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Old 02-18-2008, 09:38 PM   #1 (permalink)
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750 Indy Storm

Have a 93 Indy storm 750 ... Looking at the thread about boring it out to the 800. Was wondering if the carbs and the reeds of the 750 can be replaced with the reeds and carb from the 800. Also i was thinking of removing the oil injector and just mixing the gas ? Any thoughts....
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Old 02-26-2008, 08:15 PM   #2 (permalink)
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750 storm

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!
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Old 02-26-2008, 11:57 PM   #3 (permalink)
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Quote:
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?
Jerry
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Old 02-27-2008, 08:01 PM   #4 (permalink)
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Oops, I guess I didn't give enough info. I should have said the storm large end con rod bearing will not live at high RPM. The cans or aftermarket pipes make more power at a higher RPM. After a while most storm engines die a nasty death. I still have a case that the clutch cylinder rod bearing failed and the rod came out through the case at 9500 Rpm. The engine still ran home on Two. I still have a stock 750 with 8500 miles that has never been opened up. If you want more power it's best to go bigger, but keep the RPM close to stock. The motor will live longer. It's the reason why Polaris put a rev limiter on the XCR 800 motors. Yes, we have bored 750 to 800's but I still think it better to start with a 800 and bore it bigger.
I stand corrected about the 750's all having the direct oil injection to the PTO. My 750 is stamped 92-00008 and it has it. My other case does not have it and it's stamped 92-00140. All the 800 storm cases are the same as the later 750's with a drilled passage to the bearing.
Jerry seems to know his storms. Does anyone know why the 750 updated jetting specs are so different from the 800?
Kevin
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