wher can i get some help tuning my suzuki rg 125 es 2 stroke lc bike?

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i am having trouble with carb settings. the carb had a 185 main jet when i got the bike. and ran fine through gears 1-4 upto 75-80 mph.
but as i went through the gears i noticed the peak revs were getting lower in each gear. so gears 1 and 2 rev out at 12000 rpm 3 at 11 then 4 at10 and gears 5 and 6 wont rev past 9000 rpm. ive tried increasing the main jet size, but it is still the same! im confused.com...lol
any ideas would be grateful received..regards steve..
WITH THE THROTTLE PINNED WIDE OPEN IN EVERY GEAR!!!!
my 125 engine was faster! lol
i put in the title its a 125! it has a 150 engine fittet from thailand and they should be good for 180 kmh or 111 mph whichever you prefer?
 
wind resistance will slow you down..power band only runs to 10,000rpm

try on a long down hill section of road with a tail wind..

top speed on 125cc 2 stroke should be around the 80MPH..

although the GP bikes manage 130 MPH

this site has the specs & an magazine clip..that says 85MPH if your lucky..
http://www.motorcyclespecs.co.za/model/suzu/suzuki_rg125f_91.htm
 
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