can't rev fast

Suzuki_MX · #1 (**permalink**) 05-07-2007, 02:50 AM

I got a problem if I try and rev my bike fast like a quick blip it bogs down and sounds like it wants to cut out. I played with the air screw to try and fix it but didn't work. any suggestions?

Suzuki_MX · #2 (**permalink**) 05-07-2007, 03:41 AM

someone must know.

Ruby · #3 (**permalink**) 05-07-2007, 03:47 AM

More info.

What bike you riding? Size engine? Size carby? Did you recently replace carby? Is it a new bike or used and abused?

It could be one of a hundred things. A bit more info will help narrow it down.

Suzuki_MX · #4 (**permalink**) 05-07-2007, 05:50 AM

its a lifan 125cc and a 25mm carb.

cass38a · #5 (**permalink**) 05-07-2007, 06:52 AM

I had the same problem on my Lifan (just about everybody has or had that flat spot). I changed my main jet (mikuni carb) to a 102.5 and adjisted the E clip and adjusted the air screw (basic carby tuning) and it fixed it.

jayde156 · #6 (**permalink**) 05-07-2007, 07:12 AM

jetting... for asure go a 102.5 main jet or something

lachie · #7 (**permalink**) 05-07-2007, 11:53 PM

how do you change your "main jet" to 102.5

KTMKID · #8 (**permalink**) 06-07-2007, 12:16 AM

you have to buy the jets from a local bike shop...

cass38a · #9 (**permalink**) 06-07-2007, 03:39 AM

Do a search on "flat spot" or "main jet" and you should find your answer.

can't rev fast

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