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Post by sw6456 on Mar 14, 2018 16:58:39 GMT -5
I have a 2012 ATM-50A1 that I got from my dad because he didn’t use it and I got it a while back and replaced the spark plug, fuel & vacuum lines (since some of the original chinese ones dried out from it sitting at my dads I went ahead and replaced all of them), put a 20 mm carb on there with a cone filter and it’s an actual 20mm I checked the butterfly valve. I put everything together and I forgot to order extra jets and tried to mess with the jets and get it to run for a little until I got the new jets and I never could get it to idle and it’d die at WOT. I figured I’d need to replace the main jet with a different size, and other stuff happened in life and that was my little side project so I had to put that on hold for a little bit. So now, I’m about start working on it again and I was wondering what y’all think I should do, because I want to do a BBK but don’t know what a good place to get one would be that’s not gonna crap out faster than they already do. obviously money’s not that much of an issue seeing as how most of it’s cheap as hell compared to a project car IMO but I would like to know what it would run to get everything that I need for a good BBK setup. I do need to get a new exhaust too because the one on mine is junk.
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Post by jackrides on Mar 14, 2018 19:00:37 GMT -5
Parts for Scooters is reliable. Reading suggests that 44mm or 47mm are the best BBK sizes. You'll need some main jets. Check out the Scoot FAQ For a lot more info.
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Post by GrumpyUnk on Mar 14, 2018 22:28:56 GMT -5
I would be checking the fuel system from the bottom of the fuel tank to the inlet to the carburetor. You have a tank outlet fitting, with a tube up into the tank that has screens built in. The outlet fitting may have a vacuum operated petcock, or just a fitting and vacuum operated petcock further down towards the filter, then a filter, then the carb inlet. The above parts could be restricting fuel flow, causing the WOT problem. The float could be sticking, but generally they stick so there's a mess with fuel flowing until it falls out the air filter box... but you don't have one, so fuel would flow onto the top of the crankcase if the float stuck 'open'. When you replaced the carburetor, was the old one full of fuel that had turned to muck? That might indicate what you could find in the fuel tank. Check fuel flow as was suggested, and make sure the vacuum valve works by sucking on the line, AND make sure the vacuum line is tight and not folded to flatten it, as that will restrict the vacuum if it is flat, and cut fuel flow. tom
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Post by sw6456 on Mar 15, 2018 1:36:04 GMT -5
I would be checking the fuel system from the bottom of the fuel tank to the inlet to the carburetor. You have a tank outlet fitting, with a tube up into the tank that has screens built in. The outlet fitting may have a vacuum operated petcock, or just a fitting and vacuum operated petcock further down towards the filter, then a filter, then the carb inlet. The above parts could be restricting fuel flow, causing the WOT problem. The float could be sticking, but generally they stick so there's a mess with fuel flowing until it falls out the air filter box... but you don't have one, so fuel would flow onto the top of the crankcase if the float stuck 'open'. When you replaced the carburetor, was the old one full of fuel that had turned to muck? That might indicate what you could find in the fuel tank. Check fuel flow as was suggested, and make sure the vacuum valve works by sucking on the line, AND make sure the vacuum line is tight and not folded to flatten it, as that will restrict the vacuum if it is flat, and cut fuel flow. tom My bad I forgot to include that I actually had driven it with the stock carb after replacing all the lines, my dad didn’t leave it sitting so long it would’ve turned to muck for sure. it was fully drained of whatever little bit of gas was left and i’ve used premium gas only in it since. I did replace the in-line fuel filter and the petcock when I replaced the lines in it so I know there’s no flow issues going to the carb from the tank although I do know my gas float is broken on the inside of the tank but I don’t really know how to get it out of there, there are no parts missing off of it, it just isn’t reading on the dash. I don’t need it in the first place, never ran out of gas or was going far enough to run out of gas so I mean that could be a problem but I think the main jet in the carb is an 80 so I was thinking i’d need to get a 90 or something to compensate for the extra airflow because of the cone filter. A better description of what I am experiencing with the WOT problems is I have to rev it over and over until I get the engine to rev up a bit and then I can hold it at around 1/2 to 3/4 open throttle and it’ll stay running but if I push it further or try to idle, it dies out. also I forgot to add, I did replace the intake manifold at the time also when I did the lines and everything else.
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Post by sw6456 on Mar 15, 2018 1:38:06 GMT -5
also, thanks tom and jacks ride for the help and info
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Post by sw6456 on Mar 15, 2018 16:52:54 GMT -5
Well I took the carb out today in preparation for the jets I’m getting and took a look at the fuel tank, low and behold the float fell off of the metal arm on the gas float and was free in the tank. I took it out by poking it with a long bike spoke I had and pulling it through the top, so that’s out now. Do you think I should try and put my carb back on and fill it up and try running it since the float might have been the problem? or do I still need to re-jet my carb?
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Post by zummerp on Mar 15, 2018 17:16:41 GMT -5
Off topic, but can you easily replace the carb by removing the seat bucket on the ATM50-A1? On my Zummer I need to remove all the side panels to get at the wires and it’s a pain!
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Post by sw6456 on Mar 15, 2018 18:08:00 GMT -5
Off topic, but can you easily replace the carb by removing the seat bucket on the ATM50-A1? On my Zummer I need to remove all the side panels to get at the wires and it’s a pain! Yeah it’s that easy, you just take the 4 nuts out on the inside of the seat and pull it out and then you can easily get to the carb where the only wiring for it is the one connection coming off of the electric choke and it’s clipped in up by the fuel tank if you just follow the wire. There’s also the little center panel that would be behind your feet when you’re riding that you can take out to make a lot more room it’s just 2 screws under the floor mat and it clips into the side panels on both sides of it. I think it literally took me an hour to take mine out today, but that sounds like a pain to do on your Zummer because I hate the little clips that hold them together since they break so easy. Anyways though, hope that helped!
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Post by sw6456 on Mar 15, 2018 18:10:17 GMT -5
Also on a side note, if you want a video, step by step tear down basically of the scooter 90GTVert has a good series on this specific model on youtube if you search his name up on there
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Post by zummerp on Mar 15, 2018 19:17:32 GMT -5
Also on a side note, if you want a video, step by step tear down basically of the scooter 90GTVert has a good series on this specific model on youtube if you search his name up on there I’ve watched them all but his panels were all off when he did the carb work I’m installing a 20mm Keihin clone now and replacing the stock airbox with a 39mm pod filter. I installed a #96 main jet and a #38 pilot. Wish me luck!
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Post by sw6456 on Mar 15, 2018 20:18:10 GMT -5
Also on a side note, if you want a video, step by step tear down basically of the scooter 90GTVert has a good series on this specific model on youtube if you search his name up on there I’ve watched them all but his panels were all off when he did the carb work I’m installing a 20mm Keihin clone now and replacing the stock airbox with a 39mm pod filter. I installed a #96 main jet and a #38 pilot. Wish me luck! Let me know how that goes, I need to re-jet and wanna know what you find out 👍
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Post by zummerp on Mar 15, 2018 20:49:02 GMT -5
I found out that #38 appears too small based on early bogging between 0-1/4 throttle and #96 gave me slightly lower speeds than my #90 on my other GY6
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Post by sw6456 on Mar 15, 2018 21:14:54 GMT -5
I found out that #38 appears too small based on early bogging between 0-1/4 throttle and #96 gave me slightly lower speeds than my #90 on my other GY6 Okay, are you trying different jets now? or do you have to get more jets? and also, where’d you get your jets from?
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Post by zummerp on Mar 15, 2018 22:05:36 GMT -5
I found out that #38 appears too small based on early bogging between 0-1/4 throttle and #96 gave me slightly lower speeds than my #90 on my other GY6 Okay, are you trying different jets now? or do you have to get more jets? and also, where’d you get your jets from? Yep - I bought a 50 pack of jets on Amazon and I’m gonna try a smaller main and a bigger pilot. For tonight, I’m pouring a small glass of whiskey and going to bed though
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Post by sw6456 on Mar 15, 2018 22:11:23 GMT -5
Okay, are you trying different jets now? or do you have to get more jets? and also, where’d you get your jets from? Yep - I bought a 50 pack of jets on Amazon and I’m gonna try a smaller main and a bigger pilot. For tonight, I’m pouring a small glass of whiskey and going to bed though ooh I might need to order me that, that would come in handy. if you have a link handy i’d appreciate it but no biggie if you don’t. And cheers to that, nice way to end the night 👍
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