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Post by jjoshua20213 on Sept 13, 2013 4:43:57 GMT -5
Yes, same result Have you tried to connect fuel line directly to the tank, and leave the gas cap off? |
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Post by jjoshua20213 on Sept 13, 2013 4:49:53 GMT -5
4 valve head or scrappy's performance head? Wow you use an  MJ with a 24mm carb ? If the head is not ported and has larger valves plus a performance exhaust it is too big of a carb . Do you use the spacer ? I used a  MJ on my 50mm BBh stock carb . Your not creating enough vacuum to utilize a 24mm carb . Sure a size up carb or MJ makes one run better but too big it will not perform as good . Example a buddy had a Gran Torino with a 351 Cleveland that had a 2 barrel carb . He bought and Edelbrock 4BL intake and a Holley 650 double pumper on a stock engine . If he had the heads worked , performance cam and exhaust yes it may have worked great . It made more vacuum sound that it performed . I got it to take it back and get a 600 CFM Edelebrock carb that I bolted on out of the box and it was amazingly way better for his set up . If you compare drinking with a straw vs a 1/2 inch piece of pipe you can see that bigger does not mean better all of the time Check out the head at the top of this page www.scrappydogscooters.com/139QMB_50cc_Performance.htmlYou can always go with EFI if you have the cabbage www.ecotrons.com |
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Post by sailracer on Sept 13, 2013 7:39:02 GMT -5
Yeah or even an 18mm will be fine. I thought we suggested for you not to get the 150cc one. When I first did my bbk, I used the stock carb with an jet,and it ran fine. I changed it out because the adjuster screw was blocked off. was the bike cutting out at wot before this? |
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Post by jjoshua20213 on Sept 13, 2013 8:20:44 GMT -5
I already had this one. The one I was going to buy was 26mm. I thought 50cc carbs went up to 25mm. And no the bike was not cutting out. Stock carb is epa and locked. I'm going to try the 20mm carb. If 39mm stock piston uses 18mm than 50mm should do fine with 20 right? Yeah or even an 18mm will be fine. I thought we suggested for you not to get the 150cc one. When I first did my bbk, I used the stock carb with an jet,and it ran fine. I changed it out because the adjuster screw was blocked off. was the bike cutting out at wot before this? |
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Post by sailracer on Sept 13, 2013 9:10:48 GMT -5
yeah, I got a 20 on mine with an jet and it runs like a raped ape  |
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Post by jjoshua20213 on Sept 13, 2013 9:38:41 GMT -5
Ebaying a good one now!
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Post by jjoshua20213 on Sept 13, 2013 9:39:04 GMT -5
Wait, where did you get yours from and for how much?
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Post by jjoshua20213 on Sept 13, 2013 10:17:23 GMT -5
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Post by jjoshua20213 on Sept 15, 2013 22:41:48 GMT -5
Don't let this thread die!
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Post by sailracer on Sept 16, 2013 7:28:58 GMT -5
That's entirely up to you. Wer'e waiting for results. Did you install the smaller carb?  |
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Freshman Rider
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Post by rae4180 on Sept 16, 2013 8:00:32 GMT -5
sounds like you just need o find th right air to gas mix.try puting a old sock or or something over the air filter or if you have the stock air box put that on give it a try.
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Post by jjoshua20213 on Sept 16, 2013 9:57:57 GMT -5
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Post by sailracer on Sept 16, 2013 10:22:51 GMT -5
So it's the one that's giving you problems? maybe it's defective. I thought you had a couple of different carbs.I have that same carb with a n85 jet
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Post by jjoshua20213 on Sept 16, 2013 10:44:34 GMT -5
Its every carb but stock that does that. I have 3 carbs total
1. stock
2. A 50cc carb not sure what size. Bought it about 7 months ago and could never get it adjusted properly with my other bike.
3. the 19mm i'm using now I bout less than 1 month ago.
The problem I was having on the other bike is identical to this one. Only when it cut out it would die or idle down. FOund out later that it was the fuel petcock leskng gas nto vacuum and making everything too ruch. After fixing the petcock the bike was having the same issue at this one. Both have 50mm bbk
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Post by sailracer on Sept 16, 2013 11:47:06 GMT -5
What kind of cdi do you have? if there is a wire on the kill switch terminal, try disconnecting it.I had a wire on mine. It went to a speed sensor,and the cdi cut out after 30MPH. Attachments:
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Have you tried to connect fuel line directly to the tank, and leave the gas cap off?
MJ with a 24mm carb ? If the head is not ported and has larger valves plus a performance exhaust it is too big of a carb . Do you use the spacer ? I used a 
MJ on my 50mm BBh stock carb . Your not creating enough vacuum to utilize a 24mm carb . Sure a size up carb or MJ makes one run better but too big it will not perform as good . Example a buddy had a Gran Torino with a 351 Cleveland that had a 2 barrel carb . He bought and Edelbrock 4BL intake and a Holley 650 double pumper on a stock engine . If he had the heads worked , performance cam and exhaust yes it may have worked great . It made more vacuum sound that it performed . I got it to take it back and get a 600 CFM Edelebrock carb that I bolted on out of the box and it was amazingly way better for his set up .
