choke problem

GoldenMotor.com

tredye

New Member
Feb 1, 2011
19
0
0
norfolk va
i have a 48cc grubee engine with maybe a hour on it ,but i have to constintly adjust the choke lever on the handle bar to keeep up speed and when i let off the gas i have to push the choke fully open to keep it running or it will die ,what can i adjust to help this issue thanks
 

rustycase

Gutter Rider
May 26, 2011
2,746
5
0
Left coast
NOT a choke problem !

Apparently the choke works dandy! :)

Probably a major intake leak at carb to manifold, or manifold to cylinder.
Next is carb adjustments... read those threads. :)
Third probability is crud and gunk in the NEW tank getting into carb.
..clean it out real well, clean out carb well, install fuel filter inline and THEN try the carb adjustments.

Good luck
rc
 

tredye

New Member
Feb 1, 2011
19
0
0
norfolk va
i have adjusted the carb and do have a fuel filter manifold is tight and so is the card but half to keep working the choke to get it to smooth out to get top end and then when i slow down and pull in the clutch to stop with the choke set at the point the engine smooths out to get top end it cuts off and i have to move the choke again to get it to start again
 

GearNut

Active Member
Aug 19, 2009
5,104
11
38
San Diego, Kaliforgnia
All the choke does is add more fuel. You are manipulating the choke to act as a work around for another issue. The most common issue is an air leak.
It could be...
1. Where the carb attaches to the manifold.
2. Where the manifold attaches to the cylinder.
3. A crankshaft seal leak.

It also could be that the carb needs tuning which could involve re-jetting it.
Which carb did your kit come with? There are many different ones possible, depending on which factory made it and what day of the week that factory bought 10,000 carbs from some random carb factory that had the cheapest bid at the moment.
 

biknut

Well-Known Member
Sep 28, 2010
6,628
402
83
Dallas
The problem is you got a CNS carb. Throw in in the trash, and buy a NT for your bike and it will run fine.
 

JonnyR

New Member
May 13, 2012
1,203
1
0
37
ronkonkoma, new york
the NT carb is the best stock carb for these engines if you want to do performance upgrades the RT carb from dax or a mikuni carb would be your best options the CNS V3 EPA carb is a pain and somewhat useless