bogging at full revs

my 2011 aerox bogs out when i sit at high revs for about 1 minute, all powers lost just makes that 'air sucking in' noise (if anyone gets what i mean)? when i stop turn the engine off and restart it goes fine until i full rev it. any suggestions on what to check/ how to fix ect?

thanks

 

up jet it

 

thanks for the quick reply. and i have the jets shall i try going up to the next size? also shall i clean my airbox + carb out aswell?

 

yeah givw it all a clean out and up jet and if it still dose it take the plug out after its done it and see if its wet or dry

 

thank you ill give it a go and get back to you!

 

actually before up jeting it take it for a run let it do it then check the plug to see if its wet or dry

 

okay if its dry its fine right? if its wet its too rich right?

 

if it dry try up jetting a little bit like a size or 2 and if its wet down jet it a little

 

ok the end of my spark plug is a light grey that means its running lean?

 

soz for late reply went for a blast on my bike but yes its lean so up jet it a few sizes and see how it gose

 

just looked an my airbox wasnt fitted on the top connector had fell out of the top of the airbox, thought it had got louder recently, cleaning carb + airbox now see how it goes

 

that will be the problem for sure

 

ill up the jet and put it back togther then take it for a spin

 

still hasnt fixed it any other sugestions?

 

If you think about it logically: When you're at full throttle, you're using lots of fuel, air and generating heat. The first thing I'd check is that the fuel lines can provide enough supply to maintain the high usage (makes sense that it has time to refill if you aren't at full throttle or stop to let it refill).

Check the fuel vacuum tap and that the carb float can move freely. If you find no problem, give the air filter a good clean and try a cold/hot compression test (should be higher compression when hot)

 

how do i do a cold/hold compression test and check the fuel lines?
im no expert

 

had a similar issue with a zip 70 SP. It was the mixture!...bit of fine tuning with the screw soon sorted it out