revs struggle at 4000rpm

[Guest]

hi my revs struggle about 4000 revs then it clears and climbs on ok it a gn125, it a new carb but choke cuts the engine out when cold starting ??

[tony-1977]

Sounds like it's running too rich. The choke should allow the engine to idle (fast, though), whilst cold. If it cuts out, then it's flooding.

[Petarded]

Yeah you could adjust the choke cable. If that doesn't fix it I had a similar issue (weak RPMs) with my 250 ninja and it turns out the cams were out of balance or something.

[JoshTimmins]

i have a similar issue on my gpz500s.

at 4000revs its like it dies, but it hits maybe 4300 and then its ok :/ noticed it the other day, other than that bike is fine, starts fine.

if i remember only rly does it in 2nd gear too.. but that could just be me lol.

Josh

[Guest]

i get what you mean about fuel mix being too rich but shouldnt a new carb be factory set ??

[Gamer]

it is only carbs setting

every engine wears out different as so carb need to be adjusted for this engine only - new carb old engine do the maths - factory setting will work with new engine

wrong carb setting and choke will not work as revs too