Port and Polish - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 12-03-2017, 10:41 AM Thread Starter
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Port and Polish

Ive seen many people do port and polish jobs on the cylinder heads of larger v8 engines with huge power gains, i was wondering if it was possible to do on my 86 vn750 and how much power i would gain. Has anyone ever done this before?
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post #2 of 4 (permalink) Old 12-03-2017, 11:49 AM
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I've this to two stroke engines. Not sure you'd get "huge" power gains on the Vulcan however. Unless you also go with a less restrictive intake, a different exhaust, and a change in jetting, it be a waste of time. The increase would be more do to those three than polishing anything.

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post #3 of 4 (permalink) Old 12-03-2017, 04:34 PM
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Quote:
Originally Posted by Connor Lynden View Post
Ive seen many people do port and polish jobs on the cylinder heads of larger v8 engines with huge power gains, i was wondering if it was possible to do on my 86 vn750 and how much power i would gain. Has anyone ever done this before?
could also make it flow less by making it less turbulent

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post #4 of 4 (permalink) Old 05-28-2018, 12:49 PM
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Without opening up the carbs and getting rid of those horrible exhaust manifolds... it's not much use. Of course, a good multi-angle valve job and some bowl work can't hurt.

The engine has a lot of potential, but it would take a LOT of custom parts to really make it a screamer. Plus, the front exhaust runs right into the frame... hence the need for that inefficient manifold up front. Works fine for a cruiser, but would need dealt with if you wanted to make major power.

These bikes are built as cruisers, and are best left mostly stock... outside of a few minor upgrades.

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