air filter, carb settings and rear sprocket idea

[mccraith100]

what air filter is best recommending for a 125cc. How do i set up my carb on my 125cc. si the suzuki rg125 gamma compaterable with a rg/rgv250.i want to get a smaller sproket for the rear so my bike will go faster at low revs. would it work or will it have side affects on the bike. cheers mike. ( my bike is an suzuki rg125 gamma)

[djbadger]

Hiya!

You ought to try and get a copy of the factory manual for the bike (if the bike has the factory standard carburretor) so you can have the official settings for the air/fuel mixture screws, etc. Then you could extrapolate from there. More fuel, burn richer - More air, burn leaner.
The main reason I say that is because I have had an experience with a friends bike (Jap Import Suzuki 400) on which the carb screws were all backwards to the british versions. The screws worked in reverse!

As far as air filters go, im sure practically anybody would recommend K&N after market filters. They make filters to fit every type of bike so you shouldnt have any trouble finding one that will work on your wee beastie.

Smaller sprockets are okay, but dont stray to far from the amount of teeth you have already or you will put too much strain on the engine, and the bike will struggle to pull away in lower gears. But im sure you knew that anyways! :) OH dont forget to get yourself a more heavy duty chain to go with it....

Umm, I hope that should help a bit.

[FUBAR]

Hello there m8

First off a good choice as Djbadger said is a K&N free flow airfliter or a cheap n nasty S&B will do the job equaly as good but the S&B dont like getting wet so might be better to go for more expensive K&N

If u do go for one of these airfilters is gona more than likely knock ur mixture out alot ... so u will possible have to uprate ur mainjet ( mainjet is basicly a nut with a hole in that regulates the amount of fuel that gets sucked thought it before it pass's into the airflow ..)
Reason ull need to do this is because with a replacement airfilter ull be sucking more air which means ull need more fuel to add to this air otherwise u risk running it so lean ull be turning ur engine into a welding torch ... see the more air u add the hotter the burn ...

I usually start from about 2-3 sizes up from standard clean ur plug go out for a quick ride give it a kaneing then check the spark plug for colour discolouration check ur haynes manual which shows u what type u are trying to achieve .. should have a nice brown tan ..

dont mess with ur mixture screw .. i dont know how many ppl think this is a way to tune it.. but the mixture screw is for idle mixture tuning only..
the main jet takes over from the idle jet at about 3k rpm, so messing with the mixture screw is totaly pointless ... the main jet and needle jet do all the work there after,..

unless u only ride it between 1,250 and 3,000 rpm

:idea: oh and about the sprockets why change the back? why not add a tooth to the front? alot cheaper ..:S which means u can aford to experiment alot more ..

good luck ...