has anyone replaced the final drive for a 6th gear? - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #11 of 20 (permalink) Old 06-10-2018, 01:19 PM
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all valid points, appreciate it, my bike goes 110, but it feels like its to much. thats why i wanted to add the gear. since its pretty much impossible, i'll be happy with what i got
If you spend much time over 100 you should have noticed the need for a larger gas tank. That mod has been done and is, in my mind, a great way to improve these bikes. Without more fuel capacity you can only go about 80 - 90 miles before you are out of gas. Enlarging the tank would be a easier job than adding a gear.

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post #12 of 20 (permalink) Old 06-10-2018, 02:06 PM
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Changing the primary drive or final drive ratio would be easier.
There is a 2.454 listed in the specs vs the 2.522 US/Can model.

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post #13 of 20 (permalink) Old 06-10-2018, 08:59 PM
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I have a 6th gear, but I had to think outside the box to get it, lol.

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post #14 of 20 (permalink) Old 03-23-2019, 04:46 PM
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Originally Posted by DenverDiesel View Post
Changing the primary drive or final drive ratio would be easier.
There is a 2.454 listed in the specs vs the 2.522 US/Can model.
where do i find the parts for that? Does the drive ratio change for different model years? what i'd really like is to make 5th gear a little higher, mostly just for highway cruising/MPG, but if i have to change the ratio overall, i'm game.

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post #15 of 20 (permalink) Old 03-23-2019, 06:23 PM
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european models had a different ratio. ebay from europe probably best way, but your gonna pay thru the nose for shipping a rear end
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post #16 of 20 (permalink) Old 03-24-2019, 09:28 AM
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It's such a minor change in ratio, you're not going to see much change in rpm or mpg.
.

The VN750 loves to rev, highway speeds don't hurt it at all.
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post #17 of 20 (permalink) Old 03-27-2019, 04:16 PM
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Quote:
Originally Posted by DenverDiesel View Post
Changing the primary drive or final drive ratio would be easier.
There is a 2.454 listed in the specs vs the 2.522 US/Can model.
This will drop your RPMs by 2.7%.
Going to a 170/90 rear tire will drop your RPMs by 5.2%.
Together, you can drop RPMs by about 7.7%.

So (if memory serves me), my bike (stock) does 5,000 RPM at 80 MPH.
Changing the ratio and the tire only gets you to 4,600 RPM!

Of course, you can go with an undersized the front tire to increase the indicated speed.
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'89 Vulcan 750 Purchased 4/12/18 @ 17805.9 miles $800
Purchased stock except for K&N Filters. Wrecked once
20969.2 miles & counting

Completed modifications:
Removed mufflers, running straight out of goats belly
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages

Planned modifications:
Ear Shave (without coasters)
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
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post #18 of 20 (permalink) Old 04-20-2019, 06:46 PM
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I donít care about 6th, but Iíd love an overdrive. The bike cruises so well at 65-70, but I donít care for high rpm on long freeway travels. Iíd like to drop it down to cruising rpm on the freeway. If it were a chain or belt drive it would be easy, but as it is you gotta take or or leave it. My very first post here was bitchin about rpm on top end......... and it'll be my last one day. Lol.

Iíve built so many VNís Iíve grown accustomed to them and their quirks..... and they have lots. Itís hard to get around the comfort of one though. Heavier bikes can manage to be comfortable with space and weight, but the VN does it by sheer design. The last notch in that comfort is the ability to cruise in 5th at a lower rpm and thatís the real reason it bugs so many people.


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post #19 of 20 (permalink) Old 04-23-2019, 11:23 AM
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I can't even hear the engine at freeway speeds, and it's several thousand rpm below redline. The Vulcan has a VERY short stroke engine, which allows it to turn very fast without overstressing it. It's not like any other cruiser engine I know of, except for the Vulcan 500. That engine came out of a sportbike. I heard that the Vulcan 750 engine was originally designed for a sportbike. It appears to have been modified in several different ways. I think it was originally designed for chain drive. I also think the hydraulic valves were an afterthought, because you can't get the cam covers off in the Vulcan frame. Then there is that convoluted intake system, and the fact that you can't get the stator cover off without pulling the engine. It appears to have been pieced together by several different people out of bits and pieces. IMO the engine is not ideal for a cruiser, it has the wrong powerband and makes the wrong sounds. There is almost no vibration. But all that makes for a great long distance touring bike.

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post #20 of 20 (permalink) Old 04-23-2019, 12:51 PM
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Quote:
Originally Posted by VN750Rider/Jerry View Post
I can't even hear the engine at freeway speeds
Sounds like you need a louder exhaust! 🙂


'89 Vulcan 750 Purchased 4/12/18 @ 17805.9 miles $800
Purchased stock except for K&N Filters. Wrecked once
20969.2 miles & counting

Completed modifications:
Removed mufflers, running straight out of goats belly
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages

Planned modifications:
Ear Shave (without coasters)
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
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