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New to me 2014 Buddy 125....some issues with throttle...help

 
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Buddy_SF_Rider
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Joined: 11 Jan 2019
Posts: 6
Location: San Francisco
Buddy 125

PostPosted: Mon Feb 18, 2019 5:31 pm    Post subject: New to me 2014 Buddy 125....some issues with throttle...help Reply with quote

I have just recently purchased a Buddy 125 from someone who was just letting it sit in their garage.

I have already changed the oil, added new fuel (about 1/8th of a tank of old gas), fuel filter, cleaned the carb and jets.

The issue that I am running into is that I will slightly twist the throttle, it will rev slightly and then about 2-3 seconds later it just opens up.

I can't figure out why this is happening, any advice?

Thanks!
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fried okra
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Joined: 05 Dec 2018
Posts: 59
Location: Charleston
Scarabeo

PostPosted: Mon Feb 18, 2019 7:26 pm    Post subject: Reply with quote

By "just opens up", you are saying the scooter starts to accelerate?

Or maybe the engine starts to stall out?

fried okra
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JettaKnight
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Joined: 29 Mar 2007
Posts: 538
Location: Fort Wayne
Series Italia 161

PostPosted: Mon Feb 18, 2019 7:45 pm    Post subject: Reply with quote

Only you, the rider, can "open up" the throttle in the carburetor by twisting the handle.

Perhaps you can explain the phenomenon without the jargon, since we're a bit confused.
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charlie55
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Joined: 08 Apr 2008
Posts: 1912
Location: New Jersey
'06 Blur (Sold) '05 Honda Helix (Sold) '76 CB125S (Sold) '06 Honda Helix

PostPosted: Mon Feb 18, 2019 9:40 pm    Post subject: Reply with quote

I believe the OP is trying to say that there's a delay in the throttle response, i.e., hesitation.
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babblefish
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Joined: 04 Dec 2007
Posts: 2870
Location: San Francisco
2006 Blur 180, 2008 Buddy St. Tropez

PostPosted: Tue Feb 19, 2019 6:55 am    Post subject: Reply with quote

When you say it "opens up", are you saying that it goes to full throttle with just a small amount of throttle input?
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tenders
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Joined: 03 Dec 2018
Posts: 88

Buddy International 50 Italia

PostPosted: Tue Feb 19, 2019 4:09 pm    Post subject: Reply with quote

The simplest explanation for hesitation like you’re describing, given the situation, is ongoing schmutz in the carb - suggest taking it apart again and recleaning the jets.

It can also be a result of bad gas, which seems pretty likely to me as the addition of 7/8 of a tank of good gas to 1/8 of a tank of bad gas really creates 8/8 of a tank of mediocre gas. I would suggest draining the tank completely and replacing it with high octane fresh gas simply to rule out this potential cause. (I’ve also found that too much Seafoam causes hesitation, but that was in a 2T engine.)

It could also be a little air leak in the carb, so be very careful that you get the gaskets in place and seated tightly when you reassemble it. You might check the assembly of the other side of the carb too (the top half as it sits when installed).

Other possibilities easily investigated and ruled out: fouled plug, or loose connection from the plug boot onto the plug. The engine could also hesitate when it’s cold out, which might not really be worth futzing with.
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fried okra
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Joined: 05 Dec 2018
Posts: 59
Location: Charleston
Scarabeo

PostPosted: Tue Feb 19, 2019 4:26 pm    Post subject: Reply with quote

Possibly the accelerator pump diaphragm is not seated well now after the carb was taken apart.

Or the diaphragm could have gotten punctured during the carb cleaning process.

fried okra
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Buddy_SF_Rider
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Joined: 11 Jan 2019
Posts: 6
Location: San Francisco
Buddy 125

PostPosted: Wed Feb 20, 2019 1:25 am    Post subject: Reply with quote

Thanks for the suggestions everyone. I'll take apart the carb again and try to clean everything again.

I'm not sure if this video will help out any.

https://vimeo.com/user95268883/review/318344045/b12f6b3dda
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JettaKnight
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Joined: 29 Mar 2007
Posts: 538
Location: Fort Wayne
Series Italia 161

PostPosted: Wed Feb 20, 2019 9:02 pm    Post subject: Reply with quote

Buddy_SF_Rider wrote:
Thanks for the suggestions everyone. I'll take apart the carb again and try to clean everything again.

I'm not sure if this video will help out any.

https://vimeo.com/user95268883/review/318344045/b12f6b3dda


Sad No video.
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Buddy_SF_Rider
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Joined: 11 Jan 2019
Posts: 6
Location: San Francisco
Buddy 125

PostPosted: Thu Feb 21, 2019 12:29 am    Post subject: Reply with quote

JettaKnight- really? I clicked on the link and it worked. It's just a 4-5 second video clip.
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tenders
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Joined: 03 Dec 2018
Posts: 88

Buddy International 50 Italia

PostPosted: Thu Feb 21, 2019 12:44 am    Post subject: Reply with quote

Really.

“Sorry, we couldn’t find that page. Make sure you’ve typed the URL correctly, or try searching Vimeo. You could also watch one of the videos below instead.”

Maybe it isn’t available for public viewing? Care to suggest a search term?
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Buddy_SF_Rider
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Joined: 11 Jan 2019
Posts: 6
Location: San Francisco
Buddy 125

PostPosted: Thu Feb 21, 2019 1:06 am    Post subject: Reply with quote

Sorry about that.

I hope this works:

https://vimeo.com/318344045
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Stanza
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Joined: 29 Jan 2018
Posts: 375
Location: Chicago
Puch Maxi, Honda C70

PostPosted: Thu Feb 21, 2019 2:25 pm    Post subject: Reply with quote

Yep, that sounds like a leaky diaphragm seal. Try greasing the bead where it's supposed to be sealing, and inspect the diaphragm for cracks/tears.
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Buddy_SF_Rider
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Joined: 11 Jan 2019
Posts: 6
Location: San Francisco
Buddy 125

PostPosted: Mon Feb 25, 2019 7:38 pm    Post subject: Reply with quote

Update:

No tear or cracks in the diaphragm, although it may not have been seated correctly.

Cleaned the rest of the carb and it fired up and is running smooth now.

Not exactly sure what happened, but its all good now.

Thanks to everyone for their suggestions. This is definitely a new learning process, but i'm enjoying every part of it.
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