DB30 Carburetor Problems - Pocket Bike Forum - Mini Bikes
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post #1 of 12 (permalink) Old 4 Weeks Ago Thread Starter
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DB30 Carburetor Problems

Okay, I was given a Doodle Bug DB30 mini-bike a couple of weeks ago. Not in the best shape, but not bad enough to trash. I have done some cleaning on it, checked it for spark (had none) and compression. Spark is now a nice blue white since I cleaned the flywheel surface rust and the coil contacts and set the gap. I pulled on the crank rope and the spring turned loose as the rope snapped. I got the spring rewound and a new rope in it and sprayed some ether in the carb and got.....nothing. I took the carb apart and cleaned it thoroughly and put it back together and tried it. Once again, nothing. I remove the carb and spray starting fluid into the intake and it runs. Put the carb on, use ether and NOTHING. I bought a new carb off Amazon and it won't hit a lick with with the new carb either. Remove carb, spray the intake and it runs fine. Put the carb on it and it won't even fart one time. I'm about to throw it into a dumpster and cut my losses. All I can figure it the new carb is either no good or so far out of adjustment, it just doesn't work. Any of you guys have any suggestions or maybe know how to set the carburetor up so it'll start and I can dial in the proper adjustments? If not, I may try to figure out how to put the 6 hp Honda pressure washer motor off a gifted pressure washer on it and make it go FAST! I'm 63 years old and probably don't need to be making it fast with just one little disc brake on it that's hand operated!!

I'm a ghost driving a meat coated skeleton made from stardust! What do I have to be afraid of?
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post #2 of 12 (permalink) Old 4 Weeks Ago
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Re: DB30 Carburetor Problems

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Originally Posted by Chuzz View Post
Okay, I was given a Doodle Bug DB30 mini-bike a couple of weeks ago. Not in the best shape, but not bad enough to trash. I have done some cleaning on it, checked it for spark (had none) and compression. Spark is now a nice blue white since I cleaned the flywheel surface rust and the coil contacts and set the gap. I pulled on the crank rope and the spring turned loose as the rope snapped. I got the spring rewound and a new rope in it and sprayed some ether in the carb and got.....nothing. I took the carb apart and cleaned it thoroughly and put it back together and tried it. Once again, nothing. I remove the carb and spray starting fluid into the intake and it runs. Put the carb on, use ether and NOTHING. I bought a new carb off Amazon and it won't hit a lick with with the new carb either. Remove carb, spray the intake and it runs fine. Put the carb on it and it won't even fart one time. I'm about to throw it into a dumpster and cut my losses. All I can figure it the new carb is either no good or so far out of adjustment, it just doesn't work. Any of you guys have any suggestions or maybe know how to set the carburetor up so it'll start and I can dial in the proper adjustments? If not, I may try to figure out how to put the 6 hp Honda pressure washer motor off a gifted pressure washer on it and make it go FAST! I'm 63 years old and probably don't need to be making it fast with just one little disc brake on it that's hand operated!!
Welcome to the forum....All of these have only 1 brake each and cruise above 50mph;-2 of them on methanol/alky mix and 2 on e-85 so you're fine with what you have....LOL






Try to replace the sparkplug....Those carbs come pre-jetted for the engine...Its when you remove the governor and increase the revs is when you have to worry about dialing in the carb..


If you got no fire on fuel after cleaning up the flywheel buy a new coil...Theyre cheap and go bad pretty often these days..

https://www.amazon.com/Ignition-Baja.../dp/B01N45BGVP

Good Luck

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Last edited by CAM2; 4 Weeks Ago at 07:22 AM.
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post #3 of 12 (permalink) Old 4 Weeks Ago Thread Starter
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Re: DB30 Carburetor Problems

Thanks for the replies, gents. It has PLENTY of fire. It also has a new Champion spark plug that is firing intensely when I crank it and ground the plug. I haven't fooled with the governor at all. It just makes NO SENSE to me that it won't even pop with either the old or new carb. I love the copper colored chopper style on your bike, CAM2. That is sweet!

I'm a ghost driving a meat coated skeleton made from stardust! What do I have to be afraid of?

Last edited by Chuzz; 4 Weeks Ago at 07:58 AM.
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post #4 of 12 (permalink) Old 4 Weeks Ago Thread Starter
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Re: DB30 Carburetor Problems

So does anyone know the proper starting point for this 97 cc pain in the neck carburetor? I'm thinking of turning the air screw all the way in, along with the governor/throttle adjustment and then backing the air screw out 2 full turns to see what happens. If nothing, then I'll try 1 turn and then go to 3, then 4 or 5 and see if it'll hit. If not, I'm going to contact the seller and see if they'll send me another carb and take this one back. I've even thought about maybe switching the jets and needle valve and float from the old one into the new one. What say you guys? Good idea or don't do it?

I'm a ghost driving a meat coated skeleton made from stardust! What do I have to be afraid of?
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post #5 of 12 (permalink) Old 4 Weeks Ago
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try this first https://youtu.be/dDHAjH_gofI

you can get a brand new carb off ebay for 10$ if you think gasoline has been left in it for a long time then you might think about replacing it

https://www.ebay.com/p/Carbhhub-Carb...xoCmXAQAvD_BwE

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post #6 of 12 (permalink) Old 4 Weeks Ago
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Re: DB30 Carburetor Problems

Quote:
Originally Posted by Chuzz View Post
Thanks for the replies, gents. It has PLENTY of fire. It also has a new Champion spark plug that is firing intensely when I crank it and ground the plug. I haven't fooled with the governor at all. It just makes NO SENSE to me that it won't even pop with either the old or new carb. I love the copper colored chopper style on your bike, CAM2. That is sweet!
Starting fluid isnt the same as regular fuel and just about any type of spark will fire starting fluid unless you use too much.....Gas has a higher stoitchometric rating than starting fluid too...

Try putting gas down the sparkplug hole to see if you get a reaction like the starting fluid.....

If the spark is strong enough under pressure the engine will fire....If it doesnt fire then theres a problem with your coil or compression....

I hve a whole box of coils from various types of engines that give killer spark but wont fire the engine....In case you didnt know coils have a shelf life aswell as a service life......The amount of time on them before needing a replacement on a 4 stroke engine is around 5 years...Anytime after 5 years and your operating on borrowed time..........

The only other thing you can do is give it a compression test to see if it falls within specs......

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Last edited by CAM2; 4 Weeks Ago at 12:13 PM.
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post #7 of 12 (permalink) Old 3 Weeks Ago Thread Starter
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Re: DB30 Carburetor Problems

No need to put gas in the cylinder. I figured out the new carb is no good. I actually got it running yesterday by using part of the original carb with parts out of the new one. I can't get it to idle very good, but a new carb is on the way. I bought the first one off Amazon and am returning it as defective and HOPE the replacement works. I appreciate all of the input from you guys and will let you know when the new carb arrives if it's any better than the first one. If not, I'll probably try using parts out of it in the old one and see what I can do. I WILL NOT let this thing beat me. I need to ride this mini bike!

I'm a ghost driving a meat coated skeleton made from stardust! What do I have to be afraid of?
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post #8 of 12 (permalink) Old 3 Weeks Ago Thread Starter
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Re: DB30 Carburetor Problems

Got the new carb yesterday afternoon and when I looked it over before installing it, I noticed the air adjustment screw was just hanging in the hole. I had to turn it 7 full turns to get it to seat. Then I backed it out 2 turns and installed it. I filled it with gas and pulled the rope 5 times and it fired up! I had to adjust the carb just a little, but this engine sounds pretty good. NOW, I have a problem getting the throttle and governor to work together. I have had 2 brain surgeries in the past 15 years, so comprehension is not a good thing for me anymore. Can someone explain or post some pictures of how the throttle cable and governor should be connected so I can get this sucker to work? For the life of me, I can't figure it out. My cognitive thinking has not been the same since the first surgery in 2004. I was SUPPOSED to die, according to 7 different neurosurgeons, but GOD proved them wrong. I'm still crazy, but not as deductive as I used to be. Someone please help me with this, if you can. Thanks

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post #9 of 12 (permalink) Old 3 Weeks Ago
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use a zip tie to hold the governor open and keep it from flopping around.

Leaving the governor completely disconnected hook up the throttle cable directly to the carburetor...

Just be mindful of engine RPM while you're riding it... and enjoy.
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post #10 of 12 (permalink) Old 3 Weeks Ago
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Re: DB30 Carburetor Problems

Seeings you have trouble with schematics and comprehending instructions maybe a vid will do....




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Last edited by CAM2; 3 Weeks Ago at 10:06 AM.
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post #11 of 12 (permalink) Old 3 Weeks Ago Thread Starter
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Re: DB30 Carburetor Problems

Thank you for the videos, CAM2. I appreciate those. I've already seen the 3rd one and my throttle is NOTHING like the one in the 2nd. I was hoping the guy in the 1st one would show how the springs were connected after the carburetor replacement, but he let me down!

I'm a ghost driving a meat coated skeleton made from stardust! What do I have to be afraid of?
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Re: DB30 Carburetor Problems

I want to thank all of you guys for helping. I have it running and rode it today. I found another forum for old mini bikes and am posting there too. It's more mini bike oriented and not so much on the pocket bikes. I feel I have the best of both worlds now. Where's Sammy Hagar?

I'm a ghost driving a meat coated skeleton made from stardust! What do I have to be afraid of?
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