I understand what rarerat is saying and have to agree. My Joyner 650 has 25" mudlites and no problem but when I run the 27" Duro Strikers which are much less agressive it killed the performance so much that hills I was once able to climb I now can't even when I tried to dump or slip the clutch it just run out of power going up just as if I were starting out in 2nd gear.
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