On my Hawk, and TBR7,I installed PVC preload spacers, and replaced the fork oil with 20 weight. I also put fork braces on both, as well as an adjustable rear shock on the Hawk, the TBR7 already had one. I still have the Hawk, and I am pleased with the suspension. I bought these bottles of oil, and put exactly half a bottle in each fork. The price has increased a little ($1.50 increase), but still not bad concidering the miles it will see.
https://www.amazon.com/gp/aw/d/B0022...?ie=UTF8&psc=1