New 49cc no start problem - PocketBikeForum.com

97slowbird · 04-02-2007, 09:01 AM

I just bought the bike (49cc dirt bike) and it ran with the first pull. Rode it and it would never rev up like my friends bike (same kind), only like half way. Then last night (day 2) it died twice while riding and wouldn't restart. Long story short, there's no fuel getting to the spark plug. We swapped carbs with a known good one and still nothing. Good spark, fuel to the carb, etc, but nothing is getting to the plug. Any clue ??

*Sleeves* · 04-02-2007, 09:48 AM

I wounder if the spacing between the flywheel and ignition coil is to big !
Try adjusting that, the gap should be the thickness of a business card .

97slowbird · 04-02-2007, 10:06 AM

I checked that and it's good ... the problem doesn't appear to be spark though. It's no fuel to the plug. Regardless how much I try to flood it, the spark plug stays dry. I'm starting to think of the reed possibly being bad. Thanks for the response.

*Sleeves* · 04-02-2007, 10:21 AM

Was the carb you switched to not in use for a while?

97slowbird · 04-02-2007, 10:24 AM

Brand new ... in fact, it was still warm from the other bike we pulled it off of. This thing is killing me. :)

97slowbird · 04-02-2007, 12:47 PM

Is it possible for the case gasket to be loose and not allowing the suction of the gas through the crankcase ??

*Sleeves* · 04-02-2007, 01:04 PM

It could be ! tear it apart and use new gaskets !I personally do not think it is that but try it , process of elimination !

huckster · 04-02-2007, 04:00 PM

liike sleeves , good place to start. its not pulling the fuel in for a reason. sticky reed might be a problem, never seen it before. leaking crank bearings also. !!

suicidal_rider · 04-02-2007, 05:32 PM

actualy i just finished fixing a bike that would start because the reed gaskets were broken, and in parts, replaced those and started like a champ!

97slowbird · 04-03-2007, 02:43 AM

Thanks for the help guys, I'll keep you posted as to what happens. One other question, since these are cheap China bikes that we bought, should we just start replacing parts with quality ones to prevent future down time ?? If so, where's a good place to get parts ?? Thanks again for your help.

04-02-2007, 09:01 AM	#1 (permalink)
97slowbird Pocketbike Beginner Join Date: Apr 2007 My Gallery Real Name: Rod Pocketbikes Owned: 1 Posts: 11	New 49cc no start problem I just bought the bike (49cc dirt bike) and it ran with the first pull. Rode it and it would never rev up like my friends bike (same kind), only like half way. Then last night (day 2) it died twice while riding and wouldn't restart. Long story short, there's no fuel getting to the spark plug. We swapped carbs with a known good one and still nothing. Good spark, fuel to the carb, etc, but nothing is getting to the plug. Any clue ??

04-02-2007, 09:48 AM	#2 (permalink)
Sleeves Pocketbike Dealer Join Date: Oct 2005 My Gallery Real Name: ??? Pocketbikes Owned: 2 Location: winnipeg Posts: 2,568	I wounder if the spacing between the flywheel and ignition coil is to big ! Try adjusting that, the gap should be the thickness of a business card . __________________ RCMRRA OWNER 06' P1 BMS competition BZM 15.5hp Open 50cc 05' DM Telai - ZPF 18 h.p Open 50cc 07' Pitsterpro 125cc 08' CBR125r 96' Gsx-r 600

04-02-2007, 10:21 AM	#4 (permalink)
Sleeves Pocketbike Dealer Join Date: Oct 2005 My Gallery Real Name: ??? Pocketbikes Owned: 2 Location: winnipeg Posts: 2,568	Was the carb you switched to not in use for a while? __________________ RCMRRA OWNER 06' P1 BMS competition BZM 15.5hp Open 50cc 05' DM Telai - ZPF 18 h.p Open 50cc 07' Pitsterpro 125cc 08' CBR125r 96' Gsx-r 600

04-02-2007, 01:04 PM	#7 (permalink)
Sleeves Pocketbike Dealer Join Date: Oct 2005 My Gallery Real Name: ??? Pocketbikes Owned: 2 Location: winnipeg Posts: 2,568	It could be ! tear it apart and use new gaskets !I personally do not think it is that but try it , process of elimination ! __________________ RCMRRA OWNER 06' P1 BMS competition BZM 15.5hp Open 50cc 05' DM Telai - ZPF 18 h.p Open 50cc 07' Pitsterpro 125cc 08' CBR125r 96' Gsx-r 600

04-02-2007, 04:00 PM	#8 (permalink)
huckster Pocketbike Lord Join Date: Sep 2005 My Gallery Location: wpg Posts: 928	liike sleeves , good place to start. its not pulling the fuel in for a reason. sticky reed might be a problem, never seen it before. leaking crank bearings also. !! __________________ employed and past owner of rivercity. givver sleeves

04-02-2007, 10:06 AM	#3 (permalink)
97slowbird Pocketbike Beginner Join Date: Apr 2007 My Gallery Real Name: Rod Pocketbikes Owned: 1 Posts: 11	I checked that and it's good ... the problem doesn't appear to be spark though. It's no fuel to the plug. Regardless how much I try to flood it, the spark plug stays dry. I'm starting to think of the reed possibly being bad. Thanks for the response.

04-02-2007, 10:24 AM	#5 (permalink)
97slowbird Pocketbike Beginner Join Date: Apr 2007 My Gallery Real Name: Rod Pocketbikes Owned: 1 Posts: 11	Brand new ... in fact, it was still warm from the other bike we pulled it off of. This thing is killing me. :)

04-02-2007, 12:47 PM	#6 (permalink)
97slowbird Pocketbike Beginner Join Date: Apr 2007 My Gallery Real Name: Rod Pocketbikes Owned: 1 Posts: 11	Is it possible for the case gasket to be loose and not allowing the suction of the gas through the crankcase ??

04-02-2007, 05:32 PM	#9 (permalink)
suicidal_rider Pocketbike Lord Join Date: Apr 2006 My Gallery Real Name: Jared Frizell Pocketbikes Owned: 4 Location: winnipeg, manitoba Posts: 729	actualy i just finished fixing a bike that would start because the reed gaskets were broken, and in parts, replaced those and started like a champ! __________________ BigBone rider TeamRiverCity Rider Smra 40cc class winner I guess I had an overall finish of 3rd in the 40cc class(Pitster PRO) BUT ONLY CAUSE OF THE TEAM!

04-03-2007, 02:43 AM	#10 (permalink)
97slowbird Pocketbike Beginner Join Date: Apr 2007 My Gallery Real Name: Rod Pocketbikes Owned: 1 Posts: 11	Thanks for the help guys, I'll keep you posted as to what happens. One other question, since these are cheap China bikes that we bought, should we just start replacing parts with quality ones to prevent future down time ?? If so, where's a good place to get parts ?? Thanks again for your help.

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