Hi, I just fitted a new Doppler S3R exhaust to my stock Aerox YQ50 08.

The problem is that the bike will either take off very quickly and reach 55mph+ or just bog down, go very slow and not reach speeds above 30mph.

I can be going fast and it will suddenly slow down.

Do I need a new air filter? re-jet? lighter rollers?

Please help

Thanks

When putting on a sports pipe your best option is to change the rollers to lighter to keep the bike running smooth. i had a viper pipe on mine and had 4 gram rollers in it and it was running sweet, but then i experimented putting 6 gram rollers in for top end but then it started bogging like yours. another thing it is reccomended that you up-jet 5-10 sizes.

yeh and if you do all of the above you might as well get an aftermarket filter and go 20sizes up on the jets that way you get the most out of the upgrade also i would get a selection of jets from 10 sizes biger to 25 sizes biger

OMG i thought it was only my ped that does that lol mine does the exactly the same i hate it, my ped is fuckin quick when it runs