Question about carb on 49cc Ghost Racer

Greg58

Well-Known Member
May 1, 2011
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That looks like the bowl vent, since it is near the top above the needle and seat. If it is just let it hang down, on some carbs if you plug it the bowl won’t fill.
 

Sgt. Howard

Active Member
Sep 28, 2010
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I am asking because my boy ran this motor when it was on another frame and it developed a vacuum leak or a clogged fuel situation afterwards that I cannot figure out- and I forgot how the tubes ran before.
 

Sgt. Howard

Active Member
Sep 28, 2010
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It does- I should point out that same son ran fuel/oil mix in it- SHOULDN'T cause any harm, but when it couldn't hold an idle without the choke on, I disassembled the carb and cleaned it- still won't run unless 1) choke was partially on, 2) idle set high enough for the centripetal to engage and at that- 3) the fool thing had little/no power.
 

Greg58

Well-Known Member
May 1, 2011
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It does sound like a air leak some where, I don’t know much about that engine, does it have adjustable valves? If so have you check the lash?
 

Venice Motor Bikes

Custom Builder / Dealer/Los Angeles
Mar 20, 2008
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The carbs on those engines are terrible!!
They get clogged & (I have found) them to be near impossible to get them to idle again!!!!

This is why so many switch to the NT 2-stroke carb & manifold.

Keep in mind that you'll have to drill the NT jet a little bigger for the 4-stroke engine.

Here's a link to the parts...
https://www.gasbike.net/collections/carburetors-air-filters/products/nt-carburetor
https://www.gasbike.net/collections...s/49cc-nt-carburetor-intake-for-4-stroke-long

Whenever I build a 49cc 4-stroke bike, these automatically go on it!!!!
 
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Sgt. Howard

Active Member
Sep 28, 2010
186
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Okanogan, WA
It does sound like that is the issue- but my luck with NT carbs is that I am constantly replacing the float due to leaks! And the CNC Carbs always break at the mount! Does ANYBODY make a decent carb that will work?
 

Sgt. Howard

Active Member
Sep 28, 2010
186
53
28
66
Okanogan, WA
The carbs on those engines are terrible!!
They get clogged & (I have found) them to be near impossible to get them to idle again!!!!

This is why so many switch to the NT 2-stroke carb & manifold.

Keep in mind that you'll have to drill the NT jet a little bigger for the 4-stroke engine.

Here's a link to the parts...
https://www.gasbike.net/collections/carburetors-air-filters/products/nt-carburetor
https://www.gasbike.net/collections...s/49cc-nt-carburetor-intake-for-4-stroke-long

Whenever I build a 49cc 4-stroke bike, these automatically go on it!!!!
??? How big do I drill the jet?