Register FAQ Community Calendar Today's Posts Search
Go Back   ScootDawg Forums > Performance :: Maintenance :: Technical > 50cc - 124cc
Reply
 
Thread Tools Search this Thread Display Modes
Old 01-24-2013, 08:06 PM   #1
94fordman   94fordman is offline
 
Join Date: Dec 2012
Location: tampa fl
Posts: 8
scooter shuts off at high speed

was riding to work today and was at high speed and scoot shuts off and slows down then runs fine have a 50cc jonway 20 mm carb with 6hix plug insted of 7hix woundering if thats the prob



Login or Register to Remove Ads
  Reply With Quote
Old 01-24-2013, 08:11 PM   #2
beachbum   beachbum is offline
 
Join Date: Nov 2011
Location: Socal
Posts: 31
Does it bog and then when you let off the throttle does it pick up again?

Does it do it right away when you hit high speeds or does it do it after you've been at high speeds for a while?
__________________
2010 Honda 110
2011 SSR Verona 150
1978 Motobecane 49cc

Last edited by beachbum; 01-24-2013 at 08:30 PM.
  Reply With Quote
Old 01-24-2013, 08:27 PM   #3
94fordman   94fordman is offline
 
Join Date: Dec 2012
Location: tampa fl
Posts: 8
every so often it does this just as ur riding at high speed then it bogs slows then u can speed up again



Login or Register to Remove Ads
  Reply With Quote
Old 01-24-2013, 08:47 PM   #4
qwertydude   qwertydude is offline
 
Join Date: Jan 2010
Posts: 139
Likely the larger carb is reducing vacuum to the petcock and shutting fuel flow off. To help maintain vacuum to the petcock you can do a few things, completely remove the smog system and block off the exhaust PAIR vent. This also greatly simplifies hose routing. Then run the vacuum line direct from the intake manifold to the petcock, when you remove the smog system this makes it a direct run with no T's which can reduce vacuum to the petcock.

You might need to switch to a manual petcock.
  Reply With Quote
Old 01-24-2013, 09:10 PM   #5
beachbum   beachbum is offline
 
Join Date: Nov 2011
Location: Socal
Posts: 31
I was having a fuel flow problem on my 150cc at long durations of high speeds, but I haven't heard of this happening to a 50cc. It does seem like that is what your dealing with. You can try what Qwertydude suggested or get a high flow fuel pump.

Just curious, did you perhaps overfill your tank just before this happened? Sometimes if the fuel tank vent gets filled with gas you'll run into the same problem.
__________________
2010 Honda 110
2011 SSR Verona 150
1978 Motobecane 49cc



Login or Register to Remove Ads
  Reply With Quote
Old 01-26-2013, 05:41 PM   #6
94fordman   94fordman is offline
 
Join Date: Dec 2012
Location: tampa fl
Posts: 8
tank wasent completly full. theres a line going to petcock frome intake then to carb
  Reply With Quote
Old 01-26-2013, 08:56 PM   #7
qwertydude   qwertydude is offline
 
Join Date: Jan 2010
Posts: 139
On a proper running system the tank not being full shouldn't have an effect. You should be able to run all the way to last drop. I still think it's reduced vacuum from the larger carb. When people install a larger carb they almost always also install a performance intake. Both those can reduce intake vacuum to the point where the petcock isn't working. You can also try running a manual petcock.
  Reply With Quote
Old 01-26-2013, 09:16 PM   #8
savy09   savy09 is offline
 
savy09's Avatar
 
Join Date: Aug 2009
Location: BOCA RATON, FL
Posts: 51
Yeah, the over fill hose may have a bit of gas(vapor) locked in it, disconnect it from the tank end and petcock, blow air in to clear it and re attach... also may be building up vapor in tank running full, then crack open the filler cap to free vapor, ck you may have to drill a small hole in the cap. Also ck your intake manifold, T hoses, and to the petcock for blockage blow them out.
  Reply With Quote
Old 01-26-2013, 09:35 PM   #9
Lefty   Lefty is offline
 
Lefty's Avatar
 
Join Date: Jan 2013
Location: midwest
Posts: 93
First thing I woud do is change out the Plug get a 7 the 6 is to HOT of a plug and try that.
Lefty
__________________

Three Wheels keep me up
You’ll never be old and wise if you weren’t young and crazy
  Reply With Quote
Old 01-27-2013, 11:30 AM   #10
94fordman   94fordman is offline
 
Join Date: Dec 2012
Location: tampa fl
Posts: 8
k cool will try
  Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:12 PM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.