutch take the arms off the new one and put it on the piece that's there. Look on ebay for racing springs: 49cc 2 stroke mini dirt bike parts. The come in 8, 9 & 10 gauge wire. The 10s work better on steel arm clutches, 8 and 9 for alum clutches.

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