Originally Posted by Runningon3
Yes you can bore the 750 to an 800,but the better way is to use 1994 or 1995 800 cylinders. The 800 cylinders have a thicker sleeve, and the 750 sleeve would be very thin when bored. The 750 has a smaller skirt on the reed valve side than the 800 and it would break off after boring to the 800 size. You can use the same carbs, reeds and pipes after rejetting. Newer 800 cylinders are chrome bores. If you have the updated jetting for the 750 and you keep the clutching under 8150 RPM, You should see 118 MPH on Radar. You would also get about 20 % better fuel mileage than a 800. You can change the stock can on the storms for an aftermarket to get more power at a higher RPM, but the con rod bearings can fail and take out the crank and cases. I would not use premix as oil is fed to the PTO bearings by a extra line and the outer bearing would fail. I hope this helps answer your questions!
The 750 Storm has very thick sleeves and has plenty of meat left after boring to 800. This is a very common and accepted modification. I have bored many 750 Storms to 800 here in Michigan and have never had a broken sleeve. You can even bore them .040 past an 800 bore and have no problems.
An aftermarket "can" will produce little if any more power than the stock silencer and will certainly NOT cause rod bearing failure.
No Storm ever had direct PTO oiling.
Where are you getting your information?