trx90 upgrade

[mutmut]

I have a 2003 trx90 and I need a little more power as my son is getting a bit big for it but not quite ready for a big atv. He does not race or anything. Just looking for some reasonabe upgrades to tide him over. Or should I save my money and wait?? Thanks!!!

[212racing]

have you removed the 4th gear speed limiter?
you can run an aftermarket air filter

[Quadtime]

I have a used big gun pipe for a trx 90. Good shape $125.00
Add pipe and take the air box cover off. Major difference.

[212racing]

simply go with a thinner head gasket, raises comp. ratio. also
install 5degree advance timing key.what type of riding do you do?
tight trails and woods riding, put a 52 sprocket on the back for
more grunt.

[250rider1]

where could i get a thinner head gasket

[ROBBSRACING]

We have the head gaskets as well as a bunch of other fairly inexpensive mods for the TRX 90. The 5 degee key is an option. Its not my first choice however. I have found that a performance CDI box works ALOT better and really isnt much more money. It is also easier to install.

[250rider1]

have u built many 90's for woods racing or is it mostly mx?

[ROBBSRACING]

Most of the TRX90s we build are for MX. There would be no problem in changing the build to make an XC engine.