i have a 2000 yz125 and was wondering if anyone has had varner motorsports mods to their bike. For all the mods it would cost around $1000. here is what they say on fmf's website FMF Engine Modifications:
The stock engine is a great performer so special attention by Terry Varner to focus on improving the overall power output. The transfer ports are modified and the cylinder head is machined to alter the compression boosting the already strong power delivery, and pumping up the peak horsepower to make the YZ an excellent all around performer. The carburetor is highly recommended to be bored for outdoor use on 2000 model, extending the YZ lethal power to extend further into the RPM range, and increasing it over rev ability. Motor modifications are complimented with the use of the AOF Ignition to maximize the gains associated with port timing alterations and increased compression.
The stock engine is a great performer so special attention by Terry Varner to focus on improving the overall power output. The transfer ports are modified and the cylinder head is machined to alter the compression boosting the already strong power delivery, and pumping up the peak horsepower to make the YZ an excellent all around performer. The carburetor is highly recommended to be bored for outdoor use on 2000 model, extending the YZ lethal power to extend further into the RPM range, and increasing it over rev ability. Motor modifications are complimented with the use of the AOF Ignition to maximize the gains associated with port timing alterations and increased compression.