This is a tricky call to make. I will agree 95% with GX 150 , but it will depend on your gearing, sprocket size and tire size. I have always found the 18grm rollers might effect top speed by 1 MPH but the low end and mid range will be much better. Not knowing what year HH you have for the later models have the HI/LOW gear box so gearing will be differant than the older single range gear box. Either way you will improve performance overall with 18 grm rollers and torque spring change. You will also want to change your clutch springs as well. Most will experiment with a few differant wieght rollers to achieve their desired performance.
TOM
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