Portals will lose your top end speed as they are a geared down device, but your bigger wheels will pick up some of that loss, I'm not doing the math to work it out! Your speedo will be off due to the portals and wheel size, so if you'd added 30% portals and kept the standard wheels you would be moving along the road at 30% less speed for the same revs? but your bigger wheels will negate some of that effect. But with the loss of top end you should gain bottom end from the portals, and you should have good rock crawling, so are you saying that you've lost that too? I think any brand sheave mod for more bottom end would help you plus a slugged clutch seems to be common (I don't have either).
Sent from the bottom of ANOTHER empty whiskey bottle.
Chookbanger Mark II,
Street legal Blue Viking, 2017 model, bought 3/4/2017.
Street legal Blue Viking, 2014 model bought 3/4/2014, sold 3/4/2017 with 2850 km and 189 Hrs.
Yamaha Saggy Bottom Club member.
Other Yamaha Bikes Currently Owned
2016 YZ85 (sold)
2017 Grizzly 350 4x2 Auto Quad
Honda 2012 CB250
Honda 1999 CT200
Honda 1985 CT200 Trike