Tav40 not working

[OPmini]

where can i get the parts for a Lifan 420? Not mentioning the fact that I live in Poland and getting these parts would be that more difficult.

either one of these places:
Pauls Karts
ARC Racing
GoPowerSports.com is your one stop shop for go-kart and mini bike parts.
If you need any help with deciding what parts you want you can always call either one of the above websites.

 

[BMPoland1993]

@OPmini thank you! If you could give me a quick list of the parts I would need after removing the governor I would really appreciate it.

 

[OPmini]

billet con rod
billet flywheel
50lbs valve springs
your also gonna need some valve grinding compound, a valve compressor, torque wrench, some taps and bolts to plug the governor hole, plastigauge, feeler gauge, and a throttle setup if you are running a stock carb. Here's a helpful video: 30Hp 40Ft-Lbs Of Torque!!! Duromax 440cc Stage 4 Engine Build - YouTube

 

[BMPoland1993]

@OPmini thanks for the input. I also need to know what size (thread dimension etc) are the standard carb jets in a Lifan 420cc engine?

Thanks!

 

[OPmini]

@OPmini thanks for the input. I also need to know what size (thread dimension etc) are the standard carb jets in a Lifan 420cc engine?

Thanks!

No idea, these jets should work tho: Amazon.com : OMB Warehouse Jet Kit for GX340 GX390 and Predator 420cc : Garden & Outdoor

 

[BMPoland1993]

OK, so I got some stock jets here in Poland, left them at a CNC workshop and had one drilled out to 1mm, which is 0.0393700787 inches. On my 420cc with an air filter adapter and filter the engine still stalls when adding gas at idle. Any ideas?

 

[OPmini]

OK, so I got some stock jets here in Poland, left them at a CNC workshop and had one drilled out to 1mm, which is 0.0393700787 inches. On my 420cc with an air filter adapter and filter the engine still stalls when adding gas at idle. Any ideas?

You must be running too rich try a smaller jet

 

[BMPoland1993]

You must be running too rich try a smaller jet

Engine stalls with a smaller jet too.

 

[OPmini]

Engine stalls with a smaller jet too.

There are multiple jet size calculators that use info like your altitude to calculate the best jet size, you may want to them check out. If that doesnt work and you just want this fixed bring it to a local powersports dealer or small engine repair shop and explain your problem with the jets.